LG 32LG40 User Manual

TRAINING MANUAL

Model : 32LG40 32” CLASS LCD HDTV

Direct View LCD

With built in DVD Player

32LG40

w/ BUILT-IN DVD PLAYER

(31.5" diagonal)

Original 08/12/2008

Updated 10/13/2010

OUTLINE

Section 1

Section 2

Contact Information, Preliminary Matters, Specifications, LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages

Circuit Board Operation, Troubleshooting of :

• Switch mode Power Supply

• Main (Digital) Board

•T-CON Board

•Ballast Board

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LCD DV August 2008 32LG40

Overview of Topics to be Discussed

32LG40 LCD Direct View Display

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.

Section 1

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 remove and replace safely any Circuit Board or Assembly.

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LCD DV August 2008 32LG40

Preliminary Matters (The Fine Print)

Important 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.

Caution

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.

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LCD DV August 2008 32LG40

(Electrostatic Static Discharge)

ESD Notice

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 repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

Regulatory 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.

(Electrostatic Static Discharge)

assembly by its edges only. When

5

LCD DV August 2008 32LG40

LG Contact Information

Customer Service (and Part Sales) (800) 243-0000

Technical Support (and Part Sales) (800) 847-7597

USA Website (GSFS) http://gsfs-america.lge.com

Customer Service Website http://www.us.lgservice.com

Knowledgebase Website http://lgtechassist.com

LG Web Training https://lge.webex.com

LG CS Academy http://ln.lge.com/ilearn

LCD-DV:

PLASMA:

PDP Panel Alignment Handbook, Schematics with Bookmarks

32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80, 47LG90, 47LH85, 42LE5500, 47LE8500

42PG20, 42PJ350, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK250, 50PK750, 50PS80, 50PS60, 60PK750, 60PS11, 60PS60, 60PS80

Also available on the Plasma Page:

Plasma Control Board ROM Update (Jig required)

Published August 2008 by LG Technical Support and Training

LG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

New: 2010 Models Software Downloads Technical Assistance

Presentations with Audio/Video and Screen Marks

http://136.166.4.200

New Training Materials on

the Learning Academy site

6

LCD DV August 2008 32LG40

OVERVIEW SECTION

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.

Checking Points to be Considered

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…

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LCD DV August 2008 32LG40

Basic 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 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 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 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.

After carefully checking the symptom and determining the circuits to be

To further isolate the failure, check for the proper waveforms with the

The final step is to correct the problem. Be careful of ESD and make sure to

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LCD DV August 2008 32LG40

32LG40 Product Information

This section of the manual will discuss the specifications of the 32LG40

“Thin” LCD Direct View Display Panel.

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LCD DV August 2008 32LG40

Side View

Basic Specifications

•720p HD Resolution

• 12,000:1 Dynamic Contrast Ratio

• Side-loading Progressive Scan DVD Player

• Super Multi-Format

• 3x HDMI™ 1.3

• AV Mode (Cinema, Sports, Game)

• Clear Voice

• SimpLink™ Connectivity

• Invisible Speaker System

• Expert Mode

• PC Input

• Swivel Stand (Manual)

10

LCD DV August 2008 32LG40

Pixel Count to Resolution Comparisons

NTSC

SD

HD HD

HD

720P Logo

HD RESOLUTION 720p HD Resolution Pixels: 1365 (H) × 768 (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.

720P Panel

FORMATS

480I 480P

1080I 720P

1080P

Interlaced Progressive

Progressive

240 Lines 480 Lines

540 Lines 720 Lines

1080 Lines

768

BASIC

PIXEL COUNTS

720P Panel

1365 (H) × 768 (V)

Possible Frame Rates: 24FPS 30FPS 60FPS

Interlaced 2 Fields to make a Frame

1080P Panel

Progressive

1920 (H) x 1080 (V)

Each Field is a Frame

Think of sync as the Panels “Refresh Rate”

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LCD DV August 2008 32LG40

Basic Specifications

LG SIMPLINK™ MULTI-DEVICE CONTROL

Allows for convenient control of other LG SimpLink products using the existing HDMI connection.

HDMI (1.3 Deep Color) Digital multi-connectivity

HDMI (1.3 Deep color) provides a wider bandwidth (340MHz,

10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors, and also drastically improves the data-transmission speed.

BUILT-IN SIDE LOADING PROGRESSIVE SCAN DVD PLAYER

Save space with the built-in progressive scan DVD player. Side loading player upconverts DVDs to near 720p resolution and features LG “Super-Multi” technology which plays back almost any recordable disc based media.

INVISIBLE SPEAKER SYSTEM

LG’s 2008 line of TVs include a unique invisible speaker system, tuned by renowned audio expert, Mr. Mark Levinson. Speakers are embedded in strategic spots behind the front cabinet and use minute vibrations to turn the entire front bezel into the speaker system. The result is a clean, polished look, and enhanced audio by increasing the “sweet spot” giving a wider sound field.

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LCD DV August 2008 32LG40

Basic Specifications

AV Mode "One click" - Cinema, Sports, Game mode.

TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 3 different modes of Movies, Video Games and Sports by a single click of a remote control.

Clear Voice Clearer dialogue sound

Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells.

Save Energy, Save Money

Home electronic products use energy when they're off to power features like clock displays and remote controls. Those that have earned the ENERGY STAR use as much as 60% less energy to perform these functions, while providing the same performance at the same price as less-efficient models. Less energy means you pay less on your energy bill. Draws less than 1 Watt in stand by.

13

LCD DV August 2008 32LG40

Remote Control

p/n: MKJ40653818

BOTTOM PORTION

TOP PORTION

FAV

VOL CH

MUTE

1 2 3

4 5 6

7 8 9

0

P A G E

14

LG

LCD DV August 2008 32LG40

Rear and Side Input Jacks

Current Software Release

32LG40-UA-v03.12_080711_Download.epk

Optical AudioRGB (PC) Audio

HDMI

Remote

In

RGB (PC)

Component

Y Pr/Pb

Composite

RS232

Service Only

Audio

Out

Side Input Jacks

USB

HDMI

Composite

A/V

Main Board

Orientation

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LCD DV August 2008 32LG40

Accessing the Service Menu

REMOTE

TOP PORTION

To access the Service Menu.

1) Turn the Set On

2) 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

SIDE KEYS

Note: Dependant upon the Software Version, a Password

may be required to enter the Service Menu.

If a password is required, enter

0000

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LCD DV August 2008 32LG40

Software Upgrade Procedure

1) Create an LG_DTV folder on the USB Flash Drive

Shows the

Currently

Installed

Version

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.

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.

17

LCD DV August 2008 32LG40

32LG40 Product Measurements

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LCD DV August 2008 32LG40

TROUBLESHOOTING SECTION

This section of the manual will discuss troubleshooting.

Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems.

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LCD DV August 2008 32LG40

Removing the Back Cover

The Stand does not need to be removed. Remove the 18 screws shown by arrows.

Pay attention to the size and type of screw as there are many different types.

Putting in the improper screw when reassembling may Cause damage.

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LCD DV August 2008 32LG40

Circuit Board Layout

Ballast p/n

EAY56797501

Panel p/n EAJ41825601

T-CON p/n

EAT56801301

LVDS

Cables

Side

Controls

Speakers

21

Side

Inputs

Speaker rattle.

1) Tighten screws at bottom of cabinet

2) Tighten screws holding woofers

LCD DV August 2008 32LG40

Invisible Speaker System Layout

Woofers

Tweeters Tweeters

Speaker rattle.

1) Tighten screws at bottom of cabinet

2) Tighten screws holding woofers

Bottom View of Woofer Ports

Stand Removed

22

LCD DV August 2008 32LG40

POWER SUPPLY

SECTION

SMPS Board Layout

Error WM-D1 INV On/Off BR1 Gnd Gnd Gnd Gnd Gnd 24V 24V 24V 24V 24V

P203

To Ballast

14 13 12 11 10 9 8 7 6 5 4 3 2 1

n/c

1 2

1

P201

23 21 19 17 15 13 11 9 7 5 3 1

To Main

Fixed Volts BR1 POWER-ON ERROR Gnd Gnd

5.2V

5.2V Gnd 12V Gnd

16.5V

24 22 20 18 16 14 12 10 8 6 4 2

n/c PWR-DIM INVOn/Off ACD Gnd Gnd

5.2V

5.2V Gnd 12V Gnd

16.5V

F101

3.15A/250V

334V Actual

F100

5A/250V

AC IN

23

Hot Ground

LCD DV August 2008 32LG40

Power Supply (SMPS)

Board Drawing

To Ballast

Error WM-D1 INV On/Off BR1 Gnd Gnd Gnd Gnd Gnd 24V 24V 24V 24V 24V

14 13 12 11 10 9 8 7 6 5 4 3 2 1

P203

P201

To Main

16.5V Gnd 12V Gnd

5.2V

5.2V Gnd Gnd ACD INVOn/Off PWR-DIM n/c

2 4 6 8 10 12 14 16 18 20 22 24

16.5V

1

Gnd

3

12V

5

Gnd

7

5.2V

9

5.2V

11

Gnd

13

Gnd

15

ERROR

17

POWER-ON

19

BR1

21

fixedV

23

F100

5A/250V

AC IN

24

F101

3.15A/250V

334V Actual

LCD DV August 2008 32LG40

Power Supply P201 Control Signals from Main Board P800

25

LCD DV August 2008 32LG40

Power Supply Board Test (1) All Board Disconnected

P201 Connector disconnected from the Main Board AC: Not applied when adding jumper. Applied when making test.

The Power Supply “MUST” be producing STAND-BY +5V before proceeding.

With Power Supply disconnected from other Boards and AC applied, confirm

that the Power Supply is producing 5V from either Pins 9, 10, 11 or 12. If not, check fuse. If fuse OK and no 5V, replace Power Supply. If 5V OK then continue.

1st short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K

resistor.

+5V

This turns on the power supply. Confirm that the other low voltage power supplies are activated.

Pins 1 and 2 (16V) Pins 5 and 6 (12V) Pin 18 (AC Detect) goes high Fuse F101 Check for 350V (Ballast Voltage)

If any voltage missing, replace Power Supply.

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LCD DV August 2008 32LG40

Power Supply Board Test (2) Checking the Backlights

P2 Connector disconnected from the Main Board AC: Not applied when adding jumper. Applied when make test.

If the 1sttest was successful, continue. Leave original 10K in place.

2nd: To test the Backlights, leave the 10K jumper in place. Plug up the Back light plug P203. Apply AC Power.

Observe the Backlights. If normal, LED1 on the Ballast Board should turn on first, then backlights should turn on and LED1 should go off..

+5V

If no backlight activity, confirm the Fuse F101 has approx. 350V on both sides. If on one side, check fuse for open. If no 350V, replace Power Supply.

If 300V present, check P203 for 24V on Pins 1~5. Check P203 Pin 12 for at least 3V (Inverter On/Off).

If yes, confirm Connectors to backlight OK, if OK, then panel defective.

Ballast will not run if either of the Backlight plugs are removed.

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LCD DV August 2008 32LG40

Power Supply Board Removal

Disconnect P203, P201 and AC In Remove the 4 screws indicated in the red circles.

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LCD DV August 2008 32LG40

Power Supply Connector P201 Odd Pins Voltage and Diode Check

P201 "SMPS" to P800 "Main Board"

Run STBYLabelPin

Diode

Check

OL3.2V0VN/C23 OL1.68V0VBR121 OL2.86V0VPWR19

1.26VGndGndERR17 GndGndGndGnd15 GndGndGndGnd13

0.34V5.15V5.15V5.2V11

0.34V5.15V5.15V5.2V9 GndGndGndGnd7

1.69V11.8V0V12V5 GndGndGndGnd3

0.31V16V0V16.5V1

Run STBYLabelPin

Diode

Check

OL0V0VN/C24 OL3.38V0VPWM-DIM22 OL3.29V0VINV On/Off20

OL4.57V5.05VACD18 GndGndGndGnd16 GndGndGndGnd14

0.34V5.15V5.15V5.2V12

0.34V5.15V5.15V5.2V10 0VGndGndGnd8

1.69V11.8V0V12V6

GndGndGndGnd4

0.31V16V0V16.5V2

Resistance taken in Diode Mode with Connectors Removed

29

LCD DV August 2008 32LG40

Power Supply Connector P203 Voltage and Diode Check

P203 "SMPS" to MCN1 "Ballast Board"

Run STBYLabelPin

Diode

Check

0.33V24.52V0V24V1

0.33V24.52V0V24V2

0.33V24.52V0V24V3

0.33V24.52V0V24V4

0.33V24.52V0V24V5 GndGndGndGnd6 GndGndGndGnd7 GndGndGndGnd8 GndGndGndGnd9 GndGndGndGnd10

OL1.67V0VBR111 OL3.45V0VINV On-Off12

Resistance taken in Diode Mode with Connectors Removed

30

OL3.40V0VPWM-DIM13 OL0V0VERROR14

LCD DV August 2008 32LG40

MAIN BOARD SECTION

P902 P200

LVDS To T-CON

No Connection Software Download

To

Power

P800

To DVD

P901

To DVD

P900

To DVD

P904

To

Ft Keys

P401

To SPK

IC809 A2.6V BCM Reg

Reset

BCM

IC400 BCM Reset

IC407 Micro

X400

24Mhz

Q400 Micro Reset

IC405 Micro Reset

Q802 5V Sub Switch Control

Q801 5V

Sub Switch

LD800

IC806 A3.3V

BCM

IC602 HDMI EDID

IC601 HDMI EDID

IC802 3.3V Reg

IC600

HDMI Selector

IC302

IC300

Dual Data

Registers

IC100

BCM

IC303

Audio Selector

IC301

IC502

Memory

X200

54Mhz

IC101

Flash

BCM

IC304

DDR VTT

Q800 SIF

IC800 CVBS

Amp

TUNER

IC402

Serial Port

Interface

IC807 5V Reg

IC803 9V Reg

IC201

USB

3.3V

If odd Video

problems are

found, use some

freeze spray

about IC100 and

its circuits,

If video returns to

normal, Board

needs to be

replaced.

USB

HDMI

Side Inputs

P500

IC501 Audio Processor

and Output

16V Pins 49~52

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LCD DV August 2008 32LG40

Main Board (Front Side) Regulator Checks 1 of 2

RESET GENERATOR FOR Q400 Micro ResetIC405USB PowerIC201

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

3.41V3.41V3.3V_MICONIN15V0V+5VIN2

GndGndGndGnd23.4V0VBCM DDR PowerOn/Off Control3

0.6V0.6VReset (Lo-Hi)OUT35V0VUSB_PWR_Out_1OUT7

+3.3V Regulator (3.3V TMDS_SW)IC8023.1V0V+3.3VOUT8

RUNSTBYNAMEFUNCTIONPIN2.6V BCMIC304

5V0V+3.3VGnd1RUNSTBYNAMEFUNCTIONPIN

GndGndGndOUT21.29V0VDDRO_VTTOUT3,8

3.2V0V+5V_SUBIN32.6V0VD2.6V_BCMIN5,6,7

+9V RegulatorIC8031.29V0VDDRO_VTTOn/Off Control4

RUNSTBYNAMEFUNCTIONPINRESET GENERATOR TO IC401 3.3BCM (On Back)IC400

12V0V+12VIN1RUNSTBYNAMEFUNCTIONPIN

GndGndGndGnd23.4V0VD3.3V_BCMIN1

9V0V+9VOUT3GndGndGndGnd2

3.39V0VReset (Lo-Hi)OUT3

32

LCD DV August 2008 32LG40

Main Board (Front Side) Regulator Checks 2 of 2

5V SUB SWITCHQ801D3.3V/A3.3V_BCM Regulator turns on LD800IC806

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

5V0VST_5VIN1,33.4V0VPower_CTL_3.3VOn/Off Control1

0.28V0VQ802On/Off Control2,45V0.36V+5V_SUBIN2 5V0V+5V_SUBOUT5,6,7,8GndGndGndGnd3

CONTROLLER for 5V SUB SWITCH Q801Q8023.4V0.1VD3.3V_BCMOUT4

RUNSTBYNAMEFUNCTIONPIND3.3V/A3.3V_BCM RegulatorIC807

3.29V0VRL_ONOn/Off ControlBRUNSTBYNAMEFUNCTIONPIN 5V0VST_5VPull DownC8.9V0V+9VIN1

GndGndGndGndE3.4V0VPower_CTL_3.3VOn/Off Control2

RESET GENERATOR FOR MICRO IC 407Q4005V0V+5VOUT3

RUNSTBYNAMEFUNCTIONPINn/cn/cn/cn/c4

0.6V0.6VResetResetBGndGndGndGnd5 0V0V3.3VVST_MICONVccCD2.6V/A2.6V_BCM RegulatorIC809

GndGndGndGndERUNSTBYNAMEFUNCTIONPIN

4.98V0.36V+5V_SUBIN6,7,8,10

3.41V0VPower_CTL_2.6VOn/Off Control17

2.66V0VD2.6V_BCMOUT1,2,3,4,5 n/cn/cn/cn/c14,15

GndGndGndGnd11,18,19,20

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LCD DV August 2008 32LG40

Main Board (Back View) Regulator Layout

IC401 BCM Reset

P902P200

Q901 LVDS 12V Switch

IC808

3.3V Micon

P800

Q900

Turns on Q901

P901

Side

Inputs

IC701

Side

HDMI

EDID

TUNER

TU800

IC408 SIF Select DVD/BCM

16

X200

IC805 A1.2V BCM Reg

Silk Screen for Pin 1 wrong IC805

IC102

1

HDCP

KEY

IC403

NVRAM

IC702

EEPROM

IC406

Micro

EEPROM

IC801 1.8V Reg

P900

P904

P401

P500

34

LCD DV August 2008 32LG40

Main Board (Back Side) Regulator Checks

ST-BY 3.3V DC-DC CONVERTERIC808BCM RESETIC401

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

5V5VST_5VIN23.41V0VD3.3V_BCMIN14

3.43V3.43V3.3VST_MICONOUT33.4V0VReset from IC400On/Off Control1 GndGndGndGnd43.4V0VBCM_RESETOUT6

LVDS 12V SWITCH CONTROLLER Q901Q900+1.8V_NTP REGULATORIC801

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

0.75V0VLVDS_PANEL_CTRLControlBGndGndGndGnd1

0V0VLVDS Switch ControlPull Down 12VC1.8V0V'+1.8V_NTPOUT2 0V0VGndGndE3.29V0.26V3.3V_TMDS_SWIN3

LVDS 12V SWITCHQ901D1.2V/A1.2V BCM REGULATORIC805

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

11,12,18,

19,20

Screen Print for Pin No is incorrect, use IC

12.36V0V12VIN1,35V0.38V+5V_SUBIN6,7,8,10

6.16V0VQ900On/Off Control2,43.41V0VPower_CTL_1.2VOn/Off Control17

12.36V0VLVDS 12VOUT5,6,7,81.29V0VD1.2V_BCMOUT1,2,3,4,5

0V0Vn/cn/c13, 14,15,16

GndGndGndGnd

35

LCD DV August 2008 32LG40

Main Board X400 and X200 Check

IC407

Micro

Main Board

X400 Location

1.49V

X400

2.4Vp/p 24Mhz

With set on or off

TP Use Crystal leg top or bottom

X200

660mVp/p

54Mhz

MAIN

Board

Main Board

X200 Location

36

1.49V

1.49V Only when set is on

TP Use Crystal Side R232 or R233

LCD DV August 2008 32LG40

Main Board Tuner Video and SIF Output Check Pin Location

For Easy Access, pop the shield off the tuner

Pin 16 Composite Video

Pin 14 Audio SIF

Pin 3 Tuner B+ (5V)

If you leave the shield on you can

37

still access the same pins.

Be careful not to accidentally

ground out your test lead on the

shield.

LCD DV August 2008 32LG40

Main Board Tuner Video and SIF Output Check

Using SMTP Color Bar Input

Pin 14

“SIF”

Signal

850mVp/p

Using SMTP Color Bar Input

MAIN

Board

Tuner

Location

Pin 16

“Video”

Signal

38

1Vp/p 20uSec rate

LCD DV August 2008 32LG40

Main Board LVDS P902 Output Check

To confirm that the Main Board is outputting Pictur e Content signals, check P902 (LVDS) cable for output. Check 11~20. This signals vary from each other, but looking for signals like the ones shown below on any of these pins confirm the output of video content. This signal is using standard SMTE Color Bar output from a generator as the input source.

Remember there are actually 10 pins with LVDS signals. This only represents two Waveforms as an example.

P902

Location

MAIN

Board

Pin 11

Pin 16

39

LCD DV August 2008 32LG40

Main Board Removal

Remove the Right side decorative plastic piece by removing top and bottom screws. Remove the remaining 6 screws that remove the “Shield” covering the Main Board. Careful at this point, the Board will Swing free of the supports.

Disconnect P902, P800, P901, P900, P904, P401 and P500 Note: In the top right is a Connector P200. This is an open connection. (Software Upgrades) Remove the 2 screws securing the Side input decorative plastic piece on the right. Remove the 4 screws securing the Main Board indicated below in red.

40

LCD DV August 2008 32LG40

Main Board Connector P800 Voltage and Diode Check

P800 Connector "Main" to P201 "SMPS Board"

Diode CheckRun STBYLabelPin

OL16V0V16V1, 2

GndGndGndGnd3, 4

3.03V11.8V0V12V5, 6 GndGndGndGnd7, 8

1.23V5.15V5VST-5V9, 10

1.23V5.15V5VST-5V11, 12 GndGndGndGnd13, 14 GndGndGndGnd15, 16

OL3.3V0VVBR-B 5V-MNT17

Resistance taken in Diode Mode with Connectors Removed

41

OL4.57V5VAC-DET18

1.25V2.86V0VRL-ON19

2.15V3.29V0VINV-On/Off20

OL1.68V0VBR121

2.15V3.38V0VVBR-B22

OL3.2V0Vn/c23 OL0V0Vn/c24

LCD DV August 2008 32LG40

Main Board Connector P902 LVDS Layout and 12V Circuit

For Locations See Main Board Back Side View

LVDS 12V

Panel Control from IC407 Pin 33 Q900 turns on Q901 LVDS Switch generating LVDS 12V All voltages are shown on the Interconnect Diagram

LVDS Signal

Waveforms

Shown on back of

Interconnect

Diagram

42

LCD DV August 2008 32LG40

Main Board Connector P902 Even Pins Voltage and Diode Check

P902 Connector "Main" to CN1 “T-CON Board"

RunSBYLabelPin

Diode

Check

OL12.3V0VLVDS 12V1

OL12.3V0VLVDS 12V3 Gnd0V0VGnd5 Gnd0V0VGnd7 Gnd0V0VGnd9

0.98V1.2V0VLVDS11

1.11V1.2V0VLVDS13

1.06V1.1V0VLVDS15

1.11V1.08V0VLVDS17

1.11V1.14V0VLVDS19 OLn/c0Vn/c21

Gndn/c0Vn/c23

RunSBYLabelPin

Diode

Check

OL12.3V0VLVDS 12V2

OL12.3V0VLVDS 12V4 Gnd0V0VGnd6 Gnd0V0VGnd8 Gnd0V0VGnd10

0.98V1.1V0VLVDS12

1.06V1.05V0VLVDS14

1.05V1.09V0VLVDS16

1.06V1.13V0VLVDS18

1.06V1.06V0VLVDS20 OLn/c0Vn/c22 OLn/c0Vn/c24

3V3.07V0.4VSize Sel25

Resistance taken in Diode Mode with Connectors Removed

43

Gnd0V0VGnd26

LCD DV August 2008 32LG40

Main Board Connector P401 Voltage and Diode Check

P401 Connector "Main Board" to "Front Keys"

Run STBYLabelPin

Diode

Check

1.4V3.4V3.4VKEY31

1.4V3.4V3.4VKEY42 Gnd0V0VGnd3 Gnd0V0VGnd4

1.4V3.4V3.4VKEY-15

1.4V3.4V3.4VKEY-26

OL0V0Vn/c7

0.53V5V5VST-5V8

0.8V0V0VPWM-LED9

2.3V4.1V4.1VIR10

OL0V0Vn/c11

Gnd0V0VGnd12

Resistance taken in Diode Mode with Connectors Removed

44

0.8V2.1V0VLED-G13

0.8V0V2.1VLED-R14 Gnd0V0VGnd15

LCD DV August 2008 32LG40

Main Board Connector P904 Voltage and Diode Check

P904 Connector "Main" to CN401 "DVD Player"

RunSBYLabelPin

Diode

Check

OL3.34V3.34Vn/c1

1.60V* 3.3V*3.3VDisc Chedk2

OL3.3V3.34Vn/c3 OL3.3V3.34Vn/c4

GndGnd0VGnd5

OL0.8V0VPr6 OL0.8V0VPb7 OL0.6V0VY8

Gnd0V0VGnd9

OL0V0Vn/c10

Gnd0V0VGnd11

RunSBYLabelPin

Diode

Check

OL0.7V0Vn/c14 OL0V0Vn/c15

0.83V1.8V3.38VDVD-SPDIF16 OL0V0VDVD-MUTE17

OL2.4V0VDVD-L-In218

Gnd0V0VGnd19

OL2.4V0VDVD-R-In220

OL0V0Vn/c21

Gnd0V0VGnd22

OL0V0Vn/c23 OL0V0Vn/c24

0.83V0V0Vn/c12 Gnd0V0VGnd13

*Pin 2: 3.3V With Disc Player and 0V No Disc Player

Resistance taken in Diode Mode with Connectors Removed

45

Gnd0V0VGnd25

OL0V0Vn/c26

LCD DV August 2008 32LG40

Main Board Connectors P900, P901, P500 and P200 Voltage and Diod

e Check

P900 Connector "Main" to P402 "DVD Player"

Diode CheckRunSBYLabelPin

1.68V*3.4V*3.4VDisk-Enable1

*Pin 1: 3.4V with No Disc and 0V with Disc inserted

P500 Connector "Main" to "Speakers"

Diode CheckRunSBYLabelPin

2.78V8.14V0VR+1

2.78V8.14V0VR-2

P901 Connector "Main" to CN400 "DVD Player"

Diode CheckRunSBYLabelPin

3V12.3V0V12V1 3V3.08V0.7VDVDP-RXD2 3V3.4V0.7VDVDP-TXD3

Gnd0VGndGnd4

P200 Connector "Main" Software Download

Diode CheckRunSBYLabelPin

OL5V0VVcc1 OL5V0VSCL2

Gnd0V0VGnd2

.099V3.37V3.4VDVDP 3.3V3

Gnd0V0VGnd4 Gnd0V0VGnd5

0.45V5.010V5V6

2.78V8.15V0VL+3

2.78V8.15V0VL-4

Resistance taken in Diode Mode with Connectors Removed

46

OL5V0VSDA3

Gnd0V0VGnd4

LCD DV August 2008 32LG40

BALLAST SECTION (With Shield) LAYOUT

Ballast Start Det LED

(LED1)

p/n EAY56797501

MCN1

F1

8A/125V

To Backlight

Left Side

Transformers

47

To Backlight

Right Side

LCD DV August 2008 32LG40

Ballast Board Assembly Layout

Ballast Start Det

LED LED1

MCN1

F1

8A/125V

To Backlight

Left Side

Transformers

48

To Backlight

Right Side

LCD DV August 2008 32LG40

Ballast Transformer Waveforms

22.2V p/p 220kHz

Primary

Side

T1/T2 Pin 1

34V p/p 64.89kHz

T1/T2 Pin 6



Warning,

secondary is

over 1.2Kv

Transformers

49

LCD DV August 2008 32LG40

Ballast Control Signals from Main Board P800

50

LCD DV August 2008 32LG40

Backlight Drive

Signal Effects

PWMDIM

manipulates

the Burst

Triangle

Oscillator in

the ballast

drive IC.

ADIM also

manipulates

the Burst

Triangle

Oscillator

But it is not

used.

Waveform

Just for Explanation, taken from a

different chassis.

51

LCD DV August 2008 32LG40

Ballast Removal (Heat Sink and Insulators)

Heat Transfer Material

Protects the

Outputs

Sh

p/n EAY56797501

i

e

l

d

Be sure to

replace “All”

materials and

insulators.

Alignment

heat sink

Notch

Insulator

Shiny Side

Down

(Conductive)

52

Cut Out

Alignment Notch

LCD DV August 2008 32LG40

Ballast Connector MCN1 Voltage and Diode Check

MCN1 "Ballast" to P203 "SMPS"

Diode CheckRun STBYLabelPin

OL24.52V0VVBL1 OL24.52V0VVBL2 OL24.52V0VVBL3 OL24.52V0VVBL4

OL24.52V0VVBL5 GndGndGndGnd6 GndGndGndGnd7 GndGndGndGnd8

Resistance taken in Diode Mode with Connectors Removed

53

GndGndGndGnd9 GndGndGndGnd_110

OL1.67V0VBVR_A11

OL3.45V0VOn/Off12

OL3.40V0VVBR_B13 GndGndGndGnd_214

LCD DV August 2008 32LG40

CON (TFT DRIVE) SECTION

TT--CON (TFT DRIVE) SECTION

CON (TFT DRIVE) Board Removal)

TT--CON (TFT DRIVE) Board Removal)

Remove One Screw at the to of the Brace

then Remove LVDS and three screws.

Remove

Screw

Remove

Screw

Remove

Screw

CN1 LVDS

To Main

54

LCD DV August 2008 32LG40

CON (TFT Drive) Board Layout

TT--CON (TFT Drive) Board Layout

Remember to put the three screws

To TFT Panel To TFT Panel

CN2 CN3

back in for ground purposes.

12V

p/n EAT56801301

US2

F1

6.3V/1.5A

Use the Connector P902 on Main

Board for Voltages and Signal

Readings

CN1 LVDS

To Main

55

US2

3) 0.0V

2) 1.8V

1) 3.3V

LCD DV August 2008 32LG40

CON (TFT Drive) Board DC to DC Converter Voltages for Panel

TT--CON (TFT Drive) Board DC to DC Converter Voltages for Panel

US1 Voltages

DCPinDCPinDCPin

6.0V331.2V176.6V1 0V344.3V186.6V2 0V350V192.4V3 0V360V200.7V4

12.0V371.2V211.9V5

12.0V3811.3V223.3V6

15.0V393.3V235.4V7 0V403.3V2419.708

US1 Voltages

The voltages developed by US1 are used on the T-CON and for the X and Y drivers inside the TFT panel.

* The Voltages on CN2 and CN3 must be present for the panel to operate.

56

1.2V4112.0V2521.0V9

15.0V4212.0V261.2V10

15.0V4312.0V270V11

6.6V44V0V284.8V12

6.6V454.3V2915.0V13

6.6V461.8V306.9V14 0V47.6V310V15

6.6V483.3V320V16

LCD DV August 2008 32LG40

CON Board Removal (LVDS Removal)

TT--CON Board Removal (LVDS Removal)

Disconnect CN1 LVDS Cable CAUTION: When removing LVDS Cables, be careful. Press the release Tabs to avoid damage to Board or to the Cable itself.

Press in Press in

LVDS Connectors

Press in from the sides and lift out.

57

LCD DV August 2008 32LG40

CON Board Connector CN1Voltage and Diode Check

TT--CON Board Connector CN1Voltage and Diode Check

CN1 Connector "T-CON" Odd to P902 "Main"

Use P902 on the "Main" Board for making Voltage, Diode Mode and Waveform Checks

Outside Pins are Ground and not counted

Press Tabs to Release

RunSBYLabelPin

Diode

Check

RunSBYLabelPin

Diode

Check

2.9V12.3V0VLVDS 12V22.9V12.3V0VLVDS 12V1

2.9V12.3V0VLVDS 12V42.9V12.3V0VLVDS 12V3 Gnd0V0VGnd6Gnd0V0VGnd5 Gnd0V0VGnd8Gnd0V0VGnd7 Gnd0V0VGnd10Gnd0V0VGnd9

0.88V1.1V0VLVDS120.88V1.2V0VLVDS11

0.88V1.05V0VLVDS140.88V1.2V0VLVDS13

0.88V1.09V0VLVDS160.88V1.1V0VLVDS15

0.88V1.13V0VLVDS180.88V1.08V0VLVDS17

0.88V1.06V0VLVDS200.88V1.14V0VLVDS19 n/cn/c0Vn/c22n/cn/c0Vn/c21 n/cn/c0Vn/c24n/cn/c0Vn/c23

Resistance taken in Diode Mode with Connectors Removed

58

Gnd0V0VGnd26OL3.07V0.4VSize Sel25

LCD DV August 2008 32LG40

DVD Connector Information

The following section covers the Interconnection Voltages and

Resistance checks between the DVD Player and the Main

Board.

59

LCD DV August 2008 32LG40

DVD Player Removal (1 of 2)

Remove the 8 Screws Holding the DVD Player in place

Remove

Tape

60

LCD DV August 2008 32LG40

DVD Player Removal (2 of 2)

Disconnect CN400, CN401 and CN402

CN403 Not Used

CN402

CN401

This screw hidden by tape in previous

photo (Step2).

CN400

61

LCD DV August 2008 32LG40

DVD Player Removed

Set will work with DVD Player removed

62

LCD DV August 2008 32LG40

DVD Connector CN401 Voltage and Diode Check

CN401 Connector "DVD" to P904 "Main"

Diode CheckRunSBYLabelPin

3.13V3.34V3.34Vnc1

3.13V*3.4V*3.3VCheck2

3.13V3.3V3.34Vnc3

2.34V3.3V3.34Vnc4 GndGndGndGnd5

OL0.8V0VDVDP-Pr6 OL0.8V0VDVDP-Pb7 OL0.6V0VDVDP-Y8

OLGndGndGnd9 OL0V0Vnc10

Gnd0V0VGnd11

0.15V0V0Vnc12 Gnd0V0VGnd13

Diode CheckRunSBYLabelPin

0.15V0.7V0Vnc14 Gnd0V0Vnc15

OL1.8V3.38VSPDIF16

2.3V0V0VDVDP-MUTE17

1.1V2.4V0VDVDP-L18

Gnd0V0VGnd19

1.1V2.4V0VDVDP-R20

OL0V0Vnc21

Gnd0V0VGnd22

OL0V0Vnc23 OL0V0Vnc24

Gnd0V0VGnd25

OL0V0Vnc26

*Pin 2: 3.4V With Disc Player and 0V No Disc Player

NOTE: If the DVD Player fails, or if any Connector

from the DVD Player is open, when selecting the DVD

player as the input, it will show “No Signal” error.

Resistance taken in Diode Mode with Connectors Removed

63

LCD DV August 2008 32LG40

DVD Connector CN400 and CN402 Voltage and Diode Check

CN400 Connector "DVD" to P901 "Main"

CN402 Connector "DVD" to P900 "Main"

Diode CheckRun STBYLabelPin

3.22V12.3V0VP12V1 GndGndGndGnd2

0.78V3.37V3.4VP3.3V3 GndGndGndGnd4 GndGndGndGnd5

1.2V5V0VP5V6

*Pin 1: 3.4V with No Disc and 0V with Disc inserted

Diode CheckRun STBYLabelPin

OL*3.4V*3.4VGP1011

OL3.08V0.7VTXD12 OL3.4V0.7VRXD13

GndGndGndGnd4

Resistance taken in Diode Mode with Connectors Removed

64

LCD DV August 2008 32LG40

FRONT IR BOARD SECTION

The following section covers the Interconnection Voltages

and Diode Mode checks between the Front Board and the

Main Board and the Front Board and the Side Key Board.

65

LCD DV August 2008 32LG40

Front Board Assembly Layout

ZD1

5V Zener

ZD2

4.1V Zener

J2

To Side Keys Board

ZD3

3.4V Zener

66

J1

To Main Board

LCD DV August 2008 32LG40

Front Board Assembly Rear View Layout

POWER

LED

IR Receiver

67

POWER

BUTTON

LCD DV August 2008 32LG40

Front Control Connectors J1 and J2 Voltage and Diode Check

J1 "Front Board" to P401 "Main"

J2 "Front Board" to P101 "Side Key"

Diode CheckRun STBYLabelPin

OL3.4V3.4VKEY31

OL3.4V3.4VKEY42 Gnd0V0VGnd3 Gnd0V0VGnd4

OL3.4V3.4VKEY-15

OL3.4V3.4VKEY-26

OL0V0Vn/c7

2.7V5V5VST-5V8

2.4V0V0VPWM-LED9 OL4.1V4.1VIR10 OL0V0Vn/c11

Run STBYLabelPin

Diode

Check

OL3.4V3.4VKey 11

Gnd0V0VGnd2

OL3.41V3.41VKey 23

Gnd0V0VGnd4

OL3.41V3.41VKey 35

Gnd0V0VGnd6

OL3.41V3.41VKey 47

Gnd0V0VGnd8

With all Connectors Removed, Resistance taken in Diode Mode.

Gnd0V0VGnd12

3.2V2.1V0VLED-G13

3.2V0V2.1VLED-R14

Gnd0V0VGnd15

68

LCD DV August 2008 32LG40

Side Control Key P101 Connector Layout, Voltage and Diode Check

P101 "Side Control" to J2 "Front Board"

Diode CheckRun STBYLabelPin

OL3.4V3.4VKey 11

Gnd0V0VGnd2

OL3.41V3.41VKey 23

Gnd0V0VGnd4

OL3.41V3.41VKey 35

Gnd0V0VGnd6

OL3.41V3.41VKey 47

Gnd0V0VGnd8

With all Connectors Removed, Resistance taken in Diode Mode.

69

LCD DV August 2008 32LG40

INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)

This section shows the 11X17 foldout that

and Adobe version of the Training Manual.

The Adobe version of this Training Manual allows the viewer to

zoom in and out making reading of the small text easier.

This Power Point shows a graphical representation of the 11 X 17

foldout page so clarity is limited.

s available in the Paper

’’s available in the Paper

70

LCD DV August 2008 32LG40

Do not run without

heat sink attached

Ballast PWB

On then Off after ballast

fires

LD1

Ballast

Drive LED

Pin 1 Pin 6

22V p/p 34V p/p

1616

T1 T2

Secondary over 1.2Kv

To Backlight

Left Side

MCN1

24V

F1

8A / 150V

To Backlight

Right Side

P203 "SMPS" to MCN1 "Ballast PWB"

Pin Label STBY Run Diode Check

1 24V 0V 24.52V 0.33V 2 24V 0V 24.52V 0.33V 3 24V 0V 24.52V 0.33V 4 24V 0V 24.52V 0.33V 5 24V 0V 24.52V 0.33V 6 Gnd Gnd Gnd Gnd 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd

9 Gnd Gnd Gnd Gnd 10 Gnd Gnd Gnd Gnd 11 BR1 1.67V OL 12 INV On-Off 3.45V OL 13 PWM-DIM 3.40V OL 14 ERROR 0V OL

0V 0V 0V 0V

*PWM-DIM (PDIM) Pin 13 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

Not Used

CN403

CN402

CN401

DVD Drive

CN400

32LG40 INTERCONNECT DIAGRAM

TO TFT MODULE

CN2 CN3

T-CON Board

US2

3) 0.0V

2) 1.8V

12V

F1

6.3V/1.5A

Far left and right pins are not

counted, they are ground.

P203

P202

Not Used

5A / 250V

A/C Fuse

F100

L

A/C In

SC100

N

1) 3.3V

CN1

*PWM-DIM (PDIM) Pin 22 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

Power Supply

3.15A / 250V Rating 334V Actual Reading

F101

P201 Odd "SMPS" to P800 "Main PWB"

P201 Even "SMPS" to P800 "Main PWB"

Pin Label STBY Run Diode Check Pin Label STBY Run Diode Check

1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V 3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd 5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V 7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V 9 5.2V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V

11 5.2V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V

5.15V

5.15V 13 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd 15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 17 ERR 0V 0V 1.26V 18 ACD 5.05V 4.57V OL 19 PWR 0V 2.86V OL 20 INV-On/Off 0V 3.29V OL 21 BR1 0.1V 1.68V OL 22 PWM-DIM 0V 3.38V OL 23 N/C 0V 3.2V OL 24 N/C 0V 0V OL

P902 Pin 11

To Force Power Supply On. Disconnect P800 on Main PWB. Jump 5V to pin 19. Ballast and All voltages should turn on.

P201

Example Of LVDS Signal

Waveforms for P902

Pins 11 through 20

(All waveforms on back of

11X17 fold out)

Q901

Q900

IC809

P902

P200

Upgrades

Main (Digital) Board

Reset

BSM

IC400

X400

IC805

IC401

24 Mhz

1.5V

IC802 IC801

IC00 BCM

X200

54 Meg

Grayed Out ICs are

located on Back

IC807

1.5V

1.5V TUNER

P800

P901

P900

P904

P401

IC407

IC405

IC801

P500

IC808

Micro

Q400

LD800

IC806

To Speakers

Software

IC803

Side (Key) Controls

P101

Front PWB

Assembly (Interface)

J2 J1

IR Receiver

Power Button

IC201 IC405

PIN FUNCTION NAME STBY RUN PIN

2 IN +5V 0V 5V 1 IN 3.3V_MICON 3.41V 3.41V 1 On/Off Control Power_CTL_3.3V 0V 3.4V 1,3 IN ST_5V 0V 5V 3 On/Off Control B CM DDR Power 0V 3.4V 2 Gnd Gnd Gnd Gnd 2 IN +5V_SUB 0.36V 5V 2,4 On/Off Control Q802 0V 0.28V 7 OUT USB_PWR_Out_1 0V 5V 3 OUT Reset (Lo-Hi) 0.6V 0.6V 3 Gnd Gnd Gnd Gnd 5,6,7,8 OUT +5V_SUB 0V 5V 8 OUT +3.3V 0V 3.1V

IC304 PIN

PIN FUNCTION NAME STBY RUN 1Gnd +3.3V0V5VPIN FUNCTION NAME STBY RUN B On/Off Control RL_ON 0V 3.29V

3,8 OUT DDRO_VTT 0V 1.29V 2 OUT Gnd Gnd Gnd 1 IN +9V 0V 8.9V C Pull Down ST_5V 0V 5V

5,6,7 IN D2.6V_BCM 0V 2.6V 3 IN +5V_SUB 0V 3.2V 2 On/Off Control Power_CTL_3.3V 0V 3.4V E Gnd Gnd Gnd Gnd

4 On/Off Control DDRO_VTT 0V 1.29V

IC400 PIN FUNCTION NAME STBY RUN 4 n/c n/c n/c n/c PIN FUNCTION NAME STBY RUN

Reset Generator for IC401 3.3V BCM (On Back)

PIN FUNCTION NAME STBY RUN 1 IN +12V 0V 12V 5 Gnd Gnd Gnd Gnd B Reset Reset 0.6V 0.6V

1 IN D3.3V_BCM 0V 3.4V 2 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 3 OUT +9V 0V 9V PIN FUNCTION NAME STBY RUN E Gnd Gnd Gnd Gnd 3 OUT Reset (Lo-Hi) 0V 3.39V 6,7,8,10 IN +5V_SUB 0.36V 4.98V

USB Power

2.6V BCM

Reset Generator for Q400 Micro Reset

FUNCTION

+3.3V Regulator (3.3V TMDS_SW)

IC802

FUNCTION

IC803

+9V Regulator

D3.3V/A3.3V_BCM Regulator turns on LD800

NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN

NAME STBY RUN

IC806 Q801

4 OUT D3.3V_BCM 0.1V 3.4V

IC807

IC809

1,2,3,4,5 OUT D2.6V_BCM 0V 2.66V

14,15 n/c n/c n/c n/c

11,18,19,20 Gnd Gnd Gnd Gnd

D3.3V_BCM Regulator (Also A3.3V_BCM)

3OUT +5V0V5V

D2.6V_BCM Regulator (Also A2.6V_BCM)

17 On/Off Control Power_CTL_2.6V 0V 3.41V

Q802

Q400

5V Sub Switch Controller for Q801

PIN FUNCTION NAME STBY RUN

C Vcc 3.3VVST_MICON 0V 0V

5V Sub Switch

Reset Generator for MICRO IC407

IC401 IC808

PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN

14 IN D3.3V_BCM 0V 3.41V 2 IN ST_5V 5V

1 On/Off Control Reset from IC400 0V 3.4V 3 OUT 3.3VST_MICON 3.43V 6 OUT BCM_RESET 0V 3.4V 4 Gnd Gnd Gnd Gnd

IC801 Q900

PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN

1 Gnd Gnd Gnd Gnd B Control 2 OUT +1.8V_NTP 0V 1.8V C Pull Down 12V LVDS Switch Control 0V 0V 3IN

IC805 Q901

PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN

6,7,8,10 IN +5V_SUB 0.38V 5V 1,3 IN 12V 0V 12.36V

17 On/Off Control Power_CTL_1.2V 0V 3.41V 2,4 On/Off Control Q900 0V 6.16V

1,2,3,4,5 OUT D1. 2 V_BCM 0V 1.29V 5,6,7,8 OUT LVDS 12V 0V 12.36V

13, 14,15,16 n/c n/c 0V 0V

11,12,18,

19,20

Screen Print for Pin No is incorrect, use IC

BCM IC100 Reset

+1.8V_NTP Regulator

3.3V_TMDS_SW

D1.2V/A1.2V BCM Regulator

Gnd Gnd Gnd Gnd

0.26V 3.29V E Gnd Gnd 0V 0V

ST-BY 3.3V DC-DC Converter

Controller for LVDS 12V Switch Q901

LVDS_PANEL_CTRL

LVDS 12V Switch

REGULATORS/ICs ON BACKREGULATORS/ICs ON FRONT

5V

3.43V

0V 0.75V

32LG40 LVDS P902 WAVEFORMS

32LG40 LVDS CABLE WAVEFORMS:

Waveforms taken using SMTP Color Bar input. All readings give the Scale and Time Base related to scope settings. Top waveform in each image gives a slower rate. 10mV at 5uS per division. Bottom waveform shows a blow up sample. 10mV at 2uS per division.

32LG40

Direct View LCD

This concludes the 32LG40 training session.

LG 32LG40 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TRAINING MANUAL

OUTLINE

Overview of Topics to be Discussed

Preliminary Matters (The Fine Print)

ESD Notice

OVERVIEW SECTION

Basic Troubleshooting Steps

Basic Specifications

Pixel Count to Resolution Comparisons

Basic Specifications

Basic Specifications

Remote Control

Rear and Side Input Jacks

Accessing the Service Menu

Software Upgrade Procedure

32LG40 Product Measurements

TROUBLESHOOTING SECTION

Removing the Back Cover

Circuit Board Layout

Invisible Speaker System Layout

Power Supply P201 Control Signals from Main Board P800

Power Supply Board Test (1) All Board Disconnected

Power Supply Board Test (2) Checking the Backlights

Power Supply Board Removal

Power Supply Connector P201 Odd Pins Voltage and Diode Check

Power Supply Connector P203 Voltage and Diode Check

MAIN BOARD SECTION

Main Board (Front Side) Regulator Checks 1 of 2

Main Board (Front Side) Regulator Checks 2 of 2

Main Board (Back View) Regulator Layout

Main Board (Back Side) Regulator Checks

Main Board X400 and X200 Check

Main Board Tuner Video and SIF Output Check Pin Location

Main Board Tuner Video and SIF Output Check

Main Board LVDS P902 Output Check

Main Board Removal

Main Board Connector P800 Voltage and Diode Check

Main Board Connector P902 LVDS Layout and 12V Circuit

Main Board Connector P902 Even Pins Voltage and Diode Check

Main Board Connector P401 Voltage and Diode Check

Main Board Connector P904 Voltage and Diode Check

BALLAST SECTION (With Shield) LAYOUT

Ballast Board Assembly Layout

Ballast Transformer Waveforms

Ballast Control Signals from Main Board P800

Ballast Removal (Heat Sink and Insulators)

Ballast Connector MCN1 Voltage and Diode Check

DVD Player Removal (1 of 2)

DVD Player Removal (2 of 2)

DVD Player Removed

DVD Connector CN401 Voltage and Diode Check

DVD Connector CN400 and CN402 Voltage and Diode Check

Front Board Assembly Layout

Front Board Assembly Rear View Layout

Front Control Connectors J1 and J2 Voltage and Diode Check

Side Control Key P101 Connector Layout, Voltage and Diode Check

INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)