Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_42PX4R_MF-056A_[SM]

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LG_42PX4R_MF-056A_[SM]


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                                                                   website:http://biz.LGservice.com
                                                   e-mail:http://www.LGEservice.com/techsup.html




PLASMA TV
SERVICE MANUAL
CHASSIS : MF-056A

MODEL : 42PX4R
                42PX4R-ZA

CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




                    TV/AV   MENU   OK   VOL   PR
                                              CONTENTS




SAFETY PRECAUTIONS ....................................................................................3

DESCRIPTION OF CONTROLS ..........................................................................4

SPECIFICATIONS ................................................................................................9

ADJUSTMENT INSTRUCTIONS .......................................................................11

TROUBLE SHOOTING GUIDE ..........................................................................15

BLOCK DIAGRAM .............................................................................................24

EXPLODED VIEW ..............................................................................................26

EXPLODED VIEW PARTS LIST ........................................................................27

REPLACEMENT PARTS LIST...........................................................................28

SCHEMATIC DIAGRAM.........................................................................................

PRINTED CIRCUIT BOARD ..................................................................................




                                                      - 2 -
                                             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 isolation 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 circuitry that may be             voltage measurements for each exposed 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 specified, 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 position, 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
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.




                                                                 - 3 -
                                   DESCRIPTION OF CONTROLS

Remote Control Key Functions
   - When using the remote control aim it at the remote control sensor of the set.
   - There's maybe a defect in consecutive operation of remote control in specified brightness according to this set feature.




                                     TV/AV                                                             POWER
    Selects the TV, AV, Component, RGB or                                                              switches the set on from standby or off to
                              HDMI modes.              TV/AV                              MULTIMEDIA   standby.
          switches the set on from standby.                            POWER
                                                                                                       MULTIMEDIA
                                      MODE                                 DVD
                                                                                            VCR
                                                                                                       Selects the Component, RGB or HDMI
                                                         TV
                      Selects another device.                              MODE
                                                                                                       modes.
                                                                           CABLE
                                                       AUDI
                                                           O                                STB        switches the set on from standby.
                          ZOOM - / ZOOM +
                                                                    ZOOM -    ZOOM +
  Enlarges or reduces the main picture size.            PIP
                                                                                            MU
                                                                                               TE      MUTE
                                                                   SLEEP         LIST                  Switches the sound on or off.
                                      SLEEP            TEX
                                                          T/
                                                               *                             I/II



                         Sets the sleep timer.                                                         I/II
                                                            U
                                                                           ARC
                                                                                          EXIT
                                                                                                       Selects the language during dual lan-
                                                        MEN
                                                                                                       guage broadcast.
                                      MENU                                                             Selects the sound output.
     Displays on screen menus one by one.
                     Exits the current menu.                                                           LIST
                 Memorizes menu changes.                                   OK                          Displays the programme table.

                                         PIP                                                           EXIT
          Switches the sub picture on or off.                                                          Clears all on-screen displays and returns
                 Selects PIP or DW modes.             PIP
                                                                                                       to TV viewing from any menu.
                                                          PR                                      UT
                                                                                               INP
                                PIP PR + /-                  -
                                                                   PIP PR +      SWAP
                                                                                           PIP

  Selects a programme for the sub picture.
                                      SWAP                                                             ARC
  Alternates between main and sub picture.                                                             Changes the picture format.
                                                      VOL           SSM       PSM            PR
                                 PIP INPUT
 Selects the input mode for the sub picture.                                                           OK
                                       SIZE                                                            accepts your selection or displays the cur-
                Adjusts the sub picture size.                                                          rent mode.
                                 POSITION                                                              D / E or F / G
   Moves the sub picture to D / E or F / G                                                             Adjusts menu settings.
                                   direction.                                                          Selects menu item.

                                       SSM                                                             VOL +/- (Volume Up/Down)
     To select the sound appropriate to your           FAVOURITE                         Q.VIEW        Increases/decreases sound level.
              viewing programme character.                                                             PR +/- (Programme Up/Down)
                                                         SIZE      POSITION      INDEX     HOLD
                                                                                                       Selects a programme.
                           NUMBER buttons
                                                         TIME       REVEAL         MIX     MODE

                                                                       ?                      M        PSM
                                 FAVOURITE                                                             Adjusts the factory preset picture accord-
               selects a favorite programme.                                                           ing to the room.

                                                                                                       Q.VIEW
                                        TEXT/
         These buttons are used for teletext. *                                                        Returns to the previously viewed pro-
                                                                                                       gramme.
For further details, see the `Teletext' section.
     Note : In teletext mode, the PIP PR +/-,
 SWAP and PIP INPUT buttons are used for                                                               VCR BUTTONS
                              teletext function.                                                       Controls a LG video cassette recorder.




                                                                   - 4 -
Location and Function of Controls


                                                   




                                                                                                                         7

                                                                                         TV/AV   MENU   OK    VOL   PR
                                                                                                                         8




                                                     TV/AV   MENU   OK       VOL                             PR




                                  2            1         3    4     5                6




1. Power Button                                                     6. D / E (Programme Up/Down)
   Switches the set on from standby or off to standby.                 Selects a programme or a menu item.
                                                                       Switches the set on from standby.
2. Remote Control Sensor
                                                                       F / G (Volume Up/Down)
3. TV/AV Button                                                        Adjusts the volume.
   Selects the TV, AV, Component, RGB or HDMI modes.                   Adjusts menu settings.
   Switches the set on from standby.
                                                                    7. Power Indicator
4. MENU                                                                Illuminates red in standby mode, Illuminates green when the
   Displays on screen menus one by one.                                set is turned on
   Exits the current menu.
                                                                    8. Intelligent Eye
   Memorizes menu changes.
                                                                       Adjusts picture according to the surrounding conditions.
5. OK
   Accepts your selection or displays the current mode.




                                                               - 5 -
Location and Function of Controls
- Shown is a simplified representation of the set.
- Here shown may be somewhat different from your set.
- This manual explains the features available on the 42PX4RV series / RT-42PX40 series.




                                                                                          




                                                                                                                                                            AV5
                                                                                                                                                          S-VIDEO




                                                                                                                                                                    VIDEO
                                                                                                                                                                                                9




                                                                                                                                                                    R AUDIO L/MONO
                                                                      VIDEO                   AUDIO
                                                                                                                                     AV1                                             AC INPUT
                                                                                          L            R
                  HDMI/                                                       COMPONENT                          AUDIO                          Antenna
                DVI(VIDEO)   AUDIO INPUT     RGB INPUT
                                                                                                             L        R

                                                                                                            VARIABLE
                                                                                                            VARIABLE                 AV2
                                                                                                            AUDIO OUT
                 REMOTE                    RS-232C INPUT
                 CONTROL                   (CONTROL/SERVICE)   AV4
                                                                                                                                     AV3
                                                                                          L            R
                                                                                              (MONO)
                                                                     S-VIDEO VIDEO
                                                                                              AUDIO




    1              2                              3                            4                                  5            6                  7                                      8


1. HDMI(DVI VIDEO) / AUDIO INPUT / RGB INPUT                                                                       5. VARIABLE AUDIO OUTPUT
   Connect the monitor output socket of the PERSONAL COM-
   PUTER, DVD or STB to this socket.                                                                               6. EURO SCART SOCKET
   Note: If you want to use RGB/DVI audio, we strongly recom-                                                         Connect the euro scart socket of the VCR to these sockets.
   mend that you use the cable that has a core, or the EMI Filter                                                     Note: If you want to use the EURO scart cable, you have to
   core along with separate cable.                                                                                    use the signal shielded Euro scart cable.

2. CONTROL LOCK / REMOTE CONTROL                                                                                   7. ANTENNA INPUT

3. RS-232C INPUT(CONTROL/SERVICE) PORT                                                                             8. POWER CORD SOCKET
   Connect to the RS-232C port on a PC.                                                                               This set operates on an AC power. The voltage is indicated on
                                                                                                                      the Specifications page. Never attempt to operate the set on
4. COMPONENT INPUT                                                                                                    DC power.
   Connect DVD video outputs to Y, PB, PR of COMPONENT
   INPUT and audio outputs to Audio sockets of AUDIO INPUT.                                                        9. AUDIO/VIDEO INPUT (AV5)
                                                                                                                      S-VIDEO/AUDIO IN SOCKETS
  AUDIO/VIDEO IN SOCKETS (AV4)
  Connect the audio/video out sockets of external equipment to
  these sockets.
  S-VIDEO/AUDIO IN SOCKETS
  Connect the S-VIDEO out socket of an VCR to the S-VIDEO
  socket.
  Connect the audio out sockets of the VCR to the audio sock-
  ets as in AV4.




                                                                                                           - 6 -
Displayable Monitor Specification
 RGB / HDMI mode
                     Horizontal     Vertical
     Resolution   Frequency(KHz) Frequency(Hz)
                      31.468         70.09
      640x350
                      37.861         85.08
                      31.469         70.08
      720x400
                      37.927         85.03
                      31.469         59.94
                      35.000         66.66
      640x480         37.861         72.80
                      37.500         75.00
                      43.269         85.00
                      31.500         60.00
      848x480         37.799         70.00
                      39.375         75.00
                      31.500         60.00
      852x480         37.799         70.00
                      39.375         75.00
                      35.156         56.25
                      37.879         60.31
      800x600         48.077         72.18
                      46.875         75.00
                      53.674         85.06
      832x624         49.725         74.55
                      48.363         60.00
                      56.476         70.06
     1024x768
                      60.023         75.02
                      68.677         85.00
                      54.348         60.05
     1152x864         63.995         70.01
                      67.500         75.00
     1152x870         68.681         75.06
     1280x960         60.023         60.02
     1280x1024        63.981         60.02




                                                 - 7 -
Accessories
                                                                      TV/AV                                 MULTIMEDIA


                                                                                         POWER


                                                                                             DVD
                                                                        TV                                    VCR
                                                                                             MODE

                                                                                             CABLE
                                                                                                              STB
                                                                       AUDIO


                                                                                      ZOOM -    ZOOM +
                                                                                                              MUTE
                                                                        PIP


                                                                                     SLEEP         LIST

                                                                      TEXT/      *                             I/II




                                                                                             ARC
                                                                                                            EXIT
                                                                        MENU




                                                                                             OK




                                                                      PIP
                                                                            PR                                     INPUT
                                                                                 -                           PIP
                                                                                     PIP PR +      SWAP




                                                                      VOL             SSM       PSM            PR




                                                                      FAVOURITE                            Q.VIEW



                                                                            SIZE     POSITION      INDEX     HOLD



                                                                            TIME      REVEAL         MIX     MODE

                                                                                         ?                      M




                LG TV

              AS mark




        Owner's Manual                                Remote Control handset                                                                        2-Eye Bolts




                   1.5V
                     1.5V


       Alkaline batteries                                          Power Cord                                                                     2-Wall brackets




Joinning the set assembly to the wall to protect the set tumbling
- Secure the set assembly by joinning it to a wall by using the Eye Bolts/Wall brackets.


                                                        



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