LG 42PG61UR-TA Service manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PP81A

MODEL : 42PG61UR 42PG61UR-TA

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 ............................................................................14

BLOCK DIAGRAM...................................................................................21

EXPLODED VIEW .................................................................................. 22

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 42” PLASMA TV used PP81A 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 : CE, IEC specification EMC : CE, IEC

V General Specification ( 42” XGA Module)

Display Screen Device

Aspect Ratio

PDP Module

Operating Environment

Storage Environment

Input Voltage

No Item Specification Remark

42” Wide Color Display Module

16:9

PDP42PG1,

RGB Closed Type

1)Temp. : 0~60deg

2)Humidity : 20~80%

3)Temp. : -10~60deg

4)Humidity : 10~90%

100-240V~, 50/60Hz

Plasma Display Panel

Glass Filter

LGE SPEC.

Maker : LGIT, Sansung

Chassis

PP81A 42PG61UR-TA Non-EU LG

Model Name Market Brand Remark

42PG61UR-TA Safety : IEC/EN60065, EMI : EN55013, EMS : EN55020Non-EU

Model ApplianceMarket

TEST

Remark

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Only for training and service purposes

Market

Broadcasting system

Available Channel

Receiving system

SCART Input(2EA)

Video Input (1EA)

S-Video Input (1EA)

Component Input (1EA)

RGB Input(1EA)

HDMIInput(2EA)

Audio Input (5EA)

USB Input(1EA)

No Item Specification Remark

Non EU

PAL-BG/I/DK, SECAM

BAND PAL

VHF/UHF C1~C69

CATV S1~S47

Upper Heterodyne

PAL

Y/Cb/Cr, Y/Pb/Pr

RGB-PC

HDMI-DTV

AV (2EA), SIDE AV(1EA)

Divx, MP3, JPEG

Full Scart 1EA, Harf 1EA

Side AV

Side AV : S-Video Priority

REAR HDMI(2)

L/R Input(PC 1EA, SCART 2EA,

SIDE AV 1EA, Component 1EA)

V Model Specification

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Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Range

This spec. sheet is applied to all of the PP81A Chassis.

2. Specification

(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±5cC 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) Before adjustment, execute Heat-Run for 30 minutes at RF

no signal.

3. ADC calibration

3-1. PC input ADC

(1) Auto RGB Gain/Offset Adjustment

1) Convert to PC in Input-source

2) Signal equipment displays

Output Voltage : 700 mVp-p

Impress Resolution XGA (1024 x 768 @ 60Hz)

Model : 60 in Pattern Generator

(1024x768@60Hz Black and White Pattern) Pattern : 54 in Pattern Generator (MSPG-925 SERISE) [1/2 Black & White Pattern (Refer below picture)].

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction.

(2) Confirmation

1) We confirm whether “0xF1 (offset), 0xF2 (gain)” address of EEPROM “0xBC” is “0xAA” or not.

2) If “0xF1”, “0xF2” address of EEPROM “0xBC” isn’t “0xAA”, we adjust once more

3) We can confirm the ADC values from “0x00~0x05” addresses in a page “0xBC”

[ Manual ADC process using Service Remocon. After enter

Service Mode by pushing “ADJ” key, execute “ADC Adjust” by pushing “

G” key at “Adjust-RGB”.

3-2. COMPONENT input ADC

(1) Component Gain/Offset Adjustment

1) Convert to Component in Input-source

2) Signal equipment displays Impress Resolution 720P MODEL : 217 in Pattern Generator

(720P/60Hz 100% Color Bar Mode)

PATTERN : 65 in Pattern Generator( MSPG-925 SERISE)

3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1) 0x00 0x02 instruction

(2) Confirmation

1) We confirm whether “0xF3 (offset), 0xF4 (gain)” address of EEPROM “0xBC” is “0xAA” or not.

2) If “0xF3”, “0xF4” address of EEPROM “0xBC” isn’t “0xAA”, we adjust once more.

3) We can confirm the ADC values from “0x06~0x0B” addresses in a page “0xBC

<Fig. 1>

Adjustment pattern (COMPONENT)

MSPG925FA

Component RGBADC

Model : 60

(1024x768@60Hz)

Model : 216

(720P@60Hz)

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Only for training and service purposes

4. PCB Assembly Adjustment Items

4-1. Option Adjustment Following BOM

Tool Option1 Tool Option2 Area Option

* Profile: Must be changed the option value because being

different with some setting value depend on module, inch and market

* Equipment : Adjustment Remote Controller

(1) Push the IN-START key in the Adjust R/C. (2) Input the Option Number that was specified in the BOM,

into the Shipping area.

(3) Select “Tool Option1/ Tool Option2/ Area Option” by using

D /E(CH+/-) key, and press the number key(0~9)

consecutively ex) If the value of Tool Option1 is 7, input the data using

number key “7” (Fig. 2)

Caution: Don’t Push “IN-STOP” key after PCB assembly

adjustment.

(4) Adjustment method

Before PCBA check, have to change the Tool option and Area option

[ About PDP

After done all adjustments, Press IN-START button and compare Tool option and Area option value with its BOM, if it is correctly same then Change “RF mode” and then unplug the AC cable. If it is not same, then correct it same with BOM and unplug AC cable. For correct it to the model°Øs module from factory JIG model.

[ Don’t push The IN-STOP KEY after completing the function

inspection.

5. S/W Program Download

5-1. Profile

This is for downloading the s/w to the flash memory of the IC803

5-2. Equipment

(1) PC (2) ISP_tool program (3) Download jig

5-3. Connection Structure

5-4. Connection Condition

(1) IC name and circuit number : Flash Memory and IC803 (2) Use voltage : 3.3V (5 pin) (3) SCL : 15 pin (4) SDA : 12 pin (5) Tact time : about 2min and 30seconds

6. Download Method (PCB Ass’y)

6-1. Preliminary Steps

(1) Connect the download jig to D-sub jack

(2) Connect the PC to USB jack

<Fig. 2>

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Only for training and service purposes

6-2. Download Steps

(1) Execute ‘ISP Tool’ program in PC, then a main window will

be opened

(2) Click the connect button and confirm “Dialog Box”.

(3) Click the Config button and Change speed

E2PROM Device setting : over the 350Khz

(4) Read and write bin file

Click “(1)Read” tab, and then load download file(XXXX.bin) by clicking “Read”.

(5) Click “Auto(2)” tab and set as below (6) Click “Run(3)”. (7) After downloading, check “OK(4)” message.

7. EDID(The Extended Display Identification Data) / DDC

(Display Data Channel) Download

[ Caution

- Use the proper signal cable for EDID Download

- Never connect HDMI & D-SUB Cable at the same time.

- Use the proper cables below for EDID Writing

7-1. Profile: To be possible for plug and play

7-2. Equipment

(1) Adjusting PC with S/W for writing EDID Data.(S/W: EDID

TESTER Ver.2.5) (2) A Jig for EDID Download (3) Cable : Serial(9Pin or USB) to D-sub 15Pin cable, D-sub

15Pin cable, DVI to HDMI cable.

7-3. Connection Structure

Caution: Never connect HDMI & D-SUB Cable at the same time.

7-4. EDID Data

O XGA EDID DATA

<Fig. 3> Connection Diagram of DDC Download

Manufaturer

Version

Revision

GSM

Digital : 1

Digital : 3

1E6D

ConditionItemNo Hex Data

+ 18 hidden pages