Lg 42lh40 Training Manual

42LH40 Direct View LCD42LH40 Direct View LCD

1080PDirect View LCD

Published July 2009

Updated February 17, 2010

July 2009 LCD DV 42LH402

OUTLINEOUTLINE

• Main Board

Circuit Board Operation, Troubleshooting of :• Switch mode Power Supply/Ballast Combination

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


42LH40 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


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)


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)


New Training Materials on New Training Materials on the Learning Academy sitethe Learning Academy site

Customer 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

Published July 2009 by LG Technical Support and TrainingLG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

http://136.166.4.200LG Learning Academy

32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG90, 47LH8542PG20, 42PQ20, 50PQ30, 50PG20, 50PS80, 50PS60

LCD-DV:PLASMA:

Also available on Also available on the Plasma pagethe Plasma page

Plasma PanelAlignment Handbook

LG CONTACT INFORMATIONLG CONTACT INFORMATION


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

SECTION 1: LCD DIRECT VIEW OVERVIEWSECTION 1: LCD DIRECT VIEW OVERVIEW


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.


This section of the manual will discuss the specifications of the 42LH40LCD Direct View Display Panel.

42LH40 Product Information42LH40 Product Information


Basic SpecificationsBasic Specifications

Key Features• Full HD 1080p HD Resolution• 70,000:1 Dynamic Contrast Ratio • TruMotion 120Hz• Intelligent Sensor Mode• 2.7ms Response Time (GTG)• 500 cd/m2 Brightness• Wide Color Gamut• Super IPS Panel• Wide Viewing Angle• XD Engine®• 24p Real Cinema• ISFccc® Ready• Picture Wizard• AV Mode II (Cinema, Sports, Game)• 60,000 Hour Panel Life (typical)• NTSC/ATSC Tuners with Clear QAM

Basic Specifications (LOGO Familiarization)Basic Specifications (LOGO Familiarization)

Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture.



FULL HD 1080p HD Resolution Pixels: 1920 (H) × 1080 (V)High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.

Pixel Count to Resolution ComparisonsPixel Count to Resolution Comparisons

FORMATS480I480P1080I720P1080P

InterlacedProgressiveInterlacedProgressiveProgressive

Interlaced2 Fields to make a Frame

ProgressiveEach Field is a Frame

Think of sync as the Panels “Refresh Rate”

240 Lines480 Lines540 Lines720 Lines1080 Lines

NTSCSDHDHDHD

Possible FrameRates:24FPS30FPS60FPS

1080P

BASICPIXEL COUNTS

720P Panel1365 (H) × 768 (V)

1080P Panel1920 (H) x 1080 (V)


TOP PORTION

BOTTOM PORTIONRemote Control FamiliarizationRemote Control Familiarization


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


Rear and Side Input JacksRear and Side Input Jacks

Rear In/Out Jacks

USB PortSoftware Upgrades

Music, Photos

Side In/Out

MAIN PWBRear and Side

Input/Output locations

Rear

Side


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 DOWNLOADUSB 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.

7-7/8"200mm

25-13/16"655.3mm

40-13/16"1036.3mm

Remove 4 screws to remove stand for

wall mount

Model No.Serial No.

Label

16-1/8"410mm

22-13/16"580mm

28-3/8"721.4mm

Center

3-7/8"97.8mm

2-9/16"65.7mm

Weight without Stand: 36.4 lbWeight with Stand: 40.3 lb

WattageAverage: 143WStand By: less than 1W 3-1/2"

88.9mm

11-9/16"294mm

20-7/16"518mm

12-15/16"327.8mm

There must be at least 4 inches of Clearance on all sides

42LH40 Product Dimensions42LH40 Product Dimensions

12-15/16"327.8mm 8-7/8"

225.3mm

7-7/8"200mm

9-1/16"230mm

17


Disassembly:This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42LH40 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


Remove the 21 screws indicated.Pay attention to the size and type of screw

as there are many different types.Putting in an improper screw when reassembling may Cause damage.

The Stand does not need to be removed before removing the back.

Removing the Back Cover Removing the Back Cover


Circuit Board LayoutCircuit Board Layout

POWER SUPPLYLVDS Cable

Ft IR/LED Control

AC Input

RFInput

Speaker R

Rear Inputs

MasterPower Switch

Side Keys

Speaker L

BacklightConnections

No T-CON or Ballast board

LVDS Cable

Main PWB


POWER SUPPLY SECTIONPOWER SUPPLY SECTION

This switch mode power supply has the ballast section built in.The power supply develops Stand By 5V, 12V and 24V for the Main board.

This power supply draws a little less that 1 watt during stand by mode. The fuse F501 reads 157V (from hot ground) during this time. When the controller chip (on the back) receives the PWR-ON command via P201 Pin 19, the primary section increases its current supplying ability. The Primary fuse F501 now reads 380V. 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2. Internally, the power supply also sends B+ (390V) voltage to the Ballast section but it is not turned on at this time.When the power supply receives the INV-ON command via P201 pin 20, it is routed to the driver for the ballast (on the back of the board). The driver now starts to deliver drive information to the output FETs (on the far left hand heat sink) which in turn switch the primary sides of the two ballast transformers T703 and T704. They output 1.2Kv (48Khz) pulses to the backlights via P401 and P402.


Power Power Supply PWB Supply PWB RemovalRemoval

Disconnect P201, P401, P402, AC In SK101 and SK102.

P201

AC InP401

P402

Press inTwo tabsto release

lock

P201

SK102

SK101

Remove the 6 screws indicated by the arrows w/screw.

There are three types of Main Power switch used in LG televisions. This set utilizes Type 1.

Type 1: Shuts off AC to the Power Supply.

Type 2:Opens ground to the front IR board. (Stand-By 5V Remains, the Main board stays alive).

This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high when ground opens. When the switch is closed, this same line called Power Key feeds back to the Microprocessor and the Micro. Turns on the Power.

Type 3: Opens ground to the front IR board. (Stand-By 5V turns off, the Main board is dead).

This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high when ground opens. This line feeds back to the Main board and from there it routes to the Power Supply. The high tells the Controller chip to turn off STBY-5V. When the switch is closed, this same line called Power Key now goes high and feeds back to the Power Supply and tells the controller chip to turn STBY-5V on.

Power Supply (Main Power Switch Type 1) LocationPower Supply (Main Power Switch Type 1) Location

OffOn

If the TV won’t come on, be sure to check the Main Power Switch before assuming a failure has occurred.

This switch breaks AC to the SMPS.

MAIN POWER SWITCH LOCATIONTYPE 1

(Bottom Right Side viewed from front)



POWER SUPPLY SECTIONPOWER SUPPLY SECTION

This switch mode power supply has the ballast section built in.The power supply develops Stand By 5V, 12V and 24V for the Main board.

This power supply draws a little less that 1 watt during stand by mode. The fuse F501 reads 157V (from hot ground) during this time. When the controller chip (on the back) receives the PWR-ON command via P201 Pin 19, the primary section increases its current supplying ability. The Primary fuse F501 now reads 380V. 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2. Internally, the power supply also sends B+ (390V) voltage to the Ballast section but it is not turned on at this time.When the power supply receives the INV-ON command via P201 pin 20, it is routed to the driver for the ballast (on the back of the board). The driver now starts to deliver drive information to the output FETs (on the far left hand heat sink) which in turn switch the primary sides of the two ballast transformers T703 and T704. They output 1.2Kv (48Khz) pulses to the backlights via P401 and P402.

AC In

Stand By 5V

Remote or KeyPower On

Resets Microprocessor

Main Board

MAIN PWB

5V Reg

PWR

12V VideoProcessing

InvOn

Microprocessor section of Mstar

IC100

12V/24V Regulators

Other Regs

StandBy 5V Reg1

2 5 66 8

2

5

42LH40 Power Supply Start Up Sequence42LH40 Power Supply Start Up Sequence

5

5

In Stand-By Primary side

is 178VIn Run

it is 380V

3

24V Audio

12V 24V

Power Det. Circuit

8

3.3V Regfor Micon

LVDS12V

12V

7

7

At point TV is in Stand-By state. Energy Star compliant.Less than 1 Watt

3

LVDS Panel Control

Inv On/Off

Other Circuits

A-DIMFixed

P-DIM

Other C

ircuits

9

9

Cust Menu for BacklightPicture Content

Intelligent Sensor feedback

BALLAST SECTION

Relay O

n (PWR

)

Power Supply will not be on if Main

Power Switch is off.

Ft Control

Master (Main)Power Sw

OnOff

POWER SUPPLY (SMPS)

+5VGeneral

L

L

8Inverter On

380VRegulator

6

Manipulates Backlights

Inverter OnStarts the Ballast

Drive Signal

Drive Sig

P-DIM

Backlights Light

10

4

Video

Blue LED lights to assist Backlight Lamp Firing

DC Up, Backlight brightness Up

7

11

12V LVDS

To Panel

25

TFT Driver Section Main PWB

BallastDriver FETs

1.2Kv

1.2Kv

64K

IC1100 TFT ControlerSectionTru-Motion

Video Processing section of

Mstar IC100Video

PWM-DIM (PWM Dimming) Manipulates the Backlight Brightness via Customer’s OSD.Manipulates the Backlight Brightness via the Video Processor Chip. Darker Picture, Darker Backlights to facilitate improved Contrast Ratio. 0.6V ~ 3.3V Range

42LH40 P700 on Main Board to SMPS P201 Turn On Circuit Diagram42LH40 P700 on Main Board to SMPS P201 Turn On Circuit Diagram

R189

R1851.2K

100

R714

R704

C711150pF

C1811uF

P700

12V12V

Gnd

Gnd

Gnd

Gnd

0V

3.38V

4.98V

1.8V

P201

ERR Out

PWR

A.DIMINV.On

PWM-DIM

n/c

SMPS

AB12

IC100Mstar

PWM2

PWM0

100Ω

n/c

GndGndGndGnd

Analog Dimming (Fixed Value)

100

H5

R245100

GPIO137SBY5V

MAIN PWB

5V

5V5V5V

GndGnd

12V

21

43

65

87

109

1112

1413

1615

1817

2019

2221

2324

21

43

65

87

109

1112

1413

1615

1817

2019

2221

2324

21.3V24V

GndGnd

GndGndGndGnd

n/c n/c

n/c n/c

E5 GPIO 134

L706

L70424V

C72168uF

C72768uF

L70712V

C72247uF

L701

R702

R257

G5R719 1KΩ

Q702

R713 0Ω

R717 3.3KΩ

GPIO 136R244 100Ω

+5V General

Power On

Inverter On/Off

3

1

2

6

5

8

7

Q706

+5VL715

+5V GeneralL709

LVDS 12V Panel PowerL728

Q703 R726 10KΩ

0.2V

6V

0.6V

4Q704Q705

LVDS Panel Control

R73222KΩ

0V0.6V

12VR739 47KΩ

R740 47KΩ

AB13

Digital Dimming (Variable)

C726220uF STBY5V

L700

R760

0L705

Relay On

A-DIM

P-DIM

STBY5V

4.7KC1821uF

C7251uF

C7061uF

21.3V

3.8V

10K

26

R708C745100uF

Q700Q701

L708

5.2V

n/c

n/c

INV ON/OFF

PWR ON

A-DIM

PWM-DIM

R201 100Ω

E8 GPIO 97Error Out Stby = 5V Run = 0V

Error 5V: Normal 0V:Lamps try to fire 4 time, if Error line is high, Micro

shuts off television.


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 andmust be replaced. There is no need to continue with the next test.

(b) Unplug P700 on the Main PWB.

TEST 1:

(1) Add a 100Ω 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) • P201 (12V pins 13 and 14)

(2) Remove AC power.Use P700

Side to insertresistors


Continue if the 1st test was OK. Leave original resistor in place.

(3) Add another 100Ω resistor between (5V) pin 7, 8, 9 or 10 and Pin 20 (INV On).

(4) Apply AC Power. Simulating a Power and Backlight On command.

Backlights Normal:a) If normal, the backlights should turn on. SMPS OK.

Backlights Abnormal:a) Recheck all connections.b) Confirm the INV On/Off line pulling up to at least 3V.

REMOVE AC POWER:c) Check the connections to the Backlights.

DO NOT check these when AC is applied as they carry 1.2Kv each.Note, either of the connections are unplugged, the backlights will not light.

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


General Backlight InformationGeneral Backlight Information

To Backlights Over 1.2KV

Currently, number of lamps “Unknown”

To Backlights Over 1.2KV

Ballast Section of SMPS

EEFL (External Electrode Fluorescent Lamp)LOW COST Large number of lamps driven by a single inverter


Simple structure, Low price

Complicated structureSimple structure

Lamp manufacturing processLamp assembly structure

Low CostLarge number of Lamp Drive by single inverter

Introducing EEFL


Introducing EEFL Contacts (Bulb Design)

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

Ballast Section of SMPS LayoutBallast Section of SMPS Layout

To BacklightsLeft Side T703

T704

Viewed from rear

To BacklightsRight Side

SMPS PWB

BacklightsTest PointBottom of

R406 or R40338V P/P

1.2Kv

48Khz


42LH40 Ballast Control Signals Circuit Diagram42LH40 Ballast Control Signals Circuit Diagram

33

IC100Mstar

R743 100Ω

R7191KΩ

R704 4.7KΩ

A-DIM

PWM-DIM

INV On/Off3.8V

VBR-B (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

INV-On/Off

PWB-0AB12

AB13 PWM-2

20

24

21

R189 100Ω

R185 1.2KΩ

R244100Ω

G5

VBR-A (Analog Dimming)This line is not used.

P700POWER SUPPLY

RL-ON

PWR

4.89V2

12VReg

24VReg

13

14

17

18

390V

BALLAST SECTION

1.67V

IC301

380VReg

160VReg

ERR0V

22

P201MAIN PWB

20

24

21

2

13

14

17

18

22

IC600Ballast Control IC

12V

24V

On Back of PWB

On Back of PWB

INV O

n/Off

To Backlights1.2Kv

Two

Transformers

Drive C

ircuitFE

Ts Q709/10

Drive Control

Q702

R704 4.7KΩ

R7590Ω

R714100Ω

GPIO 134

GPIO 136

R237100Ω

Q701

Q700

R703R706

E5

7 8

9 10

7 8

9 10STBY5V

STBY5V

L700

L733

BallastPower

Hot GndP401

P402

Stand By 5VReg

Controller

R717 3.3KΩ

+5V General

GPIO 97

ERROR-Out

R201100Ω

E8

0V~130V

0V~130V

Varies with PDIM

390V


Power Supply Backlight Drive Signal EffectsPower Supply Backlight Drive Signal Effects

PWMDIMmanipulates

the Burst Triangle

Oscillator in the ballast drive IC.

ADIM also manipulates

the Burst Triangle

OscillatorBut it is not

used.

Note:Backlights will attempt to fire 4

time. During these attempts, the Error

line will change from 5V to 0V.

0V when lamp tries to fire or is lit.

5V when the lamps are not lit.

After 4 attempts, if the Error Out line returns to 5V, this tells the Micro to turn the set off.


Power Supply Connector P201 Voltage and ResistancePower Supply Connector P201 Voltage and Resistance

Diode Mode values taken with all Connectors Removed

1.19V4.98V0VPWR-ON2

GndGndGndGnd4

GndGndGndGnd6

2.85V5.14V5.14V5V8

2.85V5.14V5.14V5V10

GndGndGndGnd12

1.2V12.3V0V12V14

GndGndGndGnd16

0.81V21.4V0V24V18

2.25V3.8V0VINV.ON20

Open0V0VErr Out22

Open3.2V0V2PDIM24

Diode CheckRun STBYLabelPin

P201 Even "SMPS" to P700 "Main PWB"

ncncncnc1

GndGndGndGnd3

GndGndGndGnd5

2.85V5.14V5.14V5V7

2.85V5.14V5.14V5V9

GndGndGndGnd11

1.2V12.3V0V12V13

GndGndGndGnd15

0.81V21.4V0V24V17

ncncncnc19

Open1.66V0V1A.DIM21

ncncncnc23


P201 Odd "SMPS" to P700 "Main PWB"

1ADIM 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 IC100.


Power Supply Connector SK100 and SK101 Voltage and ResistancePower Supply Connector SK100 and SK101 Voltage and Resistance


AC Voltage Readings Across Pins 1 and 2 for STBY and RUN.

OLN2

OL120Vac

L1


AC Voltage Readings for either pin 1 or pin 2 in STBY and RUN with one lead on Neutral of SK100.

OLn/a2

OL120Vac

n/a1


SK100 "SMPS" to AC IN SK101 "SMPS" to MASTER POWER SWITCH

SK101 SK100

Bottom Right of SMPS

Live

Neutral

With the Master Power SwitchClosed (On) AC flows.When Open (Off) AC open and does not flow.

F100

F1006.3A/250V

AC IN


MAIN PWB SECTIONMAIN PWB SECTION

The Main PWB also contains the T-CON (TFT Driver) section. This set does not use a normal T-CON board.There are two LVDS cable feeds that go directly to the Panel. These carry the TruMotion 120Hz duel 12 bit LVDS, (video signal) that has already been prepared for the panel drivers.

The Main board receives its operational B+ from the Power Supply via P700.

STAND-BY• STBY 5V pins 7~10

The Main board also develops several B+ sources on the board. LVDS

• VCC-LCM+3.3V, • VDD-LCM+16V, • VGH+24V• VGHM+24V• VGL-5V

AUDIO• 3.3V• 1.8V

Mstar IC100 (Video) / MICROPROCESSOR• 1.2V, 1.26V, 1.8V, and 3.3V

RUN • 12V pins 13 and 14 • 24V pins 17 and 18.

TUNER and VSB CIRCUIT • 9V which is used to make 5V TU• 5V• 3.3V• 1.2V


Removing the Main PWBRemoving the Main PWB Remove any tape holding down any cables.Remove the 6 screws indicated by the arrows.

P600

P1200

P700

Flip the locking tab upward, pull the LVDS ribbon out.

NOTE: Be sure to check on top and behind the Video Processor ICs. Look for a piece of

Chocolate(Heat Transfer Material).

Be sure to transfer to new PWB if present.

Disconnect P700, P1204, P600, P1400 and P1401.

P1400 P1401Press in on the top and bottom release

tabs to remove P700.


Main PWB Main PWB LayoutLayout

MICRO and VIDEO PROCESSOR IC100 and Tru-Motion IC1100 run

Hot. This is normal.

1

19

P700To SMPS

P1400

P1200

X100

USB

TunerTU1001

P1400, P1401 to Panel

To Speakers SW100Reset

X1005

P600

LD1000 Tuner OK

when Green

LD1000

IC100

IC100Microprocessor

andVideo Processor

X1100

P1401

IC1100

To Ft Control PWB

To SMPS


Main PWB (Front Side) Component LocationsMain PWB (Front Side) Component Locations

42LH40 Front Side Component Voltages

42LH40 MAIN (FRONT SIDE) SIMICONDUCTORS

IC701 1.8V DDR IC705 3.3V / 1.26V IC101 Flash Boot IC103 Reset IC707 5V EXT IC1001 3.3V FEPin Pin Pin Memory Pin Pin 1.8V MEMC Pin[1] n/c [1] 0.8V [1] 0V [1] Gnd [1] 0.8V [1] 4.9V[2] 3.2V [2] Gnd [2] 3.2V [2] 0V [2] Gnd [2] 4.9V[3] 3.2V [3] 5V [3] 2.5V [3] 3.3V [3] 4.9V [3] Gnd[4] n/c [4] 6.12V [4] Gnd [4] 6.5V [4] 3.36V[5] n/c [5] 4.99V [5] 0V Q105 Power On [5] 4.84V [5] 1.19V[6] 1.8V [6] 1.3V [6] 0V Pin Delay [6] 1.8V[7] 0.79V [7] 1.3V [7] 3.2V E Gnd [7] 1.8V IC1000 Flash Boot[8] Gnd [8] 3.19V [8] 3.2V B 0V [8] 4.83V Pin Memory

C 1.96V [1] 0VIC704 3.3V Reg Q706 5V General IC708 3.3V Reg IC601 1.8V Amp [2] 3.36V

Pin Pin LVDS 12V Pin Q106 Reset Pin [3] 3.36V[1] 0.79V [1] 5.1V [1] Gnd Pin [1] Gnd [4] n/c[2] Gnd [2] Gnd [2] 0.79V E Gnd [2] 1.8V [5] n/c[3] 5V [3] 12V [3] 1.26V B 0V [3] 3.3V [6] 1.19V[4] 7.7V [4] 0.67V [4] 1.26V C 3.3V [7] 0.79V[5] 4.9V [5] 12V [5] 1.8V [8] Gnd[6] 3.3V [6] 12V [6] 5V[7] 3.3V [7] 5V [7] 0V IC1002 5V for Tuner[8] 2.1V [8] 5V [8] 5V Pin

[1] 8.9VD1400 LVDS 16V D1401 LVDS (-5V) D1402 LVDS 3.3V D1204 LED Moving [2] 1.93V

Pin Source Pin Source Pin Source Pin Ft LED [3] 5VA 14.7V A (-5V) A Gnd A 0V [4] n/cJ 20V J (-2.38V) K 3.3V K 0.14V [5] GndK 27V K Gnd A 0V

41


Main PWB Main PWB (Back View)(Back View)

42LH40 Front Side Component Voltages

42LH40 MAIN (BACK SIDE) SIMICONDUCTORS

Q1000 Tuner SIF IC1200 HDMI Q1202 Moving LED Q703 Turns on 5V IC104 EEPROM D1403 LVDS 16VPin Pin Pin Driver Pin General Q706 Pin Pin Source

E 2.4V [1] Gnd E 0.1V E 0V [1] Gnd A 12.2VC 0V [2] Gnd C 0V C 0V [2] Gnd K 16.6VB 3.0V [3] Gnd B 3.3V B 0.62V [3] Gnd

[4] Gnd [4] GndQ1001 Tuner Video [5] 4.8V IC1003 9V Reg Q704 Turns on [5] 3.25V

Pin analog [6] 4.8V Pin for Tuner Pin Q705 [6] 3.25V IC1203 SPDIF OpticE 2.5V [7] 4.8V [1] 12.3V E 0V [7] 0V PinC 0V [8] 4.8V [2] 8.9V C 0V [8] 3.25V [1] 3.25VB 3.2V [3] Gnd B 0.62V [2] 3.24V

IC1101 Flash IC1100 LD1100 Driver [3] GndIC1201 RS232 Pin Q600 Audio Mute Pin [4] 1.6V

Pin [1] 0V Pin Q705 Turns on LVDS G 0.29V [5] 3.25V[1] 3.3V [2] 1V E 0.1V Pin 12V Q706 D 2.9V[2] 5.6V [3] 3.26V C 3.2V E 0V S 0V D1100 LD1100 (Q1100)[3] 0V [4] Gnd B 0V C 0V Pin Gate[4] 0V [5] 0V B 0.66V A 0V[5] 5.5V [6] 0.1V Q701 PWR-On to IC107 Power Det K 0.33VV[6] 5.5V [7] 3.26V Pin P700 pin 2 IC105 HDCP EEPROM Pin Reset[7] 5.5V [8] 3.26V E 5.12V Pin [1] 0.0V[8] 0V C 4.99V [1] Gnd [2] 3.3V[9] 3.3V IC702 STBY 3.3V B 3.07V [2] Gnd [3] 3.2V D1223 B+ Routing

[10] 3.26V Pin Turned on by Q700 [3] 5.05V Pin RGB[11] 0V [1] Gnd [4] Gnd D102 Audio Mute A 5.1V[12] 3.3V [2] 3.3V Q702 INV-On to [5] 5.05V Pin Routing K 4.8V[13] 0V [3] 5.1V Pin P700 pin 20 [6] 5.05V A 0V A 0V[14] 5.6V E 0V [7] 3.25V K 0.1V[15] Gnd C 3.8V [8] 3.25V A 0V[16] 3.3V B 0V

41


Main PWB X100, X1100 and X1005 Crystal CheckMain PWB X100, X1100 and X1005 Crystal Check

3.2Vp/p 12Mhz

Set on or off. Use bottom leg.

IC100 Microprocessor Crystal

MAIN PWB

Tuner Control IC1005 Crystal

4.95Vp/p 25Mhz

X100

X1100 Set on. Use bottom leg.2.4Vp/p 12Mhz

Set on. Use top leg.

TruMotion IC1100 Crystal

X1005


Main PWB LD1000 FunctionMain PWB LD1000 Function

Main PWBLD1000 Location

LD1000

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.


Main PWB Tuner with Shield Off (Pin ID)Main PWB Tuner with Shield Off (Pin ID)

1

19

18

4

13

12

9

8


Main PWB Tuner Video and SIF Output CheckMain PWB Tuner Video and SIF Output Check

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

Note: “Video Out” Signal only when receiving an analog Channel.

MAIN PWBTuner Location


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 actual Channel Change.


Main Board LVDS Power Supply Voltage Generation CircuitMain Board LVDS Power Supply Voltage Generation Circuit

VCC3.3V

VGL-5V

VGHM26V

VDD16V


Main PWB Connector P700 to Power Supply Voltage and ResistanceMain PWB Connector P700 to Power Supply Voltage and Resistance


Open3.2V0V2PDIM24Open0V0VErr Out221.9V3.8V0VInv.Out20Open21.4V0V24V18GndGndGndGnd162.1V12.3V0V12V14GndGndGndGnd121.1V5.14V5.14V5V101.1V5.14V5.14V5V8GndGndGndGnd6GndGndGndGnd4

1.87V4.98V0VPWR-ON2


ncncncnc232V1.7V0V1A.DIM21ncncncnc19

Open21.4V0V24V17GndGndGndGnd152.1V12.3V0V12V13GndGndGndGnd111.1V5.14V5.14V5V91.1V5.14V5.14V5V7GndGndGndGnd5GndGndGndGnd3ncncncnc1


1ADIM 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 IC100.

P700 “Main PWB" to P201 “SMPS PWB"Odd Pins Even Pins


Main PWB Connector P1400 to the Panel Voltage and ResistanceMain PWB Connector P1400 to the Panel Voltage and ResistanceDiode Mode values taken with all Connectors RemovedP1400 CONNECTOR "Main" to “The Panel"

1.3V0VGSP_R20

Open0VH_CONV19

1.3V1.63VGSC18

1.3V0.6VGSP_R17

1.3V0.6VGOE16

GndGndGnd15

2.0V8.4VGMA914

2.0V10.3VGMA713

1.37V11.2VGMA612

2.0V12.3VGMA511

2.0V13.3VGMA410

1.36V14VGMA39

1.4V16VGMA28

2.0V14VGMA17

1.4V7VVCOM_L6

Open7VVCOM_FB5

Open26VVGH M4

GndGndGnd3

0.925V(-5V)VGL2

GndGndGnd1

Diode TestRunLabelPin

1.29V1.28VLMLV0N40

1.29V1.2VLMLV1P39

1.29V1.3VLMLV1N38

1.29V1.2VLMLV2P37

1.29V1.3VLMLV2N36

0.89V1.23VLMLV3P35

1.29V1.23VLMLV3N34

1.29V1.25VLMCLKP33

1.29V1.26VLMCLKN32

1.29V1.2VLMLV5P31

0.9V1.2VLMLV5N30

1.3V1.21VLMLV6P29

1.29V1.22VLMLV6N28

1.24V1.25VLMLV7P27

1.29V1.2VLMLV7N26

1.29V1.23VLMLV8P25

1.29V1.2VLMLV8N24

GndGndGnd23

1.45V0.2VSOE_L22

1.3V1.63VPOL21


GndGndGnd60

Open8.2VLTD_L59

2.0V16VVDD58

2.0V16VVDD57

2.0V16VVDD56

GndGndGnd55

1.6V3.3VVCC54

1.6V3.3VVCC53

GndGndGnd52

2.0V2.3VGMA1851

1.39V0.3VGMA1750

2.0V2.3VGMA1649

2.0V3VGMA1548

1.4V4VGMA1447

2.0V5.2VGMA1346

2.0V6VGMA1245

1.4V7.9VGMA1044

1.3V3.24VOPT_N43

GndGndGnd42

0.89V1.2VLMLV0P41



Main PWB Connector P1401 to the Panel Voltage and ResistanceMain PWB Connector P1401 to the Panel Voltage and ResistanceDiode Mode values taken with all Connectors RemovedP1401 CONNECTOR "Main" to “The Panel"

1.3V1.6VGSC20

1.3V0VGSP_Rev19

1.3V0.6VGOE18

2.0V8.45VGMA917

2.0V10.4VGMA716

1.4V11.2VGMA615

2.0V12.3VGMA514

2.0V13.4VGMA413

1.36V14VGMA312

1.4V16VGMA211

2.0V14VGMA110

GndGndGnd9

1.6V3.3VVCC8

1.6V3.3VVCC7

GndGndGnd6

2.0V16.55VVDD5

2.0V16.55VVDD4

2.0V16.55VVDD3

Open8.9VLTD_R2

GndGndGnd1


1.3V1.22VRMLV1N40

1.3V1.26VRMLV2P39

1.3V1.19VRMLV2N38

1.3V1.26VRMLV3P37

1.3V1.21VRMLV3N36

1.3V1.23VRMCLKP35

1.3V1.25VRMCLKN34

1.3V1.25VRMLV5P33

1.3V1.19VRMLV5N32

1.3V1.2VRMLV6P31

1.3V1.2VRMLV6N30

1.3V1.21VRMLV7P29

1.3V1.19VRMLV7N28

1.3V1.25VRMLV8P27

0.89V1.2VRMLV8N26

GndGndGnd25

1.5V0.2VSOE24

1.3V1.62VPOL23

1.3VOVGSP22

OpenOVH_CONV21


GndGndGnd60

0.925V(-5V)VGL59

GndGndGnd58

Open26VVGH57

n/cn/cn/c56

2.0V7VVCOM_R55

2.0V2.3VGMA1854

1.4V1.3VGMA1753

1.4V2.3VGMA1652

2.0V3VGMA1551

1.4V4.86VGMA1450

1.5V5.18VGMA1349

2.0V6VGMA1248

1.4V7.93VGMA1047

0.9VOVOPT_P46

1.31V3.23VOPT_N45

GndGndGnd44

1.3V1.26VRMLOP43

1.3V1.20VRMLON42

1.3V1.25VRMLV1P41



Main PWB Connector P1204 to (Ft. IR/LED Control) Voltage and RMain PWB Connector P1204 to (Ft. IR/LED Control) Voltage and Resistanceesistance


P1204 CONNECTOR "MAIN PWB" to P1 "Front IR / LED PWB Assy"

2.17V3.29V0VPOWER On/Off120.6V3.29V3.29V3.3V_ST11GndGndGndGnd10

Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd7

1.13V5.1V5.1V5V ST61.08V3.3V3.3VKey251.08V3.3V3.3VKey14GndGndGndGnd3

1.14V3.3V3.3VSDA21.14V3.3V3.3VSCL1



Main PWB Connector P600 to Speakers Voltage and ResistanceMain PWB Connector P600 to Speakers Voltage and Resistance


SPK-L(+)SPK-L(-)SPK-R(+)SPK-R(-)

LABEL

1.5V10.7V0V41.5V10.7V0V31.5V10.7V0V21.5V10.7V0V1

Diode CheckRunSBYPin

P600 CONNECTOR "Main" to "Speakers"

Use speaker out to test for defective Audio Amp IC600


FRONT CONTROL (IR and INTELLIGENT SENSOR) SECTIONFRONT CONTROL (IR and INTELLIGENT SENSOR) SECTION

The Front Control PWB (located on the bottom left as viewed from the rear) contains the IR (Infrared Remote Sensor) and the Intelligent Sensor plus the front Power LEDs.This board also connects with the Side Key PWB.

This board receives it operating B+ via pin 6 (STBY 5V) and pin 11 (STBY 3.3V) on connector P1. It is received from the Main PWB via the connector P1200.

The Intelligent Sensor communicates with the Video Processor IC100 via clock and data lines on the same connector pins 1 and 2.

The IR pulses (5V p/p) are sent to the Microprocessor (same IC100) via pin 9.

The Key board connector P3000 is routed to the Ft control board via P2. Then through the front Control board and out P2 to the Microprocessor via P1200 pins 4 and 5.

Finally, the front Power LEDs are controlled by pin 12 and pin 8.


FRONT CONTROL BOARD CONNECTIONS IDENTIFIEDFRONT CONTROL BOARD CONNECTIONS IDENTIFIED

The below picture shows the connections to the Front Control board.

SideKey

P3000

P2P1

Main Power Switch

p/n EBR59216901


FRONT CONTROL (IR and INTELLIGENT SENSOR) IDENTIFIEDFRONT CONTROL (IR and INTELLIGENT SENSOR) IDENTIFIED

The Front Control PWB (located on the bottom left as viewed from the rear) contains theIR (Infrared Remote Sensor) and the Intelligent Sensor plus the front Power LEDs.

Intelligent Sensor Infrared Sensor

LightDiffuser

Power LEDs


Ft. IR / LED Control Connector P1 and P2 Voltage and Diode ChecFt. IR / LED Control Connector P1 and P2 Voltage and Diode Checkk


P1 CONNECTOR "Front IR / LED PWB Assembly " to P1204 " MAIN PWB "

Open3.29V0VPOWEROn/Off12

Open3.29V3.29V3.3V_ST11GndGndGndGnd10Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd7

1.13V5.1V5.1V5V ST6Open3.3V3.3VKey25Open3.3V3.3VKey14GndGndGndGnd3Open3.3V3.3VSDA2Open3.3V3.3VSCL1

DiodeCheckRun STBYLabelPin

P2 Connector to “Side Key" P1

Gnd

Open

Gnd

Open

DiodeCheck

GndKey 2Gnd

Key 1

Label

GndGnd43.3V3.3V3GndGnd23.3V3.3V1

Run STBYPin


Side Key AssemblySide Key Assembly

To Ft ControlP3000

SW3008

SW3007

SW3006

SW3005

SW3004

SW3003

SW3002

SW3001

P3000


Side Key Assembly P3000 Voltage and Diode CheckSide Key Assembly P3000 Voltage and Diode CheckP3000 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


EnterMenuInput

Power

KEY

P3000 Voltage Measurements with Key pressed.

CH (Up)CH (Dn)

Volume (+)Volume (-)

KEY

2.24V1.65V

0.906V0.179V


2.24V1.65V

0.906V0.179V


EnterMenuInput

Power

KEY

P3000 Connector “Side Key" to “IR/LED Control PWB“ P1

GndKey2GndKey1

Label

GndOpenGndOpen

Diode Check


Run STBYPin

P3000


Invisible Speaker System Overview (Full Range Speakers)Invisible Speaker System Overview (Full Range Speakers)

The 42LH40 contains the full progression of the Invisible Speaker system.First: The woofer layout is the basic system. The Full Range Speakers point downward, so there is no front viewable speaker grill or air ports.

Tweeterp/n EAB58536001

Full Rangep/n EAB58534502

Tweeter(High Frequencies)

Main Speaker(Full Range Frequencies)

Magnet (Weight)Prevents vibrations


Invisible Speaker System Overview (Tweeters)Invisible Speaker System Overview (Tweeters)

Invisible Speaker has a sticky surface which

adheres to front bezel.

Invisible Speaker Tweetershown separately. The Front (down) has sticky surface which adheres to

front bezel. Note, there is no diaphragm, only voice coil.

OutlinedCircle

SpeakerAttachment

post

Cabinet works as a diaphragm.

2nd: ProgressionElimination of the

conventional speaker.

The front bezel is shown below. Note: the outlined circle is the location for the front sticky pad on the

Invisible Speaker. This prevent the coil from bouncing off the plastic causing vibrations.

WARNING: Removing the Tweeter will destroy the speaker as shown above. The diaphragm/spider is glued to the

front bezel. When removing, it will tear.

Tweeterp/n EAB58536001


Invisible Speaker System OverviewInvisible Speaker System Overview

Invisible SpeakerShown separately. Front (to left) has sticky surface

which adheres to front bezel. Note, there is no Cone (Diaphragm), only

voice coil.Spider

Dust Cap with

adhesive

Voice CoilInside

Magnet

Frequency Pass Capacitor

Mount

Mount

Speaker Wires

Speaker Terminals


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.

The Adobe version of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier.zoom in and out making reading of the small text easier.This Power Point shows a graphical representation of the 11 X 17This Power Point shows a graphical representation of the 11 X 17foldout page so clarity is limited.foldout page so clarity is limited.

42LH40 INTERCONNECT DIAGRAM

SMPS TEST 1: To Force Power Supply On.Disconnect P700 on Main PWB.Jump pin 7,8,9 or 10 (5V) to pin 2 using a 100Ωresistor. (Test Voltage Outputs 12V, and 24V).

SMPS TEST 2: Jump pin 2 to pin 20 (INV-ON).(Backlights and all voltages should turn on).

P1204 CONNECTOR "MAIN PWB" to J1 "Front IR / LED PWB

MAIN (Digital) Board

X10012 Mhz

Q706

LD1000

1

TUNER TU1001

SIF 16

Video 19

(5V) 4

DIF + 12DIF - 13(5V) 15

IC1100Video

ProcessorTru-Motion

Video ResetSW1100

Micro ResetSW100

X100525Mhz

IC704

IC2 X110012 Mhz

P1401 P1400L1301

L1300

D1402

IC705

L718IC706

P700

P1200

IC1300D1400

IC701

D1401

P600

L607

L606IC600

IC601

IC1002

Q105 Q106

IC103

IC502

IC501

D500

IC708

IC1000

IC101

IC1301

IC707L712Q100

IC1202

Q1200

D1204

IC1

L726

L710

IC300

IC301

P1100SoftwareUpgrades

N/C

IC10048vsb/QAM

IC1001

D1100

Q1100

IC102

LD1100

IC105

IC104

IC1201

IC1200

D1223

Q1001

Q1000

Q600

IC702

IC1003

Q1202D102

Q705 Q704Q701

Q703

Q702 D1403IC1101

IC1203

Components that are Grayed out are on the back.

P201 “SMPS" to P700 "Main PWB"

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 IC100.

P201

SK101AC IN

SK100

P401

P402

F100

3.15A/250VRun 380V

STBY 157VFrom Hot Gnd

F501

SMPSSwitch Mode Power Supply

F1006.3A/250V

AC IN

T704

T703

1.2KV

Main Power SWSide (Key) C

ontrols

P1

Front PWB Assembly

IR ReceiverIntelligent Sensor

P3000

P2

IC100Micro and

VideoProcessor

Mstar

Tuner

P2 "Front IR / LED PWB to P3000 Keys

1.2KV

TO TFT MODULE

Pin 2 (-5V)Pin 4 (26V)

Pin 56,57,58 (16V)Pin 53,54 (3.3V)

Pin 3,4,5 (16V)Pin 7,8 (3.3V)

Pin 59 (-5V)Pin 57 (26V)

Component Voltage on Next Page

1 ADIM Pin 21 Fixed and not used

GndKey2GndKey1

Label

GndOpenGndOpen

Diode Check


Run STBYPin

Open3.29V0V120.76V3.29V3.3V_ST11GndGndGndGnd10Open4.8V4.8VIR9GndGndGndGnd8GndGndGndGnd71.5V5.1V5.1V5V ST61.1V3.3V3.3VKey251.4V3.3V3.3VKey14GndGndGndGnd3

1.67V3.3V3.3VSDA2Open3.3V3.3VSCL1


POWER On/Off3.29V

STBYLabel

ncncncnc1

Gnd

nc

Diode Check

GndGndGnd3,4,5,6

2.85V5.14V5.14V5V

GndGndGndGnd

1.2V12.3V0V12V

0.81V21.4V0V24V

ncncncnc19

Open1.66V0V1 A.DIM21

ncncnc23

Run STBYLabelPin

1.19V4.98V0VPWR-On2

2.25V3.8V0VINV.ON20

Open0V0VErr Out22

Open3.2V0V2 PDIM24

7,8,9,10

11,12

13,14GndGndGndGnd15,16

17,18

R406R403

R406 / R403Bottom leg

48Khz53V p/p

250V 82mF

250V 82mF

250V 82m

F

250V 82m

F

1 2

23 24 16V Pin 42 IC1300For Panel

26V Pin 8 IC1300For Panel

-5V Anode D1401For Panel

3.3V Top Side of L1301 For Panel

42LH40 MAIN (BACK SIDE) SIMICONDUCTORSQ1000 Tuner SIF IC1200 HDMI Q1202 Moving LED Q703 Turns on 5V IC104 EEPROM D1403 LVDS 16V D1100 LD1100 (Q1100) D1223 B+ Routing

Pin Pin Pin Driver Pin General Q706 Pin Pin Source Pin Gate Pin RGBE 2.4V [1] Gnd E 0.1V E 0V [1] Gnd A 12.2V A 0V A 5.1VC 0V [2] Gnd C 0V C 0V [2] Gnd K 16.6V K 0.33VV K 4.8VB 3.0V [3] Gnd B 3.3V B 0.62V [3] Gnd A 0V

[4] Gnd [4] GndQ1001 Tuner Video [5] 4.8V IC1003 9V Reg Q704 Turns on [5] 3.25V

Pin analog [6] 4.8V Pin for Tuner Pin Q705 [6] 3.25V IC1203 SPDIF OpticE 2.5V [7] 4.8V [1] 12.3V E 0V [7] 0V PinC 0V [8] 4.8V [2] 8.9V C 0V [8] 3.25V [1] 3.25VB 3.2V [3] Gnd B 0.62V [2] 3.24V

IC1101 Flash IC1100 LD1100 Driver [3] GndIC1201 RS232 Pin Q600 Audio Mute Pin [4] 1.6V

Pin [1] 0V Pin Q705 Turns on LVDS G 0.29V [5] 3.25V[1] 3.3V [2] 1V E 0.1V Pin 12V Q706 D 2.9V[2] 5.6V [3] 3.26V C 3.2V E 0V S 0V[3] 0V [4] Gnd B 0V C 0V[4] 0V [5] 0V B 0.66V[5] 5.5V [6] 0.1V Q701 PWR-On to IC107 Power Det[6] 5.5V [7] 3.26V Pin P700 pin 2 IC105 HDCP EEPROM Pin Reset[7] 5.5V [8] 3.26V E 5.12V Pin [1] 0.0V[8] 0V C 4.99V [1] Gnd [2] 3.3V[9] 3.3V IC702 STBY 3.3V B 3.07V [2] Gnd [3] 3.2V

[10] 3.26V Pin Turned on by Q700 [3] 5.05V[11] 0V [1] Gnd [4] Gnd D102 Audio Mute[12] 3.3V [2] 3.3V Q702 INV-On to [5] 5.05V Pin Routing[13] 0V [3] 5.1V Pin P700 pin 20 [6] 5.05V A 0V[14] 5.6V E 0V [7] 3.25V K 0.1V[15] Gnd C 3.8V [8] 3.25V A 0V[16] 3.3V B 0V

42LH40 MAIN (FRONT SIDE) SIMICONDUCTORSIC701 1.8V DDR IC705 3.3V / 1.26V IC101 Flash Boot IC103 Reset IC707 5V EXT IC1001 3.3V FE

Pin Pin Pin Memory Pin Pin 1.8V MEMC Pin[1] n/c [1] 0.8V [1] 0V [1] Gnd [1] 0.8V [1] 4.9V[2] 3.2V [2] Gnd [2] 3.2V [2] 0V [2] Gnd [2] 4.9V[3] 3.2V [3] 5V [3] 2.5V [3] 3.3V [3] 4.9V [3] Gnd[4] n/c [4] 6.12V [4] Gnd [4] 6.5V [4] 3.36V[5] n/c [5] 4.99V [5] 0V Q105 Power On [5] 4.84V [5] 1.19V[6] 1.8V [6] 1.3V [6] 0V Pin Delay [6] 1.8V[7] 0.79V [7] 1.3V [7] 3.2V E Gnd [7] 1.8V IC1000 Flash Boot[8] Gnd [8] 3.19V [8] 3.2V B 0V [8] 4.83V Pin Memory

C 1.96V [1] 0VIC704 3.3V Reg Q706 5V General IC708 3.3V Reg IC601 1.8V Amp [2] 3.36V

Pin Pin LVDS 12V Pin Q106 Reset Pin [3] 3.36V[1] 0.79V [1] 5.1V [1] Gnd Pin [1] Gnd [4] n/c[2] Gnd [2] Gnd [2] 0.79V E Gnd [2] 1.8V [5] n/c[3] 5V [3] 12V [3] 1.26V B 0V [3] 3.3V [6] 1.19V[4] 7.7V [4] 0.67V [4] 1.26V C 3.3V [7] 0.79V[5] 4.9V [5] 12V [5] 1.8V [8] Gnd[6] 3.3V [6] 12V [6] 5V[7] 3.3V [7] 5V [7] 0V IC1002 5V for Tuner[8] 2.1V [8] 5V [8] 5V Pin

[1] 8.9VD1400 LVDS 16V D1401 LVDS (-5V) D1402 LVDS 3.3V D1204 LED Moving [2] 1.93V

Pin Source Pin Source Pin Source Pin Ft LED [3] 5VA 14.7V A (-5V) A Gnd A 0V [4] n/cJ 20V J (-2.38V) K 3.3V K 0.14V [5] GndK 27V K Gnd A 0V

BC E

G

D

S

J

KA

42LH4042LH40Direct View LCD

This concludes the 42LH40training session.

Lg 42lh40 Training Manual

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