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USA : http//www.lgservice.com
: http//lgservice.com/techsup.html
PLASMA TV
SERVICE MANUAL
CHASSIS : AF-05FB
MODEL : 50PX5D 50PX5D-UB
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
PRINTED CIRCUIT BOARDS .............................................18
BLOCK DIAGRAM...............................................................23
EXPLODED VIEW...............................................................24
EXPLODED VIEW PARTS LIST .........................................25
REPLACEMENT PARTS LIST ............................................26
SCHEMATIC DIAGRAM..........................................................
- 3 -
DESCRIPTION OF CONTROLS
Controls
- This is a simplified representation of a front panel.
- Here shown may be somewhat different from your TV.
Front Panel Controls
50PX5D
TV GUIDE
50PX4D
INDEX
Switches
LED
Display on
TV GUIDE
or off.
TV GUIDE
Power Standby Indicator
Illuminates orange in
CHANNEL (E, D) Buttons standby mode.
When the TV is turned on,
VOLUME (F,G) Buttons the indicator will blink
Remote Control MENU Button green for 3-4 seconds
Sensor TV/VIDEO Button before the picture is seen.
TV GUIDE Button
POWER Button
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
Back Connection Panel
S-VIDEO Input
FRONT
A/V INPUT
A connection is available to provide
S-VIDEO better picture quality than the video
input.
VIDEO Input
VIDEO
Connects the video signal from a
video device.
L / MONO
AUDIO Input
R AUDIO
Connections are available for listening
stereo sound from an external device.
Memory Card Slots
RGB/AUDIO INPUT
IEEE1394 Connect the monitor output
Connect a DVHS, a Remote Control Port
from a PC to the appropriate Connect your wired
MicroMV Camcorder, or input port.
a set-top box to remote control here.
IEEE1394 Connector.
DVD/DTV Input
S-Video Input
RS-232C INPUT (CON- (Component 1-2)
Connect S-
G-LINKTM TROL/SERVICE) PORT Connect a component Antenna Input
Video out from
Connect an IR Connect to the RS-232C video/audio device to Connect over-the-
an S-VIDEO
controller to this port on a PC. these jacks. air signals to this
device to the S-
jack. VIDEO input. jack.
RS-232C INPUT
(CONTROL/SERVICE)
VIDEO AUDIO VIDEO AUDIO
OUTPUT
L R L R
HDMI 2 COMPONENT INPUT 2 MONITOR OUTPUT
COMPONENT2 DIGITAL AUDIO (OPTICAL)
IEEE-1394 INPUT DVD
REMOTE CABLE ANTENNA
/DTV
INPUT CONTROL AC INPUT
AUDIO
HDMI1/DVI RGB INPUT
Cable 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.
TV/VIDEO
External input modes rotate in regular
POWER sequence: Antenna, Cable, Video, Front
Turns your TV or any other programmed TV INPUT TV/VIDEO
Video, Component 1-2, RGB-DTV (or
equipment on or off, depending on mode. RGB-PC), HDMI1/DVI and HDMI2 input
sources.
MODE (Video, Front Video, Component 1-2 input
MODE
Selects the remote operating mode: TV, sources are linked automatically, only if
DVD, VCR, AUDIO, CABLE or STB. Select these are connected )
a mode other than TV, for the remote to
operate an external device.
DAY
DAY - +
TV GUIDE
MENU
Brings up the TV Guide On Screen sys-
Brings up the main menu to the screen.
tem to the screen.
Enters or exits a Panel Menu in the TV Guide
On Screen system.
INFO
EXIT
Channel information is displayed on top of
EXIT 1394 the screen. But not available in
Clears all on-screen displays and returns to Component 1-2, RGB, HDMI1/DVI and
HDMI2 mode.
TV viewing from any menu.
Mark
MUTE Selects a photo or music you want to
Switches the sound on or off. view or play in Xstudio mode.
TIMER FAV
Lets you select the amount of time before FLASHBK Scrolls the Favorite channels.
your TV turns itself off automatically.
FLASHBK
Tunes to the recent channels.
ADJUST APM
Adjusts screen position, size, and phase in
CC FREEZE AUTO DEMO M/C EJECT
PC mode. PIP
Switches to PIP, POP (Picture-out-of-
EZ PIC Picture) and Twin picture modes in regu-
lar sequence.
Selects a factory preset picture mode Switches the video window locking or
depending on the viewing environment. unlocking in the Listings Grid.
PIPCH-/PIPCH+
Changes to the next higher/lower PIP
channel.
FREEZE
Freezes the currently-viewed picture. Main PIP INPUT
picture is frozen in PIP/Twin picture mode. Selects the input source for the sub pic-
ture in PIP/Twin picture mode.
SWAP
AUTO DEMO Exchanges the main/sub images in
Starts the demonstration to explain the main PIP/Twin picture mode.
features of this TV.
LIGHT
Illuminates the remote control
buttons of selected mode.
- 6 -
DESCRIPTION OF CONTROLS
TV INPUT