LG 50PJ350 Schematic

Training Manual

50PJ350 Plasma Display

Advanced Single Scan Troubleshooting

50" Class HD 720p Plasma TV

(50" diagonally)

Published July 12th, 2010

Updated August 12

, 2010

OUTLINE

Preliminary:

Contact Information, Preliminary Matters, Specifications, Plasma Overview, General Troubleshooting Steps, Disassembly Instructions, Voltage and Signal Distribution

Overview of Topics to be Discussed

Troubleshooting:

Circuit Board Operation, Troubleshooting and Alignment of :

• Switch Mode Power Supply

• Y-SUS Board Delivers Logic Signals and FG5V to lower Y-Drive board.

• Y-Drive Boards (1 Upper and 1 Lower).

Lower can run separately, but you MUST remove the Upper completely.

• Z-SUS Output Board (Also uses one Z-SUB board for bottom panel connector)

• Control Board

• X Drive Boards (3)

• Main Board

• Interconnect Diagram: 11X17 Foldout Section used as a quick reference sheet.

• No Main Power Switch (Vacation Switch).

No VS On command input to SMPS

July 2010 50PJ350 Plasma

Overview of Topics to be Discussed

50PJ350 Plasma Display

The first section will cover Contact Information and 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.

The next section will get the Technician familiar with the Disassembly, Identification and Layout of the Plasma 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.

July 2010 50PJ350 Plasma

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 us.lgservice.com

Knowledgebase Website lgtechassist.com

LG Web Training lge.webex.com

LG CS Academy lgcsacademy.com

LCD-DV:

PLASMA:

PDP Panel Alignment Handbook, Schematics with Bookmarks

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

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

Also available on the Plasma Page:

Plasma Control Board ROM Update (Jig required)

Published July 2010 by LG Technical Support and Training

LG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

New: Software Downloads

Technical Assistance

Presentations with Audio/Video

and Screen Marks

http://136.166.4.200

New Training Materials on

the Learning Academy site

July 2010 50PJ350 Plasma

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.

July 2010 50PJ350 Plasma

(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

July 2010 50PJ350 Plasma

Safety and Handling, Checking Points

Safety & Handling Regulations

1. Approximately 10 minute pre-run time is required before any adjustments are performed.

2. Refer to the Voltage Sticker inside the Panel when making adjustments on the Power Supply, Y-SUS and Z-SUS Boards.

3. Always adjust to the specified voltage level (+/- ½ volt) unless otherwise specified.

4. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, 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 used extensively for processing the Drive Signals and should be protected from static electricity.

5. The PDP Module must be carried by two people. Always carry vertical NOT horizontal.

6. The Plasma television should be transported vertically NOT horizontally.

7. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.

8. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.

9. New Panels and Frames are much thinner than previous models. Be Careful with flexing these panels. Be careful with lifting Panels from a horizontal position. Damage to the Frame mounts or panel can occur.

10. New Plasma models have much thinner cabinet assemblies and mounts. Be extremely careful when moving the set around as damage can occur.

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: Y-SUS or Y-Drive Board Failure, Mal-discharge on screen, etc.

July 2010 50PJ350 Plasma

Basic Troubleshooting Steps

Define, Localize, Isolate and Correct

• Define

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 LEDs may give some clues.

• Localize

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.

Look at the symptom carefully and determine what circuits could be causing the

After carefully checking the symptom and determining the circuits to be checked

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

• 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.

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

July 2010 50PJ350 Plasma

50PJ350 PRODUCT INFORMATION SECTION

This section of the manual will discuss the specifications of the 50PJ350 Advanced Single Scan Plasma Display Television.

July 2010 50PJ350 Plasma

50PJ350 Specifications

50" Class (50" diagonal)

• 600Hz Sub Field Driving

• High Definition Resolution

1080P PLASMA HDTV

• 3M:1 Dynamic Contrast Ratio

• TruSlim Frame

• Picture Wizard II (Easy Picture Calibration)

• Smart Energy Saving

• Intelligent Sensor

• Dual XD™ Engine

• AV Mode(Cinema, Sports, Game)

• Clear Voice II

• ISFccc® Ready

• 24P Real Cinema

• USB 2.0 (JPEG, MP3)

• 3 HDMI™ 1.3 Inputs

• SIMPLINK™ Connectivity

For Full Specifications

See the Specification Sheet

• Dolby® Digital 5.1 Decoder

• Infinite Sound

July 2010 50PJ350 Plasma

50PJ350 Logo Familiarization Page 1 of 3

600Hz Sub Field Firing:

Capture every moment. Tired of streaky action or unclear plays during the game? See sports, fast action and video games like never before. The 600Hz refresh rate virtually eliminates motion blur.

3.000,000 : 1 Contrast Ratio

Stunning detail. No more worrying about dark scenes or dull colors. The Mega Contrast ratio of 3,000,000:1 delivers more stunning colors and deeper blacks than you can imagine.

TruSlim Design:

At less than 1" thick the new TruSlim Frame trims away distraction without compromising screen size.

USB 2.0:

View videos and photos and listen to music on your TV through USB 2.0.

July 2010 50PJ350 Plasma

50PJ350 Logo Familiarization Page 2 of 3

HD RESOLUTION 720P HD Resolution Pixels: 1365 (H) × 768 (V) See and experience more. Pictures are sharper. Colors are more vibrant. Entertainment is more real. Everything looks better on an HDTV.

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.

Invisible Speaker Personally tuned by Mr. Mark Levinson for LG

TAKE IT TO THE EDGE newly introduces ‘Invisible Speaker’ system, guaranteeing first class audio quality personally tuned by Mr. Mark Levinson, world renowned as an audio authority. It provides Full Sweet Spot and realistic sound equal to that of theaters with its Invisible Speaker.

Dual XD Engine Realizing optimal quality for all images

One XD Engine optimizes the images from RF signals as another XD Engine optimizes them from External inputs. Dual XD Engine presents images with optimal quality two times higher than those of previous models.

July 2010 50PJ350 Plasma

50PJ350 Logo Familiarization Page 3 of 3

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

AV Mode is three preset picture and audio settings. It allows the viewer to quickly switch between common settings. It includes Cinema, Sports, and Game Modes.

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

It reduces the plasma display’s power consumption. The default factory setting complies with the Energy Star requirements and is adjusted to the comfortable level to be viewed at home. (Turns on Intelligent Sensor).

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.

July 2010 50PJ350 Plasma

600Hz Sub Field Driving

(600 Hz Sub Field Driving)

• 600 Hz Sub Field Driving is achieved by using 10 sub-fields per frame process

(vs. Comp. 8 sub-field/frame)

• No smeared images during fast motion scenes

Original Image 10 Sub Fields Per Frame

Sub Field firing occurs using wall charge and polarity differences between Y-SUS and Z-SUS signals.

July 2010 50PJ350 Plasma

50PJ350 Remote Control

p/n AKB72914201

TOP PORTION

BOTTOM PORTION

July 2010 50PJ350 Plasma

50PJ350 Rear and Side Input Jacks

REAR

INPUTS

AC In

USB for Music, Photos

and Software

Upgrades

SIDE

INPUTS

USB

HDMI 3

Composite

Video/Audio

July 2010 50PJ350 Plasma

50PJ350 Dimensions

Power:

340W (Typical)

0.1W (Stand-By)

30-13/16"

782.32mm

28-3/8"

721.36mm

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

15-3/16”

385.8mm

Model No.

Serial No.

Label

46-1/8"

1170.94mm

15-3/4"

400mm

Remove 4 screws

to remove stand

for wall mount

2-3/16"

55.88mm

5-1/4”

133.6mm

15-3/4"

400mm

7-3/8”

187.2mm

2-3/8"

60.96mm

Weight:

78.5 lbs with Stand

60.8 lbs without Stand

2-3/4"

70mm

20-7/8"

530mm

12-3/16"

309.88mm

17 July 2010 50PJ350 Plasma

DISASSEMBLY SECTION

This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 50PJ350 Advanced Single Scan Plasma Display Panel.

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.

July 2010 50PJ350 Plasma

Removing the Back Cover

To remove the back cover, remove the 32 screws

(The Stand does not need to be removed).

PAY CLOSE ATTENTION TO THE TYPE, SIZE AND LENGTH

Of the screws when replacing the back cover.

Improper type can damage the front.

Indicated by the arrows.

July 2010 50PJ350 Plasma

Circuit Board Layout

Identifying the Circuit Boards

FPC

FPC FPC

FPC

FPC FPC

Y-Drive Upper

Y-SUS

Y-Drive Lower

TCP

Heat Sink

Left “X”

Panel Voltage and Panel ID Label

Power Supply

(SMPS)

Control

Center “X”

AC In

Z-SUS

Z-SUB

Main Board

Right “X”

FPC

Side

Input

(part of

main)

IR/LED

Board

Soft Touch

Keyboard

Conductive Tape

Invisible Speakers

Conductive Tape

July 2010 50PJ350 Plasma

50PJ350 Connector Identification Diagram

PANEL

p/n: EAJ60716304 (PDP50T10000.ADLGB)

P101P102P103

Y-DRIVE

p/n: EAJ60716316 (PDP50T10000.ASLGB)

UPPER

p/n: EBR63551601

Board

P211

P812

Z-SUS

Board

P101

P201P202P203

P100

P110

P204

p/n: EBR63551701

P101

p/n: EBR63039801

P212P205

Y-DRIVE

LOWER

Board

P122

LEFT X

Y-SUS

Board

P203

Board

P210

P101

p/n: EBR64062301

P111

p/n: EBR63549501

P121 P212

p/n: EBR64062201

SMPS

POWER SUPPLY

Board

p/n: EAY60968701

P102

n/c

P121

CONTROL

Board

P161

P231

P101

P162

P210

CENTER X

Top row Odd Back row Even

SC101

P813

P211

P331

LVDS

p/n: EBR63040301

Z-SUB Board

P301

P704

P801

p/n: EBT60953802

RIGHT X

Board

P102

P202

P703

P900

n/c

MAIN

Board

p/n: EBR64062001

FRONT IR

p/n: EBR65007704

Speakers (Front Right)

Front “Soft Switch” Key Pad

p/n: EAB60962801p/n: EAB60962801

Speakers (Front Left)

July 2010 50P

J350 Plasma

Disassembly Procedure for Circuit Board Removal

Note: 1) Remember to be cautious of ESD as some semiconductors are CMOS and prone to static failure.

Switch Mode Power Supply Board Removal

Disconnect the following connectors: P812, P813 and SC101. Remove the 9 screws holding the SMPS in place. Remove the board. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Also, re-confirm VSC, -Vy and Z-Bias as well.

Note: The Y-SUS does not come with the

Y-SUS Board Removal

Disconnect the following connectors: P210, P211, P212 and Ribbon Cable P110. To remove P110, lift up on the locking mechanism and pull the ribbon cable out. Remove the 16 screws holding the Y-SUS in place. Do not run the set with P117 or P118 removed. Remove the Y-SUS board. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Confirm VSC, -Vy and Z-bias as well.

Y-Drive Boards Removal

Note: The Y-SUS does not come with the

connectors between the Y-SUS and Y-Drive

connector to the Lower Y-Drive

Board Standoff

Disconnect the following Flexible Ribbon Connectors P101~P103 and/or P201~P203: Disconnect P212 by pulling the ribbon cable upward. Remove P204 or P110 by lifting up on the locking mechanism and pull the ribbon cable out. Do not run the set with these connectors removed. Remove the 3 screws holding either of the Y-Drive boards in place. Lift up slightly, the slide to the left. Remove the Y-Drive Board.

Note: Y-SUS, Z-SUS and Y-Drive boards are mounted on board stand-offs that have a small collar. The board must be lifted slightly to clear these collars. Behind each board are “Chocolate” (dense rubber like material) that act as shock absorbers. They may make the board stick when removing.

July 2010 50PJ350 Plasma

Collar

Disassembly Procedure for Circuit Board Removal (2)

Z-SUS Board Removal

Disconnect the following connectors: P1 and P2, then P101, P102 and P202 by pulling out the locking mechanism and pulling out the FPC to the panel. Remove the 11 screws holding the board in place. Remove the two screws in the Z-SUB board. Lift up slightly to clear the screw stand-offs and pull the Z-SUS to the left. Unseat P3/P7 from the Z-SUB board and remove the board. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Confirm VS, -Vy and Z-bias as well.

Z-SUB Board Removal

Remove the two screws in the Z-SUB board. Remove P202 by pulling out the locking mechanism and pulling out the FPC to the panel. Remove the board.

Main Board Removal

Disconnect the following connectors: P703 LVDS and P301 (press gently inward on the locking tabs) and pull out, P704 and P801. Remove 1 screw in the decorative plastic piece and remove. Remove the 4 screws holding the Main board in place and Remove the board.

Control Board Removal

Disconnect the following connectors: P12 LVDS, P111 Ribbon and P101, P102, P104 Ribbons by lifting up the locking tab. Remove the 2 screws holding the Control board in place. Lift up the Control board to unseat it from the two metal supports at the bottom and Remove the board.

Front IR and Key Pad Removal

FRONT IR/INTELLIGENT SENSOR and POWER BUTTON:

Disconnect P100 and P101. Note: P101 is a ribbon connector. Lift up the locking mechanism and slide the ribbon cable out. Remove the Board by lifting up on the top tabs, lift the board and remove.

KEY PAD:

The Key Pad is a thin strip of static sensitive material attached to the front glass. It is not removable.

July 2010 50PJ350 Plasma

X Drive Circuit Board Removal Continued

Make sure AC is removed. Lay the Television down carefully on a padded surface. Make sure to use at least two people for this process so as not to flex the panel glass.

a) Remove the Back Cover. b) Remove the Stand (4 Stand Screws were removed during back removal). c) Remove the Stand Metal Support Bracket (5 Screws) 2 Plastic tap thread and 3 Metal thread. d) Remove the two Vertical support Braces marked “E”.

Note: There are (Note, the right brace has a Grounding wire from the AC input which must also be removed).

e) Remove the 10 screws holding the Heat Sink. (Warning: Never run the set with this heat sink

removed). To remove the heat sink, lift up to release the tacky Chocolate (heat transfer material) and slide the heat sink to the left to clear the connector wires on the right side. Note: There are two large pieces of conductive tape on the right side of the Right X Board that must be removed. Also, note that there several pieces of Chocolate heat transfer material attached all the way across the underside of the heat sink.

5 Screws per/brace, 2 Plastic tap thread and 3 Metal thread.

X-DRIVE LEFT, CENTER AND RIGHT REMOVAL:

Disconnect all TCP ribbon cables from the defective X-Drive board and all other Ribbon cables going to the board.

Remove the (3 Left or Right X) or (5 Center X) screws holding the defective X-Drive board in place.

Remove the board. Reassemble in reverse order. Recheck Va / Vs / VScan / -VY / Z-Drive.

July 2010 50PJ350 Plasma

Getting to the X Circuit Boards

With Stand removed

Left

Warning:

Never run the TV with the

TCP Heat Sink removed

Heat Sink

Right

Ground

Wire

Warning Shorting Hazard: Conductive Tape. Do not allow to touch energized circuits.

July 2010 50PJ350 Plasma

Left and Right X Drive Connector Removal

Disconnect connector P122

See below to Remove the Connections on the X-Boards.

From the Control Board to the X-Boards. There may be tape on these connectors.

P231, P232 P121, P212 P211, P331

Are the same

Remove tape (if present) and Gently

locking mechanism upward and remove the ribbon

cable from the connector.

Removing Connectors to the TCPs.

pry the

Va from the

Y-SUS to

Left X Only

Connectors from Center to Left and

Center to Right X Boards

P121 to P212

Left to Center X

P211 to P331

Center to Right X

Carefully lift the TCP ribbon up and off.

It may stick, be careful not to crack TCP.

(See next page for precautions)

Gently lift the locking mechanism

upward on all TCP connectors

Left X: P101~108

Center X: P201~207

Right X: P301~308

Cushion (Chocolate)

TCP

Example

Flexible ribbon cable connector

July 2010 50PJ350 Plasma

TCP (Tape

Carrier

Package) Generic Removal Precautions

Lift up the lock as shown using your fingernail.

(The Lock can be easily broken.

It needs to be handled carefully.)

Separate the TCP from the connector as shown.

TCP Film can be easily damaged.

Handle with care.

The TCP has two small tabs on each side which lock the ribbon cable fully into the connector. They have to be lifted up slightly to pull the connector out. Note: TCP is usually stuck down to the Chocolate heat transfer material, be Very Careful when lifting up on the TCP ribbon cable.

Tab

July 2010 50PJ350 Plasma

Left, Center and Right X Drive Removal

Remove the 3 screws in Left or Right X-Boards or 5 in the Center X-Board. (9 Total)

(Some screws are shared between boards)

The Left X Board drives the Right 5/16 of the side of the screen vertical electrodes The Center X Board drives the Center 3/8 of the of the screen vertical electrodes The Right X Board drives the Left 5/16 of the side of the screen vertical electrodes

July 2010 50PJ350 Plasma

CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION

50PJ350 Plasma Display

This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply, Y-SUS Board, Y-Drive Boards, Z-SUS Board, Control Board, Main Board and the X Drive Boards.

At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls. The technician should be able with confidence to troubleshoot a circuit board failure, replace the defective circuit and perform all necessary adjustments.

July 2010 50PJ350 Plasma

50PJ350 Signal and Voltage Distribution Block

Y Drive

Upper

FPCs

P101

P102

5VFG (5V) measured

from Floating Ground

15VFG (15V) measured

from Floating Ground

Y-SUS Board

P103

FPCs

P201

P202

P203

P110

P204

P205

Y Drive

Scan

P110 / P204 Floating Gnd (FG) Drive Signals, FG5V and Vscan.

FG5V

Scan

FG15V

16V

VSC

-VY

P212

Floating Gnd (FG) Drive Signals, FG5V

Lower

Display Panel Horizontal Electrodes Reset, Sustain

P211

P210

P101

P114

P122

SMPS TURN ON SEQUENCE

Step 1: RL_ON: 17V, 5V, AC_Det, Error Det, Step 2: M_On: M5V, Va, Vs

P812

M5V, Vs, Va

Note:

Va not used

by Y-SUS only

fused and routed

to the X-Board

Logic Signals

SMPS Board

SK101

AC Input Filter

LVDS

Display Enable

Video

To Y-SUS and Y-Drive

P121

Board

P161

P162

16V / M5V

Note: 16V not used

by Control

P111

CONTROL

RGB Logic

Signals

3.3V

P121 P212

P231

P232

P211 P311 P331

X-Board-Center

P813

P101

3.3V

RGB Logic

Signals

3.3V

SMPS OUTPUT VOLTAGES IN STBY

STB +5V

SMPS OUTPUT VOLTAGES IN RUN

STB5V, +5V, 17V to Main Board Vs, Va and M5V to Y-SUS,

Error Com

SMPS

Turn On

Commands

RL_ON

M_On

17V, +5V, AC Det

M5V, Va, Vs

16V / M5V

Stand By:

STB +5

Run:

AC Det +5, 17V

P301

P703

MAIN Board

P704

3.3V

STBY

3.3V

P211 P331

P801

Intelligent Sensor

P100

X-Board-RightX-Board-Left

IR,

Display Panel

Horizontal

Electrodes

Sustain

Z-SUS

Board

Z Drive Control

Signals

Z-SUB

Board

Speakers

Soft Touch Keys

And Power Button

P101

FPCs

P101

P102

P202

FPCs

3.3V

Key Board

Pull Up

P101 P102 P103 P104 P201 P203 P204 P206 P301 P302 P303 P305

P105 P202 P205 P304

Display Panel Vertical Address (Colored Cell Address)

July 2010 50PJ350 Plasma

+ 103 hidden pages

LG 50PJ350 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual

OUTLINE

Overview of Topics to be Discussed

Preliminary Matters (The Fine Print)

ESD Notice

Safety and Handling, Checking Points

Basic Troubleshooting Steps

50PJ350 PRODUCT INFORMATION SECTION

50PJ350 Specifications

50PJ350 Logo Familiarization Page 1 of 3

50PJ350 Logo Familiarization Page 2 of 3

50PJ350 Logo Familiarization Page 3 of 3

600Hz Sub Field Driving

50PJ350 Remote Control

50PJ350 Rear and Side Input Jacks

50PJ350 Dimensions

DISASSEMBLY SECTION

Removing the Back Cover

Circuit Board Layout

Disassembly Procedure for Circuit Board Removal

Disassembly Procedure for Circuit Board Removal (2)

X Drive Circuit Board Removal Continued

Getting to the X Circuit Boards

Left and Right X Drive Connector Removal

CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTION