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PLASMA MONITOR
SERVICE MANUAL
CHASSIS : RF-043E
MODEL : MU-42PM11 MU-42PM12X
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 ...........................................13
BLOCK DIAGRAM...............................................................24
EXPLODED VIEW...............................................................26
EXPLODED VIEW PARTS LIST .........................................27
REPLACEMENT PARTS LIST ............................................28
SCHEMATIC DIAGRAM..........................................................
PRINTED CIRCUIT BOARD ...................................................
- 3 -
DESCRIPTION OF CONTROLS
Controls
Front Panel Controls
- This is a simplified representation of a typical front panel.
The Front Panel Controls shown here may be somewhat different from your monitor.
MU-42/50PM10/11 series
6
5
3 2
ON/OFF
4
1
MU-42/50PM20 series
ON/OFF
1 2 3 4 5 6
1. Main Power Button 5. MENU
Displays on screen menus one by one.
2. Remote Control Sensor Exits the current menu.
Memorizes menu changes.
3. Power Standby Indicator
Illuminates red in standby mode. Illuminates green when the 6. D / E
Monitor is turned on. Selects a menu option.
F / G (Volume Up/Down)
4. INPUT SELECT Button Increases/decreases sound level.
Adjusts menu settings.
- 4 -
DESCRIPTION OF CONTROLS
Connection Options
- Connection panels shown may be somewhat different from your monitor.
Back Connection Panel
Y PB PR ( )R( ) ( )L( )
REMOTE RS-232C INPUT DVI INPUT AUDIO INPUT RGB INPUT RGB OUTPUT AC INPUT
CONTROL (CONTROL/SERVICE) EXTERNAL SPEAKER
R L R L (MONO)
COMPONENT INPUT AUDIO INPUT S-VIDEO AUDIO INPUT VIDEO INPUT
1 2 3 4 5 6 7 8 9
1. REMOTE CONTROL 6. S-VIDEO INPUT SOCKETS
Connect your wired remote control to the remote control Connect S-Video out from an S-VIDEO device to the S-
port on the Monitor. VIDEO input.
2. RS-232C INPUT (CONTROL/SERVICE) PORT NOTE: AUDIO INPUT of S-VIDEO is worked by L(mono).
Connect to the RS-232C port on a PC.
7. VIDEO / AUDIO (L/MONO) INPUT SOCKETS
3. DVI (Digital Visual Interface) INPUT/ Connect audio/video output from an external device to
AUDIO INPUT/ RGB INPUT JACKS these jacks.
Connect the monitor output connector from a PC to the
appropriate input port. 8. EXTERNAL SPEAKER (8 ohm output)
Connect to optional external speaker(s).
4. RGB OUTPUT PORT * For further information, refer to `Speaker & Speaker
You can watch the RGB signal on another monitor, connect Stand' manual.
RGB OUTPUT to another monitor's PC input port.
9. POWER CORD SOCKET
5. COMPONENT INPUT/AUDIO INPUT JACKS This Monitor operates on an AC power. The voltage is indi-
Connect a component video/audio device to these jacks. cated on the Specifications page. Never attempt to operate
the Monitor 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 monitor.
- Under certain conditions such as if the remote IR signal is interrupted, the remote control may not function. Press
the key again as necessary.
POWER
Switches the Monitor between
INPUT SELECT
ON and STANDBY.
Selects source: RGB, DVI, Component,
SLEEP Video, or S-Video mode.
Sets the Sleep Timer. POWER
DASP
SLEEP INPUT SELECT
APC To select the sound appropriate to
Adjusts the factory preset picture APC DASP your viewing program character:
according to the room. ARC SPLIT ZOOM
Flat, Music, Movie, Sports, SRS TSXT or
Off.
PIP/DW WIN.POSITION
SPLIT ZOOM
ARC SWAP SUB INPUT
Enlarges the picture.
Changes the picture format.
MENU MUTE
PIP/DW WIN.POSITION
Switches the sub picture on or off. Moves the sub picture.
VOL OK VOL
SUB INPUT
SWAP Selects the input source for the sub
Exchanges main and sub picture picture.
images. MUTE
Switches the sound on or off.
MENU 1 2 3
Displays on screen menus one by one. 4 5 6
OK
Exits the current menu. D /E
7 8 9
Selects menu option.
0 WIN.SIZE
NUMBER buttons Memorizes menu changes.
POWER STOP PAUSE
F / G (Volume button)
REW PLAY FF Increases/decreases sound level.
DVD buttons SKIP
OPEN/CLOSE
Adjusts menu settings.
Control some DVD cassette DVD
recorders. WIN.SIZE
POWER
W
Adjusts the sub picture size.
VCR
STOP P/STILL REC
WIN.P VCR BUTTONS
REW PLAY FF
Control some video cassette
recorders.
- 6 -
SPECIFICATIONS
MODELS MU-42PM11/20 MU-42PM12X MU-50PM10/11/20
Width (inches / mm) 42 / 1066 49.3 / 1253
Height (inches / mm) 25.8 / 656 29.3 / 745
Depth (inches / mm) 3.8 / 97.5 3.9 / 99.5
Weight (pounds / kg) 64.6 / 29.3 84.7 / 38.4
Resolution 852 x 480 (Dot) 1024 x 768 (Dot) 1366 x 768 (Dot)
Power requirement AC100-240V, 50/60Hz AC100-240V, 60Hz
Color 16,770,000 (256 steps of each R, G and B)
Operating Temperature Range 32 ~ 104