lg 42PC3DV, 42PC3DV-UD, 42PC3D-UD Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : PA-51D

MODEL : 42PC3DV 42PC3DV-UD

MODEL : 42PC3D 42PC3D-UD

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

: http//biz.lgservice.com

- 2 -

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 [phone]

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

- 3 -

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

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

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

BLOCK DIAGRAM...............................................................13

EXPLODED VIEW..........................................................16,18

EXPLODED VIEW PARTS LIST....................................17,19

REPLACEMENT PARTS LIST............................................20

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

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

TABLE OF CONTENTS

- 4 -

Controls

Controls

- This is a simplified representation of front panel.

- Here shown may be somewhat different from your TV.

CHCH

VVOLOL

ENTERENTER

MENUMENU

INPUTINPUT

CHANNEL (D, E)
Buttons

VOLUME (F,G)
Buttons

ENTER Button

MENU Button

INPUT Button

Remote Control Sensor

Power/Standby Indicator

• illuminates red in standby mode.

• illuminates green when the set is switched on.

(Power) Button

DESCRIPTION OF CONTROLS

- 5 -

Connection Options

Connection Options

MONO

AUDIO

S-VIDEO

VIDEO

HDMI/DVI IN

DIGITAL A UDIO

OUT

PTICAL

RS-232C IN

(CONTROL

SERVICE)

RGB (PC

DTV)

RGB IN

AUDIO (RGB/DVI)

VIDEO

AUDIO

VIDEO

AUDIO

COMPONENT IN

S-VIDEO

AV IN 1

AV OUT

ANTENNA

CABLE

REMOTE

CONTROL IN

- Here shown may be somewhat different from your TV.

AUDIO Input

S-VIDEO Input

VIDEO Input

DIGITALAUDIO OUT

OPTICAL

AV OUT

AV IN1

COMPONENT IN 1/2

HDMI/DVI IN

ANTENNA IN

CABLE IN

AUDIO(RGB/DVI)

RGB (PC/DTV)

AC IN

RS-232C INPUT
(CONTROL&SERVICE)

REMOTE CONTROL Port

DESCRIPTION OF CONTROLS

AV OUT

(( ))

MONO

AUDIO

AV IN 1

S-VIDEO

VIDEO

VIDEO

COMPONENT IN

AUDIO

AV IN 2AV IN 2

S-VIDEO

RR

AUDIO

L/L/MONO

VIDEO

HDMI/DVI IN

DIGIT A L AUDIO

OUT

OOPTICAL

RS-232C IN

(CONTROL

&&

SERVICE)

ANTENNA

ININ

CABLE

ININ

RGB IN

AUDIO (RGB/DVI)

RGB (PC

//

DTV)

REMOTE

CONTRO L IN

AC IN

- 6 -

Remote Control Key Functions

Remote Control Key Functions

POWER

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

VOL

CH

POWER

1 2 3

4 5 6

7 8

0

9

MENU

MUTE

FAV

DAY -

GUIDE

DAY+

RATIO

VCR

TV

DVD

ENTER

APM

ADJUST

SAP

EZ SOUND

EZ PIC

FREEZE

FLASHBK

PAGE

PAGE

EXIT

TIMER

CC

INFO

AUDIO

CABLE

STB

MODE

TV INPUT

INPUT

TV INPUT

Rotates the input mode between Antenna and Cable. In AV1­2, Component 1-2, RGB-DTV (or RGB-PC), and HDMI/DVI
input sources, screen returns to the last TV channel.

MODE

Selects the remote operating mode: TV, DVD, VCR, AUDIO,
CABLE, or STB. Select a mode other than TV, for the remote
to operate an external device.

INPUT (Refer to p.14)
External input modes rotate in regular sequence: Antenna,
Cable, AV1-2, Component 1-2, RGB-DTV (or RGB-PC),
HDMI/DVI).

(AV1, AV2,Component 1-2 input sources are linked

automatically, Only if these are connected)

EXIT

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

TIMER

Lets you select the amount of time before your TV turns
itself off automatically.

CC

Select a closed caption: Off, CC1~4, Text1~4.

MENU

Brings up the main menu to the screen.

GUIDE

Shows program schedule.

RATIO

Changes the aspect ratio.

THUMBSTICK (Up/Down/Left/Right/ENTER)

Allows you to navigate the on-screen menus and adjust the
system settings to your preference.

INFO

When you watch the TV, information displays on top of the
screen. Not available in Component 1-2, RGB and HDMI/DVI
mode.

DESCRIPTION OF CONTROLS

- 7 -

EZ PIC

Selects a factory preset picture mode depending on the view­ing environment.

EZ SOUND

Selects the sound appropriate for the program's character.

SAP

Selects MTS sound: Mono, Stereo, and SAP in analog mode.
Change the audio language in DTV mode.

FREEZE

Freezes the currently-viewed picture.

ADJUST

Adjusts screen position, size, and phase in PC mode.

APM

Concurrently, compare with the Daylight, Normal, Night Time
and Custom on the screen.

FAV

Use to scroll the Favorite channels.

MUTE

Switches the sound on or off.

CHANNEL UP/DOWN

Selects available channels found with EZ scan and Manual scan.

PAGE UP/DOWN

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

VOLUME UP/DOWN

Increases/decreases the sound level.

VOL

CH

POWER

1 2 3

4 5 6

7 8

0

9

MENU

MUTE

FAV

DAY -

GUIDE

DAY+

RATIO

VCR

TV

DVD

ENTER

APM

ADJUST

SAP

EZ SOUND

EZ PIC

FREEZE

FLASHBK

PAGE

PAGE

EXIT

TIMER

CC

INFO

AUDIO

CABLE

STB

MODE

TV INPUT

INPUT

— (DASH)

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

NUMBER BUTTONS

FLASHBK

Returns to the last channel viewed.

VCR/DVD/DVHS/Camcorder BUTTONS

Control some video cassette recorders or DVD players
("RECORD" button is not available for DVD player).

DAY + / DAY-

Moves forward or backward in 24 hour increments.

DESCRIPTION OF CONTROLS

- 8 -

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

MODEL

Television System

Program Coverage

External Antenna Impedance

Operating Temperature Range

Operating Humidity Range

Resolution

42PC3D/3DV-UD 50PC3D-UD

NTSC-M, ATSC, 64 & 256 QAM

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

75 Ω

32 ~ 104°F (0 ~ 40°C)

Less than 80%

42PC3D-UD: 1024 x 768 (Dot)
42PC3DV-UD: 852 x 480 (Dot)

1366 x 768 (Dot)

SPECIFICATIONS

1. Application Object

These instructions are applied to all of the PDP TV, PA-51D.

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.

1) After receiving 100% white pattern, the receiver must be
operated prior to adjustment. (Or 8. White Pattern
condition in EZ - Adjust)

2) Enter into White Pattern

- Press POWER ON Key on the Service Remote

Control (S R/C)

- Enter the Ez - Adjust by pressing ADJ Key on the

Service Remote Control (S R/C).

- Select the 7. White Pattern using CH +/- Key and

press the Enter(

Y) Key.

Display the 100% Full White Pattern.

[ Set is activated HEAT-RUN without signal generator in

this mode.

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.

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. POWER PCB Assy Voltage
Adjustment

(Va, Vs Voltage Adjustment)

4-1. Test Equipment :D.M.M 1EA
4-2. Connection Diagram for Measuring

Refer to <Fig. 2>.

4-3. Adjustment

(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 RV601 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 -

ADJUSTMENT INSTRUCTIONS

PC

VSC

B/D

<Fig. 1> Connection Diagram of EPLD Download

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. 2> Connection Diagram of Power Adjustment for

Measuring (Power Board)

- 10 -

ADJUSTMENT INSTRUCTIONS

5. EDID(The Extended Display

Identification Data)/DDC
(Display Data Channel) Download

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

5-1. HDMI EDID Data Input

(1) Required Test Equipment

1) Jig for adjusting PC, 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)

5-2. EDID DATA for PA-51D

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

EDID table =

0 1 2 3 4 5 6 7 8 9 A B C D E F

______________________________________________
00 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 0F 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 | 09 48 4C 2F CE 00 31 40 45 40 61 40 01 01 01 01
30 | 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88
40 | 36 00 00 D0 52 00 00 18 00 00 00 FD 00 38 55 1F
50 | 3C 08 00 0A 20 20 20 20 20 20 00 00 00 FC 00 4C
60 | 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FC
70 | 00 50 44 50 0A 20 20 20 20 20 20 20 20 20 01 8F
80 | 02 03 13 F1 44 84 05 03 02 23 15 07 50 65 03 0C
90 | 00 10 00 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C4
A0 | 8E 21 00 00 1E 01 1D 80 18 71 1C 16 20 58 2C 25
B0 | 00 C4 8E 21 00 00 9E 8C 0A D0 8A 20 E0 2D 10 10
C0 | 3E 96 00 C4 8E 21 00 00 18 8C 0A D0 8A 20 E0 2D
D0 | 10 10 3E 96 00 13 8E 21 00 00 18 00 00 00 00 00
E0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ED

:EDID DATA for RGB

EDID table =

0 1 2 3 4 5 6 7 8 9 A B C D E F

__________________________________________________

0 | 00 FF FF FF FF FF FF 00 1E 6D 01 01 01 01 01 01

10 | 16 0F 01 03 68 6E 3E 96 0A 30 31 A8 55 40 AC 25

20 | 0D 47 48 AF CE 00 31 4F 45 4F 61 4F 01 01 01 01
30 | 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88
40 | 36 00 4C 6C 42 00 00 18 00 00 00 FD 00 38 4B 1E
50 | 3D 08 00 0A 20 20 20 20 20 20 00 00 00 FC 00 4C
60 | 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 16

6. MST9883A-Set Adjustment

6-1. Synopsis

MST9883A-Set adjustment to set the black level and the Gain
of optimum with an automatic movement from the analog =>
digital converter.

6-2. Test Equipment

Service R/C, MSPG925FA Pattern Generator
(720P The Horizontal 100% Color Bar Pattern output will be
possible and the output level will accurately have to be
revised with 0.7±0.1Vp-p)

PDP TV SET

(or Digital Board)

<Fig. 3>

<Fig. 4> Adjustment Mode

<Fig. 5> Adjustment Pattern: HOzTV31Bar Pattern

(720P/60Hz: Format No. 217)

(480i/60Hz: Format No. 209)

- 11 -

ADJUSTMENT INSTRUCTIONS

6-3. Adjustment

(1) Select Component as the input with 100% Horizontal

Color Bar Pattern(HozTV31Bar) in 720p Mode and select
‘Normal’ on screen.

(2) After receiving signal for at least 1 second, press the ADJ

Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘1. MST9883A-720p Set’.
Pressing the Enter Key to adjust with automatic movement.

(3) When the adjustment is over, 'MST9883A Component

Success’ is displayed. If the adjustment has errors,
'MST9883A Configuration Error’ is displayed.

(4) After the Component MST9883A adjustment is over,

convert the RGB-DTV Mode and display Pattern.
When the adjustment is over, 'MST9883A RGB_DTV
Success’ is displayed.

(5) Select Component as the input with 100% Horizontal Color

Bar Pattern(HozTV31Bar) in 480i Mode.

(6) After receiving signal for at least 1 second, press the ADJ

Key on the Service R/C to enter the ‘Ez - Adjust’ and select
the ‘3. MST9883A-480i Set’.
Pressing the Enter Key to adjust with automatic movement.

(7) When the adjustment is over, 'MST9883A Component

Success’ is displayed. If the adjustment has errors,
'MST9883A Configuration Error’ is displayed.

[ MST9883 480i adjustment is apply the only Component Mode.

(8) Readjust after confirming the case Pattern or adjustment

condition where the adjustment had errors.

(9) After adjustment is complete, exit the adjustment mode by

pressing the ADJ KEY.

7. Adjustment of White Balance

7-1. Required Equipment

(1) Color analyzer (CA-100 or similar product)
(2) Automatic adjustor (with automatic adjustment hour

necessity and the RS-232C communication being possible)

(3) Pattern Generator(MSPG-925FA): DVI Output

7-2. Connection Diagram of Equipment

for Measuring (Automatic Adjustment)

[[

RS-232C Command (Automatic Adjustment)

7-3. Adjustment of White Balance

O

Operate the Zero-calibration of the CA-100, then attach

sensor to PDP module surface when you adjust.

O

Manual adjustment is also possible by the following sequence.

(1) Enter ‘Ez - Adjust’ by pressing ADJ KEY on the Service

Remote Control.

(2) Select "8. WHITE PATTERN" using CH +/- Key and HEAT

RUN at least 30 minutes by pressing the ENTER Key.

(3) Receive the Window pattern signal from Digital Pattern

Generator. (AV Input: connect the ‘HDMI’)

(4) After attaching sensor to center of screen, select ‘5. White-

Balance’ of ‘Ez - Adjust’ by pressing the ADJ KEY on the
Service R/C. Then enter adjustment mode by pressing the
Right KEY (

G

) .

(5) Adjust the Hight Light using R Gain/G Gain(Cool).

Adjust the Hight Light using G Gain/B Gain(Medium).
Adjust the Hight Light using G Gain/B Gain(Warm).

(6) Adjust using Volume +/- KEY.

After adjustment is complete, exit the adjustment mode by
pressing the ADJ KEY.

High Level: 216gray

[Cool]

X; 0.278±0.002 Y; 0.279±0.002
Color temperature: 11000°K±1000°K

[Medium]

X; 0.287±0.003 Y; 0.289±0.003
Color temperature: 9300°K±1000°K

[Warm]

X; 0.315±0.002 Y; 0.316±0.002
Color temperature: 6500°K±1000°K

R Gain
G Gain

B Gain

R Cut
G Cut
B Cut

Jg
Jh

Ji

Cool

Ja
Jb
Jc

Med

RS-232C COMMAND CENTER(DEFAULT)

Jd
Je

Jf

00
00
00

ff
ff

ff
7f
7f
7f

Warm

Min Max

b8
bd
c0
40
40
40

Cool

c0
b8
b1
40
40
40

Med

c0
96
54
40
40
40

Warm