LG Flat TV 32LG40 Manual de Entrenamiento
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42LG60
LG TRAINING MANUALFall 2008 LCD Training
LG TRAINING MANUAL
32LG40
IMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring, and lead dress must conform to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it only with the factory specified fuse type and rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB. Always keep wires away from high voltage or high temperature parts. Do not attempt to modify this product in any way. Special components are also used to prevent shock and fire hazard and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines. Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.
ElECTROSTATICAllY SENSITIvE DEvICESSome semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on the body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as an ESD mat, to prevent electrostatic charge buildup or exposure of the assembly. Use only a grounded-tip soldering iron to solder or unsolder ES devices. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ES devices. Do not use refrigerant-propelled chemicals which can generate electrical charge sufficient to damage ES devices. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it.
REGUlATORY INFORMATIONThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or an experienced radio/TV technician for help. The responsible party for this devices compliance is: LG Electronics of Alabama, Inc. 201 James Record Road. Huntsville, AL 35813, USA. Digital TV Hotline: 1-800-243-0000
Published July 2008 by LG Electronics USA Training Center
Copyright 2008 LG Electronics of Alabama, Inc.
Contact Number Hours of Operation
Customer Service (800) 243-0000 24 hours a day / 7 days a week
Technical Support (800) 847-7597 7am-7pm Mon-Fri / Sat 8-2 CT
Parts Sales (888) 393-6484 7am-7pm Mon-Sat CT
Training Center (256) 774-4051 8am-5pm Mon-Fri CT
Web ContaCts:Web Site Address Description
LG USA www.lgusa.com Product information
Customer Service us.lgservice.com User manuals, FAQs
GCSC aic.lgservice.com Service manuals, parts, bulletins
Customer Service Academy www.lgcsacademy.com Web training, discussion forum
Live Training lge.webex.com Live training
Phone ContaCts:
Fall 2008 LCD Training 3
Table of ConTenTs
Overview .................................................. 5introduction ....................................................5Basic Troubleshooting Steps ............................5Caution............................................................5Model Number Structure ...............................6Serial number Structure ..................................6Features ..........................................................732LG40 Dimensions ........................................842LG60 Dimensions ........................................8remote Control ..............................................9New Features .................................................9Computer Connection ................................. 10Service Menu ................................................ 10Power Consumption .................................... 10Service remote ............................................ 11Check Firmware version ............................. 12Update Firmware ......................................... 12
DiSaSSeMBLy - 32LG40 ............................ 13Back Cover removal .................................... 13Board Layout ................................................ 13Power Supply removal ................................ 14Main Board removal .................................... 14LCD Driver removal ................................... 15Ballast removal ............................................ 16DvD Player removal ................................... 17DvD Player removal ................................... 17exploded view ............................................. 18
CirCUiT DeSCriPTiONS - 32LG40 ......... 19Power Supply (SMPS) ................................... 19Main (Digital) Board ..................................... 22Ballast assembly ........................................... 30LCD Driver (T-Con) .................................... 32DvD Player .................................................. 34Front Board .................................................. 35invisible Speaker System ............................. 37
DiSaSSeMBLy - 42LG60 ............................ 39introduction ................................................. 39back cover removal ..................................... 39Power Supply (SMPS) removal .................... 40Main Board removal .................................... 40control Board removal ................................ 41LCD Driver Board removal ......................... 41Speaker Box removal .................................. 42exploded view ............................................. 43
CirCUiT DeSCriPTiONS - 42LG60 ......... 45introduction ................................................. 45Backlight Layout ........................................... 46Power Supply Layout ................................... 47Control Board Layout .................................. 49LCD Driver (T-CON) Layout ...................... 51Main board layout ........................................ 53invisible Speaker SyStem Layout .................. 61
SCheMaTiCS ............................................ 6332LG40 :: interconnect ................................ 6332LG40 :: waveForms ................................. 6432LG40 :: Main Board :: Main Micro ............ 6532LG40 :: Main Board :: audio .................... 6632LG40 :: Main Board :: Memory ................ 6732LG40 :: Main Board :: BCM/USB .............. 6832LG40 :: Main Board :: DCM ..................... 6932LG40 :: Main Board :: LvDS/DvD ............ 7032LG40 :: Main Board :: Tuner Power ......... 7132LG40 :: Main Board :: Jackpacks ............... 7232LG40 :: Main Board :: hDMi .................... 7342LG60 :: interconnect ................................ 7442LG60 :: waveforms .................................. 7542LG60 :: Main Board :: BCM ..................... 7642LG60 :: Main Board :: DDr Memory ...... 7742LG60 :: Main Board :: Main Micro ........... 7842LG60 :: Main Board :: audio Processor .. 7942LG60 :: Main Board :: hDMi ................... 8042LG60 :: Main Board :: interface ............... 8142LG60 :: Main Board :: interface ............... 8242LG60 :: Main Board :: regulators ............ 8342LG60 :: Main Board :: LvDS/Tuner .......... 8442LG60 :: Main Board :: audio Out ............ 85
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OveRvIeW
OveRvIeW 2008 LCDSINTRODUCTION
The manual covers two models from the 2008 LCD product line. Each model is an HDTV with integrated HD tuner. The 32LG40 is a 720p/1080i model, the 42LG60 supports 1080p (Full HD). All models 32 and larger include USB Media Host and SimpLink. USB Media Host consists of a USB port on the back of the TV that supports USB flash memory drives loaded with media or firmware for the TV. SimpLink allows for control of other LG SimpLink products via the HDMI connection.
All LCD TV models are module level repair in and out of warranty. They are covered by a one year parts and labor warranty. Refer to the last page of the owners manual for more warranty information. For models under 30, the Sevice Level is Factory Service Repair. Larger models are Field Service. Contact the Warranty department for more information.
BASIC TROUBLeSHOOTING STePSDefine - Look at the symptom carefully and determine what circuits could be causing the
failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc. Observation of the front Power LED may give some clues.
Localize - After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.
Isolate - To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes glitches or road bumps will be an indication of an imminent failure.
Correct - The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.
CAUTION1) A 20 minute pre-run time is required before any adjustments are performed. 2) Refer to the Voltage Sticker on the Switch Mode Power Supply silk screening. (+/- 1/2
volt).
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OveRvIeW
MODeL NUMBeR STRUCTURe
4 2 L G 6 0 - U A
Screen Size
YearG = 2008 Series/Feature Level
30/31 = HDTV40 = DVD Player50 = Full HD60 = Scarlet - Full HD & 120Hz70 = Full HD & 120Hz90 = LED BacklightX = Super Thin
Display TypeP = PlasmaL = LCDD = DLP RPTVJ = Projector
BrandZ= ZenithBlank = LG
RegionU = North AmericaB = Europe & NA
Chassis Version
SeRIAL NUMBeR STRUCTURe
4 0 3 M X X Q 0 5 1 0 6
Sequential Number (5-7 Numbers)
Production Info (2 Letters)
Production Site (2 Letters)
Production Year and Month (3 Numbers). Ex, March 2004.
3) Be cautious of electric shock from the Backlight section, it uses high voltage AC. Check that the Power Supply and Drive Circuits are completely discharged because of residual current stored before circuit board removal.
4) C-MOS circuits are sensitive to static electricity. Use caution when dealing with these IC and circuits.
5) Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.
6) Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.
7) Check the appearance of the Replacement Panel and Circuit boards for both physical damage and part number accuracy. Verify model names and board model matches.
Fall 2008 LCD Training 7
OveRvIeWFeATUReS
Model Name 32LG40 47LG60Chassis Name LP81A LP81A
Screen Specs
Resolution 1366 x 768p 1920 x 1080pBrightness (cd/m2) 500 500Contrast Ratio (Bare Module) 1,200:1 1,500:1
Dynamic Contrast Ratio 10,000:1 12,000:1Viewing Angle 178/178 178/178Colors Reproduction (R,G,B) 8 Bit
10 Bit (8 Bit+Dithering)
Response Time (GTG) 8ms 5m/sUSB Port
USB Flash Drive Support Yes YesMP3/JPEG No YesVideo No Dvix Only
HDMI Support
HDMI 1.3 with Deep Color Yes YesSimplink (HDMI CEC) Yes Yes
Cabinet
Front Cabinet Style Glossy Black Glossy BlackRear Cabinet Style Matte Black & Red Glossy RedSpeaker Invisible Speaker Invisible SpeakerRoHS Yes YesVESA Compatible 200 x 200 200 x 200Wall Mount Model RW-230 AW-47LG30F
Power Specs
Voltage, Hz 100-240Vac 50/60Hz 100-240Vac 50/60HzConsumption (Max) 150W 310WConsumption (Typical) 130W 290WStand-by 1W 1W
42LG6032LG40
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OveRvIeW32LG40 DIMeNSIONS
7.9"200mm
21.7"551.2mm
3.9"100mm
3.5"89mm
11"279mm
31.8"808mm
9 11/16"246.06mm
8.38"212.74mm
Remove 4 screws to remove stand for wall mount
Model No.Serial No.Side Label
12"304.8mm
17.1"434.34mm
24.8"629.92mm
4.3"109mm
11.8"299.7mm
Not Center
Center
3.9"100mm
42LG60 DIMeNSIONS 42LG60 Dimensions
7.9"200mm
29.4"746.76mm 14.7"
373.38mm
40.9"1038.86mm
Remove 4 screws to remove stand for
wall mount
Model No.Serial No.
Label
15.8"402mm
20.5"520.7mm
31.3"795mm
2.4"60.96mm
14.9"376.46mm
Center
3.9"100mm
6.6"168.78mm
8"204.4mm
11.85"301mm
1.94"49.2mm
Fall 2008 LCD Training 9
OveRvIeWReMOTe CONTROL
2008 models feature a newly designed, easier to use remote. The remote has fewer buttons than previous designs which was accomplished by moving many functions to an on-screen Quick Menu. The Q. MENU button on the remote opens the Quick Menu and the user can choose between options like aspect ratio, closed captions, sleep timer, etc. The remotes are programmable for other devices. These LCDs also support SimpLink devices. When using SimpLink, the device buttons on the remote do not need to be pressed to switch modes before controlling external equipment. External devices are controlled by the TV instead of the remote.
NeW FeATUReSBelow are some of the new features on some 2008 LCD TVs.Intelligent sensor - LGs Intelligent Sensor uses 4,096 sensing steps
to evaluate its surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness and white balance. The result is a picture optimized for its surroundings, more pleasing to watch. It can also save up to 50% in power consumption since the screen will brighten and dim to match ambient lighting.
TruMotion 120Hz - Advance 120Hz panel provides clear, smooth images, even during fast action scenes creating a stable structure for a crisper picture.
24p Real Cinema - Hi-def movies run at exactly 24 frames per second speed that they were originally filmed in, making the home-cinema experience one step closer to a Real Cinema experience.
Full HD 1080p Resolution - Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. Standard HD LCDs are 1366 x 768.
Clear Voice Technology - Isolates the dialog (human voice range) by boosting the mid-range tones from 300hz to 3500hz.
Expert Menu - Expert Menu features Imaging Science Foundation Certified Calibration Controls which allow precise in-home picture calibrations.
INPUT
FAV
MUTE
TV
STB
POWER
Q. MENU MENU
AV MODERETURN
ENTER
VOL CH
1 2 3
4 5 6
7 8
0
9
FLASHBK
PAGE
DVD
VCR
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OveRvIeWCOMPUTeR CONNeCTION
A computer can be connected to the RGB (VGA) or HDMI connection on the TV. The HDMI connection will require a DVI to HDMI adapter if the PC has a DVI connector. Set the monitor output resolution and vertical frequency on the PC before connecting it to the TV. Refer to the owners manual for a full list of suported resolutions. The message OUT OF RANGE will appear on the screen if the resoultion is not supported.
SeRvICe MeNUThe service menus can be used to make adjustments, change color alignment, and get software versions. There are two service menus. The Adjust and Instart menu can be accessed using the service remote (Service remotes are available from LG parts). They can also be accesed by holding down the menu button on the TV and the remote until the user menu disappears. The menus alternate between Adjust and Instart every time the menu button is held down. If the TV asks for a password, enter 0000 (four zeros).
ModelOn Stand-By
TYP MAX UNIT TYP MAX UNIT
19LS4D-UA 42W 0.85 1W20LS7D-NB 56W 0.85 1W20LS7D-UK 56W 0.85 1W22LC2D-UB 46W 0.85 1W22LS4D-UA 46W 0.85 1W23LS7D-NB 78W 0.85 1W23LS7D-UK 78W 0.85 1W26LC7DC-UB 110 160W 0.7 1W26LC7DC-UK 30 160W 0.7 1W26LC7D-UK 30 160W 0.7 1W26LG30DC-UA 99 115W 0.36 0.8W32LC4D-UA 150 190W 0.7 1W32LC50C-UA 190W 3W32LC5DC-UA 190W 3W32LC7DC-UK 170 190W 0.7 1W32LC7D-UB 150 190W 0.7 1W32LC7D-UK 170 190W 0.7 1W32LG30DC-UA 149 171W 0.36 0.8W32LX50C-UA 190W 3W32LX5DC-UA 190W 3W37LC50C-UA 210W 3W37LC5DC-UA 210W 3W37LC7DC-UK 190 220W 0.8 1W37LC7D-UB 180 220W 0.8 1W37LC7D-UK 190 220W 0.8 1W37LG30DC-UA 167 191W 0.36 0.8W42LB50C-UA 240W 3W42LB5DC-UA 240W 3W42LC4D-UA 230 240W 0.8 1W42LC50C-UA 240W 3W42LC5DC-UA 240W 3W42LC7DC-UK 220 240W 0.8 1W42LC7D-UB 230 240W 0.8 1W42LC7D-UK 220 240W 0.8 1W42LG30DC-UA 226 244W 0.36 0.8W
POWeR CONSUMPTION
Resolution Vertical Frequency (Hz)30/40/50/60/70 series
1280x768 60Hz1360x768 60Hz1366x768 60Hz
50/60/70 series1600x1200 60Hz1920x1080 60Hz
Fall 2008 LCD Training 11
OveRvIeWSeRvICe ReMOTe
NUM KEY FUNCTION
1 POWER To turn the TV on or off
2 POWER ON To turn the TV on automatically if the power is supplied to the TV. Use the POWER key to deactivate; It should be deactivated when delivered.
3 MUTE To activate the mute function.
4 P-CHECK To check TV screen image easily.
5 S-CHECK To check TV screen sound easily
6 ARC To select size of the main screen (Normal, Spectacle, Wide or Zoom)
7 CAPTION Switch to closed caption broadcasting
8 TXT To toggle on/off the teletext mode
9 TV/AV To select an external input for the TV screen
10 TURBO SOUND To start turbo sound
11 TURBO PICTURE To start turbo picture
12 IN-START To enter adjustment mode when manufacturing the TV sets.
To adjust the screen voltage (automatic): In-start mute Adjust AV (Enter into W/B adjustment mode).
W/B adjustment (automatic): After adjusting the screen W/B adjustment Exit two times
13 ADJ To enter into the adjustment mode. To adjust horizontal line and sub-brightness.
14 MPX To select the multiple sound mode (Mono, Stereo or Foreign language).
15 EXIT To release the adjustment mode.
16 APC(PSM) To easily adjust the screen according to surrounding brightness.
17 ASC(SSM) To easily adjust sound according to the program type.
18 MULTIMIDIA To check component input.
19 FRONT-AV To check the front AV.
20 CH To move channel up/down or to select a function displayed on the screen.
21 VOL To adjust the volume or accurately control a specific function.
22 ENTER To set a specific function or complete setting.
23 PIP CH-(OP1) To move the channel down in the PIP screen. To use as a red key in the teletext mode.
24 PIP CH+(OP2) To move the channel in the PIP screen. To use as a green key in the teletext mode.
25 PIP SWAP(OP3) To switch between the main and sub screens. To use as a yellow key in the teletext mode.
26 PIP INPUT(OP4) To select the input status in the PIP screen. To use as a blue key in the teletext mode.
27 EYE To set a function that will automatically adjust screen status to match. The surrounding brightness so natural color can be displayed.
28 MENU To select the functions such as video, voice, function or channel.
29 IN-STOP To set the delivery condition status after manufacturing the TV set.
30 STILL To halt the main screen in the normal mode, or the sub screen at the PIP screen. Used as a hold key in the teletext mode. Page updating is stopped.
31 TIME Displays the teletext time in the normal mode. Enables to select the sub code in the teletext mode.
32 SIZE Used as the size key in the PIP screen in the normal mode. Used as the size key in the teletext mode.
33 MULTI PIP Used as the index key in the teletext mode. Top index will be displayed if it is the top text.
34 POSITION To select the position of the PIP screen in the normal mode. Used as the update key in the teletext mode (Text will be displayed if the current page is updated.)
35 MODE Used as Mode in the teletext mode.
36 PIP To select the simultaneous screen.
37 TILT To adjust screen tilt.
38 0~9 To manually select the channel.
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OveRvIeWCHeCk FIRMWARe veRSION
You can check the firmware version by opening the service menu. It is located near the top of the menu.
UPDATe FIRMWARe1) Copy the firmware to the top
level on a USB flash drive and to a folder named LG_DTV. Some models require the LG_DTV folder, and some dont. Put it in both locations if you are not sure which is correct. Only copy the file (or files) for the model you are currently updating. 2) Turn on the TV and insert the USB drive to the USB IN port.
3) If the firmware is newer than what is already installed, the upgrade menu should open automatically. If the update menu doesnt open, press MENU on the user remote and select OPTION. Now press the Fav key 7 times and the upgrade menu will open.
4) Select START and press ENTER on the remote to start the software upgrade.5) The TV will copy the update from the drive and then install it. Do not turn the TV off
until it is finished.6) The TV will automatically turn off and back on after the upgrade is successfully
finished.7) Check the firmware version to verify the update was succesful.
Model Name Bar Code (Code 128, Contains the manufacture No.) Manufacture No. The trade name of LG Electronics Manufactured date (Year & Month) The place Origin Model Sux
LP81A LPL L42FHDMain V1.62 USB V2.1400 HDCP 0UTT 97
Tool Option1 39848Tool Option2 51Area Option 1OPTION1 43OPTION2 46OPTION3 0OPTION4 0System ControlAudio PrescaleThresholdPower Off HistoryPanel ControlDavinci / Auto Test
LP81A LPL L42FHDMain V1.62 USB V2.1400 HDCP 0UTT 97
Tool Option1 39848Tool Option2 51Area Option 1OPTION1 43OPTION2 46OPTION3 0OPTION4 0System ControlAudio PrescaleThresholdPower Off HistoryPanel ControlDavinci / Auto Test
Fall 2008 LCD Training 13
32LG40
Fall 2008 LCD Training 13
DISASSeMBLy
DISASSeMBLy 32LG40BACk COveR ReMOvAL
Remove the 18 screws shown. Pay attention to the size and type of screw as there are many different types. Putting in the improper screw when reassembling may cause damage. The stand does not need to be removed.
LCD Driver (T-CON)
Power Supply
SideInputs
Main (Digital) BoardBallast
Front Keypad
DVD Player
Keypad
BOARD LAyOUT
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DISASSeMBLy
POWeR SUPPLy ReMOvALDisconnect P203, P201, and AC In. Now remove the 4 screws indicated.
MAIN BOARD ReMOvALRemove the Right side decorative plastic piece by removing the top and bottom screws. Remove the remaining 6 screws and remove the shield covering the Main board. Careful at this point, the board will swing free of the supports. Disconnect P902, P800, P901, P900, P904, P401, and P500. Note: In the top right is connector P200. This is an open connection for software upgrades. Remove the 2 screws securing the Side input decorative plastic piece on the right. Finally, remove the 4 screws securing the Main board as indicated.
Fall 2008 LCD Training 15
32LG40
Fall 2008 LCD Training 15
DISASSeMBLy
CN1 LVDS
Remove Screw
Remove Screw
Remove Screws and Remove Brace
Remove Screw
LCD DRIveR ReMOvALRemove the screws and then the brace.
Carefully remove the LVDS cable and then the board. If just removing the shield and not the board, re-install the 3 screws that held the shield on to establish ground.
Remove LVDS Cable
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DISASSeMBLyBALLAST ReMOvAL
Remove the shield and then the ballast. Be sure all heat sinks and insulators are in place when re-assembling.
Protects the Outputs
Insulator
InsulatorShiny Side
Down(Conductive)
Cut Out
AlignmentNotch
Alignment Notch
Heat Transfer MaterialShield
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Fall 2008 LCD Training 17
DISASSeMBLy
DvD PLAyeR ReMOvALDisconnect CN400, CN401, and CN402. Now the DVD Player can be removed.
CN400
CN401
CN4002
This screw hidden by tape in previous photo (Step2).
DvD PLAyeR ReMOvALRemove the tape and then remove the 8 screws holding the DVD Player in place.
RemoveTape
RemoveTape
CN402
CN400
CN401
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DISASSeMBLy
Loc Part # Description Specification120 EAB41418001 Speaker,Woofer EN21C-6742(55) FERRIT 10W 8OHM 78DB 140HZ 55X37 121 EAB41284402 Speaker,Tweeter D025D12K1401(10/90) 33uF/50V 20W 4OHM 68DB 590HZ122 ABA36844404 Bracket Assembly SPEAKER 32LG40 LA89A SPK BRKT ASSY LEFT, CKD OF 123 ABA36844403 Bracket Assembly SPEAKER 32LG40 LA89A SPK BRKT ASSY RIGHT , CKD O200 EAJ41825601 LCD,Module-TFT LC320WXN-SAA1 WXGA 32.0INCH 1366X768 500CD - 72%300 ABJ36840802 Cabinet Assembly 32LG40 LA89A 32 DVDP, CKD OF 01 , US400 ACQ36842402 Cover Assembly,Rear 32LG40 LA89A 32 DVDP, CKD 01 , US500 EBR44342401 PCB Assembly,Front 32LG40 LED & P/SW T.T LA89A LG40 32 Breathing[Re510 EBR43501201 PCB Assembly,Sub SUB T.T LA89A 32LG40-UA AUSQLHX 32LG40-UA Sub Co521 ABA35569917 Bracket Assembly BRACKET 32LG40 LA89A DVDP SIDE AV BRACKET ASSY, 530 EAY40504401 SMPS,AC/DC 08H 3237 90VTO264V 180W 50~60Hz UL/CSA/SEMKO Yuy531 MGJ42154602 Plate,Metal PRESS SBHG 0.5T SHIELD SPTE METAL POWER board 3540 EBU43499001 Main Total Assembly 32LG40-UA BRAND LA89A550 EBT50140201 Chassis Assembly POWER(SMPS) LA89A AC INLET Assy for 32LG40-UA560 EBT43504901 Chassis Assembly SUB LA89A 32LG40-UA DVDP Assy
800-806 Plate,Metal METAL FRAMES820 MGJ40652302 Plate,Metal PRESS SECC 0.6T SHIELD SECC 32LG40 main shield 821 MGJ40315501 Plate PRESS EGI 0.8t FRAME SBHG-A 42LG50 METAL, SHIELD822 MGJ40651701 Plate,Shield PRESS SPTE 0.3T SHIELD SPTE SIDE AV900 AAN36842703 Base Assembly STAND 32LG40 LA89A STAND ASSY(WITHOUT STAND BODY910 MAZ42150502 Bracket MOLD ABS SUPPORTER 32LG40, DVDP - ABS STAND TOP
Part numbers subject to change. Check GCSC (aic.lgservice.com) for the current part numbers.
exPLODeD vIeW
300
121120
122123
500
510
800
804
801
803
805
802
806
400
900
910
200
560
822
540521
821 820530
531
550
Fall 2008 LCD Training 19
32LG40
Fall 2008 LCD Training 19
CIRCUIT DeSCRIPTIONS
CIRCUIT DeSCRIPTIONS 32LG40
F1013.15A/250V250V
P201To Main
AC In
F1005A/250V
= Warning, Hot Ground
P203To Ballast
POWeR SUPPLy (SMPS)
NoConnection
F1013.15A/250V250V
P201To Main
AC In
F1005A/250V
= Warning, Hot Ground
P203To Ballast
1 1
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CIRCUIT DeSCRIPTIONSPOwER SUPPlY CONNECTORS
P201 SMPS to P800 Main
Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check
23 N/C 0V 3.2V OL 24 N/C 0V 0V OL
21 BR1 0V 1.68V OL 22 PWM-DIM 0V 3.38V OL
19 PWR 0V 2.86V OL 20 INV On/Off 0V 3.29V OL
17 ERR 0V 3.3V 1.26V 18 ACD 5.05V 4.57V OL
15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd
13 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd
11 5.2V 5.15V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V
9 5.2V 5.15V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V
7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V
5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V
3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd
1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V
BR1 Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%
P203 SMPS to MCN1 BallastPin Label STBY Run Diode Check1 24V 0V 24.52V 0.33V
2 24V 0V 24.52V 0.33V
3 24V 0V 24.52V 0.33V
4 24V 0V 24.52V 0.33V
5 24V 0V 24.52V 0.33V
6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd
10 Gnd Gnd Gnd Gnd11 BR1 0V 1.67V OL
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CIRCUIT DeSCRIPTIONSPOwER SUPPlY TESTThe Power Supply must be producing STAND-BY +5V before performing this test. With the Power Supply disconnected from other boards and AC applied, confirm that the Power Supply is producing 5V from either Pins 9, 10, 11 or 12. If not, check the fuse. If the fuse is ok and there is no 5V, replace the Power Supply. If 5V is ok, continue.1st short either pin 9, 10, 11 or 12 (5V) to pin 19 (PWR) using a 10K resistor. The P201 connector should be disconnected from the Main board and AC not applied when adding the jumper. Re-apply power when testing.Confirm that the other low voltage power supplies are activated. Pins 1 and 2: 16V Pins 5 and 6: 12V Pin 18: AC Detect goes high Fuse F101: Check for 350V (Ballast Voltage)If any voltage missing, replace the Power Supply. If the 1st test was successful, leave the 10K resistor in place.BACklIGhT TESTTo test the Backlights, leave the 10K jumper in place from the previous test. Plug in the Backlight plug P203 and apply AC power. Observe the Backlights. If normal, LED1 on the Ballast board should turn on first, then the backlights should turn on and LED1 should go off.If no backlight activity, confirm the Fuse F101 has approximately 350V on both sides. If only on one side, check fuse for open. If no 350V on either side, replace the Power Supply. If 300V is present, check P203 for 24V on pins 1-5. Check P203 pin 12 for at least 3V (Inverter On/Off). If yes, confirm connectors to backlight are ok, if ok, then the panel is defective.
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
INV
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CIRCUIT DeSCRIPTIONSMAIN (DIGITAL) BOARD
3.39V0VReset (Lo-Hi)OUT3
9V0V+9VOUT3GndGndGndGnd2
GndGndGndGnd23.4V0VD3.3V_BCMIN1
12V0V+12VIN1RUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPINRESET GENERATOR TO IC401 (On Back)IC400
+9V RegulatorIC8031.29V0VDDRO_VTTOn/Off Control4
3.2V0V+5V_SUBIN32.6V0VD2.6V_BCMIN5,6,7
GndGndGndOUT21.29V0VDDRO_VTTOUT3,8
5V0V+3.3VGnd1RUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPIN2.6V BCMIC304
+3.3V Regulator (3.3V TMDS_SW)IC8023.1V0V+3.3VOUT8
0.6V0.6VReset (Lo-Hi)OUT35V0VUSB_PWR_Out_1OUT7
GndGndGndGnd23.4V0VBCM DDR PowerOn/Off Control3
3.41V3.41V3.3V_MICONIN15V0V+5VIN2
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
RESET GENERATOR FOR Q400IC405USB PowerIC201
3.39V0VReset (Lo-Hi)OUT3
9V0V+9VOUT3GndGndGndGnd2
GndGndGndGnd23.4V0VD3.3V_BCMIN1
12V0V+12VIN1RUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPINRESET GENERATOR TO IC401 (On Back)IC400
+9V RegulatorIC8031.29V0VDDRO_VTTOn/Off Control4
3.2V0V+5V_SUBIN32.6V0VD2.6V_BCMIN5,6,7
GndGndGndOUT21.29V0VDDRO_VTTOUT3,8
5V0V+3.3VGnd1RUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPIN2.6V BCMIC304
+3.3V Regulator (3.3V TMDS_SW)IC8023.1V0V+3.3VOUT8
0.6V0.6VReset (Lo-Hi)OUT35V0VUSB_PWR_Out_1OUT7
GndGndGndGnd23.4V0VBCM DDR PowerOn/Off Control3
3.41V3.41V3.3V_MICONIN15V0V+5VIN2
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
RESET GENERATOR FOR Q400IC405USB PowerIC201
MAIN (TOP) REGUlATOR ChECkS
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CIRCUIT DeSCRIPTIONS
GndGndGndGnd11,18,19,20
n/cn/cn/cn/c14,15
2.66V0VD2.6V_BCMOUT1,2,3,4,5
3.41V0VPower_CTL_2.6VOn/Off Control17
4.98V0.36V+5V_SUBIN6,7,8,10
GndGndGndGndERUNSTBYNAMEFUNCTIONPIN
0V0V3.3VVST_MICONVccCD2.6V/A2.6V_BCM RegulatorIC809
0.6V0.6VResetResetBGndGndGndGnd5
RUNSTBYNAMEFUNCTIONPINn/cn/cn/cn/c4
RESET GENERATOR FOR MICRO IC407Q4005V0V+5VOUT3
GndGndGndGndE3.4V0VPower_CTL_3.3VOn/Off Control2
5V0VST_5VPull DownC8.9V0V+9VIN1
3.29V0VRL_ONOn/Off ControlBRUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPIND3.3V/A3.3V_BCM RegulatorIC807
5V SUB SWITCH CONTROLLER for Q801Q8023.4V0.1VD3.3V_BCMOUT4
5V0V+5V_SUBOUT5,6,7,8GndGndGndGnd3
0.28V0VQ802On/Off Control2,45V0.36V+5V_SUBIN2
5V0VST_5VIN1,33.4V0VPower_CTL_3.3VOn/Off Control1
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
5V SUB SWITCHQ801D3.3V/A3.3V_BCM Regulator turns on LD800IC806
GndGndGndGnd11,18,19,20
n/cn/cn/cn/c14,15
2.66V0VD2.6V_BCMOUT1,2,3,4,5
3.41V0VPower_CTL_2.6VOn/Off Control17
4.98V0.36V+5V_SUBIN6,7,8,10
GndGndGndGndERUNSTBYNAMEFUNCTIONPIN
0V0V3.3VVST_MICONVccCD2.6V/A2.6V_BCM RegulatorIC809
0.6V0.6VResetResetBGndGndGndGnd5
RUNSTBYNAMEFUNCTIONPINn/cn/cn/cn/c4
RESET GENERATOR FOR MICRO IC407Q4005V0V+5VOUT3
GndGndGndGndE3.4V0VPower_CTL_3.3VOn/Off Control2
5V0VST_5VPull DownC8.9V0V+9VIN1
3.29V0VRL_ONOn/Off ControlBRUNSTBYNAMEFUNCTIONPIN
RUNSTBYNAMEFUNCTIONPIND3.3V/A3.3V_BCM RegulatorIC807
5V SUB SWITCH CONTROLLER for Q801Q8023.4V0.1VD3.3V_BCMOUT4
5V0V+5V_SUBOUT5,6,7,8GndGndGndGnd3
0.28V0VQ802On/Off Control2,45V0.36V+5V_SUBIN2
5V0VST_5VIN1,33.4V0VPower_CTL_3.3VOn/Off Control1
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
5V SUB SWITCHQ801D3.3V/A3.3V_BCM Regulator turns on LD800IC806
MAIN (BOTTOM) REGUlATOR ChECkS
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CIRCUIT DeSCRIPTIONS
Screen Print for Pin No is incorrect, use IC
GndGndGndGnd11,12,18,19,20
0V0Vn/cn/c13, 14,15,16
12.36V0VLVDS 12VOUT5,6,7,81.29V0VD1.2V_BCMOUT1,2,3,4,5
6.16V0VQ900On/Off Control2,43.41V0VPower_CTL_1.2VOn/Off Control17
12.36V0V12VIN1,35V0.38V+5V_SUBIN6,7,8,10
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
LVDS 12V SWITCHQ901D1.2V/A1.2V BCM REGULATORIC805
0V0VGndGndE3.29V0.26V3.3V_TMDS_SWIN3
0V0VLVDS Switch ControlPull Down 12VC1.8V0V'+1.8V_NTPOUT2
0.75V0VLVDS_PANEL_CTRLControlBGndGndGndGnd1
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
LVDS 12V SWITCH CONTROLLER Q901Q900+1.8V_NTP REGULATORIC801
GndGndGndGnd43.4V0VBCM_RESETOUT6
3.43V3.43V3.3VST_MICONOUT33.4V0VReset from IC400On/Off Control1
5V5VST_5VIN23.41V0VD3.3V_BCMIN14
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
ST-BY 3.3V DC-DC CONVERTERIC808BCM RESETIC401
Screen Print for Pin No is incorrect, use IC
GndGndGndGnd11,12,18,19,20
0V0Vn/cn/c13, 14,15,16
12.36V0VLVDS 12VOUT5,6,7,81.29V0VD1.2V_BCMOUT1,2,3,4,5
6.16V0VQ900On/Off Control2,43.41V0VPower_CTL_1.2VOn/Off Control17
12.36V0V12VIN1,35V0.38V+5V_SUBIN6,7,8,10
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
LVDS 12V SWITCHQ901D1.2V/A1.2V BCM REGULATORIC805
0V0VGndGndE3.29V0.26V3.3V_TMDS_SWIN3
0V0VLVDS Switch ControlPull Down 12VC1.8V0V'+1.8V_NTPOUT2
0.75V0VLVDS_PANEL_CTRLControlBGndGndGndGnd1
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
LVDS 12V SWITCH CONTROLLER Q901Q900+1.8V_NTP REGULATORIC801
GndGndGndGnd43.4V0VBCM_RESETOUT6
3.43V3.43V3.3VST_MICONOUT33.4V0VReset from IC400On/Off Control1
5V5VST_5VIN23.41V0VD3.3V_BCMIN14
RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN
ST-BY 3.3V DC-DC CONVERTERIC808BCM RESETIC401
MAIN BOARD X400 AND X200 ChECk
2.4Vp/p24Mhz
With set on or off
X400 2.4Vp/p24Mhz
With set on or off
X400
Main PWBX400 Location
Main PWBX200 Location
MAIN PWB
660mVp/p54Mhz
Only when set is on
X200660mVp/p
54Mhz
Only when set is on
X200
1.48V
1.49V
Use Crystal Side R232 or R233
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CIRCUIT DeSCRIPTIONS
TUNER vIDEO AND SIF OUTPUT ChECkFor Easy Access, pop the shield off the tuner. If you leave the shield on you can still access the same pins. Be careful not to accidentally ground out you test lead on the shield.
Pin 16 Composite Video
Pin 14 Audio SIF
Pin 3 Tuner B+ (5V)
MAIN PWB
1Vp/p 20uSec rate
Pin 16 VideoSignal
1Vp/p 20uSec rate
Pin 16 VideoSignal
Pin 14 SIFSignal
850mVp/p 20nSec rate
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CIRCUIT DeSCRIPTIONSMAIN lvDS ChECkTo confirm that the Main board is outputting Picture Content signals, check P902 (LVDS) for output. Check pins 11-20. This signals vary, but looking for signals like the ones shown below on any of these pins will confirm the output of video content. This signal is using a standard SMTE Color Bar output from a generator as the input source. Remember there are actually 10 pins with LVDS signals. This only represents two waveforms as an example.
P902Location
Pin 11
Pin 16
MAIN PWB
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CIRCUIT DeSCRIPTIONS
P800 Main to P201 SMPS P401 MAIN to Front KeysPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1, 2 16V 0V 16V OL 1 KEY3 3.4V 3.4V 1.4V3, 4 Gnd Gnd Gnd Gnd 2 KEY4 3.4V 3.4V 1.4V5, 6 12V 0V 11.8V 3.03V 3 Gnd 0V 0V Gnd7, 8 Gnd Gnd Gnd Gnd 4 Gnd 0V 0V Gnd
9, 10 ST-5V 5V 5.15V 1.23V 5 KEY-1 3.4V 3.4V 1.4V11, 12 ST-5V 5V 5.15V 1.23V 6 KEY-2 3.4V 3.4V 1.4V13, 14 Gnd Gnd Gnd Gnd 7 n/c 0V 0V OL15, 16 Gnd Gnd Gnd Gnd 8 ST-5V 5V 5V 0.53V
17 VBR-B 5V-MNT 0V 3.3V OL 9 PWM-LED 0V 0V 0.8V18 AC-DET 5V 4.57V OL 10 IR 4.1V 4.1V 2.3V19 RL-ON 0V 2.86V 1.25V 11 n/c 0V 0V OL20 INV-On/Off 0V 3.29V 2.15V 12 Gnd 0V 0V Gnd21 BR1 0V 1.68V OL 13 LED-G 0V 2.1V 0.8V22 VBR-B 0V 3.38V 2.15V 14 LED-R 2.1V 0V 0.8V23 n/c 0V 3.2V OL 15 Gnd 0V 0V Gnd24 n/c 0V 0V OL
ADIM Pin 21 varies according to OSD Backlight setting. 0.9V 0% to 3.3V 100%
P904 Main to CN401 DVD PlayerPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 n/c 3.34V 3.34V OL 14 n/c 0V 0.7V OL
2 Disc Check 3.34V3.4V With Disc Player
0V No Disc Player 1.60V 15 n/c 0V 0V OL
3 n/c 3.34V 3.3V OL 16 DVD-SPDIF 3.38V 1.8V 0.83V4 n/c 3.34V 3.3V OL 17 DVD-MUTE 0V 0V OL5 Gnd 0V Gnd Gnd 18 DVD-L-In2 0V 2.4V OL6 Pr 0V 0.8V OL 19 Gnd 0V 0V Gnd7 Pb 0V 0.8V OL 20 DVD-R-In2 0V 2.4V OL8 Y 0V 0.6V OL 21 n/c 0V 0V OL9 Gnd 0V 0V Gnd 22 Gnd 0V 0V Gnd10 n/c 0V 0V OL 23 n/c 0V 0V OL11 Gnd 0V 0V Gnd 24 n/c 0V 0V OL12 n/c 0V 0V 0.83V 25 Gnd 0V 0V Gnd13 Gnd 0V 0V Gnd 26 n/c 0V 0V OL
MAIN vOlTAGES
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CIRCUIT DeSCRIPTIONSMAIN vOlTAGESFor locations, refer to the Main boards bottom view. The panel control is on pin 33 of IC407. Q900 turns on Q901, the LVDS Switch generats LVDS 12V. All voltages are shown on the Interconnect diagram in the schematics section. LVDS Signal Waveforms are shown on the back of Interconnect diagram.
LVDS 12VLVDS 12V
P902 Main to CN1 T-CONPin Label SBY Run Diode Check Pin Label SBY Run Diode Check1 LVDS 12V 0V 12.3V OL 2 LVDS 12V 0V 12.3V OL3 LVDS 12V 0V 12.3V OL 4 LVDS 12V 0V 12.3V OL5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd11 LVDS 0V 1.2V 0.98V 12 LVDS 0V 1.1V 0.98V13 LVDS 0V 1.2V 1.11V 14 LVDS 0V 1.05V 1.06V15 LVDS 0V 1.1V 1.06V 16 LVDS 0V 1.09V 1.05V17 LVDS 0V 1.08V 1.11V 18 LVDS 0V 1.13V 1.06V19 LVDS 0V 1.14V 1.11V 20 LVDS 0V 1.06V 1.06V21 n/c 0V n/c OL 22 n/c 0V n/c OL23 n/c 0V n/c Gnd 24 n/c 0V n/c OL25 Size Sel 0.4V 3.07V 3V 26 Gnd 0V 0V Gnd
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CIRCUIT DeSCRIPTIONS
P500 Main to Speakers P200 Main Software DownloadPin Label SBY Run Diode Check Pin Label SBY Run Diode Check1 R+ 0V 8.14V 2.78V 1 Vcc 0V 5V OL2 R- 0V 8.14V 2.78V 2 SCL 0V 5V OL3 L+ 0V 8.15V 2.78V 3 SDA 0V 5V OL4 L- 0V 8.15V 2.78V 4 Gnd 0V 0V Gnd
P900 Main to P402 DVD PlayerPin Label Stby Run Diode Check
1 Disk-Enable 3.4V 3.4V No Disc 0V Disc In 1.68V
2 DVDP-RXD 0.7V 3.08V 3V3 DVDP-TXD 0.7V 3.4V 3V4 Gnd Gnd 0V Gnd
P901 Main to CN400 DVD PlayerPin Label Stby Run Diode Check1 12V 0V 12.3V 3V2 Gnd 0V 0V Gnd3 DVDP 3.3V 3.4V 3.37V .099V4 Gnd 0V 0V Gnd5 Gnd 0V 0V Gnd6 5V 0V 5.01 0.45V
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CIRCUIT DeSCRIPTIONS
MCN1
To BacklightRight Side
To BacklightLeft Side
Transformers
Ballast Start DetLED LED1
F18A/125V
BALLAST ASSeMBLy
MCN1
Ballast Start DetLED LED1
To BacklightRight Side
To BacklightLeft Side
Transformers
F18A/125V
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CIRCUIT DeSCRIPTIONSBAllAST TRANSFORMER wAvEFORMSWarning: secondary is over 1.2Kv.
BAllAST hEAT SINkSBe sure to replace all heat sink materials and insulators.
T1/T2 Pin 6
TransformersTransformers
T1/T2 Pin 1
34V p/p 64.89kHz22.2V p/p 220kHz
PrimarySide
Protects the Outputs
Insulator
InsulatorShiny Side
Down(Conductive)
Cut Out
AlignmentNotch
Alignment Notch
Heat Transfer MaterialShield
MCN1 Ballast to P203 SMPSPin Label Stby Run Diode1 VBL 0V 24.52V OL2 VBL 0V 24.52V OL3 VBL 0V 24.52V OL4 VBL 0V 24.52V OL5 VBL 0V 24.52V OL6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd10 Gnd_1 Gnd Gnd Gnd11 BVR_A 0V 1.67V OL12 On/Off 0V 3.45V OL13 VBR_B 0V 3.40V OL14 Gnd_2 Gnd Gnd Gnd
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CIRCUIT DeSCRIPTIONSLCD DRIveR (T-CON)
If you test the TV with the shield off of the LCD Driver, reinstall the screws for grounding purposes. Use the Connector P902 on the Main board for Voltages and Signal readings.
lvDS CABlETo remove, press in from the sides and lift out. Be careful when removing, press the release tabs to avoid damage to the board or the cable.
CN2 CN3
CN1 LVDS
US2
To Main
To TFT Panel To TFT Panel
3) 0.0V2) 1.8V1) 3.3V
US2
12VF1
6.3V/1.5A
Press in Press in
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CIRCUIT DeSCRIPTIONSlCD DRIvER vOlTAGESUse P902 on the Main board for making voltage, resistance, and waveform checks.
CN1 LCD Drvier to P902 Main Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 LVDS 12V 0V 12.3V OL 2 LVDS 12V 0V 12.3V OL3 LVDS 12V 0V 12.3V OL 4 LVDS 12V 0V 12.3V OL5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd11 LVDS 0V 1.2V 0.98V 12 LVDS 0V 1.1V 0.98V13 LVDS 0V 1.2V 1.11V 14 LVDS 0V 1.05V 1.06V15 LVDS 0V 1.1V 1.06V 16 LVDS 0V 1.09V 1.05V17 LVDS 0V 1.08V 1.11V 18 LVDS 0V 1.13V 1.06V19 LVDS 0V 1.14V 1.11V 20 LVDS 0V 1.06V 1.06V21 n/c 0V n/c OL 22 n/c 0V n/c OL23 n/c 0V n/c Gnd 24 n/c 0V n/c OL25 Size Sel 0.4V 3.07V 3V 26 Gnd 0V 0V Gnd
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CIRCUIT DeSCRIPTIONSDvD PLAyeR
DvD PlAYER vOlTAGESResistance should be taken in diode mode with the connectors removed.*Pin 2: 3.4V with DVD Player and 0V with no DVD Player.
CN401 Connector DVD to P904 Main
Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check
1 nc 3.34V 3.34V 3.13V 14 nc 0V 0.7V 0.15V
2 Check 3.34V *0V 3.13V 15 nc 0V 0V Gnd
3 nc 3.34V 3.3V 3.13V 16 SPDIF 3.38V 1.8V OL
4 nc 3.34V 3.3V 2.34V 17 DVDP-MUTE 0V 0V 2.3V
5 Gnd Gnd Gnd Gnd 18 DVDP-L 0V 2.4V 1.1V
6 DVDP-Pr 0V 0.8V OL 19 Gnd 0V 0V Gnd
7 DVDP-Pb 0V 0.8V OL 20 DVDP-R 0V 2.4V 1.1V
8 DVDP-Y 0V 0.6V OL 21 nc 0V 0V OL
CN400 DVD to P901 Main CN402 DVD to P900 MainPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 P12V 0V 12.3V 3.22V 1 GP101 3.4V 0V OL2 Gnd Gnd Gnd Gnd 2 TXD1 0.7V 3.08V OL3 P3.3V 3.4V 3.37V 0.78V 3 RXD1 0.7V 3.4V OL4 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd5 Gnd Gnd Gnd Gnd6 P5V 0V 5V 1.2V
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CIRCUIT DeSCRIPTIONSFRONT BOARD
FRONT vIEw
REAR vIEw
J2 J1To Main PWBTo Side Keys PWB ZD3
3.4V Zener
ZD15V Zener
ZD24.1V Zener
POWERBUTTON
IR Receiver
POWER LED
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CIRCUIT DeSCRIPTIONSFRONT BOARD vOlTAGESResistance should be taken in diode mode with the connectors removed.
SIDE CONTROl kEYSResistance should be taken in diode mode with the connectors removed.
P101 Side Control to J2 FrontPin Label Stby Run Diode Check1 Key 1 3.4V 3.4V OL2 Gnd 0V 0V Gnd3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd5 Key 3 3.41V 3.41V OL6 Gnd 0V 0V Gnd7 Key 4 3.41V 3.41V OL8 Gnd 0V 0V Gnd
J1 Front board to P401 Main J2 Front board to P101 Side KeyPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 KEY3 3.4V 3.4V OL 1 Key 1 3.4V 3.4V OL2 KEY4 3.4V 3.4V OL 2 Gnd 0V 0V Gnd3 Gnd 0V 0V Gnd 3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd5 KEY-1 3.4V 3.4V OL 5 Key 3 3.41V 3.41V OL6 KEY-2 3.4V 3.4V OL 6 Gnd 0V 0V Gnd7 n/c 0V 0V OL 7 Key 4 3.41V 3.41V OL8 ST-5V 5V 5V 2.7V 8 Gnd 0V 0V Gnd9 PWM-LED 0V 0V 2.4V
10 IR 4.1V 4.1V OL11 n/c 0V 0V OL12 Gnd 0V 0V Gnd13 LED-G 0V 2.1V 3.2V14 LED-R 2.1V 0V 3.2V
15 Gnd 0V 0V Gnd
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CIRCUIT DeSCRIPTIONS
P101 Side Control to J2 FrontPin Label Stby Run Diode Check1 Key 1 3.4V 3.4V OL2 Gnd 0V 0V Gnd3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd5 Key 3 3.41V 3.41V OL6 Gnd 0V 0V Gnd7 Key 4 3.41V 3.41V OL8 Gnd 0V 0V Gnd
INvISIBLe SPeAkeR SySTeM
Bottom View of Woofer Ports
Woofers
Tweeters Tweeters
Stand Removed
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DISASSeMBLy
DISASSeMBLy 42LG60INTRODUCTION
This section of the manual will discuss Disassembly of the 42LG60 LCD Direct View Television. Upon completion of this section the Technician will have a better understanding of the disassembly procedures.
BACk COveR ReMOvALRemove the 13 screws shown. Pay attention to the size and type of screw as there are different types. Putting in the improper screw when reassembling may cause damage. Handle the TV carefully while the 4 stand screws are removed. The stand fits snuggly, but could fall out and cause injury. For safety, put the 4 stand screws back after removing the back cover.
BOARD LAyOUT
LCD Driver (T-CON)
Backlight Connection
Control Board
Power Supply Main Board
Backlight Connection
LVDSCables
With shield removed
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DISASSeMBLy
MAIN BOARD ReMOvALDisconnect P401, P501, P800, P801, and P900. Note: In the bottom right is connector P200. This is an open connection. Remove the 2 screws securing the Side input decorative plastic piece on the right. Remove the 6 screws securing the Main board indicated below. The Main board can also be lifted off the mounting frame by disconnecting P401 and P501. Remove the 1 screw securing the top mounting frame and swing the board away.
POWeR SUPPLy (SMPS) ReMOvALDisconnect P2, AC In, P402, and P402. Remove the 6 screws indicated below.
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DISASSeMBLyCONTROL BOARD ReMOvAL
Disconnect P101, P102 P103, and P104. Remove the LVDS cables by pressing in from the sides to release and then lift them out. Be careful when removing the LVDS Cables, theyre fragile. Press the release tabs to avoid damage to board or to the cable itself. Remove the 4 screws indicated below.
LCD DRIveR BOARD ReMOvALDisconnect CN1, CN2, CN3, and CN4. Remove the 3 screws indicated below.
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DISASSeMBLy
ToTweeters
Speaker BoxRemoved
SPeAkeR BOx ReMOvALTo remove the Speaker Box, remove the 4 screws show in circles. Then remove the wire harness. Carefully disconnect both Tweeters. Unplug P500 from the Main board.
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Fall 2008 LCD Training 43
DISASSeMBLyexPLODeD vIeW
Loc Part No Description Specification120 EAB41280401 Speaker,Full Range G1640401 FERRITE 10W 8OHM 82DB 110HZ 193.5X42X30121 EAB41284401 Speaker,Tweeter D025D12K1400(0/90) 33uF/50V 20W 4OHM 68DB 590HZ 122 ABA35890405 Bracket Assembly BRACKET 42LG30/50/70 - SPEAKER WOOFER BRACKET AS200 EAJ41866501 LCD Module LC470WUD-SAA1 FULLHD 47INCH 1920X1080 500CD COLO300 ABJ36383007 Cabinet Assembly 47LG70-UA Chicago 120Hz LA86A 47 47LG70_CABINET400 ACQ36384907 Cover Assembly,Rear 47LG70/90-UA Chicago 120Hz LA86A 47 47LG70/90_B500 EBR42600103 PCB Assembly,Front 47/52LG70 LED & P/SW T.T LC81E LG70 47,52 Breath510 EBR42056602 PCB Assembly,Sub CONTROL T.T LC81E 42/47LG70ED-CA . Soft touch co520 ABA35569906 Bracket Assembly BRACKET LG70 AB Side AV bracket assy(CHICAGO_120521 MGJ40651702 Plate,Shield PRESS SPTE 0.3T SHIELD SPTE SIDE AV for SKD530 EAY40505301 SMPS,AC/DC 08H 4247 90VTO264V 400W 50~60Hz UL/CSA/SEMKO Yu540 EBU50595701 Main Total Assembly 47LG70-UA.SUSQLJM BRAND LA86A550 EBT43368401 Chassis Assembly POWER(SMPS) - 47inch LG30/50 AC-INLET 150_straig810 MGJ40350204 Plate,Metal PRESS SECC 1.0 METAL SECC 47LG70 METAL MODULE820 MGJ40842103 Plate,Shield PRESS SECC 0.8T SHIELD SECC 42LG70_CHICAGO_120HZ830 MGJ41070804 Plate,Metal PRESS SBHG 0.6T SHIELD EGI PRESS SBHG 0.6T 840 MGJ40603902 Plate,Metal PRESS EGI 1.6 METAL EGI 47LG50 SHIELD PLATE 900 AAN35804113 Base Assembly STAND 47/52LG70 - 47/52LG70 Stand Assy LGEMX Loc
Part numbers subject to change. Check GCSC (aic.lgservice.com) for the current part numbers.
300
200801
400
901
900540820
530580810
120500
121560
510
803804 570
840
520521
830805802
- 44 -
- 44 -Fall 2008 LCD Training 45
42LG60
Fall 2008 LCD Training 45
CIRCUIT DeSCRIPTIONS
CIRCUIT DeSCRIPTIONS 42LG60INTRODUCTION
LCD Driver (T-CON)
Backlight Connection
Control Board
Power Supply Main Board
Backlight Connection
LVDSCables
With shield removed
Tuner
Digital Audio
Opitcal AudioRemote In
ComponentY/Pr/Pb
HDMI 1/2/3
PGB (PC) Audio
PGB (PC)
RS-232
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46 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONSBACkLIGHT LAyOUT
Back View 18 Bulbs
Power Supply with Ballast
To Backlights Over 1.2KV
58Khz
Fall 2008 LCD Training 47
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Fall 2008 LCD Training 47
CIRCUIT DeSCRIPTIONS
POwER SUPPlY vOlTAGES
INPUT AC 100V ~ 240V (50/60Hz) 3A
OUTPUT
St-by 5.2V (5A)
12V (2A)
16.5V (1.3A)
P401-P402 950V / 135mA
MODEL PLHL-T715A
F700 F101AC IN
P2 - To Main
P402To Backlight
P401To Backlight
8A/250V
5A/250V335V
P2 SMPS to P801 MainOdd Label Stby Run Diode Check Even Label Stby Run Diode Check
1 16V 0V 16V 0.94V 2 16V 0V 16V 0.94V3 Gnd Gnd Gnd 0V 4 Gnd Gnd Gnd 0V5 12V 0V 11.8V 1.32V 6 12V 0V 11.8V 1.32V7 Gnd Gnd Gnd 0V 8 Gnd Gnd Gnd 0V9 5V 5V 5.15V 1.49V 10 5V 5.15V 5.15V 1.49V11 5V 5V 5.15V 1.49V 12 5V 5.15V 5.15V 1.49V13 Gnd Gnd Gnd 0V 14 Gnd Gnd Gnd 0V15 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V17 ERR 3.19V 3.3V OL 18 ACD 4V 4.57V 1.85V19 PWR 0V 2.86V OL 20 INV 0V 3.29V OL21* ADIM 0.1V 1.68V OL 22 PDIM 0V 3.38V OL23 SEL 0V 3.2V OL 24 SYNC 0V 0V OL (Not Used)
* ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%
POWeR SUPPLy LAyOUT
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48 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONSPOwER SUPPlY TESTTo test everything but the backlights. Disconnect the P2 connector from the Main board. With the Power Supply disconnected from other boards and AC applied, confirm that the Power Supply is producing 5V from either pins 9, 10, 11 or 12. If not, check the fuse. If the fuse is ok and theres no 5V, replace the Power Supply. If 5V is ok then continue.Remove AC power when adding the jumpers shown in the image. Apply power when making the test. Short either pins 9, 10, 11 or 12 (5V) to pin 19 (PWR) using a 10K resistor. This turns on the power supply. Confirm that the other low voltage power supplies are activated. Pins 1 and 2 should be 16V. Pins 5 and 6 should be 12V. Pin 18 (AC Detect) should go high. BACklIGhT TESTIf the 1st test was successful, continue. Remove the power, leave the original 10K in place, and add a jumper between pin pin 19 (PWR) to pin 20 (INV). Apply AC Power to the board and observe the Backlights. If normal, the backlights should turn on and off 4 times then go off.If only 1/2 the backlights light (right side or left side), confirm the connectors are ok. Check the Transformer left and right center pins for a signal. If ok, the panel is defective due to a backlight failure. If the pulse is missing on one side (L or R center legs) of the transformer, the power supply is defective.If there is no backlight activity, confirm the Fuse F700 has approx. 300V on both sides. If only on one side, check fuse for open. If there is no 300V, replace the Power Supply.If 300V DC is present, observe the L and R center legs on the left hand side of ballast transformer T701. Look for 58Khz pulse at 8.7V p/p. If yes, confirm the connectors to backlight are ok. If ok, then the panel is defective. If no pulse is found, replace the Power Supply.BACklIGhT vOlTAGES
Caution backlight peak-to-peak over 1KV (Freq. 54Khz). Pins 1 and 2 are actually shorted together (Either plug). Reading between P401 and P402 reads the Transformer T701 (0.1V).
P401 and P402 BacklightsPin STBY Run Diode Check1 0V >1Kac 0V2 0V >1Kac 0V
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
INV
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
P23 17 511 915 1319 1723 21
4 28 612 1016 1420 1824 22
+5VPWR
10K
INV
Fall 2008 LCD Training 49
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Fall 2008 LCD Training 49
CIRCUIT DeSCRIPTIONSCONTROL BOARD LAyOUT
To LCD Driver (T-CON)
P104P103
P101LVDS
P102To Main
Control Board Regulators
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50 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONSLocking Tabs
Press In Press In
lvDS CABlELVDS stands for Low Voltage Differential Signals. The LVDS cable carries video signals from the Main board to the Control board Their signals can be confirmed with the Oscilloscope by monitoring the LVDS signals with no input signal selected while pressing the Menu button on and off with the remote control or keypad. Loss of these signals would confirm the failure is on the Main board. To remove the connector, press the two outside tabs inward and pull.
CONTROl BOARD CRYSTAl TEST
The Control board contains the MICRONAS chip IC101. This IC is a Full-HD Rate Converter with Motion Blur Removal and Film De-Juddering for 1080p 100/120 Hz LCD panels. It features:
Vector based motion compensation Dual 10 bit LVDS input Quadruple 12 bit LVDS output
1.7 Vp/p20.25 Mhz
(Only when set is on)
Fall 2008 LCD Training 51
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Fall 2008 LCD Training 51
CIRCUIT DeSCRIPTIONSLCD DRIveR (T-CON) LAyOUT
CN1
To LCD Panel
To Control Board
CN2
CN5 CN4
U15
U16
UC1
F1
US1
LD1
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52 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONSlCD DRIvER (T-CON) TESTS
Check Fuse F1 for 12V.
Check the regulator US1 for correct voltage.
LD1 1.8V
US10V
3.2V
Use LD1 to determine if The boot up sequence of The T-CON is OK. If all is OK, this LED will turn bright blue shortly after power is applied then go out shortly after backlights illuminate .
F1
CN1
LCD Driver LED StatusPower Off Power 1st On Power On Anode 0V Anode 11.6V Anode 11.6V
Cathode 0V Cathode 0V Cathode 9.5VLED OFF LED ON LED OFF
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Fall 2008 LCD Training 53
CIRCUIT DeSCRIPTIONSMAIN BOARD LAyOUT
If odd video problems are found, use some freeze spray on IC100 and its circuits.If the video returns to normal, the board needs to be replaced.
P801Power Supply
P800 P900
To Control Board
P401To Control Panel
P501To Speakers
P200[Empty]
IC100
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CIRCUIT DeSCRIPTIONSMAIN BOARD UNDERSIDE
IC4053.29V
0V0.6V
3.31V0V
0.6V
123
SBY RUN IC8100V0V
0.3V
0V1.8V
3.31V
123
SBY RUN
BCM ResetIC100
Video Processor
IC4000.4V
0V0.4V
3.37V0V
3.39V
123
SBY RUN IC805 0.V0V0V
0.4V0.1V
3.3V BCM5V0V
3.39V1.2V
12345
IC8020V
0.3V0V
5V3.3V
0V
123
SBY RUN
IC101
Use the left side of L206
Micro Crystal
Video Crystal
(Only when set is on)
780 mVp/p54 Mhz
(Set is on or o)
2.4 Vp/p24 Mhz
MAIN BOARD CRYSTAl ChECk
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Fall 2008 LCD Training 55
CIRCUIT DeSCRIPTIONSMAIN BOARD lD803 ChECkUse LD803 as a visual aid. This lets you know if the +5V is being converted to 3.3V for the BCM chip IC100. If LD803 is illuminated, +3.3V is ok. Only half of the dual LED is used.
MAIN BOARD TUNER ChECkFor easy access, pop the shield off the tuner. If you leave the shield on you can still access the same pins, but be careful not to accidentally ground out your test lead on the shield. Note: This is a picture from a different model, but the concept is the same.
Pin 14 Audio SIF
Pin 16 Composite Video
Pin 14 Pin 16
Pin 3 Tuner B+ (5V)
MAIN PWB
LD803
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56 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONS
Pin 16 Video Signal
Pin 14SIF Signal
17
161514
1312
11
10
987
6
54
3
2
1
TDVF-H051FEBL37676801
NC_1RF-AGC
+B (5V)
VTU
NC_2GND
SDASCL
ASDIGITAL_IF1DIGITAL_IF2
IC_AGC
AUDIO_OUTSIF
IF_ASVIDEO_OUT
Shield
Not UsedNot Used
Not UsedNot Used
Not Used
Not Used
Not Used
850mVp/p 20nSec rate
1Vp/p 20uSec rate
MAIN BOARD lvDS P900 ChECkTo confirm that the Main board is outputting Picture Content signals, check P900 (LVDS) cable for output. Check 11-22 and 27-38. This signals vary, but looking for signals like the ones shown below on any of these pins will confirm the output of video content. This signal is using a standard SMTE Color Bar output from a generator as the input source. Below is just a sample of two pins on the LVDS. There are 24 pins carrying video.
Test the waveforms while using a SMTE color bar signal as the input.
P900Location
MAIN PWB
Pin 11
Pin 16
Fall 2008 LCD Training 57
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Fall 2008 LCD Training 57
CIRCUIT DeSCRIPTIONSMAIN BOARD CONNECTORS
Resistance taken in Diode Mode with connectors removed.
P900 Main to P104 ControlPin Stby Run Diode Pin Stby Run Diode 1 0V 11.7V OL 2 0V 11.7V OL3 0V 11.7V OL 4 0V 11.7V OL5 0V 0V Gnd 6 0V 0V Gnd7 0V 0V Gnd 8 0V 0V Gnd9 0.47V 3.3V 1V 10 0V 3.3V 1V11 0V 1.14V 1V 12 0V 1.14V 1V13 0V 1.11V 1V 14 0V 1.11V 1V15 0V 1.12V 1V 16 0V 1.05V 1V17 0V 1.11V 1V 18 0V 1.11V 1V19 0V 1.16V 1V 20 0V 1.07V 1V21 0V 1.14V 1V 22 0V 1.05V 1V23 0V 0V OL 24 0V 3.25V 1.28v25 0.5V 3.15V 2.98V 26 0V 3.3V 3V27 0V 1.14V 1V 28 0V 1.14V 1V29 0V 1.12V 1V 30 0V 1.09V 1V31 0V 1.14V 1V 32 0V 1.07V 1V33 0V 1.07V 1V 34 0V 1.13V 1V35 0V 1.16V 1V 36 0V 1.07V 1V37 0V 1.16V 1V 38 0V 1.07V 1V39 0V 0V OL 40 0V 0V Gnd
Switched LVdS 12V
ScL
Video SignaL
n/c
Sda
FRc ReSet
Video SignaL
n/c
P501 Main to Speakers
Pin Stby Run Check1 0V 8V 2.58V2 0V 8V 2.58V3 0V 8V 2.58V
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58 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONSP801 Main to P2 SMPS
Odd Label Stby Run Diode Check Even Label Stby Run Diode Check1 16V 0V 16V 0.94V 2 16V 0V 16V 0.94V3 Gnd Gnd Gnd 0V 4 Gnd Gnd Gnd 0V5 12V 0V 11.8V 1.32V 6 12V 0V 11.8V 1.32V7 Gnd Gnd Gnd 0V 8 Gnd Gnd Gnd 0V9 5V 5V 5.15V 1.49V 10 5V 5.15V 5.15V 1.49V11 5V 5V 5.15V 1.49V 12 5V 5.15V 5.15V 1.49V13 Gnd Gnd Gnd 0V 14 Gnd Gnd Gnd 0V15 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V17 ERR 3.19V 3.3V OL 18 ACD 4V 4.57V 1.85V19 PWR 0V 2.86V OL 20 INV 0V 3.29V OL21* ADIM 0.1V 1.68V OL 22 PDIM 0V 3.38V OL23 SEL 0V 3.2V OL 24 SYNC 0V 0V OL (Not Used)
* ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%
P401 MAIN to Front KeysPin Stby Run Diode Check1 3.25V 3.25V 2.26V2 3.25V 3.25V 2.26V3 0V 0V Gnd4 0V 0V Gnd5 3.3V 3.3V 1.85V6 3.3V 3.3V 1.85V7 3.3V 3.3V 0.71V8 5V 5V 1.47V9 0V 0V Gnd10 3.92V 3.92V 1.35V11 0V 0V OL12 0V 0V Gnd13 0V 0V OL14 0V 0V OL15 0V 0V Gnd
P800 Main to P102 ControlPin Stby Run Diode Check1 0V 5V 0.8V2 0V 5V 0.8V3 0V 0V Gnd4 0.5V 3.3V 0.55V5 0V 0V Gnd6 0V 16V OL7 0V 16V OL8 0V 0V Gnd9 3.3V 3.3V 1.39V10 3.3V 3.3V 1.28V11 3.3V 3.3V 1.24V12 3.3V 3.3V 1.29V13 3.3V 0V 1.35V
Fall 2008 LCD Training 59
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Fall 2008 LCD Training 59
CIRCUIT DeSCRIPTIONS
P401 MAIN to Front KeysPin Stby Run Diode Check1 3.25V 3.25V 2.26V2 3.25V 3.25V 2.26V3 0V 0V Gnd4 0V 0V Gnd5 3.3V 3.3V 1.85V6 3.3V 3.3V 1.85V7 3.3V 3.3V 0.71V8 5V 5V 1.47V9 0V 0V Gnd10 3.92V 3.92V 1.35V11 0V 0V OL12 0V 0V Gnd13 0V 0V OL14 0V 0V OL15 0V 0V Gnd
FRONT lED & POwER TOUCh
J1
Front PWBAssembly
To Main
FRONT CONTROl ASSEMBlYThe Intelligent Sensor and IR Sensor are located on the front of this board.
J3
J2
J1
To Front Touch LED PWB
To Main PWB
To Side KeyControl PWB
Right Tweeter
Light Diffuser for the Intelligent Sensor
Light Diffuser for the Intelligent Sensor
IR Sensor
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60 Fall 2008 LCD Training
CIRCUIT DeSCRIPTIONS
CONTROl PANEl vOlTAGES
J2 Ft Control to J1 LED J1 Front Keys to Main P401Pin Stby Run Pin Stby Run 1 3.3V 3.3V 1 3.25V 3.25V2 3.3V 3.3V 2 3.25V 3.25V3 5V 5V 3 0V 0V4 0V 0V 4 0V 0V5 0V 0V 5 3.3V 3.3V6 0V 0V 6 3.3V 3.3V7 3.3V 3.3V 7 3.3V 3.3V8 0V 0V 8 5V 5V9 3.3V 3.3V 9 0V 0V
10 3.92V 3.92VJ3 Ft Control to P100 Side Ctrls 11 0V 0V
Pin Stby Run 12 0V 0V1 3.3V 3.3V 13 0V 0V2 0V 0V 14 0V 0V3 3.3V 3.3V 15 0V 0V4 0V 0V
To FrontControl PWB
P100
SIDE CONTROl PANEl
Fall 2008 LCD Training 61
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Fall 2008 LCD Training 61
CIRCUIT DeSCRIPTIONSINvISIBLe SPeAkeR SySTeM LAyOUT
RightTweeter
LeftTweeter
Right Speaker Box
LeftSpeaker Box
ToTweeters
Speaker BoxRemoved
Fall 2008 LCD Training
PDP Training - Fall 2008 67 Schematics 67
32LG40
32LG40 :: InterconnectSchematics
P401
LD800
MCN1
54 Meg
24 Mhz
Reset
Grayed Out ICs are located on Back
X400
X200
IC809
IC400
*
32LG40 INTERCONNECT DIAGRAM
P800
P901
P900
P904
J2 J1
BallastPower Supply
Main (Digital) Board
T-CON Board
Front PWB Assembly(Interface)
Side
(Key
) Con
trol
s
P200
P500
A/C In
P203
P201P202
SoftwareUpgrades
F101
F100
To Backlight
To Backlight
Right Side
Left Side
CN1
SC100
L
N
A/C Fuse5A / 250V
380 Fuse3.15A / 250V
F124V
8A / 150V
IR ReceiverPower Button
To Speakers
P101
P902 Pin 11
P201 Even "SMPS" to P800 "Main PWB"Pin Label STBY Run Diode Check Pin Label STBY Run Diode Check1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V9 5.2V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V11 5.2V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V13 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd17 ERR 0V 3.3V 1.26V 18 ACD 5.05V 4.57V OL19 PWR 0V 2.86V OL 20 INV-On/Off 0V 3.29V OL21 BR1 0.1V 1.68V OL 22 PWM-DIM 0V 3.38V OL23 N/C 0V 3.2V OL 24 N/C 0V 0V OL
P201 Odd "SMPS" to P800 "Main PWB"
P203 "SMPS" to P209 "Ballast PWB"Pin Label STBY Run Diode Check1 24V 0V 24.52V 0.33V2 24V 0V 24.52V 0.33V3 24V 0V 24.52V 0.33V4 24V 0V 24.52V 0.33V5 24V 0V 24.52V 0.33V6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd10 Gnd Gnd Gnd Gnd11 BR1 1.67V OL12 INV On-Off 3.45V OL13 PWM-DIM 3.40V OL14 ERROR 0V OL
BSM
0V0V0V0V
5.15V5.15V
IC806
IC801
IC807
TUNER
IC803
IC00BCM
P902
IC80
8
Q901
IC401
IC805
Far left and right pins are not counted, they are ground.
F1 6.3V/1.5A
US2
12V
3) 0.0V2) 1.8V1) 3.3V
IC802
Q400IC405
Q900
IC801
LD1Ballast
Drive LED
ExampleOf LVDS
Signal
IC201 IC405 IC806 Q801PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN2 IN +5V 0V 5V 1 IN 3.3V_MICON 3.41V 3.41V 1 On/Off Control Power_CTL_3.3V 0V 3.4V 1,3 IN ST_5V 0V 5V3 On/Off Control BCM DDR Power 0V 3.4V 2 Gnd Gnd Gnd Gnd 2 IN +5V_SUB 0.36V 5V 2,4 On/Off Control Q802 0V 0.28V7 OUT USB_PWR_Out_1 0V 5V 3 OUT Reset (Lo-Hi) 0.6V 0.6V 3 Gnd Gnd Gnd Gnd 5,6,7,8 OUT +5V_SUB 0V 5V8 OUT +3.3V 0V 3.1V IC802 4 OUT D3.3V_BCM 0.1V 3.4V Q802
IC304 PIN FUNCTION NAME STBY RUN IC807 PIN FUNCTION NAME STBY RUNPIN FUNCTION NAME STBY RUN 1 Gnd +3.3V 0V 5V PIN FUNCTION NAME STBY RUN B On/Off Control RL_ON 0V 3.29V3,8 OUT DDRO_VTT 0V 1.29V 2 OUT Gnd Gnd Gnd 1 IN +9V 0V 8.9V C Pull Down ST_5V 0V 5V
5,6,7 IN D2.6V_BCM 0V 2.6V 3 IN +5V_SUB 0V 3.2V 2 On/Off Control Power_CTL_3.3V 0V 3.4V E Gnd Gnd Gnd Gnd4 On/Off Control DDRO_VTT 0V 1.29V IC803 3 OUT +5V 0V 5V Q400
IC400 PIN FUNCTION NAME STBY RUN 4 n/c n/c n/c n/c PIN FUNCTION NAME STBY RUNPIN FUNCTION NAME STBY RUN 1 IN +12V 0V 12V 5 Gnd Gnd Gnd Gnd B Reset Reset 0.6V 0.6V1 IN D3.3V_BCM 0V 3.4V 2 Gnd Gnd Gnd Gnd IC809 C Vcc 3.3VVST_MICON 0V 0V2 Gnd Gnd Gnd Gnd 3 OUT +9V 0V 9V PIN FUNCTION NAME STBY RUN E Gnd Gnd Gnd Gnd3 OUT Reset (Lo-Hi) 0V 3.39V 6,7,8,10 IN +5V_SUB 0.36V 4.98V
17 On/Off Control Power_CTL_2.6V 0V 3.41V1,2,3,4,5 OUT D2.6V_BCM 0V 2.66V
14,15 n/c n/c n/c n/c11,18,19,20 Gnd Gnd Gnd Gnd
5V SUB SWITCH
5V SUB SWITCH CONTROLLER for Q801
RESET GENERATOR FOR MICRO IC407RESET GENERATOR TO IC401 (On Back)
RESET GENERATOR FOR Q400
2.6V BCM+3.3V Regulator (3.3V TMDS_SW)
USB Power
+9V Regulator
D3.3V/A3.3V_BCM Regulator turns on LD800
D3.3V_BCM Regulator (Also A3.3V_BCM)
D2.6V_BCM Regulator (Also A2.6V_BCM)
IC401 IC808PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN14 IN D3.3V_BCM 0V 3.41V 2 IN ST_5V 5V1 On/Off Control Reset from IC400 0V 3.4V 3 OUT 3.3VST_MICON 3.43V6 OUT BCM_RESET 0V 3.4V 4 Gnd Gnd Gnd Gnd
IC801 Q900PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN1 Gnd Gnd Gnd Gnd B Control LVDS_PANEL_CTRL 0V 0.75V2 OUT +1.8V_NTP 0V 1.8V C Pull Down 12V LVDS Switch Control 0V 0V3 IN 3.3V_TMDS_SW 0.26V 3.29V E Gnd Gnd 0V 0V
IC805 Q901PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN
6,7,8,10 IN +5V_SUB 0.38V 5V 1,3 IN 12V 0V 12.36V17 On/Off Control Power_CTL_1.2V 0V 3.41V 2,4 On/Off Control Q900 0V 6.16V
1,2,3,4,5 OUT D1.2V_BCM 0V 1.29V 5,6,7,8 OUT LVDS 12V 0V 12.36V13, 14,15,16 n/c n/c 0V 0V
11,12,18,19,20 Gnd Gnd Gnd Gnd
Screen Print for Pin No is incorrect, use IC
LVDS 12V SWITCH
LVDS 12V SWITCH CONTROLLER Q901
BCM RESET
+1.8V_NTP REGULATOR
D1.2V/A1.2V BCM REGULATOR
ST-BY 3.3V DC-DC CONVERTER
5V3.43V
REGULATORS/ICs ON BACKREGULATORS/ICs ON FRONT
CN2 CN3
TO TFT MODULE
To Force Power Supply On.Disconnect P800 on Main PWB.Jump 5V to pin 19.Ballast and All voltages should turn on.
DVD Drive
CN400
CN401
CN403
CN402
Not Used
PDP Training - Fall 2008 68 Schematics 68
32LG40
32LG40 :: WaveForms
32LG40 LVDS P902 WAVEFORMS
32LG40 LVDS CABLE WAVEFORMS:Waveforms taken using SMTP Color Bar input.All readings give the Scale and Time Base related to scope settings. Top waveform in each image gives a slower rate.10mV at 5uS per division.Bottom waveform shows a blow up sample. 10mV at 2uS per division.
PDP Training - Fall 2008 69 Schematics 69
32LG40
32LG40 :: maIn Board :: maIn mIcro
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 70 Schematics 70
32LG40
32LG40 :: maIn Board :: audIo
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 71 Schematics 71
32LG40
32LG40 :: maIn Board :: memory
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 72 Schematics 72
32LG40
32LG40 :: maIn Board :: Bcm/usB
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
Side USB
PDP Training - Fall 2008 73 Schematics 73
32LG40
32LG40 :: maIn Board :: dcm
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 74 Schematics 74
32LG40
32LG40 :: maIn Board :: Lvds/dvd
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 75 Schematics 75
32LG40
32LG40 :: maIn Board :: tuner PoWer
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
The symbol refers to safety components. Only replace with LG parts.
PDP Training - Fall 2008 76 Schematics 76
32LG40
32LG40 :: maIn Board :: JackPacks
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
PDP Training - Fall 2008 77 Schematics 77
32LG40
32LG40 :: maIn Board :: HdmI
Cop
yrig
ht
2008
LG
Ele
ctro
nics
. Inc
. All
right
rese
rved
. O
nly
for t
rain
ing
and
serv
ice
purp
oses
LGE
Inte
rnal
Use
Onl
y
HDMI 1
HDMI 2
PDP Training - Fall 2008 78 Schematics 78
42LG60
42LG60 :: Interconnect
P900P800
P401P501
P801
TUNERATSC/QAM/
NTSC
IC100BCM
IC302
IC300
IC303
IC301 IC404
IC1000
X200 (54Mhz)
IC800IC806
IC402
IC503
IC701
IC600 IC820
CN5 CN4
TFT-Drive (T-CON)CN1 CN2
P103 P104
CONTROL P102
P101
LVDS
POWER SUPPY J1J2
J1J3
P2
LVDS
Ft. TOUCHLED/Push Sw
SpkSpk
Ft. PWB Assy.
AC In
LeftBacklight
Plug
RightBacklight
Plug
TFT PANEL
IC101IC103
IC102
IC108 IC109 IC110
5 (2.5V)4 (0V)3 (0V)2 (3.3V)1 (3.37V)
5 (0V)4 (1.79V)3 (0V)2 (3.36V)1 (3.29V)
5 (1.2V)4 (1.3V)3 (0V)2 (3.37V)1 (3.29V)
X10120.25Mhz
UC1LD1U15
U16
US10V
3.2V 1.8V
3A 125V11.6V
SET 0FFLED OFF
SET ONLED OFF
LD1 Blue LED TFT Drive PWB Check
AnodeCathode
0V0V
BOOT OKLED ON
AnodeCathode
11.6V0V
AnodeCathode
11.6V9.5V
F1018A 250V
ACF700
5A 250V335V
Backlight pulse over 1000V p/p (54KhZ)
IC500
X400
IC407
The appearance of LD1 when the set is on appears to be lit dimly. However there is a small hole in the back panel frame and the
T-CON PWB that allows the backlight to make it appear lit.
Side Control Keys
MAIN PWB
P200Not Used
F1
IC900
IC807IC1201
IC304
IC1200IC202
LD8033.3V BCM
IC805OK LED
IC501
Pin 1 ~ 16
Q400E B
24Mhz
P2
3
1
7
5
11
9
15
13
19
17
23
21
4
2
8
6
12
10
16
14
20
18
24
22
10K
1st short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor.This turns on the power supply.2nd: To test the Backlights, jump Pin 20 (INV) to Pin 19 (PWR)Observe the Backlights.If normal, the backlights should turn on and off 4 times. Then they go off.If only the backlights light, (Right side or Left Side), confirm connectors are OK. If yes, panel defective.If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides.If on one side, check fuse for open. If no 300V, replace Power Supply.If 300V present, observe the center leg on the left hand side of ballast transformer T701. Look for 58Khz pulse at 8.7V p/p. If yes, confirm connectors to backlight OK, if OK, then panel defective.If no pulse, replace the Power Supply.
ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%*
P2 "SMPS" to P801 "Main PWB"
Pin Label STBY Run 1 16V 0V 16V3 Gnd Gnd Gnd5 12V 0V 11.8V7 Gnd Gnd Gnd9 5V 5V 5.15V11 5V 5V 5.15V13 Gnd Gnd Gnd15 Gnd Gnd Gnd17 ERR 3.19V 3.3V19 PWR 0V 2.86V21 *ADIM 0.1V 1.68V23 SEL 0V 3.2V
Pin Label STBY Run 2 16V 0V 16V4 Gnd Gnd Gnd6 12V 0V 11.8V8 Gnd Gnd Gnd10 5V 5.15V 5.15V12 5V 5.15V 5.15V14 Gnd Gnd Gnd16 Gnd Gnd Gnd18 ACD 4V 4.57V20 INV 0V 3.29V22 PDIM 0V 3.38V24 SYNC 0V 0V
Odd Pins Even Pins
IC109IC108 IC110
1 16
*Q901*Q902
*IC400
*IC802
*IC810
*IC405
*Grayed out components on the back
Function Pin Volts Function Pin Volts Name Function Pin Volts Function Pin VoltsIn from IC806 1 8.95V In 6,7,8,10 5V 1 0V Source C ST-5VOn/Off 2 3.3V Out 1,2,3,4,5 2.6V Out 2 3.3V Control B RL-ON (PWR)Out (+5V-TU) 3 5.0V On/Off 17 Power Control In 3 5V Gnd E 0Vn/c 4 0.0VGnd 5 0.0V
Function Pin Volts Function Pin VoltsIn 2 5V In 1 3.3VST-MICOM
Function Pin Volts Function Pin Volts Name Out 4 3.3V (A3.3V-BCM) Gnd 2 0.0VIn (+12V) 1 11.6V In 6,7,8,10 5V On/Off 1 Power Control-3.3V Out 3 Low to High to B Q400Gnd 2 0.0V Out 1,2,3,4,5 1.2VOut 3 9V On/Off 17 Power Control
Function Pin Volts Function Pin VoltsIn 3 3.3V from IC802 Source C 12V
Function Pin Volts Out 2 1.8V (+1.8V-NTP) Control B LVDS-Panel-Control1 0V Gnd 1 Gnd E 0V
Out 2 3.3V Function Pin Volts NameIn 3 5V In 3 5V ST_+5V
Out 2 3.3V Reset Function Pin Volts Function Pin VoltsGnd 1 0V Gnd In C ST-5V Source 1, 3 12V
Control B RL-ON (PWR) Control 2, 4 Low from Q902Gnd E 0V Output 5~8 12V
Q901 (On Back)12V LVDS On control to P900 Pins 1~4
IC404 uP 3.3V3.3VST-MICOM
IC404
IC806 IC8201.2V Switching Regulator A1.2V-BCM
Use L014 left side to test output
Q802 (On Back)5V Switch control to Q801
IC8072.6V Switching Regulator A2.6V-BCM
Use L801 left side to test outputUse any top pin of IC807 to test input
Use any top pin of IC820 to test input
9V Regulator
3.3V Regulator
Q801 (On Back)5V Switch
IC405 uP Reset (On Back)Reset by Charge of C431
IC802 (On Back)3.3V Regulator
Q902 (On Back)
FRONT SIDE OF MAIN PWB
IC810 (On Back)1.8V Switching Regulator +1.8V-NTP
3.3V Switching Regulator A3.3V-BCMIC805 (On Back)
IC800BACK SIDE OF MAIN PWB
5V Switching Regulator
12V LVDS control to Q901
Gnd
Gnd
0V
P100
See back side of page for Waveforms forP900 using SMTE Color bar as the Input.
Tuner Pin 16 SMTE Color bar In
uP5V Pin 3Video Pin 16Audio SIF Pin 14
TUNERBallastSection
*IC805
ResetBCM
P402
P401
Scope test point
Tweeter Tweeter
Pin 24 Pin 23
LG
PDP Training - Fall 2008 79 Schematics 79
42LG60
LVDS CABLE P900 FROM MAIN PWB TO CONTROL PWB P101 USING SMTP COLOR BAR INPUT
LAST TWO WAVEFORMS ARE FROM THE TUNER
Measurements +/- 5%
42LG60 :: WaveForms
PDP Training - Fall 2008 80 Schematics 80
42LG60
42LG60 :: maIn Board :: Bcm
PDP Training - Fall 2008 81 Schematics 81
42LG60
42LG60 :: maIn Board :: ddr memory
PDP Training - Fall 2008 82 Schematics 82
42LG60
42LG60 :: maIn Board :: maIn mIcroProcessor
PDP Training - Fall 2008 83 Schematics 83
42LG60
42LG60 :: maIn Board :: audIo Processor
PDP Training - Fall 2008 84 Schematics 84
42LG60
42LG60 :: maIn Board :: HdmI
PDP Training - Fall 2008 85 Schematics 85
42LG60
42LG60 :: maIn Board :: InterFace
PDP Training - Fall 2008 86 Schematics 86
42LG60
42LG60 :: maIn Board :: InterFace
PDP Training - Fall 2008 87 Schematics 87
42LG60
42LG60 :: maIn Board :: reGuLators
PDP Training - Fall 2008 88 Schematics 88
42LG60
42LG60 :: maIn Board :: Lvds/tuner
PDP Training - Fall 2008 89 Schematics 89
42LG60
42LG60 :: maIn Board :: audIo out
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