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USA : http//www.lgservice.com
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PLASMA TV
SERVICE MANUAL
CHASSIS : AF-05PA

MODEL : 42PX7DC 42PX7DC-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




INPUT ENTER
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




- 2 -
TABLE OF CONTENTS

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


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


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


BLOCK DIAGRAM...............................................................15


EXPLODED VIEW...............................................................18


EXPLODED VIEW PARTS LIST .........................................19


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


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


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




- 3 -
DESCRIPTION OF CONTROLS

Controls

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



Front Panel Controls




INPUT ENTER




INPUT MENU ENTER VOL CH




POWER Button ENTER Button CHANNEL (E, D) Buttons

INPUT Button
Remote Control Sensor
VOLUME (F,G) Buttons
MENU Button




- 4 -
DESCRIPTION OF CONTROLS


Connection Options

Back Connection Panel



HDMI IN 2
M.P.I.

2 ANTENNA IN
ANTENNA M.P.I.
S-VIDEO IN




AUDIO R
AUDIO IN




L /MONO
VIDEO
ANTENNA IN VIDEO IN




AV IN 1
DIGITAL AUDIO OUT COMPONENT IN
OPTICAL




HDMI1/DVI IN
SERVICE
ONLY
RJP INTERFACE


INTERFACE 1 SERVICE ONLY
OPTICAL




AUDIO IN(RGB/DVI) SPEAKER OUT(8 )



RESET UPDATE AC IN




UPDATE AC IN
AUDIO IN
(RGB/DVI) RESET
RGB IN SPEAKER
(PC/DTV) OUT

REMOTE CONTROL OUT




- 5 -
DESCRIPTION OF CONTROLS


Remote Control Key Functions
- When using the remote control, aim it at the remote control sensor on the TV.




MODE INDICATOR LIGHTS
Select the remote oper ting mode: TV, Show active remote mode every time
VCR, Cable, DVD and Satellite. TV VCR CABLE DVD HDSTB
any button is pressed.

MODE INFO POWER
INPUT
External input modes rotate in regular
sequence: Tuner, AV1, AV2, Component, INPUT MULTIMEDIA EZ PIC INFO
RGB1, RGB2, HDMI1/DVIand HDMI2 Display information t the top of the screen.
input sources. ADJUST SIGNAL EZ SOUND
(AV1, AV2, Component input sources
are linked automatically, only if these are
connected )
1 2 3
EZ PIC
NUMBER KEYPAD 4 5 6 Selects a factory preset picture mode
For direct channel selection and depending on the viewing environment.
programming functions. 7 8 9
0 FLASHBK
FAV
MUTE
MUTE FAV Scrolls the Favorite channels.
Switches the sound on or off.
+
SAP TIMER
VOL CH TIMER
Lets you select the amount of time
VOLUME UP/DOWN PIP PIPCH- PIPCH+ SWAP before your TV turns itself off automati-
Increases/decreases the sound cally.
level.

RATIO CC FREEZE PIP INPUT PIP INPUT
RATIO
Changes the screen format or aspect Selects the input source for the sub
ratio. picture.




ENTER
When in the menu system and other
MENU on-screen displays, selects highlighted
Brings up the main menu to the MENU EXIT
options.
screen.

PLAY PAUSE STOP RECORD
EXIT
SKIP Clears all on-screen displays and returns
REW FF to TV viewing from any menu.
Playing CDs: Selects songs.
Playing DVDs: Selects movie chapters.
SKIP




- 6 -
DESCRIPTION OF CONTROLS

Remote Control Key Functions


MULTIMEDIA
Selects: RGB1-2,HDMI1/DVI, HDMI2 and
Component input sources. POWER
TV VCR CABLE DVD HDSTB Turns your TV or any other programmed
equipment on or off, depending on mode.
MODE INFO POWER


INPUT MULTIMEDIA EZ PIC
EZ SOUND
ADJUST
Selects the sound appropriate for the pro-
Adjusts screen position, size, and ADJUST SIGNAL EZ SOUND gram's character.
phase in PC mode.


1 2 3 FLASHBK
SIGNAL Tunes to the last channel viewed.
Displays the digital signal strength. 4 5 6
7 8 9
CHANNEL UP/DOWN
Scrolls through available channels in
0 FLASHBK
EZ Scan memory.
SAP MUTE FAV
Selects MTS sound: Mono, Stereo, and +
SAP in Analog mode. Change the audio
language in DTV mode. SAP TIMER SWAP
VOL CH Exchanges the main/sub images in
PIP/Twin picture mode.
PIP PIPCH- PIPCH+ SWAP
PIP
Toggles between PIP and Twin picture
mode.
PIPCH+
CC FREEZE PIP INPUT Changes to next higher PIP channel.
RATIO
PIPCH-
Changes to next lower PIP channel

FREEZE
Freezes the currently-viewed picture.
CC Main picture is frozen in PIP/Twin picture
Selects a closed caption mode for dis- mode.
playing captioning information if avail-
able on program. MENU EXIT



PLAY PAUSE STOP RECORD RECORD, PAUSE, REW, FFWD,
THUMBSTICK PLAY, STOP
Allows you to navigate the on-screen Control the functions on your VCR.
menus and to adjust the system settings REW FF
and preferences, by moving to an option
D
withF E G and selecting the highlighted SKIP
option with .




- 7 -
SPECIFICATIONS


MODELS
42PX7DC
( 42PX7DC-UA )

Width (inches / mm) 46.7 / 1186

Height (inches / mm) 27.6 / 654.7

Depth (inches / mm) 25.8 / 119.5

Weight (pounds / kg) 58.9 / 26.7

Resolution 1024x768 (Dot)

Power requirement AC100-240V~ 50/60Hz

Television System NTSC-M, ATSC, 64 & 256 QAM

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

External Antenna Impedance 75

Operating Temperature Range 32 ~ 104