32LH30 PRESENTATION 32LH30 PRESENTATION Direct View LCD
Oct 24, 2014
32LH30 PRESENTATION32LH30 PRESENTATION
Direct View LCD
LCD DV 32LH302 Spring 2009
OUTLINEOUTLINE
• Main Board• T-CON Board
Circuit Board Operation, Troubleshooting of :• Switch mode Power Supply
Section 1
Section 2
Contact Information, Preliminary Matters, Specifications,LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages
• Ft Control Board
• Side Keys
LCD DV 32LH303 Spring 2009
32LH30 LCD Direct View Display
Section 1
This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.
Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked. These techniques will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and Layout of the LCD Display Panel.
At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Assembly.
Overview of Topics to be DiscussedOverview of Topics to be Discussed
LCD DV 32LH304 Spring 2009
IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. 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. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.
CAUTIONCAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an product could result in physical injury.
Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)
LCD DV 32LH305 Spring 2009
Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in the product. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.
Regulatory InformationRegulatory Information
This 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 the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.
ESDESD NoticeNotice (Electrostatic Static Discharge)(Electrostatic Static Discharge)
LCD DV 32LH306 Spring 2009
Also available on the Also available on the Plasma pagePlasma page
New Training Materials on New Training Materials on the Learning Academy sitethe Learning Academy site
CONTACT INFORMATIONCONTACT INFORMATIONCustomer Service (and Part Sales) (800) 243-0000
Technical Support (and Part Sales) (800) 847-7597
USA Website (GCSC) aic.lgservice.com
Customer Service Website us.lgservice.com
LG Web Training lge.webex.com
LG CS Academy lgcsacademy.com
LG Electronics Alabama, Inc. 201 James Record Road, Huntsville,
AL, 35813.
http://136.166.4.200
Published August 2009 by LG Technical Support and Training
32LG40, 32LH30, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG9042PG20, 42PQ20, 42PQ30, 50PG20, 50PS80, 50PS60
LCD-DV:PLASMA:
Plasma PanelAlignment Handbook
LCD DV 32LH307 Spring 2009
Safety and Handling Regulations
1. Approximately 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. (+/- ½ volt). 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.
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.3. Check details of defective condition and history. Example: Oscillator failure dead set, etc…
Checking Points to be Considered
LCD OverviewLCD Overview
LCD DV 32LH308 Spring 2009
Basic Troubleshooting StepsBasic Troubleshooting Steps
Define, Localize, Isolate and Correct
•Define 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.
LCD DV 32LH309 Spring 2009
This section of the manual will discuss the specifications of the 32LH30LCD Direct View Display Panel.
32LH30 Product Information32LH30 Product Information
LCD DV 32LH3010 Spring 2009
Basic SpecificationsBasic Specifications
Key Features• 32" Screen (31.5 diagonal) • 1080p HD Resolution • Two (2) HDMI™ (V.1.3 with Deep Color) • ISFccc Ready • Smart Energy Saving • LG SimpLink™• LG Core Technologies (32-inch and above) • Dynamic Contrast Ratio 50,000:1 • Response Time 6ms • Brightness 500 cd/m2 • Viewing Angle 178º H / 178º V • Life Span (Typical) 60,000 hr • Built-in Tuner ATSC/NTSC/Clear QAM • Cabinet Color Glossy Piano-Black • Limited Warranty 1 Year Parts/Labor
LCD DV 32LH3011 Spring 2009
SDEDHDHDHD
Interlaced2 Fields to make a Frame
ProgressiveEach Field is a Frame
Think of sync as the Panels “Refresh Rate”
Possible FrameRates:24FPS30FPS60FPS
FORMATS480I480P1080I720P1080P
InterlacedProgressiveInterlacedProgressiveProgressive
240 Lines480 Lines540 Lines720 Lines1080 Lines
Lines Per Field
FULL HD 1080p RESOLUTION Pixels: 1920 (H) x 1080p (V)
HD RESOLUTION 720p HD Pixels: 1366 (H) × 768 (V)
720P PANEL1365 (H) × 768 (V)
1080P PANEL1920 (H) x 1080 (V)
BASICPIXEL COUNTS
AND LOGOS
Panel Pixels (Lines of Resolution)Panel Pixels (Lines of Resolution)
LCD DV 32LH3012 Spring 2009
Basic Specifications (LOGO Familiarization) Page 1Basic Specifications (LOGO Familiarization) Page 1
Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture.
LCD DV 32LH3013 Spring 2009
TOP PORTION BOTTOM PORTION
Remote Control FamiliarizationRemote Control Familiarization
LCD DV 32LH3014 Spring 2009
Accessing the Service MenuAccessing the Service Menu
REMOTEBOTTOM PORTION
SIDE KEYS
To access the Service Menu.1) Turn the Set On2) Simultaneously, Press and
“Hold” the Menu Key on the Side Key pad and Press and “Hold” the Menu Key on the Remote approximately 5 seconds.
3) If Customer’s Menu appears, continue to hold until it disappears.
4) The Service Menu appears
Note: If a Password is required to enter the Service Menu. Enter;
0000
LCD DV 32LH3015 Spring 2009
Rear and Side Input JacksRear and Side Input Jacks
Main PWBRear Input Locations
Rear Input Jacks
USB Portfor Software
Upgrades Only
LCD DV 32LH3016 Spring 2009
1) Create an LG_DTV folder on the USB Flash Drive
2) Copy new software (xxx.epk) to "LG_DTV" folder. Make sure to have correct software file.
3) With TV turned on, insert USB flash drive.4) You can see the message
“TV Software Upgrade” (See figure to right)5) Cursor left and highlight "START" Button and
push “Enter” button using the remote control. 6) You can see the download progress Bar.7) Do not unplug until unit has automatically
restarted.8) When download is completed, you will see
“COMPLETE”. 9) Your TV will be restarted automatically.
USB Software DownloadUSB Software Download
Shows the Currently Installed Version
Shows the Software Version
found on the USB Flash
Drive
Shows the Software file found on the USB Flash
Drive
* CAUTION: Do not remove AC power or the USB Flash Drive. Do not turn off Power, during the upgrade process.
32LH30 PRODUCT DIMENSIONS32LH30 PRODUCT DIMENSIONS
17
7-7/8"200mm
2-5/16"58.4mm
31-1/2"800mm
Remove 4 screws to remove stand for wall mount
Model No.Serial No.Side Label
11-5/8"296mm
16-3/8"416mm
3-1/8"78.7mm
8-7/8"226mm
Center
3-15/16"100mm
Weight without Stand: 24.3 lbWeight with Stand: 27.6 lb
2-3/8"60mm
4-1/2"114mm
12 11/16"322.7mm
10 13/32"264.3mm
20-13/16"528.3mm
23-1.8"586.7mm
WattageAVG: 102WSTBY: >1W
LCD DV 32LH3018 Spring 2009
Disassembly:This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 32LH30 LCD Direct View Television.
Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printed circuit boards and be able to identify each board.
Troubleshooting:This section of the manual will also discuss troubleshooting.
Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems.
DISASSEMBLY AND TROUBLESHOOTING SECTIONDISASSEMBLY AND TROUBLESHOOTING SECTION
LCD DV 32LH3019 Spring 2009
Removing the Back Step (1)Removing the Back Step (1)
Remove the Stand byPulling it out of itsRetaining bracket.
Lay the TV down on its face. Remove the 6 screws around stand indicated by the arrows.
Notice the plastic support bar hidden behind the stand.
The back can now be removed.
Reinsert the stand and stand the unit
upright for service position.
Put one screw into the stand to prevent it from
falling out.
Remove
LCD DV 32LH3020 Spring 2009
The Stand has to be removed first.Remove the 23 screws indicated.
Pay attention to the size and type of screwas there are many different types.
Putting in an improper screw when reassembling may Cause damage.
The Stand must be removed before removing the back.
Removing the Back Cover Step 2 (Stand has to be removed)Removing the Back Cover Step 2 (Stand has to be removed)
LCD DV 32LH3021 Spring 2009
Circuit Board LayoutCircuit Board Layout
POWER SUPPLY
Main PWB
LVDSCable
T-CON Under Shield
Ft IR/LED Control
AC Input
RFInput
Speaker R
Rear Inputs
MasterPower Switch
Side Key
Speaker L
T-CON p/n: EAT60666401Ballast p/n: EAY60713901
BacklightConnections
BALLAST
LCD DV 32LH3022 Spring 2009
Power Power Supply PWB Supply PWB RemovalRemoval
Disconnect P201, P203, AC In SK100 and SK101.
Remove the 4 screws indicated by the arrows.
P201
AC In
SK100
P203
Do not have to be
released
SK101
Press inTwo tabsto release
lock
P201
LCD DV 32LH3023 Spring 2009
Power Supply (Master Power Switch) LocationPower Supply (Master Power Switch) Location
MASTER AC SWITCH
LOCATION(Bottom Left Side viewed from rear)
On Off
If the TV won’t come on, be sure
to check the Master Power Switch before assuming a failure has occurred.
LCD DV 32LH3024 Spring 2009
Power Supply (SMPS) PWB LayoutPower Supply (SMPS) PWB Layout
Hot Ground Shock Hazard
To MainP201
AC INSK100
F1005A/250V
AC IN
F5013.15A/250VRun 380V
STBY 168VFrom Hot Gnd
L
N
Pin 1 Pin 2
To BallastP203
ToMaster Power Switch
SK101
To Backlights
Ballast
T-CON PWB12V LVDS
Along with VideoOn LVDS cable
POWER SUPPLY (SMPS)
Inverter OnStarts the BallastBacklights Light
24V B+ for the BallastBridge
Stand By 5V
Power ButtonOr Remote Key
Reset ofMain Board
MAIN PWB
5V Switch
PWROn
12V VideoProcessing
InvOn
24VRegulator
12V/24V Regulators
Other Regs
StandBy 5V Reg
1
2 6 66 8
8
6
3
5
32LH30 POWER SUPPLYTURN ON COMMANDS FROM MAIN PWB
32LH30 POWER SUPPLYTURN ON COMMANDS FROM MAIN PWB
6
6
6Primary side fuse:
Stand-By 90VRun 370V
4
24V Audio
12V 24V
8
RegFor
Micro
LVDS12V
Switch12V
7
7
At point TV is in Stand-By state. Energy Star compliant.Less than 1 Watt
4
Other Circuits 5V General
BR1Fixed
AnalogDimming
PWM-DIMDigital
Dimming
Manipulates Backlights
Other C
ircuits
9
Cust Menu for Backlight
Picture Content
Power O
n
3
8
No AC Det in this
model
LVDS Panel ControlInv On/Off
Microprocessor IC100Also Video Processor
LVDSVideo
12V
Power On
AC In
25
Ft Control
24V
INV On
9
PWM-DIM (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.Manipulates the Backlight Brightness via the video processor. Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range
32LH30 P700 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT32LH30 P700 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT
R189
R185
1.2K
INV ON/OFF
PWR ON
100
R714
R704
C711150pF
C1811uF
P700
12V12V
Gnd
Gnd
Gnd
Gnd
0V
3.38V
4.98V
1.8V
PWR On
P201
ERR Out
PWR
A.DIMINV.On
PWM-DIM
n/c
SMPS
AB12
IC100Mstar
PWM2
PWM0
100
n/c
GndGndGndGnd
A-DIM (Analog Dimming) Fixed Value.
100
H5R245100
GPIO137SBY5V
MAINPWB
5V
5V5V5V
GndGnd
12V
2
1
4
3
6
5
8
7
10
9
11
12
14
13
16
15
18
17
20
19
22
21
23
24
2
1
4
3
6
5
8
7
10
9
11
12
14
13
16
15
18
17
20
19
22
21
23
24
21.3V24V
GndGnd
GndGndGndGnd
n/c n/c
n/c n/c
E5 GPIO 134L706
L70424V
C72168uF
C72768uF
L70712V
C7200.1uF C722
47uF
L701
Q701R703R706
R237
G5R719 1KΩ
Q702
R759 0Ω
R717 3.3KΩ
GPIO 136R244 100Ω
+5V General
Power On
Inverter On/Off
3
1
2
6
5
8
7
Q706
+5VL715
+5V GeneralL714
LVDS 12V Panel PowerL728
Q703 R237 100Ω
0.2V
6V
0.6V
4Q704Q705
LVDS Panel Control
L708
R25310KΩ
0V0.6V
12VR739 47KΩ
R740 47KΩ
AB13
PWM-DIM (Digital Dimming)
C726220uF STBY5V
L700
R743
0
L733
Relay On
A-DIM
P-DIM
3.3V-ST
STBY5V
4.7K C1821uF
C7251uF
C7061uF
21.3V
3.8V
10K10K
26
LCD DV 32LH3027 Spring 2009
Power Supply (SMPS) PWB Operational TroubleshootingPower Supply (SMPS) PWB Operational Troubleshooting
Power Supply Troubleshooting
Ac voltage is supplied to the Power Supply at Connector SC100. This set does not use AC Detect. The AC input generates a Hot Ground primary power supply that runs in two states, Stand-By (168) and Run (380V) measured at Fuse F501. This primary voltage develops all other voltages that are output from the power supply. During Stand-By, the 5 Volt Standby should be present at connector P201, Pins7,8,9 or 10. If Missing remove AC Power and unplug Connector P201, apply AC Power and recheck for presence of 5 Volt Standby. Loss of 5 Volt Standby would be a Power Supply Failure. Presence of 5 Volt Standby would be an indication of a failure on the Main Board or possibly the Front PWB (IR) assembly. Suspect a possible short circuit loading the supply. Remember to observe the Front Power Indicating LED this may save some time. A lit LED indicates the Stand-By 5V voltage is present!
The Main Board sends two commands to the Power Supply Board one being PWR the other is INV ON. These two voltages are used to control the power on turn on sequence. First via PWR (Pin 2) also known as POWER ON, activates the Ballast voltage 24V and the 17 Volt and 12 Volt lines to the Main board. The 2nd command is INV ON (P201 pin 20). It is the Lamp Lighting Command Signal. If either command (PWR-ON or INV-ON) is missing it will result in a no picture symptom, as the backlights will not turn on.
These voltages can easily be checked with the volt meter! Remove AC Power, unplug the Connector to the Ballast P203. Reapply AC Power and press the ON-OFF Button on either the Remote Control or Power Button on the Unit. Watch for the Power ON LED to change color from red to blue. This is an indication the PWR Signal was created on the the Main board. Check P700 or P201 pin 2 for the PWR-ON command (4.9V) to the Power Supply. Check P201 for 24V (Pins 17 or 18) and 12V (Pins 13 or 14). Confirm Pin 20 of P201 went to 3.3V. This is the INV ON signal needed to light the Lamps.Problems with either voltage can be easily solved by following the simple steps on the next page.
LCD DV 32LH3028 Spring 2009
TEST 1 Power Supply PWB Low Voltage TestTEST 1 Power Supply PWB Low Voltage Test
AC Should not be applied at any time while adding resistors or while unplugging connectors as damage to the circuit PWB may occur.
a) The SMPS PWB “MUST” be producing STBY 5V on either pin 7, 8, 9 or 10 (5V).
If 5V Standby is not being generated, the SMPS PWB is defective and must be replaced. There is no need to continue with the next test.
(b) Unplug P700 on the Main PWB and P203 to the Ballast.
TEST 1:
(1) Add a 10K resistor between (5V STBY) pin 7, 8, 9 or 10 and Pin 2 (PWR). Apply AC. This will turn on the power supply.a) Check that the 24V and 12V power supplies are
turned on, P201 (24V pins 17 and 18) (12V pins 13 and 14) and 24V to the Ballast P203 Pins 1~5.
(2) Remove AC power. Reinsert the plug P203 to the Ballast.
Use P700Side to insert
resistors
LCD DV 32LH3029 Spring 2009
Continue if the 1st test was successful. Leave original 10K resistor in place.
(3) Add another 10K resistor between (5V) pin 7, 8, 9 or 10 and Pin 20 (INV On).
(4) Apply AC Power. This simulates a Power On and Backlight On command.
Backlights Normal:a) If normal, the backlights should turn on.
Backlights Abnormal:b) Recheck connector P203 and confirm 24V on pins 1~5.
1) If low or missing, use diode mode to check the 24V line on Ballastconnector CN1. If low, this indicates a shorted output FET).
2) If open, check the Ballast Fuse, possible Open.c) Confirm the INV On/Off line P203 Pin 10 is going to 3V.
REMOVE AC POWER:d) Check the connections to the Backlights. DO NOT check these when AC
is applied as they carry 1.2Kv each.
TEST 2 Power Supply PWB Backlights TestTEST 2 Power Supply PWB Backlights Test
P700 Connector disconnected from the Main PWB.Apply AC after adding jumper.
Use P700Side to insert
resistors
LCD DV 32LH3030 Spring 2009
Power Supply Connector P201 Voltage and Diode CheckPower Supply Connector P201 Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
Open4.99V0VPWR-ON2
GndGndGndGnd4
GndGndGndGnd6
Open5.14V5.14V5V8
Open5.14V5.14V5V10
GndGndGndGnd12
Open12.3V0V12V14
GndGndGndGnd16
0.73V24.8V0V24V18
Open4.67V0VINV.ON20
Open0V0VErr Out22
Open3.2V0V2PDIM24
Diode CheckRun STBYLabelPin
P201 Even "SMPS" to P700 "Main PWB"
ncncncnc1
GndGndGndGnd3
GndGndGndGnd5
Open5.14V5.14V5V7
Open5.14V5.14V5V9
GndGndGndGnd11
Open12.3V0V12V13
GndGndGndGnd15
0.73V24.8V0V24V17
ncncncnc19
Open1.66V0V1BR121
ncncncnc23
Diode CheckRun STBYLabelPin
P201 Odd "SMPS" to P700 "Main PWB"
1 BR1 (A-DIM) Pin 21 Fixed and not used 2PDIM Pin 24 can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the video processor chip.
LCD DV 32LH3031 Spring 2009
Power Supply P203 to Ballast CN1 Voltage and Diode CheckPower Supply P203 to Ballast CN1 Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
Open0V0VError14
Open3.40V0VVBR_B13
Open3.45V0VOn/Off12
Open1.67V0VVBR_A11
GndGndGndGnd10
GndGndGndGnd9
GndGndGndGnd8
GndGndGndGnd7
GndGndGndGnd6
0.729V24.52V0VVBL5
0.729V24.52V0VVBL4
0.729V24.52V0VVBL3
0.729V24.52V0VVBL2
0.729V24.52V0VVBL1
Diode CheckRun STBYLabelPin
P203 "SMPS" to CN1 "Ballast"
LCD DV 32LH3032 Spring 2009
Power Supply Connector SK100 and SK101 Voltage and Diode CheckPower Supply Connector SK100 and SK101 Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
AC Voltage Readings Across Pins 1 and 2 for STBY and RUN.
OLN2
OL120Vac
L1
Diode CheckRun STBYLabelPin
AC Voltage Readings for either pin 1 or pin 2 in STBY and RUN with one lead on Neutral of SK101.
OLn/a2
OL120Vac
n/a1
Diode CheckRun STBYLabelPin
SK100 "SMPS" to AC IN SK101 "SMPS" to MASTER POWER SWITCH
SK101
SK100
Bottom Right of SMPS
Live
Neutral
With the Master Power Switch Closed (On) AC flows.When Open (Off) AC open and does not flow.
LCD DV 32LH3033 Spring 2009
Ballast Board
The Ballast receives it B+ from the Switch Mode Power Supply. 24V (CN1 pins 1~5) is delivered when the “Power On” command arrives at the SMPS.
The Backlights are turned on with the “Inverter On”command arrives. INV-ON is sent from the Main board through the SMPS to the Ballast.
The Backlights are manipulated by the control signal “P-DIM (Digital Dimming)” CN1 pin 13.
BALLAST SECTIONBALLAST SECTION
LCD DV 32LH3034 Spring 2009
General Backlight InformationGeneral Backlight Information
To Backlights Over 1.2KV
Currently, number of lamps “Unknown”
To Backlights Over 1.2KV
EEFL (External Electrode Fluorescent Lamp)LOW COST Large number of lamps driven by a single inverter
One Continuity path One Continuity path
Ballast
LCD DV 32LH3035 Spring 2009
Simple structure, Low price
Complicated structureSimple structure
Lamp manufacturing processLamp assembly structure
Low CostLarge number of Lamp Drive by single inverter
Introducing EEFLIntroducing EEFL
LCD DV 32LH3036 Spring 2009
Key: Long Life Time
• For CCFL, Hg gas is consumed mainly near the internal electrode• For EEFL, longer life time is expected because there is no internal electrode consuming Hg gas
EEFL Compared to CCFL ElectrodesEEFL Compared to CCFL Electrodes
LCD DV 32LH3037 Spring 2009
Ballast PWB Assembly (With Shield) LayoutBallast PWB Assembly (With Shield) Layout
CN1
To BacklightRight Side
To BacklightLeft Side
Transformers
Ballast Start Det LED (LED1)
F110A/125V
p/n EAY60713901
LCD DV 32LH3038 Spring 2009
Ballast PWB Assembly LayoutBallast PWB Assembly Layout
CN1
Ballast Start DetLED LED1
To BacklightRight Side
To BacklightLeft Side
Transformers
F110A/125V
WarningDo not Run the Ballast with Shield Removed.
LCD DV 32LH3039 Spring 2009
Ballast Transformer WaveformsBallast Transformer Waveforms
T1 or T2 Pin 6T1 or T2 Pin 1
34V p/p 48kHz22.2V p/p 48kHz
Transformers
PrimarySide
Warning, secondary is over 1.2Kv
FET Drivers WarningDo not Run the Ballast with Shield Removed.
16 16
T1 T2
IC100Mstar
32LH30 P700 on Main PWB To Power Supply P201 Out P203 To Ballast MCN132LH30 P700 on Main PWB To Power Supply P201 Out P203 To Ballast MCN1
R7430Ω
A-DIM
PWM-DIM
INV On/Off
3.29V
VBR-APWB-0
VBR-BPWM-2
GPIO 28
GPIO 27
20
24
21
P700
POWER SUPPLY
PWR2.86V
2
13
14
17
18
CN1
24V
BALLAST
12INV On/Off
1.67V
13
11BR1
PWM-DIM
ERR 0Vn/c (Not Used)
2214ERR
P201P203 MAIN PWB
20
24
21
22
2
5
4
12
13
11
3
14
E5 Relay On
R244 100Ω
R7590Ω
R7191KΩ
Q702
Inverter OnR703 10KΩ
R237 100Ω
R706 10KΩ
Stby 5V
Q701
G5
5V GeneralStby 5V7 8 9 10
12V
24V24VReg
14
17
18
13
21
24VReg
24V
12VReg
SMPSControler
2
5
4
1
3
L733
R7044.7Ω
L700
R189 100Ω
R185 1.2KΩ
AB12
AB13
VBR-A (Analog Diming) Manipulates the Backlight Brightness as well.But this line is not used.
PWM-DIM (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.Manipulates the Backlight Brightness via the video processor IC100. Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range
40
LCD DV 32LH3041 Spring 2009
Backlight Drive Signal Dimming Signal EffectsBacklight Drive Signal Dimming Signal Effects
PWMDIMmanipulates
the Burst Triangle
Oscillator in the ballast drive IC.
ADIM also manipulates
the Burst Triangle
OscillatorBut it is not
used.
LCD DV 32LH3042 Spring 2009
Ballast Removal (Heat Sink and Insulators)Ballast Removal (Heat Sink and Insulators)
Protects the Output FETs
Insulator
Insulator
Be sure to replace “All” heat sink materials and
insulators.
Cut Out
AlignmentNotch
Alignment Notch
Heat Transfer Material
Shield
p/n EAY60713901
Do not Runthe Ballast with ShieldRemoved.
Do not Runthe Ballast with ShieldRemoved.
LCD DV 32LH3043 Spring 2009
Ballast Connector CN1 Voltage and Diode CheckBallast Connector CN1 Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
Open0V0VError14
Open3.40V0VVBR_B13
Open3.45V0VOn/Off12
Open1.67V0VVBR_A11
GndGndGndGnd10
GndGndGndGnd9
GndGndGndGnd8
GndGndGndGnd7
GndGndGndGnd6
Open24.52V0VVBL5
Open24.52V0VVBL4
Open24.52V0VVBL3
Open24.52V0VVBL2
Open24.52V0VVBL1
Diode CheckRun STBYLabelPin
CN1 "Ballast" to P203 "SMPS"
LCD DV 32LH3044 Spring 2009
LCD Controller BoardThe T-Con IC UC1 receives from the Main Board LVDS at CN1 12 Bit
LVDS Signals (Video) which it processes into TFT Drive Signals which through connectors CN3 and CN4 controls the LCD Panel.
12V is supplied to the T-Con Board on connector CN1 from the Main Board(Easily measured at fuse F1 2A and 125V).
There are two DC to DC converters that create (17V developed at the cathode of D8).(3.3V developed at the cathode of D9). Protected by Fuses FL3 and FL4.
The 3.3V can also be measured at the ribbon connectors delivering signals to the TFT panel (CN3 pins 57, 58 or 59) and (CN4 pins 2, 3 or 4).
Also at the Regulator US2 the 1.5V can be checked. Protected by Fuses FL1 and FL2.
TT--CON (TFT DRIVE) SECTIONCON (TFT DRIVE) SECTION
LCD DV 32LH3045 Spring 2009
TT--CON (TFT Drive) PWB (With Shield)CON (TFT Drive) PWB (With Shield)Remove the 3 Screws in the T-CON shield and the 1 screw from the top of the vertical brace.
Remove the T-CON shield by sliding it left or right from under the vertical brace.
Note: There are Chocolate (Heat Transfer) material pieces underneath the T-CON Heat sink.
They dissipate heat from the UC1 and US3 ICs.Be sure to return these pieces when reinstalling
the Heat Sink (Shield).
LCD DV 32LH3046 Spring 2009
TT--CON (TFT Drive) PWB RemovalCON (TFT Drive) PWB Removal
Remember to reinstall the 3 screws for the Service Position if the T-CON board needs to be turned on for test purposes. These would already be removed when removing the shield.
CN4 CN3
CN1
Disconnect CN3, CN4 and CN1. See next slide for details.
UC1
US3
LCD DV 32LH3047 Spring 2009
To remove the flex cables to the TFT Panel, CN3 or CN4: Place a soft thin object like a fingernail underneath the black locking tab and gently pull forward.
(Shown by the arrows in Fig 1)
Fig 1
Fig 2
Unlocked
Flip the lock up and back from the flex cable. Then the flex cable can be easily removed. To remove the LVDS cable CN1;
Press in on the two tabs and slowly rock the cable out of the connector.
(Shown by the arrows in Fig 3)
Fig 3 (CN1) LVDS
UNLOCKING CN3, CN4 and CN1UNLOCKING CN3, CN4 and CN1
The locking tab is flipped upward
Press In Press In
Pull Out
CN3 or CN4 Locked
TT--CON (TFT Drive) PWB Removal ContinuedCON (TFT Drive) PWB Removal Continued
LCD DV 32LH3048 Spring 2009
TT--CON (TFT Drive) PWB (Shield Removed) Components IdentifiedCON (TFT Drive) PWB (Shield Removed) Components Identified
F1
CN4 CN3
CN1
UC1
To Main PWB
To TFT Panel To TFT Panel
Remember to replace screws for ground purposes if testing the PWB.
D9
T-CON p/n: EAT60666401
D8
US2
FL3/FL4
FL1/FL2 US3
LCD DV 32LH3049 Spring 2009
TT--CON (TFT Drive) PWB ChecksCON (TFT Drive) PWB ChecksT-CON PWB (Locations)
1.5V
3.3V
Gnd US2
Check the Regulator US2 for Correct Voltage
Check Fuse F1 for 12Vfrom CN1 Pins 48, 49, 50, and 51.
F1
CN1
Cathode 3.3V
D9
D8Cathode
17V
Check 1.5V Fuses
FL1 / FL2
Check 3.3V FusesFL3 / FL4
Check Fuse
F1 (12V)
Black band indicates Cathode
LCD DV 32LH3050 Spring 2009
TT--CON (TFT Drive) PWB Component Diode ChecksCON (TFT Drive) PWB Component Diode ChecksT-CON PWB (Locations)
0.35V[ 0.25V ]
0.68V[ 0.13V ]
Gnd
US2
Meter in Diode Mode, black lead on Gnd lug.
F1
CN1
Cathode 0.68V
[ 0.14V ]D9
D8Cathode
Open[ 0.61V ]
FusesFL1 / FL2
0.35V[ 0.25V ]
FusesFL3 / FL4
0.68V[ 0.14V ]
Fuse F13.18V
[ 0.57V ]
Black band indicates Cathode
Diode Check taken with meter in Diode Mode with all Connectors RemovedGndLug
GndLug
(-)
(+) Reading without brackets on TP
Reading in brackets [ ] on TP
NoGood
LCD DV 32LH3051 Spring 2009
TT--CON (TFT Drive) PWB Panel Voltage Development ChecksCON (TFT Drive) PWB Panel Voltage Development ChecksDiode Check taken with meter in Diode Mode with all Connectors Removed
GndLug
-7.26V
-3.24V
Gnd 25.7V
15.5V19.7V
D10 D11
16.9V
3.3V
D9
24.3V
3.3V
12VLVDS
Gnd
12VLVDS
12VLVDS
7.4V 7.4V
16.7V
7.4V 7.1V
Gnd
LCD DV 32LH3052 Spring 2009
CN4 CN3
T-CON PWB
TT--CON (TFT Driver) Board CN3 and CN4 (Panel Voltage Checks)CON (TFT Driver) Board CN3 and CN4 (Panel Voltage Checks)
16.9V 3.3V 16.9V 3.3V
-7.26VPin 5
24.3VPin 6
16.9VPins 55, 56
3.3VPins 58,59
-7.26VPin 56
24.3VPin 55
16.9VPins 5,6
3.3VPins 2,3
LCD DV 32LH3053 Spring 2009
TT--CON PWB LVDS Connector CN1 Pin IdentificationCON PWB LVDS Connector CN1 Pin Identification
1 51
CN1
12V forT-CON PWB
Not used on T-CON
Video Video
Video
Video
Video
Video
TA ClockTB Clock
10bit TA or 10bit TB
Resolution
32LH30 T-CON PWB LAYOUT32LH30 T-CON PWB LAYOUT
Warning:T-Con PWB under shield. Be sure to reinsert screws before operating set with shield removed.
(-5V)Pin 56
(24.3V)Pin 55
(16V)Pins 5,6
(3.3V)Pins 2,3
(-5V)Pin 5
(24.3V)Pin 6
(16V)Pins 55,56
(3.3V)Pins 58,59
63V/1.5A
CN4
US21 (0V)2 (1.8V)3 (3.3V)
UC1
D8
D9
L1
L2
3.3V
F1 (12V)
CN1 16.9V
FL1
FL2
FL3FL4
1.5V Fuses
3.3V Fuses
T-CON
CN3
16.9V 3.3VC110C115 3.3V
16.9V
24.3V
D10A
C
A
-7.26V
VDD
12V LVDS US3
FL7Gnd
FL8Gnd
Pins48-51
C84
3.3V
12V LVDS
R92
Pin 23,24
Pin 25,26
24V Pin 8
12V LVDS12V Pin 37,38
54
LCD DV 32LH3055 Spring 2009
TT--CON PWB Connector CN1 to Main PWB Voltage and Diode CheckCON PWB Connector CN1 to Main PWB Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
CN1 CONNECTOR "T-CON PWB“ to P800 "Main"789
10
1.95V0V0VLVDS-SELOpen*0V0VPWM-DIM1.75V0V0VOPC-OUT1.75V0V0VOPC-EN1.1V1.2V0VTXA4+1.1V1.1V0VTXA4-
1213
1.1V1.2V0VTXA3+1.1V1.1V0VTXA3-1.1V1.1V0VTXA0+1.1V1.2V0VTXA0-
14151617
1.1V1.2V0VTXA2+
1.1V1.1V0VTXA2-
1920
1.1V1.2V0VTXA1+1.1V1.1V0VTXA1-1.1V1.1V0VTXA0+1.1V1.2V0VTXA0-
32232425
*Pin 8 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%) Customer’s Menu Backlight setting. But is Not Used by T-CON.(See arrow on the T-CON PWB CN1 indicating pin 1)
1.1V3.24V0VBIT-SEL271.1V1.2V0VTXB4-1.1V1.2V0VTXB3+
29
1.1V1.1V0VTXB3-3031
1.1V1.1V0VTXBC+321.1V1.2V0VTXBC-331.1V1.1V0VTXB2+35
0.8V1.1V0VTXB0+1.1V1.2V0VTXB0-
1.1V1.2V0VTXB2-360.8V1.1V0VTXB1+381.1V1.2V0VTXB1-39
4041
3.18V12.1V0VLVDS 12V483.18V12.1V0VLVDS 12V493.18V12.1V0VLVDS 12V50Gnd12.1V0VLVDS 12V51
Pins 1, 11, 18, 21, 26, 34, 37, 42~46 are all GroundPins 1~6 and 47 has No Connection
LCD DV 32LH3056 Spring 2009
Main PWB IC100 Video Processor OverviewMain PWB IC100 Video Processor Overview
Input Signal Processing IC100 is the main Microprocessor and the main Signal Processor and is responsible for :
• ATSC, NTSC, and QAM reception and processing• RS 232 service only Port (software upgrades and home theater environment).• Wired Remote Port• (1) Component Input Y, Pr, Pb and Audio L R• (2) HDMI Inputs (back) (1) HDMI (Side Input) • RGB PC and (PC Audio)• USB (software upgrades using flash drive). USB located on the Rear.• AV Composite (1 Rear and 1 Side Input)• SIF and SAP
Output Signals
•20 Bit LVDS (20 Pin) to the T-CON Board• Audio output signals to the Speakers• Digital Audio Output Coaxial and Optical• ON OFF Controls to the SMPS turning on low voltage generation and Backlights• Backlight intensity control signal (Digital Dimming) P-DIM sent to the Ballast through
the SMPS.
LCD DV 32LH3057 Spring 2009
Removing the Main PWBRemoving the Main PWB
Remove any tape holding down any
cables.
Remove the remaining 4 screws indicated by
the arrows.
P800
P600 P1204
Flip the locking tabs upward, pull the LVDS ribbon out.
NOTE: Be sure to check on top and behind the Video Processor IC. Look for a piece of
Chocolate(Heat Transfer Material).
Be sure to transfer to new PWB if present.
P700
LCD DV 32LH3058 Spring 2009
Main PWB Main PWB LayoutLayout
VIDEO PROCESSOR IC100 RUNS HOT, THIS IS NORMAL.
1
19
LD1000 Tuner OK
when Green
P700 To
SMPS
P800
P1204
X100USB
TunerTU1001
To Front PWB Assembly
P800 to T-CON PWB
To Speakers
Look carefully on top and behind the Video Processor IC for Chocolate
(Heat Transfer) material. Be sure to transfer to new PWB if replaced.
For Software Upgrade via Jig
SW100Reset
X1005
P600
LD1000IC100
Microprocessor and
Video Processor
Q702
Q706
LCD DV 32LH3059 Spring 2009
Main PWB Main PWB (Back View)(Back View) Voltages given on the 11X17 foldout “Interconnect Diagram”
IC1003
IC1002
IC102IC601
IC702
IC1201
IC500IC501
IC1200
IC104
Q600
Q701
Q703Q704
Q705Q102
Q103
Q104
IC503
Q1000
Q1001D503
D500
19
1
D1223
D501D502
Q107
IC103
TUNERTU1001
IC7051.26V_VDDC
1 (0.78V)2 (Gnd)3 (5V)4 (5.9V)5 (5V)6 (1.3V)7 (1.3V)8 (3.16V)
MAIN (Digital) Board
To Speakers
Reset IC100
IC10048vsb/QAM
Q7061 (5V)2 (0.48V)3 (0.48V)4 (6V)5-6 (12.3V)7-8 (5V)
IC600Audio56 Pin
To SM
PS
PW
B
L726
L710
Q706 Switch(12V LVDS)(5V General)
X100525 Mhz
X10012 Mhz
IC1003
IC601
IC701
P600
P700
P1204
LD1000
To Front Control
IC105
IC7043.3V-FE1 (0.78V)2 (Gnd)3 (5V)4 (7.4V)5 (2.12V)6 (3.28V)7 (3.28)8 (5V)
IC7011.8V_DDR
1 (N/C)2 (3.18V)3 (3.18V)4-5 (N/C)6 (1.87V)7 (0.8V)8 (Gnd)
Q702Inv-On Control
Gnd0V(0.6V)
3.85V (0V)
IC1000
1.2V_PVSB1 (N/C)2 (3.2)3 (3.2V)4-5 (N/C)6 (1.2V)7 (0.8V)8 (Gnd)
IC105HDCP EEPROM
1-2 (Gnd)3 (5V)5-6 (0V)4-7 (Gnd)6 (1.2V)7 (0.8V)8 (5V)
IC101
Flash Memory1-2 (0V)3-4 (0V)5-6 (0V)7-8 (3.2V)
IC10035V-Tuner
source1 (12V)2 (Gnd)3 (8.94V)
IC1002
5V-Tuner1 (8.94V)2 (2.37V)3 (5V)4 (N/C)5 (Gnd)
IC702 (3.3V_ST)
1 (5V)2 (3.3V)3 (0V)
IC6011.8V Amp1 (3.2V)2 (1.8V)3 (0V)
IC107Power Det
1 (Gnd)2 (Reset) .3V3 (3.28V)
IC107
IC7043.3V_FE
IC7051.26V_VDDC
IC100Video
ProcessorMstar
P800
( ) = Off
IC702
Also, Main Micro
Q701PWR On5V (5V)
5V (0V)
0V (0.6V)
To T-CON (LVDS)
IC500 / IC501HDMI EDID
IC500 IC501
IC1200R,G,B PC/DDC
1
TUNER
16 SIF
19 Video
4 (5V)
12 DIF +13 DIF -
15 (5V)
Grayed Out ICs are located on Back*
E
C
BKEY
Main PWB Component IdentificationMain PWB Component Identification
60
LCD DV 32LH3061 Spring 2009
Main PWB X100 and X1005 CheckMain PWB X100 and X1005 Check
X1005 LocationX100
Location
2.28Vp/p12Mhz
Set on or off
X400
IC100 Microprocessor Crystal
MAIN PWB
4.95Vp/p 25Mhz
X1005
Crystal for Tuner Controller IC1004
Only when set is on
X1001.62V
1.58V
1.48V
1.55V
LCD DV 32LH3062 Spring 2009
Main PWB LD1000 FunctionMain PWB LD1000 Function
Main PWBLD1000 Location
Use LD1000 as a visual aid.This lets you know if the tuner internal PLL
(Phase Locked Loop) system is locked. Illuminated PLL is normal. Off is abnormal tuner lock.
LD1000
LCD DV 32LH3063 Spring 2009
Main PWB Tuner with Shield Off (Pin ID)Main PWB Tuner with Shield Off (Pin ID)
1
19
18
4
13
12
9
8
LCD DV 32LH3064 Spring 2009
MAIN PWB
Main PWB Tuner Video and SIF Output CheckMain PWB Tuner Video and SIF Output Check
Tuner Location
450mVp/p
Pin 19 “Video”Signal
Pin 16 “SIF”Signal
2.24Vp/p
USING COLOR BAR SIGNAL INPUT
Pin 12 and Pin 13“Dig IF” Signal
Note:“Dig IF” Signal only when receiving a Digital Channel.
700mVp/p
Pin 1
Note: “Video Out” Signal only when receiving an analog Channel.
Possibility of two different tuners
LCD DV 32LH3065 Spring 2009
Main PWB Tuner Clock and Data LinesMain PWB Tuner Clock and Data Lines
Pin 8 SDA
100uS1V per/div 5V p/p
Pin 9 SCL
100uS1V per/div 5V p/p
Note:SCL and SDA only active
during an actualChannel Change.
LCD DV 32LH3066 Spring 2009
MAIN PWB
Main PWB LVDS P800 Video Output CheckMain PWB LVDS P800 Video Output Check
P800Location
To confirm that the Main PWB is outputting Picture Content signals, check P800 (LVDS) cable for output. Check pins 11-14,16-17, 19-24, 27-30, 32-33 and 35-40. Pins 35-36 carry the clock for TA and 19-20 carry the clock for TB. These signals vary from each other, 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 standard SMTE Color Bar output from a generator as the input source.
Pin 1
Pin 39
This is just a sample of two pins on the LVDS.There are 8 pins on P801 carrying video.
2uS
500nS
2uS
500nS
Pin 51
Pin 1, 2, 3, 4 (LVDS 12V)
P800
Pin 11
LCD DV 32LH3067 Spring 2009
Main PWB Connector P700 to Power Supply Voltage and Diode CheckMain PWB Connector P700 to Power Supply Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
1.33V3.2V0V2PWM-DIM24Gnd0V0VErr Out22
3.17V4.67V0VINV ON20Open24.8V0V24V18GndGndGndGnd16Open12.3V0V12V14GndGndGndGnd121.5V5.14V5.14V5.2V101.5V5.14V5.14V5.2V8GndGndGndGnd6GndGndGndGnd42.8V4.99V0VPWR-ON2
Diode CheckRun STBYLabelPin
Openncncnc23Open1.65V0V1BR121Openncncnc19Open24.8V0V24V17GndGndGndGnd15
Open12.3V0V12V13GndGndGndGnd111.5V5.14V5.14V5.2V91.5V5.14V5.14V5.2V7GndGndGndGnd5GndGndGndGnd3
Openncncnc1
Diode CheckRun STBYLabelPin
1BR1 (A-DIM) Pin 21 Fixed and not used 2PDIM Pin 24 can vary according to type of signal being processed, OSD Backlight setting. 0.6V 0% to 3.3V 100% and the Intelligent Sensor. Output from the video processor chip.
P700 “Main PWB" to P201 “SMPS PWB"Odd Pins Even Pins
LCD DV 32LH3068 Spring 2009
Main PWB LVDS Connector P800 Pin IdentificationMain PWB LVDS Connector P800 Pin Identification
12V forT-CON PWB
Not used on T-CON
Video Video
Video
10bit TA or 10bit TB
Resolution
Video
51 1
P800
Video
Video
TA Clock
TB Clock
LCD DV 32LH3069 Spring 2009
Main PWB Connector P800 to TMain PWB Connector P800 to T--CON Voltage and Diode CheckCON Voltage and Diode CheckDiode Check taken with meter in Diode Mode with all Connectors Removed
P800 "Main" CONNECTOR to CN1 "T-CON PWB“
*Pin 44 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%) Customer’s Menu Backlight setting. But is Not Used by T-CON.
(See arrow on the T-CON PWB CN1 indicating pin 1)
Pins 6~10, 15, 18, 26, 31, 34, 41, 51 all Ground
45444342
1.95V0V0VLVDS-SELOpen*0V0VPWM-DIM1.75V0V0VOPC-OUT1.75V0V0VOPC-EN
1.1V3.24V0VBIT-SEL25
1.1V1.2V0VTXA4+1.1V1.1V0VTXA4-
4039
1.1V1.2V0VTXA3+1.1V1.1V0VTXA3-1.1V1.1V0VTXA0+1.1V1.2V0VTXA0-
38373635
1.1V1.2V0VTXA2+
1.1V1.1V0VTXA2-
3332
1.1V1.2V0VTXA1+1.1V1.1V0VTXA1-1.1V1.1V0VTXA0+1.1V1.2V0VTXA0-
30
1.1V1.2V0VTXB4-1.1V1.2V0VTXB3+
23
1.1V1.1V0VTXB3-2221
1.1V1.1V0VTXBC+201.1V1.2V0VTXBC-191.1V1.1V0VTXB2+17
0.8V1.1V0VTXB0+1.1V1.2V0VTXB0-
1.1V1.2V0VTXB2-160.8V1.1V0VTXB1+141.1V1.2V0VTXB1-13
1211
n/cn/cn/cN/C5, 46~50
3.18V12.1V0VLVDS 12V43.18V12.1V0VLVDS 12V33.18V12.1V0VLVDS 12V2Gnd12.1V0VLVDS 12V1
292827
LCD DV 32LH3070 Spring 2009
Main PWB Connector P1204 to (Ft. IR/LED Control) Voltage and DMain PWB Connector P1204 to (Ft. IR/LED Control) Voltage and Diode Checkiode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
P1204 CONNECTOR "MAIN PWB" to P1 "Front IR / LED PWB Assy"
Open3.29V0VPOWER On/Off120.76V3.29V3.29V3.3V_ST11GndGndGndGnd10
Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd71.5V5.1V5.1V5V ST61.1V3.3V3.3VKey251.4V3.3V3.3VKey14GndGndGndGnd3
1.67V3.3V3.3VSDA2Open3.3V3.3VSCL1
Diode CheckRun STBYLabelPin
1
LCD DV 32LH3071 Spring 2009
Main PWB Connector P600 to Speakers Voltage and Diode CheckMain PWB Connector P600 to Speakers Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
SPK-L(+)
SPK-L(-)
SPK-R(+)
SPK-R(-)
LABEL
2.6V12.4V0V4
2.6V12.4V0V3
2.6V12.4V0V2
2.6V12.4V0V1
Diode CheckRunSBYPin
P600 CONNECTOR "Main" to "Speakers"
Use speaker out to test for defective Audio Amp IC600
1
LCD DV 32LH3072 Spring 2009
FRONT IR AND KEY BOARD SECTIONFRONT IR AND KEY BOARD SECTION
The Front IR board contains the Infrared receiver and the Power LEDs.
This board receives its B+ (STBY5V) from the Main PWB. It also has connections to the side Key board. The 3.3V pull up for the keys is routed from the Main board through the Front IR board to the Side Key board.
The Front Power LEDs pulsate or appear to move. This is accomplished using multiple LEDs and a driver IC U2 which communicates with the Main board via Clock and Data lines.
There are several Zener diodes on the board as well and since it receives STAND-BY 5V (STBY 5V) it could make the Power Supply or the Main boardappear to be defective if a short was introduced to the stand by line.
LCD DV 32LH3073 Spring 2009
Front PWB Assembly (IR and Power LED) Layout (Front and Back VieFront PWB Assembly (IR and Power LED) Layout (Front and Back View)w)
To Main PWB
IR Sensor
P1P2 To Main PWB
To SideKey PWB
Power LEDs
U2 LED driver
Note: STBY5V is routed to this board. Possibility of a short.
LCD DV 32LH3074 Spring 2009
Front IR/LED Control Connector P1 and P2 to Main Voltage and DiFront IR/LED Control Connector P1 and P2 to Main Voltage and Diode Checkode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed
2.2V
Open
Gnd
2.5V
2.41V
Gnd
2V
Open
Open
Gnd
2.8V
2.8V
Diode Check
3.3V3.3VSCL13.3V3.3VSDA2GndGndGnd33.3V3.3VKey143.3V3.3VKey255.1V5.1V5V ST6GndGndGnd7GndGndGnd84.8V4.8VIR9GndGndGnd10
3.29V3.29V3.3V_ST113.29V0VPOWER On/Off12
RunSTBYLABELPin
P1 Connector “IR/LED Control PWB“to "MAIN PWB" P404
P2 Connector “IR/LED Control PWB“to “Side Key" P3000
Gnd
Key2
Gnd
Key1
Label
Gnd
Open
Gnd
Open
Diode Check
GndGnd4
3.3V3.3V3
GndGnd2
3.3V3.3V1
Run STBYPin
LCD DV 32LH3075 Spring 2009
Side Key AssemblySide Key Assembly
To Main PWBP3000
SW3008
SW3007
SW3006
SW3005
SW3004
SW3003
SW3002
SW3001
LCD DV 32LH3076 Spring 2009
Side Key Assembly P3000 InformationSide Key Assembly P3000 InformationP3000 Resistance Measurements with Key pressed.
CH (Up)CH (Dn)
Volume (+)Volume (-)
KEY
10K Ohms4.8K Ohms1.8K Ohms270.5 Ohms
Pin 3 measured from Gnd
10K Ohms4.8K Ohms1.8K Ohms270.5 Ohms
Pin 1 measured from Gnd
EnterMenuInput
Power
KEY
P3000 Voltage Measurements with Key pressed.
CH (Up)CH (Dn)
Volume (+)Volume (-)
KEY
2.24V1.65V
0.906V0.179V
Pin 3 measured from Gnd
2.24V1.65V
0.906V0.179V
Pin 1 measured from Gnd
EnterMenuInput
Power
KEY
P3000 Connector “Side Key" to “IR/LED Control PWB“ P1
GndKey2GndKey1
Label
GndOpenGndOpen
Diode Check
GndGnd43.3V3.3V3GndGnd23.3V3.3V1
Run STBYPin
1
4
LCD DV 32LH3077 Spring 2009
Main Power Switch NoteMain Power Switch Note
Pay attention to the Main Power Switch. Don’t forget to
leave it in the On Position.
ON OFF
LCD DV 32LH3078 Spring 2009
11 X 17 Foldout Section11 X 17 Foldout Section
This section shows the 11X17 foldout thatThis section shows the 11X17 foldout that’’s available in the Paper s available in the Paper and Adobe version of the Training Manual.and Adobe version of the Training Manual.
IC7051.26V_VDDC
1 (0.78V)2 (Gnd)3 (5V)4 (5.9V)5 (5V)6 (1.3V)7 (1.3V)8 (3.16V)
32LH30 INTERCONNECT DIAGRAM
Power Supply
P201
F501
F100
SK100L
N
6.3A / 250VA/C Fuse
335V Actual Reading3.15A / 250V Rating
P101
TO TFT MODULE
SMPS TEST 1: To Force Power Supply On.Disconnect P800 on Main PWB.Jump pin 7,8,9 or 10 (5V) to pin 2 using a 10K resistor. (Test Voltage Outputs 12V, and 24V).
SMPS TEST 2: Jump pin 2 to pin 20 (INV-ON).(Ballast and all voltages should turn on).
20 bit LVDS
Warning:T-Con PWB under shield. Be sure to reinsert screws before operating set with
shield removed.
12V to T-CON Pin 48 ~ 51
P800 “Main” TO CN1 “T-CON”
11Gnd6
K13A60DQ602K6A60DQ101, Q102FSU10B60
D201, D251, D252, D255
Gen PT #
MBRF10100CT
D602
LOC
TO TFT MODULE
LED1
T2T1
D255
D201D252
D251
Q102
Q101
Q602
D602
A/C
Rec
tifie
r 4A
+
-
~~
CN1
P203
SK101
789
10
1.95V0V0VLVDS-SELOpen*0V0VPWM-DIM1.75V0V0VOPC-OUT1.75V0V0VOPC-EN1.1V1.2V0VTXA4+1.1V1.1V0VTXA4-
1213
1.1V1.2V0VTXA3+1.1V1.1V0VTXA3-1.1V1.1V0VTXAC+1.1V1.2V0VTXAC-
14151617
1.1V1.2V0VTXA2+
1.1V1.1V0VTXA2-
1920
1.1V1.2V0VTXA1+1.1V1.1V0VTXA1-1.1V1.1V0VTXA0+1.1V1.2V0VTXA0-
32232425
1.1V3.24V0VBIT-SEL271.1V1.2V0VTXB4-1.1V1.2V0VTXB3+
29
1.1V1.1V0VTXB3-3031
1.1V1.1V0VTXBC+321.1V1.2V0VTXBC-331.1V1.1V0VTXB2+35
0.8V1.1V0VTXB0+1.1V1.2V0VTXB0-
1.1V1.2V0VTXB2-360.8V1.1V0VTXB1+381.1V1.2V0VTXB1-39
4041
3.18V12.1V0VLVDS 12V483.18V12.1V0VLVDS 12V493.18V12.1V0VLVDS 12V503.18V12.1V0VLVDS 12V51
MAIN (Digital) Board
To Speakers
Reset IC100
IC10048vsb/QAM
Q7061 (5V)2 (0.48V)3 (0.48V)4 (6V)5-6 (12.3V)7-8 (5V)
IC600Audio56 Pin
To SMPS
PW
B
L726
L710
Q706 Switch(12V LVDS)(5V General)
X100525 Mhz
X10012 Mhz
IC1003
IC601
IC701
P600
P700
P1204
LD1000
To Front Control
IC105
IC7043.3V-FE1 (0.78V)2 (Gnd)3 (5V)4 (7.4V)5 (2.12V)6 (3.28V)7 (3.28)8 (5V) IC701
1.8V_DDR1 (N/C)2 (3.18V)3 (3.18V)4-5 (N/C)6 (1.87V)7 (0.8V)8 (Gnd)
Q702Inv-On Control
Gnd0V(0.6V)
3.85V (0V)
IC1000
1.2V_PVSB1 (N/C)2 (3.2)3 (3.2V)4-5 (N/C)6 (1.2V)7 (0.8V)8 (Gnd)
IC105HDCP EEPROM1-2 (Gnd)3 (5V)5-6 (0V)4-7 (Gnd)6 (1.2V)7 (0.8V)8 (5V)
IC101
Flash Memory1-2 (0V)3-4 (0V)5-6 (0V)7-8 (3.2V)
IC10035V-Tuner
source1 (12V)2 (Gnd)3 (8.94V)
IC1002
5V-Tuner1 (8.94V)2 (2.37V)3 (5V)4 (N/C)5 (Gnd)
IC702 (3.3V_ST)
1 (5V)2 (3.3V)3 (0V)
IC6011.8V Amp1 (3.2V)2 (1.8V)3 (0V)
IC107Power Det
1 (Gnd)2 (Reset) .3V3 (3.28V)
IC107
IC7043.3V_FE
IC7051.26V_VDDC
Grayed Out ICs are located on Back*
IC100Video
ProcessorMstar
P800
( ) = Off
IC702
Also, Main Micro
Q701PWR On5V (5V)
5V (0V)
0V (0.6V)
To T-CON (LVDS)
IC500 / IC501HDMI EDID
IC500 IC501
IC1200R,G,B PC/
DDC
1
TUNER
16 SIF
19 Video
4 (5V)
12 DIF +13 DIF -
15 (5V)
24V LED
Tuner Data
CN1 CONNECTOR "T-CON” PWB CON PWB
Pin Diode TestRun VSTBYPin ID Pin Diode TestRun VSTBYPin ID
Ballast
48Khz input
1.2KV1.2KV
Side (Key) C
ontrols
GndKey2GndKey1
Label
GndOpenGndOpen
Diode Check
GndGnd43.3V3.3V3GndGnd23.3V3.3V1
Run STBYPinJ3
J1
Front PWB Assembly(Interface)
IR ReceiverPower Button
P203 "SMPS" to CN1 "Ballast"
Open0V0VError14Open3.40V0VVBR_B13Open3.45V0VOn/Off12Open1.67V0VBVR_A11
GndGndGndGnd10GndGndGndGnd9GndGndGndGnd8GndGndGndGnd7
GndGndGndGnd60.729V24.52V0VVBL50.729V24.52V0VVBL40.729V24.52V0VVBL3
0.729V24.52V0VVBL20.729V24.52V0VVBL1
Diode CheckRun STBYLabelPin
Open0V0VError14Open3.40V0VVBR_B13Open3.45V0VOn/Off12Open1.67V0VVBR_A11
GndGndGndGnd10GndGndGndGnd9GndGndGndGnd8GndGndGndGnd7
GndGndGndGnd60.729V24.52V0VVBL50.729V24.52V0VVBL40.729V24.52V0VVBL3
0.729V24.52V0VVBL20.729V24.52V0VVBL1
Diode CheckRun STBYLabelPin
MainPowerSwitch
P101 o J3 Front PWB
Note: CN1 Pin 1 is P800 Pin 51
To BacklightLeft Side
To BacklightRight Side
16 16
On then Off after ballast
fires
22V p/p 34V p/p
Pin 1 Pin 6
Do not run Ballast without
heat sink attached
Pins 1, 11, 18, 21, 26, 34, 37, 42~46 are all GroundPins 1~6 and 47 Are not used
Pin 21 BR1 (ADIM Analog Dimming) Fixed and not used
Pin 24 PDIM (Digital Dimming) can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the Video Processing chip IC100.
P201 Even“SMPS” to P700 “Main”
Open4.99V0VPWR-ON2
Open0V0VErr Out22
Open3.2V0VPDIM24
CheckRun STBYLabelPin
ncncncnc1
GndGndGndGnd3,4,5,6
ncncncnc23
Open5.14V5.14V5V7,8,9,10GndGndGndGnd
Open12.3V0V12VGndGndGndGnd
0.73V24.8V0V24V
GndGndGndGnd11,12Open12.3V0V12V13,14GndGndGndGnd15,16
0.73V24.8V0V24V17,18ncncncnc19
Open4.67V0VINV.ON20Open1.66V0VBR121
P1204 CONNECTOR "MAIN PWB" to J1 "Front IR / LED PWB
Open3.29V0V120.76V3.29V3.3V_ST11GndGndGndGnd10Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd71.5V5.1V5.1V5V ST61.1V3.3V3.3VKey251.4V3.3V3.3VKey14GndGndGndGnd3
1.67V3.3V3.3VSDA2Open3.3V3.3VSCL1
Diode CheckRun STBYLabelPin
Open3.29V0VPOWER On/Off0.76V3.29V3.29VGndGndGndOpen4.8V4.8VGndGndGndGndGndGnd1.5V5.1V5.1V1.1V3.3V3.3V1.4V3.3V3.3VGndGndGnd
1.67V3.3V3.3VOpen3.3V3.3V
Diode CheckRun STBYLabel
E
C
BKEY
(-5V)Pin 56
(24.3V)Pin 55
(16V)Pins 5,6
(3.3V)Pins 2,3
(-5V)Pin 5
(24.3V)Pin 6
(16V)Pins 55,56
(3.3V)Pins 58,59
US363V/1.5A
CN4
US21 (0V)2 (1.8V)3 (3.3V)
UC1
D8
D9
L1
L2
3.3V
F1 (12V)
CN1 16.9V
FL1
FL2FL3FL4
1.5V Fuse
s
3.3V Fuses
T-CON
CN3
16.9V 3.3VC110C115 3.3V
16.9V
24.3V
D10A
C
A
-7.26V
VDD
12V LVDS
FL7GndFL8
Gnd
Pins48-51
C84
3.3V
12V LVDS
R92
Pin 23,24
Pin 25,26
24V Pin 812V
LVDS12V Pin 37,38
32LH3032LH30Direct View LCD
This concludes the 32LH30training presentation.