LG 50pq30 Diagram

Training Manual

50PQ30 Plasma Display

Advanced Single Scan Troubleshooting

720p

Published November 05

, 2009

OUTLINE

Section 1

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

Section 2

Circuit Board Operation, Troubleshooting and Alignment of :

• Switch mode Power Supply

Overview of Topics to be Discussed

• Y-SUS Board

Delivers Logic Signals and FG5V to both upper and lower boards.

• Y-Drive Boards (2) Upper and Lower. Lower board delivers Scan to Upper

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

• Control Board

• X Drive Boards (3)

• Main Board

• Main Power Switch (Version 3). Shuts off stand by 5V.

November 2009 50PQ30 Plasma

Overview of Topics to be Discussed

50PQ30 Plasma 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 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.

November 2009 50PQ30 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.

November 2009 50PQ30 Plasma

LG CONTACT INFORMATION

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

LCD-DV:

PLASMA:

Also available on

the Plasma page

Published November 2009 by LG Technical Support and Training

http://136.166.4.200

LG Learning Academy

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

Plasma Panel

Alignment Handbook

LG Electronics Alabama, Inc.

201 James Record Road, Huntsville, AL, 35813.

New Training Materials on

the Learning Academy site

Page 5

(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

November 2009 50PQ30 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 Board Failure, Mal-discharge on screen, etc.

November 2009 50PQ30 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 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 Oscilloscope

• 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

November 2009 50PQ30 Plasma

50PQ30 PRODUCT INFORMATION SECTION

This section of the manual will discuss the specifications of the 50PQ30 Advanced Single Scan Plasma Display Television.

November 2009 50PQ30 Plasma

50PQ30 Specifications

• 720p HD Resolution

• 600 Hz sub field driving

• 1,500 cd/m2 Brightness

• Dual XD Engine™

• 2000,000:1 Dynamic Contrast Ratio

• Smart Energy Saving

• 3x HDMI™ V.1.3 with Deep Color (2 Rear, 1 side).

720P PLASMA HDTV

50” Class (50” diagonal)

• AV Mode (Cinema, Sports, Game)

• Clear Voice

• LG SimpLink™ Connectivity

• Invisible Speaker System

• 100,000 Hours to Half Brightness (Typical)

• PC Input

November 2009 50PQ30 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.

November 2009 50PQ30 Plasma

Specifications Logo Familiarization (Picture Wizard)

Picture Wizard

consumers through the calibration process using on-screen reference points.

Customers can customize

picture performance without the need for additional expense.

easily guides

November 2009 50PQ30 Plasma

50PQ30 Logo Familiarization Page 1 of 2

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.

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.

November 2009 50PQ30 Plasma

50PQ30 Logo Familiarization Page 2 of 2

AV Mode "One click" Cinema,

TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 4 different modes of Cinema, Sports and Game 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

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).

THX

Cinema, Sport, Game mode.

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.

November 2009 50PQ30 Plasma

50PQ30 Remote Control

TOP PORTION

BOTTOM PORTION

November 2009 50PQ30 Plasma

50PQ30 Rear and Side Input Jacks

AC In

REAR

INPUTS

Software

Upgrades

SIDE

INPUTS

Music and

Photos

USB

HDMI 3

November 2009 50PQ30 Plasma

Power:

279W (Typical)

0.13W (Stand-By)

50PQ30 Dimensions

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

47-7/8"

1216.66mm

6-3/16"

157mm

15-3/4"

15-5/16"

405mm

400mm

3-5/16"

83.82mm

32-3/16"

817.9mm

759.46mm

Weight:

29-7/8"

2-5/16"

58.74mm

74.3 lbs with Stand

68.8 lbs without Stand

15-3/4"

400mm

7-7/8"

200mm

Remove 4 screws to

remove stand for

wall mount

25-5/8"

651mm

15-3/4"

400mm

Model No.

Serial No.

Label

4-15/16"

125mm

7-1/4"

183.74mm

13-7/8"

353mm

17 Published November 2009 50PQ30 Plasma

DISASSEMBLY SECTION

This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 50PQ30 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.

November 2009 50PQ30 Plasma

Removing the Back Cover

To remove the back cover, remove the 26 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.

November 2009 50PQ30 Plasma

Circuit Board Layout

Panel Voltage Label

Y-Drive

Upper

FPC

FPC FPC FPC

Identify the Circuit Boards

Power Supply

(SMPS)

Panel ID Label

FPC

Z-SUS

FPC

IR/

LED

Y-Drive

Lower

Power

Main

Y-SUS

TCP

Heat Sink

Keyboard

Left “X”

Control

AC In

Center “X”

Invisible Speakers

Right “X”

Conductive Tape Under Main Board

Z-SUB

Side Input

(part of main)

Main Board

FPC

November 2009 50PQ30 Plasma

Disassembly Procedure for Circuit Board Removal

Notes: 1) All Plugs listed are from left to right Pin 1,2, 3, ETC.

2) 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: P811, P813, SC101. Remove the 8 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.

After replacing the Y-Drive,

Y-SUS Board Removal

Disconnect the following connectors: P201, P206, P101, P202. Remove the 8 screws holding the Y-SUS in place. Remove the Y-SUS by lifting slightly to clear standoff and slid it to the right. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Confirm VSC, -Vy and Z-bias as well.

After replacing the Y-Drive,

Y-Drive Boards Removal

check the connectors for solder breaks.

check the connectors for solder break.

Board Standoff

Disconnect the following Flexible Ribbon Connectors: P101~P103 and/or P201~P203. Disconnect the following connectors: P209 and/or P108. Remove the 3 screws holding either of the Y-Drive boards in place. Remove the Y-Drive by lifting slightly and sliding the board to the left unseating P106, P107, P109 and/or P205, P206 and P208 from the Y-SUS Board.

Note: Y, 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.

November 2009 50PQ30 Plasma

Collar

Disassembly Procedure for Circuit Board Removal (2)

Z-SUS Board Removal

Disconnect the following connectors: P100, P101. Disconnect the following connectors: P104, P105 and P302. These are the FPC cables. Pull the locking caps to the right. Lift carefully the Flexible Printed Circuits (FPCs) and slide them out to the right. Remove the 5 screws holding the Z-SUS in place and the one holding the Z-SUB in place. Lift the Z-SUS up and remove the board. Remove the Z-SUB by pulling it off the Z-SUS. When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label. Confirm VS, -Vy and Z-bias as well.

Main Board Removal

Disconnect the following connectors: P1001, P1003, P1005 and P1006. Remove the 1screws holding on the decorative plastic piece on the right side. Remove the 4 screws holding the Main board in place and Remove the board.

Control Board Removal

Disconnect the following connectors: P121 LVDS, P101, P161 Ribbon, P162 Ribbon by lifting up the locking tab. Remove the 4 screws holding the Control board in place Remove the board.

Front Key and LED Board Removal

Remove the 2 screws holding the Key board in place. Remove the board by releasing the two black tabs and lifting the board upward. Disconnect P101. (Note: LED board is behind the Key board. Remove it’s 2 screws and remove. Disconnect J1 and J2.

November 2009 50PQ30 Plasma

X Drive Circuit Board Removal Continued

Lay the Plasma down carefully on a padded surface. Make sure AC is removed and remove the Back Cover and the Stand. Carefully remove the LVDS Cable P121 from the Control Board by pressing the Locking Tabs together and pull the connector straight back to remove the cable. (This prevents possible damage). See illustration below.

Press

Inward

LVDS Cable Connector

(A) Remove the Stand (4 Screws removed during back removal). (B) Remove the Stand Metal Support Bracket (5 Screws). (C) Remove connector P1001 to Front IR board and P1005 to the Speakers. (D) Remove the 4 screws from the Main Board Mounting Bracket. Carefully reposition the Main Board and Mounting

Bracket up and off to the right side. (E) Remove the metal support Braces marked “E”. Note: There is a Left and a Right brace. (3 Screws per/bracket). (F) Remove the 9 screws holding the Heat Sink. (Warning: Never run the set with this heat sink removed).

X-DRIVE LEFT, CENTER AND RIGHT REMOVAL:

Disconnect all TCP ribbon cables from the defective X-Drive board. Remove the 3 screws in either the Left or Right X-Drive board or the 4 screws holding the Center X-Drive in place. Remove the board. Reassemble in reverse order. Recheck Va / Vs / VScan / -VY / Z-Drive.

Press

Inward

November 2009 50PQ30 Plasma

Getting to the X Circuit Boards

Warning: Never run the TV with the TCP Heat Sink removed

LVDS Cable

Stand should have already be removed

Heat Sink

Left

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

November 2009 50PQ30 Plasma

Right

Left and Right X Drive Removal

After removing the back cover, the Main board is lifted out of the way, the 9 screws removed from heat sink covering the TCPs and connectors to the TCPs are removed, the X-Drive boards can be removed.

There may be tape on the connectors P231 or P232

P231 P232

Peel the tape off the connectors

Remove tape (if present) and Gently

locking mechanism upward and remove the ribbon

cable from the connector.

Removing Connectors to the TCPs.

Gently lift the locking mechanism

upward on all TCP connectors

Left X: P101~105

Center X: P201~206

Right X: P301~305

Cushion (Chocolate)

pry the

Disconnect connector P122

P122

Va from the Y-SUS

Carefully lift the TCP ribbon up and off.

It may stick, be careful not to crack TCP.

(See next page for precautions)

TCP

Flexible ribbon cable connector

November 2009 50PQ30 Plasma

TCP (Tape

Carrier

Package) Generic Removal Precautions

TCP Connector Removal

Lift up the lock as shown by arrows.

(The Lock can be easily broken.

It needs to be handled carefully.)

The TCP has two small tab on each side which have to be lifted up slightly to pull the connector out. Note: TCP is usually stuck down to the heat transfer material, be Very careful when lifting up on the TCP ribbon cable.

Pull TCP apart as shown by arrow.

(TCP Film can be easily damaged.

Handle with care.)

November 2009 50PQ30 Plasma

Left and Right X Drive Removal

Remove the 3 screws for either left or right board or 4 for the center. 8 total for all three.

(The screws between the boards, secures both boards)

The Left X Board drives the right side of the screen vertical electrodes

The Center X Board drives the Center of the screen vertical electrodes

The Right X Board drives the left side of the screen vertical electrodes

November 2009 50PQ30 Plasma

CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT

ALIGNMENT SECTION

50PQ30 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.

November 2009 50PQ30 Plasma

50PQ30 SIGNAL and VOLTAGE DISTRIBUTION DIAGRAM

Y Drive

FPCs

P101

P102

P103

FPCs

P201

P202

P203

Upper

P109

P101

P103

P106

P107

P106

(V Scan)

P209

P208

P206

P207

5VFG indicates measured from

Floating Ground

5VFG

Drive Data Clock (i2c)

5VFG

Drive Data Clock (i2c)

Y Drive

Lower

Display Panel Horizontal Electrodes

P209 (5VFG) (FG)

P204 (FG)

P203 (FG)

Y-SUS

Board

P208 (FG)

P207 (V Scan) (5VFG) (FG)

VSC

DC/DC

-Vy

DC/DC

5VFG

DC/DC

P206

P201

P101

17V

DC/DC

P202

P122

SMPS OUTPUT VOLTAGES IN STBY

STB +5V (also AC Voltage Det)

P811

Power

M5V, Vs, Va

Note:

Va not used

by Y-SUS

Drive Signals for

Y-SUS and Y-Drive

M5V, 17V

Note: 17V not used

by Control

Signals

3.3V

P121

P212

Supply

Board

SK101

AC Input Filter

M5V

P200

P111

3.3V

P121

P101

CONTROL

Board

P161

P162

RGB

Logic

P231

P232

P211 P311 P331

X-Board-Center

P813

Z Drive Signals

3.3V

RGB

Logic

Signals

3.3V

P232

SMPS OUTPUT VOLTAGES IN RUN

STB5V, +5V, 17V, 12V to Main PWB Vs, Va and M5V to Y-SUS

SMPS

M5V, Vs, Error-Com

Turn On

Commands

Relay On M5 On VS On

+5V, 12V M5V Audio 17V, Va, Vs

LVDS

Z Drive

17V

Set in

Signals

LVDS

Stand By: STB +5

AC Voltage Det

STBY

P1006

P1001

P1005

P1003

MAIN Board

IR, Power LED,

3.3V

P211 P331

Intelligent Sensor

X-Board-RightX-Board-Left

Horizontal

Display Panel

Electrodes

P101

Z SUS Board

17V

P100

Speakers

Control Keys

3.3V

Power Button

FPCs

P101

P102

P103

P302

P301

FPCs

3.3V

Key Board

Pull Up

P101 P102 P103 P104 P105 P201 P301 P302 P304 P305

P202 P203 P204 P205 P206 P303

Display Panel Vertical Address (RGB Cell Address)

29 Published November 2009 50PQ30 Plasma

Panel Label Explanation

(1)

(2)

(3) (4)

(5) (6) (7)

(9) (10)

(8)

(11) (12)

(13) (14) (15)

(1) Panel Model Name (2) Bar Code (3) Manufacture No. (4) Adjusting Voltage DC, Va, Vs (5) Adjusting Voltage (Set Up / -Vy / Vsc / Ve / Vzb) (6) Trade name of LG Electronics (7) Manufactured date (Year & Month) (8) Warning

(9) TUV Approval Mark (10) UL Approval Mark (11) UL Approval No. (12) Panel Model Name (13) Max. Watt (Full White) (14) Max. Volts (15) Max. Amps

November 2009 50PQ30 Plasma

+ 109 hidden pages

LG 50pq30 Diagram

Specifications and Main Features

Frequently Asked Questions

User Manual

OUTLINE

Overview of Topics to be Discussed

Preliminary Matters (The Fine Print)

LG CONTACT INFORMATION

ESD Notice

Safety and Handling, Checking Points

Basic Troubleshooting Steps

50PQ30 PRODUCT INFORMATION SECTION

50PQ30 Specifications

600Hz Sub Field Driving

Specifications Logo Familiarization (Picture Wizard)

50PQ30 Logo Familiarization Page 1 of 2

50PQ30 Logo Familiarization Page 2 of 2

50PQ30 Remote Control

50PQ30 Rear and Side Input Jacks

50PQ30 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 Removal

Left and Right X Drive Removal

Panel Label Explanation