LG 42PX3DLV Service Manual

PLASMA TV

SERVICE MANUAL

CAUTION

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

CHASSIS : AF-044C

MODEL : 42PX3DBV 42PX3DBV-UC

MODEL : 42PX3DLV 42PX3DLV-UC

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

: http//lgservice.com/techsup.html

PR

VOL

MENUTV/AV OK

- 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...............................................................14

EXPLODED VIEW...............................................................16

EXPLODED VIEW PARTS LIST.........................................17

REPLACEMENT PARTS LIST............................................18

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

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

TABLE OF CONTENTS

- 4 -

Controls

Controls

- This is a simplified representation of front panel.
Image shown may be somewhat different from your TV.

Front Panel Controls

Front Panel Controls

MENU

VOL

CH

TV/VIDEO

ENTER

POWER Button

Remote Control Sensor

VOLUME (

FF , GG

) Buttons

Power Standby Indicator

Illuminates red in standby mode, Illuminates
green when the TV is turned on.

CHANNEL (EE, DD) Buttons

MENU Button

TV/VIDEO Button

ENTER Button

DESCRIPTION OF CONTROLS

- 5 -

Connection Options

Connection Options

Back Connection Panel

Back Connection Panel

Antenna Inputs

Connect cable or antenna signals to the

TV, either directly or through your cable

box.

DVI Input/Audio Input/RGB
Input

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

Digital Audio (DVI: Digital Visual

Interface/Component1) Input/

Digital Audio Output

Connect digital audio from various types

of equipment. Note: In standby mode,

these ports will not work.

Audio/Video Input 1

Connect audio/video out-

put from an external

device to these jacks.

DVD/DTV Input (Component
1-2)

Connect a component
video/audio device to these
jacks.

Remote Control
Port

Connect your wired
remote control here.

S-Video Input

Connect S-Video out from an
S-VIDEO device to the S­VIDEO input.

Power Cord Socket

This TV operates on an AC power. The voltage is indi-

cated on the Specifications page. Never attempt to oper-

ate the TV on DC power.

S-VIDEO Input

A connection available to provide better
picture quality than the video input.

VIDEO Input

Connects the video signal from a video
device.

AUDIO Input

Use to connect to hear stereo sound
from an external device.

RS-232C INPUT
(CONTROL/SERVICE) PORT

Connect to the RS-232C port
on a PC.

DESCRIPTION OF CONTROLS

A/V 2

S-VIDEO VIDEO

L / MONO

AUDIO

R

RS-232C INPUT

(CONTROL/SERVICE)

REMOTE

CONTROL

DIGITAL AUDIO

(OPTICAL)

COMPONENT1
INPUT

OUTPUT

DVI INPUT

(PC/DTV INPUT)

AUDIO INPUT

DVI

INPUT

COMPONENT 2

RGB INPUT

(PC/DTV INPUT)

R L

AUDIO INPUT

COMPONENT 1

VIDEO INPUT

DVD
/DTV

INPUT

A/V

R L

AUDIO

(MONO)

VIDEO

INPUT 1

S-VIDEO

Antenna
Analog/DTV

AC INPUT

- 6 -

Remote Control Key Functions

Remote Control Key Functions

MODE

FLASHBK

FREEZE

TV/VIDEO

SAP

EXIT

TIMER

CC

XD

COMP/RGB/DVI

INFO

SURF

COMP/RGB/DVI

Selects: Component 1-2, RGB-DTV (or

RGB-PC), DVI-DTV (or DVI-PC) input

sources.

MUTE

Switches the sound on or off.

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.

FLASHBK

Tunes to the recent channels.

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.

MENU

Brings up the main menu to the screen.

EZ PIC

Selects a factory preset picture mode

depending on the viewing environment.

FREEZE

Freezes the currently-viewed picture.
Main picture is frozen.

TV/VIDEO

External input modes rotate in regular
sequence: Antenna, Cable, Video, Front
Video, Component 1-2 and RGB-DTV (or
RGB-PC) input sources.
(Video, Front Video, Component 1-2 input
sources are linked automatically, only if
these are connected )

RATIO

Changes the aspect ratio.

SURF

Scrolls the Favorite channels.

SAP

Selects MTS sound: Mono, Stereo, and

SAP in Analog mode. Change the audio

language in DTV mode.

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

DESCRIPTION OF CONTROLS

- 7 -

MODE

FLASHBK

FREEZE

TV/VIDEO

SAP

EXIT

TIMER

CC

XD

COMP/RGB/DVI

INFO

SURF

LIGHT

Illuminates the remote control

buttons of selected mode.

NUMBER buttons

VCR/DVD BUTTONS

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

POWER

Turns your TV or any other programmed

equipment on or off, depending on mode.

CC

Select a closed caption:

Off, CC1~4, Text1~4.

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

Allows you to navigate the on-screen menus

and adjust the system settings to your pref-

erence.

CHANNEL UP/DOWN

Selects available channels found with EZ
scan.

PAGE UP/PAGE DOWN

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

EZ SOUND

Selects the sound appropriate for the pro-

gram's character.

XD

Switches the XD function on or off.

VOLUME UP/DOWN

Increases/decreases the sound level.

INFO

When you watch the TV, information dis-

plays on top of the screen. Not available in

Component 1-2 and RGB mode.

ADJUST

Adjusts screen position, size, and phase in

PC mode.

DESCRIPTION OF CONTROLS

- 8 -

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

MODEL

AC100-240V ~ 50/60Hz

NTSC-M, ATSC, 64 & 256 QAM

VHF 2 ~ 13, UHF 14 ~ 69, CATV 1 ~ 125, CADTV 1 ~ 135. DTV 2 ~ 69

75 Ω

32 ~ 104°F (0 ~ 40°C)

Less than 80%

47.6 / 1210

27.6 / 701

11.6 / 295

66.1 / 30

852 x 480 (Dot)

Width (inches / mm)

Height (inches / mm)

Depth (inches / mm)

Weight (pounds / kg)

Resolution

Power requirement

Television System

Program Coverage
External Antenna Impedance
Operating Temperature Range

Operating Humidity Range

42PX3DBV-UC/42PX3DLV-UC

SPECIFICATIONS

1. Application Object

These instructions are applied to all of the PDP TV, AF-044C.

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 instrument.
(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 5. White Pattern
condition in EZ - Adjust)

2) Enter into White Pattern

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

Remote Control (S R/C).

- Select the 5. 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.

3. EPLD Download

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

4. SUB MICOM Download

4-1. Select the MICOM Model

Select the MICOM Model.(M16C/6H Group --> M306H3FC)

[ After setting, you need not set, again.

4-2. JIG Connection

Connection to the Micom Port on the TV Board.
(Spot of the red line(an arrow)is connected to the port 1.)

- 9 -

ADJUSTMENT INSTRUCTIONS

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.

PC

VSC

B/D

<Fig 1> Connection Diagram of EPLD Download

<MICOM JIG>

Connection
the Computer