LG 42PC1D-DAB Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PA-61B

MODEL : 42PC1D/DA 42PC1D/DA-UB

CANADA : http//biz.lgservice.com USA : http//www.lgservice.com

: http//biz.lgservice.com

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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 lsolation 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 circuitary that may be inadvertently introduced during the service operation.

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

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.

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 positioin, 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 esposed 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 sepcified, 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

CANADA: LG Electronics Canada, Inc. 550 Matheson

Boulevard East Mississauga, Ontario L4Z 4G3

USA : LG Customer Interactive Center

P.O.Box 240007, 201 James Record Road Huntsville, AL 35824 Digital TV Hotline 1-800-243-0000

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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DESCRIPTION OF CONTROLS...........................................4

SPECIFICATIONS.................................................................8

ADJUSTMENT INSTRUCTIONS ..........................................9

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

EXPLODED VIEW...............................................................30

EXPLODED VIEW PARTS LIST.........................................31

REPLACEMENT PARTS LIST............................................32

SCHEMATIC DIAGRAM..........................................................

PRINTED CIRCUIT BOARDS.................................................

TABLE OF CONTENTS

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CONTROLS

This is a representation of the front panel of models 42PC1DA series TVs. Here shown may be somewhat different from your TV.

Front Panel Controls

CHCH

VVOLOL

MENUMENU

INPUTINPUT

TV GUIDETV GUIDE

Remote Control Sensor

POWER Button

TV GUIDE Button

INPUT Button

MENU Button

VOLUME (

FF,GG

)Buttons

CHANNEL (

EE,DD

)Buttons

Power Standby Indicator Illuminates red in stand-

by mode. When the TV is turned on, the indicator blinks white and then illuminates white before the picture is displayed.

DESCRIPTION OF CONTROLS

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CONNECTION OPTION

Back Connection Panel

Cable CARD

HDMI INHDMI IN

DIGITAL AUDIO DIGITAL AUDIO

OUTOUT

OOPTICALPTICAL

1 (DVI)1 (DVI)

RS-232C INRS-232C IN

(CONTROL(CONTROL && SERVICE)SERVICE)

RGB (PCRGB (PC//DTV)DTV)

RGB INRGB IN

AUDIO (RGB/DVI)AUDIO (RGB/DVI)

COMPONENT INCOMPONENT IN

VIDEOVIDEO

AUDIOAUDIO

VIDEOVIDEO

AUDIOAUDIO

MONO

(( ))

S-VIDEOS-VIDEO

AV IN 1AV IN 1

AV OUTAV OUT

ANTENNAANTENNA

ININ

CABLECABLE

ININ

REMOTEREMOTE

CONTROL INCONTROL IN

S-VIDEO Input

Provides better picture quality than the video input.

AUDIO Input

Connections are available for listening to stereo sound from an external device.

VIDEO Input

Connects the video signal from a video device.

CableCARD

™

Used for CableCARD

™

Cable Service Provider.

This is a back panel of 42PC1DA.

AV OUT Connect a second TV or monitor.

AV (Audio/Video) IN 1 Connect audio/video output from an external

device to these jacks. S-VIDEO Connect S-Video out from an S-VIDEO device.

COMPONENT IN Connect a component video/audio device to these

jacks. HDMI IN

Connect a HDMI signal to 1(DVI) or 2. Or DVI(VIDEO)signal to the 1(DVI) port with a DVI

to HDMI cable. DIGITAL AUDIO OUT

Connect digital audio from various types of equipment. Note: In standby mode, these ports do not work.

RS-232C IN (CONTROL & SERVICE) PORT Connect to the RS-232C port on a PC.

ANTENNA IN Connect over-the air signals to this jack. CABLE IN Connect cable signals to this jack.

RGB/AUDIO IN Connect the monitor output from a PC to the

appropriate input port. Remote Control Port

Connect your wired remote control. Power Cord Socket

For operation with AC power. Caution: Never attempt to operate the TV on DC power.

1 6

5 6

DESCRIPTION OF CONTROLS

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REMOTE CONTROL KEY FUNCTIONS

When using the remote control, aim it at the remote control sensor on the TV.

APM

AUTO DEMO

M/C EJECT

1 2 3 4 5 6

7 8

FLASHBK

VOL CH

MUTE

FAV

PAGE

INFO i

TV GUIDE

ENTER

EXIT

SAP

RATIO

POWER

DAY -

DAY+

VCR

DVD

AUDIO

CABLE

STB

MODE

TV INPUT

INPUT

MODE

DAY+/DAY-

INFO

TV GUIDE

THUMBSTICK

(Up/Down/Left

Right/ENTER)

EXIT

SAP

RATIO

VOLUME UP

/DOWN

MUTE

FAV

CHANNEL

UP/DOWN

PAGE UP/

PAGE DOWN

— (DASH)

FLASHBK

Select the remote operating mode: TV, DVD, VCR, AUDIO, CABLE or STB.

Control video cassette recorders or DVD players.

Move the Listings Grid forward or backward in 24 hour increments.

Displays the main menu. Enters or exits a Panel Menu in the TV Guide On Screen system.

Display information at the top of the screen.

Displays the TV Guide On Screen system.

Navigate the on-screen menus and adjust the system settings to your preference.

Clear all on-screen displays and return to TV viewing from any menu.

Analog mode: Selects MTS sound(Mono, Stereo, and a SAP) DTV mode: Change the audio language.

Select a closed caption. (*In DTV/CADTV mode

Change the aspect ratio.

Increase/decrease the sound level.

Switch the sound on or off.

Scroll through the programmed Favorite channels.

Select available channels.

Move from one full set of screen information to the next one.

Used to enter a program number for multiple program channels such as 2-1, 2-2, etc.

Tune to the last channel viewed.

VCR/DVD

control buttons

NUMBER but-

DESCRIPTION OF CONTROLS

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APM

TIMER

ADJUST

SWAP

PIP CH +PIP CH -

PIP

PIP INPUT

7 8

FLASHBK

EZ SOUND

EZ PIC

Inside the Sliding Cover

POWER

TV INPUT

INPUT

Turns your TV or any other programmed equipment on or off, depending on the mode.

In AV 1-2, Component 1-2, RGB-DTV (or RGB-PC), HDMI1/DVI, and HDMI2 input sources, screen returns to the last TV channel.

External input modes rotate in regular sequence: Antenna, Cable, AV1-2, Component 12, RGB-DTV (or RGB-PC), HDMI1/DVI and HDMI2 (AV 12, Component 1-2, RGB-DTV (or RGB-PC), HDMI1/DVI, and HDMI2 input sources are linked automatically, only if these are connected ).

TIMER

APM

ADJUST

Select the amount of time before your TV turns off automatically.

Compare the Daylight, Normal, Night Time and User1(or2) on the screen.

Adjust the screen position,size,and phase in PC mode.

PIP

PIPCH-

/PIPCH+

PIP INPUT

SWAP

EZ PIC

EZ SOUND

Switches the sub picture PIP, POP, Twin picture or off mode.

Changes the PIP channel. Select the connected input source for the

sub-picture. Exchange the main/sub images. Adjust the factory preset picture depend

on the viewing environment. Select the appropriate type of sound for

type of program.

DESCRIPTION OF CONTROLS

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The specifications shown above may be changed without prior notice for quality improvement.

42PC1DA

(42PC1DA-UB)

MODELS

44.4 x 29.5 x 15.0 inches

1129.0 x 748.5 x 380.0 mm

44.4 x 27.4 x 4.1 inches

1129.0 x 695.0 x 103.7 mm

61.1 pounds / 27.7 kg

53.4 pounds / 24.2 kg

AC100-240V ~ 50/60Hz

NTSC-M, ATSC, 64 & 256 QAM

VHF 2-13, UHF 14-69, CATV 1-135, DTV 2-69, CADTV 1-135

75 ohm

32 ~ 104°F (0 ~ 40°C)

Less than 80%

-4 ~ 140°F (-20 ~ 60°C) 0 ~ 85%

Dimensions (Width x Height x Depth)

Weight

Power requirement Television System Program Coverage External Antenna

Impedance

Environment condition

including stand

excluding stand

including stand excluding stand

Operating Temperature Operating Humidity

Storage Temperature Storage Humidity

SPECIFICATIONS

1. Application Object

These instructions are applied to all of the PDP TV, PA61B.

2. Notes

(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 equipment. (2) Adjustments must be done in the correct order. (3) The adjustments 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 be must kept 110V, 60Hz

when adjusting. (5) The receiver must be operational for about 15 minutes

prior to the adjustments.

O Preliminary action is applied to the test for afterimage

discharge detection, and 100% FULL WHITE PATTERN must be operated automatically.

O Test for afterimage discharge detection

1) After pressing Power Only key(only operating by pressing Power Only key), Full Test Pattern(2 min 30sec) --> Full Black Pattern(30sec) --> After this state, Full White Pattern is displayed. (but you must preset the program for Full White State when you press the Main Power Off/On)

2) Pattern Mode is deselected by pressing CH +/-, Exit Key.

[ Set is activated HEAT-RUN without signal generator in this

mode.

3. EPLD Download

(1) Test Equipment: PC, Jig for download (2) Connect the power of VSC B/D. (3) Execute download program(iMPACK) of PC. (4) After executing the hot key on the Programmer, click icon (5) End after confirming

4. Gemstar VBI Micom Download

4-1. Preparation for Adjustment

(1) As shown below, connect the MPLAB ICD2 equipment, PC

and Digital Connector. (2) Turn on the MPLAB ICD2 POWER Supply. (3) After turn on the PC and MONITOR, select the ‘MPLAB

IDE’ from the screen.

4-2. Adjustment Sequence

(1) When the program is executed, select the MPLAB ICD2

from Programmer -> Select Programmer .

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ADJUSTMENT INSTRUCTIONS

+13V

Connect the MPLAB ICD2 and connector of Digital Board

Connect the RS-232 or USB Cable

GND Data

VSC

B/D

Connection Diagram of EPLD Download

Test Pattern 2min 30sec

Test Pattern 30sec

If you turn on a still screen more than 20 minutes (Especially Digital pattern(13 CH), Cross Hatch Pattern), an afterimage may occur in the black level part of the screen.

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(2) Select "Configure -> Select Device".

(3) When the "Select Device" window appears, select the

PIC18F1220 from "Device" and press OK.

(4) Select "Programmer -> Connect".

When connected with the Micom, the display message on the Output window appears as below.

(5) Select "File -> Import", select the Work HEX file and open.

(6) Select "Programmer -> Program".

(7) Download is executed and about 5 seconds later, the

"Programming succeeded" message is displayed on the

Output window and the Download process is ended.

(8) The execution of process (6) is convenient when using the

short-cut icon.

5. POD Certificate Download

5-1. Preparation for Adjustment

(1) Connect the MEMORY JIG and PC. (2) Turn on the JIG MAIN POWER SWITCH. (3) After turn on the PC and MONITOR, execute the

‘Certificate Downloader v1.4’ from the screen.

5-2. Adjustment Sequence

(1) After open the ‘Certificate Downloader v1.4’, enter

Connection set and set the as same below.

The port settings are determined by each PC's setup.

ADJUSTMENT INSTRUCTIONS

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ADJUSTMENT INSTRUCTIONS

(2) Select ‘Connection’ and SET connected to RS-232C. (3) After clicking "Enter", confirm that "Enter Password:"

appears.

(4) Click the "OpenFile - Download" button from CP Data

Download, ‘select the Private Key’ appears and click ENTER.

(5) After clicking ENTER, the ‘opens Private key' window

appears and select the Private key applied to the SET. The Private Key file name is on the Label of the Digital Board.

(6) When the Dialog window appears, click OK and the write

work will begin.

(7) When completed, click ‘CP Data Download: OK’

[ When ‘CP Data Download: OK’ does not appear, certificate

has not Download correctly.

SET is rebooted and certificate Download work must be

repeated.

6. Gemstar Operation Confirmation

6-1. Required Test Equipment

(1) PC with Factory Test Program (2) VBI Inserter (Norpak TES3) - Guide Data Discharge

Equipment

[ In case of without the VBI Inserter(TES3), a VCR may be

used.

6-2. Preparation for Adjustments

(1) In case of with VBI Inserter(TES3): Signal uses Cable

input and set as below.

Input Signal

RS-232C

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ADJUSTMENT INSTRUCTIONS

(2) In case of without VBI Inserter(TES3): VCR uses Cable

input and set as below.

[ Factory Test S/W must be set to "GlinkTo PC Card" ON.

6-3. Adjustment Confirmation Work

(1) Turn on the TV and run Factory Test Program of PC.

[ Program only needs to run once, regardless of set quantity.

(2) Enter the EZ adjust menu by pressing Adjust on the

Service Remote Control (S R/C). (3) Go to number 1 Gemstar and press Enter. (4) TV set screen will appear as shown.

(5) Confrim that VBI Test and Serial Test PASS from the

screen.

7. Cable Operation Confirmation

(1) Confirm that the Cable Card is inserted in the slot. (2) Enter the EZ adjust menu by pressing the Adjust key on

the Service Remote Control (S R/C). (3) Go to number 2 Cable Check and press the Right key (

G) .

(4) Confirm items below.

8. POWER PCB Assy Voltage Adjustment

(Va, Vs Voltage Adjustment)

8-1. Test Equipment :D.M.M 1EA 8-2. Connection Diagram for Measuring

Refer to Fig 1.

Name

Descrambler

Check

CableCARD

OOB Path FDC_SNR

Video Signal

Normal

CableCARD

is inserted.

OK(Lock)

OK(20dB above)

Normal Screen

Defective

Not OK

CableCARD

is removed.

Not OK(Unlock)

Not OK(20dB under)

Black Screen

(No Picture)

Each PCB Assy must be checked by Check JIG Set before assembly. (Especially, be careful Power PCB Assy which can cause Damage to the PDP Module.)

<Fig. 1-1> Connection Diagram of Power Adjustment for

Measuring (Power Board): 42”

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ADJUSTMENT INSTRUCTIONS

8-3. Adjustment (42”)

(1) Va Adjustment

1) Connect + terminal of D.M.M to Va pin of P812 and connect – terminal to GND pin of P812.

2) Adjust VR901 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P812 and connect – terminal to GND pin of P812.

2) Adjust VR951 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

8-4. Adjustment (50”)

(1) Va Adjustment

1) Connect + terminal of D.M.M to Va pin of P805 and connect – terminal to GND pin of P805.

2) Adjust VR901 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P805 and connect – terminal to GND pin of P805.

2) Adjust VR951 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

8-5. Adjustment (60”)

(1) Va Adjustment

1) Connect + terminal of D.M.M to Va pin of P805 and connect – terminal to GND pin of P805.

2) Adjust RV501 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

(2) Vs Adjustment

1) Connect + terminal of D.M.M to Vs pin of P805 and connect – terminal to GND pin of P805.

2) Adjust RV401 voltage to match that of the label on the Top/Right of the panel. (Deviation : ±0.5V)

9. EDID(The Extended Display

Identification Data)/DDC (Display Data Channel) Download

This is the function that enables “Plug and Play".

9-1. HDMI EDID Data Input

(1) Required Test Equipment

1) PC, Jig for adjusting DDC. (PC serial to D-sub Connection equipment)

2) S/W for writing DDC(EDID data write & read)

3) D-Sub cable

4) Jig for HDMI Cable connection

(2) Preparation for Adjustments &

Setting of Device

1) Set devices as below and turn on the PC and JIG.

2) Open S/W for writing DDC (EDID data write & read). (operated in DOS mode)

VR95 VR90

GND

DMM

P805

GND 5V

P804

CN1CN1

P800

P803

P802

<Fig. 1-2> Connection Diagram of Power Adjustment for

Measuring (Power Board): 50”

<Fig. 1-3> Connection Diagram of Power Adjustment for

Measuring (Power Board): 60”

PDP TV SET

(or Digital Board)

<Fig. 2>

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ADJUSTMENT INSTRUCTIONS

9-2. EDID DATA for PA-61B

: EDID for HDMI-1 (DDC (Display Data Channel) Data)

EDID table =