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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-05FC
MODEL : 50PX1D 50PX1D-UC
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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...............................................................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.
Here shown may be somewhat different from your TV.
Front Panel Controls
TV/VIDEO MENU VOL CH
POWER Button
MENU Button CHANNEL (E, D) Buttons
Remote Control Sensor TV/VIDEO Button VOLUME (F,G) Buttons
Power Standby Indicator
-Without CableCARDTM : Illuminates red in
standby mode, Illuminates green when the
TV is turned on.
-Inserting the CableCARDTM : Illuminates
orange in standby mode, Illuminates green
when the TV is turned on.
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
Back Connection Panel
S-VIDEO Input
FRONT
A/V INPUT A connection available to provide bet-
ter 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.
RGB/AUDIO INPUT
Connect the monitor output connector Remote Control Port
from a PC to the appropriate input port. Connect your wired
CableCARDTM remote control here.
Used for
CableCARDTM RS-232C INPUT (CON- DVD/DTV Input S-Video Input
TROL/SERVICE) PORT (Component 1-2) Connect S- Antenna Input
received from
Connect to the RS-232C Connect a component Video out from Connect over-the-
Cable Service
port on a PC. video/audio device to an S-VIDEO air signals to this
Provider.
these jacks. device to the S- jack.
VIDEO input.
RS-232C INPUT
(CONTROL/SERVICE)
OUTPUT VIDEO AUDIO VIDEO AUDIO
L R L R
COMPONENT INPUT 2 MONITOR OUTPUT
COMPONENT2 DIGITAL AUDIO (OPTICAL)
INPUT DVD
REMOTE CABLE ANTENNA AC INPUT
HDMI /DVI /DTV
CONTROL
RGB INPUT AUDIO INPUT
Cable INPUT
(MONO)
DVI
COMPONENT INPUT 1 A/V INPUT
INPUT S-VIDEO
Digital Audio (DVI: Monitor Output
HDMI/DVI Digital Visual Audio/Video Input Connect a second TV
connect a Interface/Component2) Connect audio/video or Monitor.
DVI(Video) Input/ output from an
signal to Digital Audio Output external device to CABLE Input
HDMI/DVI. Connect digital audio these jacks. Connect cable signals to this
from various types of jack, either directly or through
equipment. Note: In a cable box.
standby mode,
Power Cord Socket
these ports will not
This TV operates on an AC power. The voltage
work.
is indicated on the Specifications page. Never
attempt to operate 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.
TV INPUT