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USA : http//www.lgservice.com
: http//lgservice.com/techsup.html
PLASMA TV
SERVICE MANUAL
CHASSIS : AF-044C
MODEL : 42PX3DBV 42PX3DBV-UC
MODEL : 42PX3DLV 42PX3DLV-UC
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
TV/AV MENU OK VOL PR
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
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 Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
An lsolation Transformer should always be used during Do not use a line Isolation Transformer during this check.
the servicing of a receiver whose chassis is not isolated from Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
the AC power line. Use a transformer of adequate power rating between a known good earth ground (Water Pipe, Conduit, etc.)
as this protects the technician from accidents resulting in and the exposed metallic parts.
personal injury from electrical shocks. Measure the AC voltage across the resistor using AC
voltmeter with 1000 ohms/volt or more sensitivity.
It will also protect the receiver and it's components from being Reverse plug the AC cord into the AC outlet and repeat AC
damaged by accidental shorts of the circuitary that may be voltage measurements for each esposed metallic part. Any
inadvertently introduced during the service operation. voltage measured must not exceed 0.75 volt RMS which is
corresponds to 0.5mA.
If any fuse (or Fusible Resistor) in this monitor is blown, replace In case any measurement is out of the limits sepcified, there is
it with the same specified type. possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
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 Hot Check circuit
AC Volt-meter
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. Good Earth Ground
Place the AC switch in the on positioin, connect one lead of such as WATER PIPE,
ohm-meter to the AC plug prongs tied together and touch other To Instrument's CONDUIT etc.
ohm-meter lead in turn to each exposed metallic parts such as 0.15uF
exposed
antenna terminals, phone jacks, etc. METALLIC PARTS
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 1.5 Kohm/10W
reading must be infinite.
An-other abnormality exists that must be corrected before the
receiver is returned to the customer.
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
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TABLE OF CONTENTS
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 .................................................
- 3 -
DESCRIPTION OF CONTROLS
Controls
- This is a simplified representation of front panel.
Image shown may be somewhat different from your TV.
Front Panel Controls
TV/VIDEO MENU ENTER VOL CH
CHANNEL (E, D) Buttons
VOLUME (F , G) Buttons
Remote Control Sensor
ENTER Button
MENU Button
TV/VIDEO Button
POWER Button
Power Standby Indicator
Illuminates red in standby mode, Illuminates
green when the TV is turned on.
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
Back Connection Panel
S-VIDEO Input
A/V 2 A connection available to provide better
picture quality than the video input.
S-VIDEO
VIDEO Input
VIDEO
Connects the video signal from a video
device.
L / MONO
AUDIO Input
R AUDIO
Use to connect to hear stereo sound
from an external device.
DVI Input/Audio Input/RGB S-Video Input
DVD/DTV Input (Component Connect S-Video out from an
Input
1-2) S-VIDEO device to the S-
Connect the monitor output con-
Connect a component VIDEO input.
Remote Control nector from a PC to the appro-
video/audio device to these
Port priate input port.
jacks.
Connect your wired
remote control here.
DIGITAL AUDIO
(OPTICAL)
COMPONENT 2 DVD
/DTV
INPUT A/V
COMPONENT 1
INPUT 1 (MONO) Antenna
REMOTE DVI INPUT RGB INPUT R L Analog/DTV
RS-232C INPUT DVI COMPONENT1 R L VIDEO S-VIDEO
(CONTROL/SERVICE) CONTROL INPUT INPUT OUTPUT (PC/DTV INPUT) AUDIO INPUT (PC/DTV INPUT) AC INPUT
AUDIO INPUT VIDEO INPUT AUDIO
Digital Audio (DVI: Digital Visual
Antenna Inputs
Interface/Component1) Input/ Audio/Video Input 1
Connect cable or antenna signals to the
Digital Audio Output Connect audio/video out-
TV, either directly or through your cable
Connect digital audio from various types put from an external
box.
of equipment. Note: In standby mode, device to these jacks.
these ports will not work.
RS-232C INPUT Power Cord Socket
(CONTROL/SERVICE) PORT This TV operates on an AC power. The voltage is indi-
Connect to the RS-232C port cated on the Specifications page. Never attempt to oper-
on a PC. ate the TV on DC power.
- 5 -
DESCRIPTION OF CONTROLS
Remote Control Key Functions
- When using the remote control, aim it at the remote control sensor on the TV.
COMP/RGB/DVI
Selects: Component 1-2, RGB-DTV (or
RGB-PC), DVI-DTV (or DVI-PC) input
sources. COMP/RGB/DVI TV/VIDEO
TV/VIDEO
External input modes rotate in regular
sequence: Antenna, Cable, Video, Front
MODE Video, Component 1-2 and RGB-DTV (or
MODE RGB-PC) input sources.
Selects the remote operating mode: TV, (Video, Front Video, Component 1-2 input
DVD, VCR, AUDIO, CABLE or STB. Select sources are linked automatically, only if
a mode other than TV, for the remote to these are connected )
operate an external device.
INFO
MENU
RATIO
Brings up the main menu to the screen.
Changes the aspect ratio.
EXIT
SAP CC
EXIT TIMER TIMER
Clears all on-screen displays and returns to Lets you select the amount of time before
TV viewing from any menu. your TV turns itself off automatically.
SURF
SAP
Selects MTS sound: Mono, Stereo, and SURF
SAP in Analog mode. Change the audio Scrolls the Favorite channels.
language in DTV mode.
MUTE FLASHBK
FLASHBK
Switches the sound on or off. Tunes to the recent channels.
XD FREEZE
EZ PIC FREEZE
Selects a factory preset picture mode Freezes the currently-viewed picture.
depending on the viewing environment. Main picture is frozen.
- 6 -
DESCRIPTION OF CONTROLS
POWER
Turns your TV or any other programmed
equipment on or off, depending on mode. COMP/RGB/DVI TV/VIDEO VCR/DVD BUTTONS