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PLASMA TV
SERVICE MANUAL
CHASSIS : RF-043A
MODEL : RU-42PZ61 RU-42PZ71
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..........................................................26,28
EXPLODED VIEW PARTS LIST ....................................27,29
REPLACEMENT PARTS LIST ............................................30
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.
Front Panel Controls
FRONT A/V INPUT
R
ON/OFF S-VIDEO VIDEO L/MONO AUDIO R TV/VIDEO MENU VOL CH
RU-50PZ61
TruSurround XT
ruSurround
RU-60PZ61
1 2 3 4 5 6 7
8 9 10 11
FRONT A/V INPUT
S-VIDEO VIDEO L/MONO AUDIO R ON/OFF
R
TruSurround XT
ruSurround TV/VIDEO MENU VOL CH
RU-42PZ61
2 3 4 1 5 6 7
8 9 10 11
FRONT A/V INPUT
R
S-VIDEO VIDEO L/MONO AUDIO R ON/OFF ruSurround
TruSurround XT TV/VIDEO MENU VOL CH
RU-42PZ71
2 3 4 1 5 6 7 10 11
8 9
1. ON/OFF Button
6. Remote Control Sensor
2. S-VIDEO Input
A connection available to provide better picture quality than 7. Power Standby Indicator
the video input. Illuminates red in standby mode, Illuminates green when the
TV is turned on.
3. VIDEO Input
Connects the video signal from a video device. 8. TV/VIDEO or ENTER Button
4. AUDIO Input 9. MENU Button
Use to connect to hear stereo sound from an external device.
10. VOLUME (F,G) Buttons
5. INDEX
Switches LED Display on or off. 11. CHANNEL (E, D) Buttons
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
Monitor Output
Remote Control Port Connect a second TV or
Connect your wired RS-232C INPUT DVD/DTV Input (Component 1-2) Monitor.
remote control here. (CONTROL/SER- Connect a component video/audio S-Video Input
VICE) PORT device to these jacks. Connect S-Video out from an S-
Connect to the RS- VIDEO device to the S-VIDEO
232C port on a PC. input.
COMPONENT MONITOR
INPUT 2
R OUTPUT
R L COMPONENT A/V AC INPUT
INPUT 1 INPUT 1 Antenna
REMOTE RS-232C INPUT DVI INPUT AUDIO INPUT RGB INPUT S-VIDEO
(R) (L) (R) (L/MONO)
EXTERNAL SPEAKER CONTROL (CONTROL/SERVICE)
VIDEO AUDIO AUDIO VIDEO
Audio/Video Input 1
DVI Input/Audio Input/ RGB Connect audio/video
Input output from an external Antenna Input
Connect the monitor output con- device to these jacks. Connect cable or antenna
nector from a PC to the appropri- signals to the TV, either
ate input port. directly or through your
cable box.
External Speaker (8 ohm Output)
Connect to optional external speaker(s). Power Cord Socket
* For further information, refer to `Speaker & Speaker This TV operates on AC power. The voltage
Stand' manual. 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.
LIGHT MODE
Illuminates the remote control buttons. Selects the remote operating mode: TV,
TV/VIDEO VCR, DVD, CABLE, HDSTB or AUDIO.
Selects: TV, Video1-2, Component 1-2, Select other operating modes, for the
RGB, and DVI input sources. HD remote to operate external devices.
POWER
MODE
LIGHT
POW
ER Turns your TV or any other programmed
MULTIMEDIA MULTIMEDIA ARC equipment on or off, depending on mode.
O
TV/VIDE
Selects: Component 1-2, RGB, and
DVI input sources. ARC
Changes the aspect ratio.
NUMBER buttons REVIEW
Tunes to the last channel viewed.
FCR REVIEW
FCR
Use to scroll the Surf channel list. APC
Adjusts the factory preset picture according
MUTE
MUTE APC
to the room.
Switches the sound on or off. VOL CH
CHANNEL UP/DOWN
Selects available channels found
PIP/DW CAPTION
VOLUME UP/DOWN MENU EXIT
with Auto program.
Increases/decreases the sound level. CAPTION
Selects CAPTION mode.
MENU
Brings up the main menu to the screen. ENTER
EXIT
Clears all on-screen displays and returns
PIP/DW to TV viewing from any menu.
Switches between PIP, and
PIP CH- PIP INPUT PIP INPUT
Double Window modes.
PIP CH+ SWAP Selects the input source for the sub picture.
THUMBSTICK (Up/Down/Left/Right/ENTER) PLAY PAUSE STOP RECORD
SWAP
Allows you to navigate the on-screen Exchanges the sub/main images.
menus and adjust the system settings to REW FF SKIP
VCR/DVD BUTTONS
your preference. Control some video cassette recorders or
WIN.SIZE WIN.POSITION SLEEP
DVD player ("RECORD" button is not avail-
PIPCH-/PIPCH+ MEMORY/ERASE DASP MTS
able for DVD player).
Changes to next lower/higher PIP channel.
A.PROG SPLIT ZOOM
SLEEP
Sets the sleep timer.
WIN. SIZE MTS
Adjusts the sub picture size. Selects the MTS sound: Mono, Stereo, or
MEMORY/ERASE SAP.
Memorizes or erases selected channel. DASP
A.PROG (AUTO PROGRAM) Selects the sound appropriate for the pro-
Searches for available channels. gram's character.
SPLIT ZOOM WIN.POSITION
Enlarges the picture. Moves the sub picture.
- 6 -
SPECIFICATIONS
MODEL RU-42PZ61 RU-42PZ71 RU-50PZ61 RU-60PZ61
Width (inches / mm) 49.6 / 1260 49.6 / 1260 57.7 / 1465 56.5 / 1436
Height (inches / mm) 28.5 / 724.8 28.6 / 726.2 33.3 /845.6 36 / 913.2
Depth (inches / mm) 11.3 / 287 11.3 / 287 13.2 / 335 3.9 / 98.6
Weight (pounds / kg) 96.7 / 43.84 96.7 / 43.84 117.5 / 53.3 172.3 / 78.15
Resolution 1024 x 768 (Dot) 852 x 480 (Dot) 1366 x 768 (Dot) 1366 x 768 (Dot)
Power requirement AC100-240V, 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