LG 42PC1DA-EC, 42PC1DA Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PD61A

MODEL : 42PC1DA

42PC1DA-EC

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

- 2 -

CONTENTS

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

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

SPECIFICATIONS..............................................................................................10

ADJUSTMENT INSTRUCTIONS .......................................................................12

TROUBLE SHOOTING GUIDE..........................................................................17

PRINTED CIRCUIT DIAGRAM ..........................................................................22

BLOCK DIAGRAM.............................................................................................26

EXPLODED VIEW..............................................................................................28

EXPLODED VIEW PARTS LIST........................................................................29

REPLACEMENT PARTS LIST...........................................................................30

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

- 3 -

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 1M‰ and 5.2M‰.
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

POWER

Switches the set between ON and STANDBY.

D/A TV

INPUT

VOL

LIST

Q.VIEW

PR

POWER

1 2 3

4 5 6
7809

INDEX

POSITION

SIZE

REVEAL

I/II

TIME

GUIDE

PIP PR-

PIP

MENU

MUTE FAV

EXIT

VCR

TV

DVD

ARC

TEXT

SWAP

BACK

PIP PR+

INFO

i

?

i

OK

SUBTITLE/

PIP INPUT

SLEEP

D/A TV (Digital TV / Analogue TV)

Selects digital or analogue mode.

INPUT

Selects the DTV, TV, AV, Component, RGB or HDMI
modes.
switches the set on from standby.

TV, DVD, VCR

Selects the remote operating mode: TV, VCR, DVD.
Select other operating modes, for the remote to oper­ate external devices.

GUIDE

Shows programme schedule.

ARC (Aspect Ratio Control)

Selects your desired picture format.

SUBTITLE/

*

Recalls your preferred subtitle in digital mode.

PIP

Switches the sub picture on or off,select PIP, DW1/2
or POP modes.

SIZE

Adjusts the sub picture size.

POSITION

Moves the sub picture position.

PIP PR +/-

Selects a programme for the sub picture.

SWAP

Alternates between main and sub picture.

PIP INPUT

Selects the input mode for the sub picture.

BACK

Allow the user to move back one step in an inter­active application, EPG or other user interaction
function.

SLEEP

Sets the sleep timer.

- 4 -

DESCRIPTION OF CONTROLS

- 5 -

MENU

Displays on screen menus one by one.
Exits the current menu.
Memorizes menu changes.

OK

Accepts your selection or displays the current
mode.

DD / EE / FF / GG

Adjusts menu settings.
Selects menu item.

COLOURED BUTTONS

They are used as per the indications or functions dis­played on TV screen in case of Text displays
(Teletext, EPG) and programme edit.

VOL

DD / EE

(Volume Up/Down)

Increases/decreases sound level.

PR

DD / EE

(Programme Up/Down)

Selects a programme.

LIST

Displays the programme table.

Q.VIEW

Returns to the previously viewed programme.

NUMBER BUTTONS

MUTE

Switches the sound on or off.

FAV (FAVOURITE)

Displays the selected favourite programmes.

D/A TV

INPUT

VOL

LIST

Q.VIEW

PR

POWER

1 2 3

4 5 6
7809

INDEX

POSITION

SIZE

REVEAL

I/II

TIME

GUIDE

PIP PR-

PIP

MENU

MUTE FAV

EXIT

VCR

TV

DVD

ARC

TEXT

SWAP

BACK

PIP PR+

INFO

i

?

i

OK

SUBTITLE/

PIP INPUT

SLEEP

EXIT

Clears all on-screen displays and returns to TV
viewing from any menu.

TELETEXT BUTTONS

These buttons are used for teletext.
Text button is used to enable teletext services while
other buttons are for teletext functions. * For further
details, see the ‘Teletext’ section.

- 6 -

PR

VOL

OK

MENU

INPUT

PROGRAMME Buttons

VOLUME Buttons

MENU Button

OK Button

INPUT Button

POWER Button

Power/Standby
Indicator

• illuminates red in
standby mode.

• illuminates white
when the set is
switched on.

Front Panel Controls

- 7 -

AV IN 4

L/MONO

R

AUDIOAUDIO

VIDEOVIDEO

HDMI IN

DIGITAL AUDIO

OUT

OPTICAL

1(DVI)

2

RS-232C IN

(CONTROL & SERVICE)

RGB (PC/DTV)

RGB IN

AUDIO (RGB/DVI)

IN

OUT

VIDEO

AUDIO

MONO

( )

VIDEO

AUDIO

COMPONENT IN

S-VIDEO

AV IN 3

VARIABLE

AUDIO OUT

REMOTE

CONTROL IN

AV 1 AV 2 DTV OUT

ANTENNA

IN

ANTENNA

OUT

Eject Pcmcia card slot

AUDIO Input

VIDEO Input

DIGITAL AUDIO

OUT

OPTICAL

AV IN 3

V ARIABLE AUDIO OUT

AV 1/2

DTV OUT

COMPONENT IN

HDMI/DVI IN

42PC1DV/42PC1DVA

models have a unit of
HDMI / DVI input jack.

ANTENNA IN

ANTENNA OUT

AUDIO IN
(RGB/DVI)

RGB IN
(PC/DTV)

AC IN

RS-232C INPUT
(CONTROL&SERVICE)

REMOTE CONTROL Port

PCMCIA (Personal

Computer Memory Card

International Association)

Card Slot

Back Connection Panel

HDMI IN

- 8 -

ACCESSORIES

Owner’s Manual

Owner’s Manual

75Ω RF Coaxial

Power Cord

D/A TV

INPUT

VOL

LIST

Q.VIEW

PR

POWER

1 2 3

4 5 6

78

0

9

INDEX

POSITION

SIZE

REVEAL

TIME I/II

GUIDE

PIP PR-

PIP

MENU

MUTE FAV

EXIT

VCR

TV

DVD

ARC

TEXT

SWAP

BACK

PIP PR+

INFO

i

?

i

OK

SUBTITLE/

PIP INPUT

SLEEP

D/A

VOL

LIST

Q.VIEW

PR

1 2 3

4 5 6

78

0

9

INDEX

POSITION

SIZE

REVEAL

I/II

TIME

GUIDE

PIP PR-

PIP

MENU

MUTE FAV

EXIT

TV

ARC

TEXT

SWAP

BACK

PIP PR+

INFO

i

?

i

OK

SLEEP

VOL

LIST

Q.VIEW

1 2 3

4 5 6

78

0

9

POSITION

SIZE

TIME

MUTE FAV

Remote Control /

Batteries

2-Wall brackets

2-eye-bolts

For 42PC1D/DV/DVA,
42PC3D/DV, 50PC1D

Polishing Cloth

(42/50PC1D only)

Polish the screen

with the cloth.

2-bolts

(42PC1D/DV/DVA,

42PC3D/DV only)

- 9 -

STAND INSTALLATION (OPTION)

Figures shown here may be slightly different from your set.

When closing the stand for storage

First remove the screws in the holes (B) on the bottom
of the stand. And then pull two Hooks (D) of the stand
bottom
and fold the stand into the back of the set.

After folding, push two Locks (A) of the stand bottom

outward.

O Place the set with the screen facing down on a cushion or soft cloth as shown in Figures 1.

Before unfolding the stand, please make sure two locks (A) on the bottom of the stand push outward.

O Pull the stand out as shown above in Figures 2 ~ 3.

After unfolding the stand, please insert and tighten the screws in the holes (B) on the bottom of the
stand.

O When connecting cables to the set, Do not disengage the lock (C).

This may cause the set to fall, causing serious bodily injury and serious damage to the set.

A

D

A

C

B

B

1

3 4

2

* NOTE

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 PD61A 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 BOM.

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

1. Module Specification

- 10 -

Display Screen Device
Aspect Ratio
PDP Module

Operating Environment

Storage Environment

Input Voltage

1
2
3

4

5

6

No Item Specification Remark

42” Wide Color Display Module
16:9
PDP42X3,
RGB Closed Type, Film Filter

1)Temp. : 0~40deg

2)Humidity : 0~85%

3)Temp. : -20~60deg

4)Humidity : 0~85%
100-240~, 50/60H

Plasma Display Panel

Glass/Film type filter is TBD

LGE SPEC.

Maker LG

Chassis

PD61A 42PC1DA-EC The United Kingdom LG

Model Name Market Brand Remark

42PC1DA-EC Safety : IEC/EN60065

EMI : EN55013
EMS : EN55020

The United Kingdom

TEST

Model ApplianceMarket Remark

- 11 -

2. Model General Specification

Market
Broadcasting system

Receiving system

Scart Jack (3EA)
Video Input (2EA)
S-Video Input (1EA)
Component Input (1EA)
RGB Input

HDMI Input

Audio Input (4EA)
Wired Control

1
2

3

4
5
6
7
8

9

10
11

No Item Specification Remark

The United Kingdom

1) PAL-BG

2) PAL-DK

3) PAL-I, I’

4) DVB-T(ID TV)

5) SECAM-L
Analog : Upper Heterodyne
Digital : COFDM
PAL, SECAM
PAL, SECAM, NTSC
PAL, SECAM, NTSC
Y/Cb/Cr, Y/Pb/Pr
RGB-PC,
RGB-DTV
HDMI-PC
HDMI-DTV & SOUND
PC Audio, Component, AV (2EA)
Discrete I

UK

4 System : PAL, SECAM, NTSC, PAL60
4 System : PAL, SECAM, NTSC, PAL60

L/R Input

- 12 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions are applied to all of the 42” PLASMA TV,
PD61A 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 100-220V~,

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.

[ 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.

Caution) If you turn on a still screen more than 20 minutes,

(Especially digital pattern, cross hatch pattern) after
image may be occur in the black level part of the screen.

3. Channel memory

3-1. Setting up the LGIDS

1) Install the LGIDS. (idsinst.exe)

2) After installation, restart your PC.

3) Extract [files.zip] to folder [c:\LGIDS\files].

4) Start LGIDS.

3-2. Channel memory Method

1) Select “PDP” and “Hurricane” on Model dialog. And check
your connection in Communication dialog. (If your
connection is ‘NG’, then set your PORT(COM1,2,3,...)
correctly.)

2) Connect RS-232C cable and turn on the power.
(If your connection has completed, you can see “Ready”.)

[ If your set is not an end products but only a board, you

have to make your board to Stand-by state (LED_R). And
you have to Download in Stand_by power state.

3) Select proper CH_memory file(*.nvm) for each model at
[NVRAM Download] $ [Write Batch]
Next, select proper binary file(*.bin) including the CH
information for each model at [NVRAM File].

File name : H2_CH_Memory_RZ.nvm

4) Click the [Download] button.
It means the completion of the CH memory download if all
items show ‘OK’ and Status is changed by ‘PASS’ at the
lower right corner of the window.

5) If you want to check whether the CH information is
memorized correctly or not, click the [Verify] button.
And then compare NVRAM File(*.bin) with the CH
information downloaded.

(Fig. 1)

(Fig. 2)

(1)

(2)

(4)

(3)

(Fig. 3)

4. Sub Program Down Load

1) Select “ PDP” and “Hurricane” on Model dialog. and check
your connection in Communication dialog. (If your
connection is ‘NG’, then set your PORT(COM1,2,3,...)
correctly.

2) Connect RS232 cable and turn on the power. (Use the
special Cable for Sub-program)
(If your connection has completed, you can see ‘Ready’)

3) Select proper ‘Model’ for each model.

4) Select ‘flash file’ for each model.

5) Click the [Download] button.
It means the completion of the ROM download if all items
show ‘OK’ and Status is changed by ‘PASS’ at the lower
right corner of the window.

5. PCMCIA CARD Checking Method

1) You must adjust DTV 29 Channel and insert PCMCIA
CARD to socket.

2) If PCMCIA CARD works normally, normal signal display on
screen. But it works abnormally, “No CA module” words
display on screen.

6. POWER PCB Assy Voltage
Adjustments

(Va, Vs Voltage adjustments)

6-1. Test Equipment :D.M.M. 1EA
6-2.Connection Diagram for Measuring

: refer to fig.5

6-3. 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 P812, connect

- terminal to GND pin of P812.

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

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

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

7-1. Required Test 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

7-2. Setting of device

7-3. Preparation for Adjustment

1) As above Fig. 6, Connect the Set, EDID Download Jig, PC
& Cable.

2) Turn on the PC & EDID Download Jig. And Execute the
S/W : EDID TESTER Ver,2.5.

3) Set up S/W option.

Repeat Number : 5
Device Address : A0
PageByte : 8

4) Power on the Set.

- 13 -

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

(Fig. 5) Connection diagram of power adjustment for measuring

(Fig. 6) Connection Diagram of DDC download

(1)

(2)

(3)

(Fig. 4)

- 14 -

7-4. Sequence of Adjustment

- DDC data of Analog-RGB

1) Init the data.

2) Load the EDID data.(Open File).
[Analog(RGB) : 42PC1D-EC.ANA]
[Analog(RGB) : 42PC1DV-EC.ANA]
(for VGA, XGA)
[Digital(HDMI) : 42PC1D-EC.DVI] (XGA only)
[Digital(HDMI) : 42PC1DV-EC.DVI] (VGA only)
[Digital(HDMI) : 42PC1D-EC.DVI] (XGA only)
[Digital(HDMI) : 42PC1DV-ECI.DVI] (VGA only)

3) Set the S/W as below.

4) Push the “Write Data & Verify”button. And confirm “Yes”.

5) If the writing is finished, you will see the “OK” message.

8. Auto AV(CVBS) Color Balance

8-1. Requirement

V This AV color balance adjustment should be performed

before white Balance Adjustment.

V It is very import to use adjustment pattern like Fig.7.

1) Within the pattern, color sequence should be aligned
: W-Y-C-G-M-R-BLUE-BLACK.
(If color sequence is reversed (Black -> ... -> White),
reverse the pattern with REV key, when using Master
pattern generator like MSPG-925)

2) If minimum Black level and/or maximum White level is
not correct, select 100% color bar pattern.

8-2. Required Equipment

1) Remote controller for adjustment.

2) AV Pattern Generator.
: 802F Pattern Generator, Master(MSPG-925FA), etc.
(Which has PAL Composite Video format output with
standard(1.0 Vpp) Vertical 100% Color Bar Pattern as Fig7)

8-3. Method of Auto AV(CVBS) Color Balance

1) Input the PAL Composite Video into video input.
(Input 50Hz : AV3/AV4 Input)

2) Set the PSM to Standard mode in Picture menu.

3) Press IN-STAR key on R/C for adjustment.

4) Press the

G (Vol. +) key operate to set, then it becomes

automatically.

5) Auto-RGB OK means completed adjustment.

9. Adjustment of White Balance

9-1. Required Equipment

1) Remote controller for adjustment.

2) Color Analyzer.(CA-100 or same product)

3) Auto W/B adjustment instrument.(only for Auto adjustment)

4) AV Pattern Generator.

9-2. Connecting diagram of equipment for

measuring (For Auto Adjustment)

(Fig. 7) Auto AV(CVBS) Color Balance Test Pattern

(Fig. 8) Connection Diagram of Auto W/B Adjustment

- 15 -

W Auto adjustment Map(RS-232C)

9-3. Adjustment of White Balance

(For Manual adjustment)

O Operate the zero-calibration of the CA-100, then stick

sensor to PDP module surface when you adjust.

O For manual adjustment, it is also possible by the following

sequence.

1) Select white pattern of heat-run mode by pressing power on
key on remote control for adjustment then operate heat run
more than 15 minutes.

2) As below Fig.9, Supply 216Level (85 IRE) full screen
pattern to Video input.
(Input 50Hz, 42PC1DA : AV3/AV4 Input)

3) Press the TV/AV KEY on R/C for converting input mode.

4) Set the PSM to Standard mode in Picture menu.

5) Enter the White Balance adjustment mode by pressing the
INSTART key twice(White Balance) on R/C.

6) Stick sensor to center of the screen and select each items
(Red/Green/Blue Gain and Offset) using

D / E (CH +/-) key

on R/C.

7) Adjust Only High Light with R Gain/ B Gain using

F / G

(VOL+/-) key on R/C.

8) Adjust it until color coordination becomes as below.
(Initially, R/G/B gain and R/G/B offset values are fixed as
below

Red Gain : 82, Green Gain : 80, Blue Gain : 86
Red Offset : 7D, Green Offset : 7E, Blue Offset : 80)

[PD61A]-VGA 42”, XGA 42”,50” Module
Brightness : High Light : 80 ±20cd/m2
Color-Coordinate : High Light : X : 0.285 ±0.003

Y : 0.290 ± 0.003

Color Temperature : 9,300°K ± 500°K

9) When adjustment is completed, Exit adjustment mode using
EXIT key on R/C.

10. Auto Component Color Balance

10-1. Requirement

- It is very import to use correct adjustment pattern like Fig.10.

V Within the pattern, color sequence should be aligned

: W-Y-C-G-M-R-BLUE-BLACK.
(If color sequence is reversed(Black -> ... > White), reverse
the pattern with REV key, when using Master pattern
generator like MSPG-925)

V If Minimum Black Level and/or Maximum White Level is not

correct, select 100% Color Bar Pattern.

10-2. Required Test Equipment

1) Remote controller for adjustment.

2) 802F Pattern Generator.
(Which has 720p Ypbpr output with Standard(0.7Vpp)
Vertical 100% Color Bar Pattern as Fig.10)

10-3. Method of auto component color balance

1) Input the Component 720p 100% Color Bar signal into

Component1 or Component2.

2) Set the PSM to Standard mode in Picture menu.

3) Press INSTART key on R/C for adjustment.

4) Press the

G (Vol. +) key operate to set, then it becomes

automatically.

5) Auto-RGB OK means complete adjustment.

11. Auto RGB Color Balance

11-1. Requirement

- It is very import to use correct adjustment pattern like fig.11

V Within the pattern, color sequence should be aligned

: W-Y-C-G-M-R-BLUE-BLACK.
(If color sequence is reversed(Black -> ... > White), reverse
the pattern with REV key, when using Master pattern
generator like MSPG-925)

V If Minimum Black Level and/or Maximum White Level is not

correct, Do select 100% Color Bar Pattern.

11-2. Required Test Equipment

1) Remote controller for adjustment.

2) 802F Pattern Generator, Master(MSPG-925FA), etc.
(Which has XGA 60Hz PC Format output with standard
(0.7Vpp) 100% Color Bar Pattern as Fig.11)

(Fig. 10) Auto Component Color Balance Test Pattern

(Fig. 9) Pattern for Adjustment of White Balance

216 Level (85 IRE)216 Level (85 IRE)

Type

Baud Rate

115200

Index

R Gain

G Gain

B Gain

R Offset

G Offset

B Offset

Data bit

8

Cmd1 Cmd2

ja
jb
jc
jd
je
jf

Stop bit

1

Parity

NONE

PD61A : 42PC1DV-EC

Protocol

Setting

Data Min Value

00(00)
00(00)
00(00)
00(00)
00(00)
00(00)

Max Value

255(FF)
255(FF)
255(FF)
255(FF)
255(FF)
255(FF)