LG 50PG20D, 50PG20D-AA, 42PG60UD, 42PG60UD-AA Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : PA81A

MODEL : 50PG20D 50PG20D-AA

website:http://biz.LGservice.com

Internal Use Only

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Only for training and service purposes

CONTENTS

CONTENTS .............................................................................................. 2

SAFETY PRECAUTIONS ..........................................................................3

SPECIFICATION ........................................................................................4

ADJUSTMENT INSTRUCTION .................................................................6

TROUBLE SHOOTING ............................................................................11

BLOCK DIAGRAM...................................................................................17

EXPLODED VIEW .................................................................................. 24

SVC. SHEET ...............................................................................................

PRINTED CIRCUIT DIAGRAM ....................................................................

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Only for training and service purposes

SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.

It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this monitor is blown, replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

Do not use a line Isolation Transformer during this check.

Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to

0.5mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

1.5 Kohm/10W

To Instrument's exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

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Only for training and service purposes

SPECIFICATIONS

NOTE : Specifications and others are subject to change without notice for improvement

V Application Range

This spec is applied to the 50” PLASMA TV used PA81A Chassis.

V Specification

Each part is tested as below without special appointment.

1) Temperature : 25±5°C (77±9°F), CST : 40±5

2) Relative Humidity: 65±10%

3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz) * Standard Voltage of each product is marked by models.

4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.

5) The receiver must be operated for about 20 minutes prior to the adjustment.

V Test Method

1) Performance : LGE TV test method followed.

2) Demanded other specification

Safety : CB specification EMC : CISPR 13 specification

V General Specification ( 50” WXGA )

Display Screen Device

Aspect Ratio

PDP Module

Operating Environment

Storage Environment

Input Voltage

No Item Specification Remark

50” Wide Color Display Module

16:9

PDP50G1,

RGB Closed(Well) Type, Glass Filter(38%)

Pixel Format : 1365horiz. By 768 ver.

1)Temp. : 0~40deg

2)Humidity : 20~80%

3)Temp. : -20~60deg

4)Humidity : 10~90%

100-240V~, 50/60Hz

Plasma Display Panel

LGE SPEC.

Maker : LG

Chassis

PA81A 50PG60UD-AA Australia LG

Model Name Market Brand Remark

50PG60UD-AA Safety : IEC/EN60065

EMI : CISPR 13 Class B

Australia

Model ApplianceMarket Remark

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Only for training and service purposes

V Module Specification2

Market

Broadcasting system

Receiving system

Video Input (2EA)

S-Video Input (1EA)

Component Input (2EA)

RGB Input

HDMI Input(3EA)

Audio Input (6EA)

SPDIF Out(1EA)

USB

No Item Specification Remark

Australia

1) PAL-BG

2) DVB T

Analog : Upper Heterodyne

Digital : COFDM

PAL, NTSC

Y/Cb/Cr, Y/Pb/Pr

RGB-PC

HDMI-PC

HDMI-DTV

RGB/DVI Audio, Component, AV

SPDIF Out

X-Studio(JPEG,MP3), Upgrade(USB1.3)

Rear AV 1EA, Side AV 1EA

Side AV

Analog(D-Sub 15Pin)

HDMI1/DVI,HDMI2,HDMI3(Side)

Side

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Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Object

These instructions are applied all of the 50” PLASMA TV,

PA81A Chassis.

2. Note

(1) Because this is not a hot chassis, it is not necessary to use

an isolation transformer. However, the use of isolation

transformer will help protect test instrument. (2) Adjustment must be done in the correct order. (3) The adjustment must be performed in the circumstance of

25±5°C of temperature and 65±10% of relative humidity if

there is no specific designation. (4) The input voltage of the receiver must keep 100-240V~,

50/60Hz. (5) The receiver must be operated for about 15 minutes prior

to the adjustment.

O After RGB Full white HEAT-RUN Mode, the receiver must

be operated prior to adjustment.

O Enter into HEAT-RUN MODE

1) Press the POWER ON KEY on R/C for adjustment.

2) OSD display and screen display PATTERN MODE.

- Select “3. Test Pattern” by using

D/E(CH+/-) and

press ENTER(

- Select “White” by using (

F/GVOL+/-) and press

ENTER(

* Set is activated HEAT-RUN without signal generator in

this mode. * Single color pattern(RED/BLUE/GREEN) of HEAT-RUN

mode uses to check PANEL.

S/W auto download using the USB

Memory stick

(1) Insert the USB memory sick the PCB ASSEMBLY. (2) Using ‘power on’ button of the control R/C, power on TV. (3) S/W download process is executed automatically.

Auto-control adjustment process

All adjustment process is executed one time through RS-232C.

V Command send -> ADC Calibration -> Model name

download -> EDID download.

V Adjsutment process protocol(RS-232C)

5. Manual model name download

(1) Press ADJ KEY on R/C for model name D/L. (2) Select “0.Model Option” and press ENTER(

V).

(3) Select model name by using

D/E (CH+/-)and press

ENTER(

V).

* Using ‘power on’ button off the control R/C, power on TV. All adjustment process is executed one time through RS-232C. Do not connect extrenal input calbe.

* Using ‘power on’ button of the control R/C, power on TV. USB file(EPK) version must be bigger than downloaded version of main B/D.

* Using ‘power on’ button off the control R/C, power on TV.

Ready

ADC

Confirmation

ADC

Mode Out

Download

Mode In

EDID

Download

Check EDID

Status

Define model

name

Adjustment

Confirmation

Download

Mode Out

Item

Remark

CMD1 CMD2

Data 0

0~4,9

1~7

Ready

ADC start

Transmitting adjustment mode In

instruction, operate adjustment command.

All=0 ; HDMI1,2,3,4=1,2,3,4 ; RGB=9

Model define index(Data0) are listed at

next table.

EDID data existence check in SET

assembly

ae53

50PG20D-AA

CMD1 CMD2 Data 0 Remark

50PG20D-AA

32013360

Model Name Model Option Value

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Only for training and service purposes

6. Manual

ADC Adjustment

V Adjustment is done using internal ADC, so input signal is

not necessary.

V Do not connect external input cable.

6-1. Required Equipment

(1) Press ADJ KEY on R/C and enter EZ ADJUST. (2) Select “1.EDID D/L” by using

D/ E(CH+/-) and press

ENTER(

V).

(3) Select “Start” by using

F/G(VOL+/-) and press ENTER(V).

(4) ADC Adjustment is executed automatically.

7. EDID Download

7-1. Required Equipment

(1) Press ADJ KEY on R/C and enter EZ ADJUST. (2) Select “5.EDID D/L” by using

D/E(CH+/-) and press

ENTER(

V).

(3) Select “Start” and press ENTER(

V).

(4) EDID download is executed automatically. (5) Press EXIT key on R/C.

7-2.

EDID DATA

(1) RGB EDID

(2) HDMI 1

(3) HDMI 2

(4) HDMI 3

1.[1]-Product ID

*Do not connect HDMI and RGB cable.

NO SIGNAL or White noise NO SIGNAL

RF Input AV / Component / RGB input

50PG20D

Product ID

Product ID HDMI

Model

Name

EDID table

C3C3

C4C3

Analog(RGB)

Digital(HDMI) 3EA

Hex

C3C3

C3C4

501155

500116

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Only for training and service purposes

8. POWER PCB Assy Voltage Adjustments (Va, Vs Voltage adjustments)

8-1. Test Equipment : D.M.M. 1EA

8-2.Connection Diagram for Measuring

: refer to Fig.1

8-3. Adjustment Method

(1) Va Adjustment

1) After receiving 100% Full White Pattern, HEAT RUN.

2) Connect + terminal of D.M.M to Va pin of P811, connect

- terminal to GND pin of P811.

3) After turning VR901, voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top. (Deviation; ±0.5V)

(2) Vs Adjustment

1) Input signal : RF noise signal.

2) Connect + terminal of D.M.M to Vs pin of P811, connect – terminal to GND pin of P811.

3) After turning VR951, voltage of D.M.M adjustment as same as Va voltage which on label of panel right/top. (Deviation; ±0.5V)

9. Adjustment of White Balance

9-1. Required Equipment

(1) Color Analyzer : CA-1000, CA-100+(CH.10) CA-210(CH.10).

* Please adjust CA-100+/CA-210 by CS-1000 before

measuring.

-> You should use Channel 10 which is Matrix compensated(White, Red, Green, Blue revised) by CS1000 and adjust in accordance with balance adjustment coordinate.

W Color temperature standards according to CSM and Module.

W Change target luminance and range of the Auto adjustment

W/B equipment.

W White balance adjustment coordinate and color temperature.

* PC(for communication through RS-232C)

-> UART Baud rate : 115200 bps

Each PCB assembly must be checked by check JIG set. (Because power PCB Assembly damages to PDP Module, especially be careful)

(Fig.1) Connection diagram of power adjustment for measuring

(Fig.2) 50” Full HD Power PCB Assy Voltage adjustment

* Press the POWER ON KEY on R/C before Model name download.

Befor adjusting White-balance, the AV ADC should be done. If ADC status were “NG”, Need to ADC adjustment.

PLASMA Remark

11000K

9300K

6500K

Cool

Normal

Warm

CSM

Range

Target luminance

0.276

0.283

0.000

0.276±0.002

0.283±0.002

0.000

0.276±0.002

0.283±0.002

0.000

Cool CS-1000 CA-100+(CH.10) CA-210(CH.10)

0.285

0.293

0.000

0.285±0.002

0.293±0.002

0.000

0.285±0.002

0.293±0.002

0.000

Medium CS-1000 CA-100+(CH.10) CA-210(CH.10)

0.313

0.329

0.003

0.313±0.002

0.329±0.002

0.003

0.313±0.002

0.329±0.002

0.003

Warm CS-1000 CA-100+(CH.10) CA-210(CH.10)

9-2. Connection Picture of the Measuring

Instrument(On Automatic control)

(1) Inside PATTERN is used when W/B is controlled. Connect

to auto controller or push control R/C IN-START -> Enter the mode of White-Balance, the pattern will come out.

9-3. Auto-control interface and directions

(1) Adjust in the place where the influx of light like floodlight

around is blocked.(illumination is less than 10ux)

(2) Measure and adjust after sticking the Color Analyzer(CA-

100+, CA210) to the side of the module.

(3) Aging time

- After ajing start, keep the power on(no suspension of power supply) and heat-run over 15minutes.

- keep white pattern using inside pattern.

V Auto adjustment Map(RS-232C)

10. Adjustment of White Balance

(1) Press ADJ KEY on R/C and enter EZ ADJUST.

Select “3. Test Pattern” by using

D/E(CH+/-) and press

ENTER(

Select “White” by using

F/G(VOL+/-) and press ENTER(V)

and heat run over 15minutes.

(2) Zero Calibrate CA-100+/CA-210, and when controlling,

stick the sensor to the center of PDP module.

(3) Press ADJ KEY on R/C and enter EZ ADJUST.

Select “2. White Balance” and press

G(VOL +).

Set test-pattern on and display inside pattern.

(5) Control is carried out on three color temperatures, COOL,

MEDIUM,WARM. (Control is carried out thress times)

- R-Cut / G-Cut / B-Cut is set to 64

- Control R-Gain and G-Gain.

- Each Gain is limited to 192.

- R-Cut / G-Cut / B-Cut is set to 64

- Control R-Gain and G-Gain.

- Each Gain is limited to 192.

- R-Cut / G-Cut / B-Cut is set to 64

- Control G-Gain and B-Gain.

- Each Gain is limited to 192.

11. Input the Shipping Option Data

1) Push the IN-START key in a Adjust Remocon.

2) Input the Option Number that was specified in the BOM, into the Shipping area.

3) The work is finished, Push

V Key.

12. Set Information (Serial No& Model name)

12-1.

Check the serial number & Model Name

(1) Push the menu button in DTV mode. (2) Select the SETUP -> Diagnostics -> To set. (3) Check the information.

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Only for training and service purposes

(Fig.3) Auto AV(CVBS) Color Balance Test Pattern

Full White Pattern

RS-232C Communication

CA-210

Color

ANALYZER

TYPE : CA-210

R Gain

G Gain

B Gain

R Cut

G Cut

B Cut

Cool Med Warm Cool Med Warm

jg Ja js 00 192 192 192 255

jh Jb je 00 192 192 192 255

ji Jc jf 00 192 192 192 255

64 64 64 128’

64 64 64 128

RS-232C COMMAND

[CMD ID DATA]

Min

CENTER

(DEFAULT)

MAX

+ 19 hidden pages

LG 50PG20D, 50PG20D-AA, 42PG60UD, 42PG60UD-AA Service Manual

Specifications and Main Features

Frequently Asked Questions

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