LG 50PJ340 Guide d'installation

Advanced Single Scan Troubleshooting

50" Class HD 720p Plasma TV

(50" diagonally)

Training Manual

50PJ350 Plasma Display

Published July 12

, 2010

Updated August 12

, 2010

2July 2010 50PJ350 Plasma

Overview of Topics to be Discussed

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

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

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

• Control Board

• X Drive Boards (3)

Troubleshooting:

Circuit Board Operation, Troubleshooting and Alignment of :

• Switch Mode Power Supply No VS On command input to SMPS

• Main Board

Preliminary:

Contact Information, Preliminary Matters, Specifications,

Plasma Overview, General Troubleshooting Steps,

Disassembly Instructions, Voltage and Signal Distribution

OUTLINE

• No Main Power Switch (Vacation Switch).

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

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

3July 2010 50PJ350 Plasma

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.

Overview of Topics to be Discussed

4July 2010 50PJ350 Plasma

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

Published July 2010 by LG Technical Support and Training

LG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

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

LCD-DV:

PLASMA:

Also available on the Plasma Page:

PDP Panel Alignment Handbook, Schematics with Bookmarks

Plasma Control Board ROM Update (Jig required)

LG Contact Information

Presentations with Audio/Video

and Screen Marks

New Training Materials on

the Learning Academy site

http://136.166.4.200

New: Software Downloads

Technical Assistance

5July 2010 50PJ350 Plasma

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.

Preliminary Matters (The Fine Print)

6July 2010 50PJ350 Plasma

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 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.

ESD Notice

ESD Notice (Electrostatic Static Discharge)

(Electrostatic Static Discharge)

7July 2010 50PJ350 Plasma

Safety & Handling Regulations

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.

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

Safety and Handling, Checking Points

8July 2010 50PJ350 Plasma

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 LEDs 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.

9July 2010 50PJ350 Plasma

This section of the manual will discuss the specifications of the

50PJ350 Advanced Single Scan Plasma Display Television.

50PJ350 PRODUCT INFORMATION SECTION

10 July 2010 50PJ350 Plasma

50PJ350 Specifications

1080P PLASMA HDTV

50" Class (50" diagonal)

•600Hz Sub Field Driving

•High Definition Resolution

•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

•Dolby® Digital 5.1 Decoder

•Infinite Sound

For Full Specifications

See the Specification Sheet

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