Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_MU-42PM11_MU-42PM12X_[SM]

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LG_MU-42PM11_MU-42PM12X_[SM]


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                                CANADA : http//biz.lgservice.com
                                USA    : http//www.lgservice.com
                                       : http//lgservice.com/techsup.html




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



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