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PLASMA TV
SERVICE MANUAL
CHASSIS : RF-043A
MODEL : RU-42PX10/C RU-42PX11/H
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 specified. 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
Due to high vacuum and large surface area of picture tube,
AC Volt-meter
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
Good Earth Ground
such as WATER PIPE,
Leakage Current Cold Check(Antenna Cold Check) To Instrument's CONDUIT etc.
With the instrument AC plug removed from AC source, 0.15uF
exposed
connect an electrical jumper across the two AC plug prongs. METALLIC PARTS
Place the AC switch in the on positioin, connect one lead of
ohm-meter to the AC plug prongs tied together and touch other
ohm-meter lead in turn to each exposed metallic parts such as 1.5 Kohm/10W
antenna terminals, phone jacks, etc.
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 CANADA: LG Electronics Canada, Inc. 550 Matheson
reading must be infinite. Boulevard East Mississauga, Ontario L4Z 4G3
An other abnormality exists that must be corrected before the
receiver is returned to the customer. 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.................................................................7
ADJUSTMENT INSTRUCTIONS ..........................................8
TROUBLE SHOOTING GUIDE ...........................................12
BLOCK DIAGRAM...............................................................23
EXPLODED VIEW...............................................................26
EXPLODED VIEW PARTS LIST .........................................27
REPLACEMENT PARTS LIST ............................................28
SCHEMATIC DIAGRAM..........................................................
PRINTED CIRCUIT BOARD ...................................................
- 3 -
DESCRIPTION OF CONTROLS
Controls
- This is a simplified representation of front panel.
Here shown may be somewhat different from your TV.
- This manual explains the features available on the RU-42PX10 TVs.
Front Panel Controls
ON/OFF
TV/VIDEO MENU VOL CH
ON/OFF Button
MENU Button CHANNEL (E, D) Buttons
Remote Control Sensor TV/VIDEO Button VOLUME (F,G) Buttons
Power Standby Indicator
Illuminates red in standby mode,
Illuminates green when the TV is
turned on.
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
S-VIDEO Input
A connection available to provide better
picture quality than the video input.
S-VIDEO
VIDEO Input
VIDEO
A/V INPUT2
Connects the video signal from a video
device.
L / MONO
R AUDIO
AUDIO Input
Use to connect to hear stereo sound
from an external device.
Monitor Output
Connect a second TV or Monitor.
DVD/DTV Input (Component 1-2)
Connect a component video/audio
device to these jacks. S-Video Input
Remote Control Port Connect S-Video out from an S-VIDEO
Connect your wired device to the S-VIDEO input.
remote control here.
COMPONENT MONITOR
INPUT 2 OUTPUT
COMPONENT A/V
INPUT 1 INPUT 1 Antenna AC INPUT
S-VIDEO
REMOTE RS-232C INPUT DVI INPUT AUDIO INPUT RGB INPUT
R L R L/MONO
CONTROL (CONTROL/SERVICE)
VIDEO AUDIO AUDIO VIDEO
Antenna Input
Audio/Video Input 1 Connect cable or antenna
Connect audio/video output from an external signals to the TV, either
device to these jacks. directly or through your
RGB Input/Audio Input/DVI Input cable box.
Connect the monitor output connector from
a PC to the appropriate input port.
Power Cord Socket
RS-232C INPUT (CONTROL/SERVICE) PORT This TV operates on AC power. The voltage is indicated
Connect to the RS-232C port on a PC. 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.
MUTE
MUTE POWER POWER
Switches the sound on or off.
Turns your TV on or off.
TVVIDEO TV/VIDEO MULTIMEDIA MTS
Selects: TV, Video 1-2, Component
1-2, RGB, and DVI input sources. MTS
CAPTION ARC MENU Selects the MTS sound: Mono, Stereo, or
MULTIMEDIA SAP.
Selects: Component 1-2, RGB, and
DVI input sources. MENU
Brings up the main menu to the screen.
CH
CAPTION
Selects CAPTION mode. ENTER ARC
VOL VOL Changes the picture format.
VOLUME UP/DOWN CH
Increases/decreases the sound level.
CHANNEL UP/DOWN
Selects available channels found with NUMBER buttons
1 2 3
Auto program.
ENTER
Accepts your selection or displays the 4 5 6
REVIEW
current mode.
Tunes to the last channel viewed.
7 8 9
FCR FCR REVIEW
Use to scroll the favorite channel list. DASP
0
Selects the sound appropriate for the pro-
APC APC PIP/DW DASP gram's character.
Adjusts the factory preset picture according
to the room. SPLIT ZOOM PIP CH + SLEEP SLEEP
Sets the sleep timer.
PIP/DW WIN.SIZE PIP CH - PIP INPUT
Switches between PIP and Twin
PIPCH-/PIPCH+
picture modes. POSITION SWAP A.PROG Changes to next lower/higher PIP channel.
SPLIT ZOOM MEMORY/ERASE PIP INPUT
Enlarges the picture with regular ration. Selects the input source for the sub picture.
A.PROG (AUTO PROGRAM)
WIN. SIZE Searches for available channels.
Adjusts the sub picture size.
POSITION MEMORY/ERASE
Moves the sub picture in pip mode. Memorizes or erases selected channel.
SWAP
Exchanges the main/sub images.
- 6 -
SPECIFICATIONS
MODELS RU-42PX10/20 RU-50PX10/20
Width (inches / mm) 48.4 / 1210 56 / 1400
Height (inches / mm) 27.6 / 701 30.4 / 761.5
Depth (inches / mm) 11.4 / 290 11.4 / 290
Weight (pounds / kg) 66 / 22.9 66 / 29.9
Resolution 852 x 480 (Dot) 1366 x 768 (Dot)
Power requirement AC100-240V, 50/60Hz
Television System NTSC
Program Coverage VHF 2 ~ 13, UHF 14 ~ 69, CATV 1 ~ 125
External Antenna Impedance 75
Color 16,770,000 (256 steps of each R, G and B)
Operating Temperature Range 32 ~ 104