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CANADA : http//biz.lgservice.com
USA : http//www.lgservice.com
: http//lgservice.com/techsup.html
PLASMA TV
SERVICE MANUAL
CHASSIS : AF-05FA
MODEL : 50PX4DR 50PX4DR-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
POWER TV GUIDE
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
PRINTED CIRCUIT BOARDS .............................................18
BLOCK DIAGRAM...............................................................23
EXPLODED VIEW...............................................................26
EXPLODED VIEW PARTS LIST .........................................27
REPLACEMENT PARTS LIST ............................................28
SCHEMATIC DIAGRAM..........................................................
- 3 -
DESCRIPTION OF CONTROLS
Controls
W This is a front panel of 50PX4DR series TVs.
- This is a simplified representation of front panel.
Here shown may be somewhat different from your TV.
Front Panel Controls
INDEX
Switches
LED Display
on or off.
TV GUIDE
TV GUIDE
CHANNEL (E, D) Buttons
VOLUME (F,G) Buttons Power Standby Indicator
MENU Button Blinks orange in standby mode,
TV/VIDEO Button blinks green when the TV is
turned on.
TV GUIDE Button
Remote Control
Sensor
POWER Button
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
W This is a back panel of 50PX4DR series TVs.
Back Connection Panel
S-VIDEO Input
FRONT
A connection is available to provide
A/V INPUT
S-VIDEO
better picture quality than the video
input.
VIDEO
VIDEO Input
Connects the video signal from a
L / MONO
video device.
R AUDIO
AUDIO Input
Connections are available for listening
stereo sound from an external device.
Memory Card Slots
RGB/AUDIO INPUT
Connect the monitor output Remote Control Port
IEEE1394
connector from a PC to the Connect your wired
Connect DVHS or
appropriate input port. remote control here.
MicroMV to IEEE1394
Connector.
DVD/DTV Input
(Component 1-2) S-Video Input
RS-232C INPUT (CON- Connect a component Antenna Input
Connect S-
G-LINK TM TROL/SERVICE) PORT video/audio device to Connect over-the-
Video out from
Connect an IR Connect to the RS-232C these jacks. air signals to this
an S-VIDEO
controller to this port on a PC. jack.
device to the S-
jack. VIDEO input.
RS-232C INPUT
(CONTROL/SERVICE)
VIDEO AUDIO VIDEO AUDIO
OUTPUT
Cable AC INPUT
L R L R
HDMI 2 COMPONENT INPUT 2 MONITOR OUTPUT
COMPONENT2 DIGITAL AUDIO (OPTICAL)
IEEE-1394 INPUT DVD
REMOTE CABLE ANTENNA
/DTV
AUDIO INPUT CONTROL
HDMI1/DVI RGB INPUT
INPUT (MONO)
DVI COMPONENT INPUT 1 A/V INPUT S-VIDEO
INPUT
CableCARDTM Digital Audio (DVI: Digital Monitor Output
Used for Visual Connect a second
CableCARDTM Interface/Component2) Audio/Video Input TV or Monitor.
received from Cable Input/ Connect audio/video
Service Provider. Digital Audio Output output from an CABLE Input
Connect digital audio from external device to Connect cable signals to this
HDMI1/DVI, HDMI 2 various types of equipment. jack, either directly or through
these jacks.
Connect a HDMI sig- Note: In standby mode, a cable box.
nal to HDMI1/DVI or these ports will not work.
HDMI2. Or connect a Power Cord Socket
DVI(Video) signal to This TV operates on an AC power. The voltage
HDMI1/DVI. is indicated on the Specifications page. Never
attempt to operate the TV on DC power.
Note:
- After removing the cover, you can insert the CableCARDTM or connect to the G-LINK jack.
- 5 -
DESCRIPTION OF CONTROLS
Remote Control Key Functions
- When using the remote control, aim it at the remote control sensor on the TV.
POWER VCR/DVD BUTTONS
Turns your TV or any other programmed TV INPUT TV/VIDEO