LG 50PC3D Schematic

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS :PA-63E

MODEL : 50PC3D 50PC3D-UE

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

PRINTED CIRCUIT BOARDS.............................................16

BLOCK DIAGRAM...............................................................19

EXPLODED VIEW...............................................................20

EXPLODED VIEW PARTS LIST.........................................21

REPLACEMENT PARTS LIST............................................22

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

TABLE OF CONTENTS

- 4 -

Controls (Model Name:

Controls (Model Name:

42PC3DU/3DVU/50PC3DU/60PC1D)

42PC3DU/3DVU/50PC3DU/60PC1D)

- This is a simplified representation of front panel.

- This picture shown below may be somewhat different from your TV.

POWER
Button

INPUT
Button

ENTER
Button

VOLUME

(

FF,GG

)Buttons

CHANNEL

(

EE,DD

)Buttons

Power Standby Indicator
Illuminates red in stand-

by mode.
Illuminates green when
the set is switched on.

MENU
Button

ENTERENTER

Remote
Control Sensor

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

42/50PC3DU/42PC3DVU

60PC1D

DESCRIPTION OF CONTROLS

- 5 -

Connection Options

Connection Options

(Model Name: 42PC3DU/3DVU/50PC3DU/60PC1D)

(Model Name: 42PC3DU/3DVU/50PC3DU/60PC1D)

- This picture shown below may be somewhat different from your TV.

/

MONO

VIDEOVIDEO

AUDIOAUDIO

VIDEOVIDEO

AUDIOAUDIO

MONO

( ( ))

S-VIDEOS-VIDEO

AV IN 1AV IN 1

AV OUTAV OUT

ANTENNA/

CABLE IN

(CONTROL & SERVICE)

RGB IN

COMPONENT INCOMPONENT IN

OUT

O

PTICAL

1(DVI)

SERVICE

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.

COMPONENT IN
Connect a component video/audio device to

these jacks.
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.

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

DIGITAL AUDIO OUT
Connect digital audio from various types of

equipment.
Note: In standby mode, these ports do not work.

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.
RGB IN (PC)

Connect the monitor output from a PC to the
appropriate input port.

Remote Control Port
Connect your wired remote control.
AUDIO IN (RGB/DVI)
Connect the monitor output from a PC to the

appropriate input port.

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

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

1

2

4

1

7

8

9

10

2

3

4

5

5

6

7

8

3

9

10

6

DESCRIPTION OF CONTROLS

- 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

BRIGHT +

VCR

TV

DVD

ENTER

ADJUST

SAP

EZ SOUND

EZ PIC

CC

FLASHBK

EXIT

TIMER

RATIO

INFO

AUDIO

CABLE

STB

MODE

TV INPUT

INPUT

BRIGHT -

TV INPUT

Rotates the input mode between Antenna and Cable. In AV1­2, Component 1-2, RGB-DTV (or RGB-PC), HDMI1/DVI, and
HDMI2 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

External input modes rotate in regular sequence: TV, AV1-2,
Component 1-2, RGB-PC, HDMI1/DVI or HDMI2.

(AV 1-2, Component 1-2, RGB-PC , HDMI1/DVI or HDMI2
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.

RATIO

Changes the aspect ratio.

MENU

Brings up the main menu to the screen.

BRIGHT + / -

- Adjust brightness on screen.

- It turns to the default settings brightness by changing mode
source.

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, HDMI1/DVI
and HDMI2 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.

CC

(*In DTV/CADTV mode )

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

ADJUST

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

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.

VOLUME UP/DOWN

Increases/decreases the sound level.

VOL

CH

POWER

1 2 3

4 5 6

7 8

0

9

MENU

MUTE

FAV

BRIGHT +

VCR

TV

DVD

ENTER

ADJUST

SAP

EZ SOUND

EZ PIC

CC

FLASHBK

EXIT

TIMER

RATIO

INFO

AUDIO

CABLE

STB

MODE

TV INPUT

INPUT

BRIGHT -

— (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).

DESCRIPTION OF CONTROLS

- 8 -

60PC1D

(60PC1D-UE)

AC100-240V ~ 50/60Hz

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%

-4 ~ 140°F (-20 ~ 60°C)
Less than 85%

60.8 x 40.8 x 16.0 inches

1544.0 x 1035.5 x 408.2 mm

60.8 x 38.4 x 4.7 inches

1544.0 x 977.0 x 119.2 mm
163 pounds / 74.0 kg

137.3 pounds / 62.26 kg

Dimensions
(Width x Height x Depth)

Weight

with stand

without stand

with stand
without stand

42PC3DU

(42PC3DU-UE)

44.4 x 29.5x 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 x 103.7 mm

64.4 pounds / 29.2 kg

55.8 pounds / 25.3 kg

Dimensions
(Width x Height x Depth)

Weight

with stand

without stand

with stand
without stand

42PC3DVU

(42PC3DVU-UE)

44.4 x 29.5x 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 x 103.7 mm

62.6 pounds / 28.4 kg

54.0 pounds / 24.5 kg

Dimensions
(Width x Height x Depth)

Weight

with stand

without stand

with stand
without stand

50PC3DU

(50PC3DU-UE)

51.3 x 34.3 x 14.0 inches

1302.6 x 872.0 x 355.8 mm

51.3 x 31.9 x 4.2 inches

1302.6 x 810.0 x 107.7 mm

114.4 pounds / 51.9 kg

95.0 pounds / 43.1 kg

Dimensions
(Width x Height x Depth)

Weight

with stand

without stand

with stand
without stand

Power requirement
Television System
Program Coverage

External Antenna Impedance

Operating Temperature
Operating Humidity
Storage Temperature
Storage Humidity

Environmental
condition

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

SPECIFICATIONS

- 9 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructions are applied to all of the PDP TV, PA63E.

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. MICOM Download(Option)

3-1. Required Test Equipment

(1) JIG-LEVER TYPE for adjusting: 1EA
(2) PC & MONITOR: 2EA
(3) BOARD for INTERFACE: IIC & ISP BOARD: 2EA
(4) 15P D-SUB CABLE: 2EA
(5) Using the 12/15 line of D-SUB 15P

12-SDA/15-SCL

3-2. JIG Connection

3-3. Establishment Program

(1) Establish LGE Monitor Tools v1.1
(2) The program work and it is opened program window as

seen below.

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.

connection

to PC

connection

to PC

- 10 -

ADJUSTMENT INSTRUCTIONS

(3) Click the first icon shown in fig.9. The window seen in

fig.10 should appear.

3-4. Set Method

(1) MCU Select: MTV512M64
(2) Option

R/W Option: Auto Write(Verity)
Jig Option: Myson
Transmit Speed: Medium

(3) Check: Just do it with blank micom.
(4) PORT

Chose Parallel Port (normal LPT1)
Attention: You must chose EPP when select Rom BIAS at
LPT

3-5. Download Method

(1) Click the Load File.

(2) Locate and select the correct file from your computer.

(*.hex).

(3) Click the Send.

(4) When you see (ISP COMPLETE) the download is

complete.

- 11 -

ADJUSTMENT INSTRUCTIONS

4. ADC-Set Adjustment

4-1. Synopsis

ADC-Set adjustment to set the black level and the Gain to
optimum.

4-2. Test Equipment

Service R/C, 801GF(802V, 802F, 802R) or MSPG925FA
Pattern Generator
(480i/1080i The Horizontal 100% Color Bar Pattern adjust to
within 0.7±0.1Vp-p)

4-3. Adjustment

(1) Select Component1 as the input with 100% Horizontal

Color Bar Pattern(HozTV31Bar) in 480i Mode

(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 ‘2. ADC 480i Comp1’.
Pressing the Enter Key to adjust automatically.

(3) When the adjustment is over, 'MST3361 Component

Success’ is displayed. If the adjustment has errors,
'MST3361 Configuration Error’ is displayed.

(4) Select Component1 as the input with 100% Horizontal

Color Bar Pattern(HozTV31Bar) in 1080i Mode.

(5) 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. ADC 1080i Comp1/RGB’.
Pressing the Enter Key to adjust automatically.

(6) When the adjustment is over, 'MST3361 Component

Success’ is displayed. If the adjustment has errors,
'MST3361 Configuration Error’ is displayed.

(7) After the Component MST3361 adjustment is over, convert

the RGB-DTV Mode and display Pattern.
When the adjustment is over, 'MST3361 RGB_DTV
Success’ is displayed.

(8) Readjust after confirming the case Pattern or adjustment

condition where the adjustment errors.

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

pressing the ADJ KEY.

<Adjustment Mode>

<Adjustment Pattern: 480i/1080i 60Hz HozTV31Bar Pattern>

- 12 -

ADJUSTMENT INSTRUCTIONS

5. POWER PCB Assy Voltage
Adjustment

(Va, Vs Voltage Adjustment)

5-1. Test Equipment :D.M.M 1EA
5-2. Connection Diagram for Measuring

Refer to Fig 1.

5-3. Adjustment

(1) Va Adjustment

1) Connect + terminal of D.M.M to Va pin of P812(50”:
P805) and connect – terminal to GND pin of P812(50”:
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 P812(50”:
P805) and connect – terminal to GND pin of P812(50”:
P805).

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

6. EDID(The Extended Display

Identification Data)/DDC
(Display Data Channel) Download

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

6-1. 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)

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.)

11 1

VsADJ

VR951

VaADJ

VR901

3.3VADJ

VR221

T8
01

T9
01

T1
12

T5
01

L6
01

5V

GND

Va

GND

GND

NC

Vs

Vs

P811

11 1

VsADJ

VR951

VsADJ

VR951

VaADJ

VR901

VaADJ

VR901

3.3VADJ

VR221

T8
01

T9
01

T1
12

T5
01

L6
01

5V

GND

Va

GND

GND

NC

Vs

Vs

P811

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

Measuring (Power Board): 42” XGA

VsADJ

VR951

5V

GND

Va

GND

GND

NC

Vs

Vs

P811

111

VaADJ

VR901

3.3VADJ

VR221

T8
01

T9

01
L8
51

T5
01

T1
12

L6
01

VsADJ

VR951

5V

GND

Va

GND

GND

NC

Vs

Vs

P811

111

VaADJ

VR901

VaADJ

VR901

3.3VADJ

VR221

T8
01

T9

01
L8
51

T5
01

T1
12

L6
01

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

Measuring (Power Board): 50”

PDP TV SET

(or Digital Board)

<Fig. 2>