Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_42PX5R_MF-056B_[SM]

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LG_42PX5R_MF-056B_[SM]


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




PLASMA TV
SERVICE MANUAL
CHASSIS : MF-056B

MODEL : 42PX5R
                42PX5R-ZB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
                                              CONTENTS




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

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

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

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

TROUBLE SHOOTING GUIDE ..........................................................................16

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



                                      INPUT                                                          POWER
Selects the TV, AV1, AV2, S-Video, AV3, AV4,                                                         switches the set on from standby or off to
    AV5, Component, RGB or HDMI modes.                                                               standby.
           switches the set on from standby.
                                                                                                     MULTIMEDIA
                                      MODE
                                                    INPUT                             MULTIMEDIA
                                                                                                     Selects the Component, RGB or HDMI
                                                                   POWER                             modes.
                      Selects another device.
                                                                                                     switches the set on from standby.
                                                                       DVD
                               VCR BUTTONS            TV                                VCR

          Controls a video cassette recorder.
                                                                       MODE
                                                                                                     MARK
                                                                       CABLE
        These buttons are used for X-Studio.        AUDIO                                STB         Selects the wanted functions.
For further details, see the `X-Studio' section.

                                        INFO                                                         Brings up the menu to select the Photo or
    Displays information on top of the screen                 INFO i     MARK                        Music mode of Xstudio for memory cards.
                      whilst watching the TV.
                                                        U                            EXIT
                                      MENU           MEN                                             EXIT
     Displays on screen menus one by one.                                                            Clears all on-screen displays and returns
                     Exits the current menu.                                                         to TV viewing from any menu.
                 Memorizes menu changes.
                                                                       OK
                                                                                                     PIP
                                          OK                                                         Switches the sub picture on or off.
       accepts your selection or displays the                                                        Selects PIP, POP or DW modes.
                               current mode.                                                         PIP PR + /-
                                                                                                     Selects a programme for the sub picture.
                             D / E or F / G        PIP P
                                                        R-
                                                             PIP PR +                  PIP IN
                                                                                               PUT
                                                                                                     SWAP
                                                                             SWAP
                       Adjusts menu settings.                                                        Alternates between main and sub picture.
                          Selects menu item.                                                         PIP INPUT
                                                   VOL        MUTE           FAV         PR          Selects the input mode for the sub picture.
           VOL D / E (Volume Up/Down)                                                                SIZE
          Increases/decreases sound level.                                                           Adjusts the sub picture size.
         PR D / E (Programme Up/Down)                                                                POSITION
                     Selects a programme.                                                            Moves the sub picture to D / E or F / G
                                                                                                     direction.
                                     MUTE
                Switches the sound on or off.                                                        FAV
                                                                                                     selects a favourite programme.
                           NUMBER buttons
                                                      LIST                           Q.VIEW
                                      LIST                                                           Q.VIEW
              Displays the programme table.           SIZE   POSITION        INDEX     HOLD          Returns to the previously viewed
                                                                                                     programme.
                                                      TIME    REVEAL           MIX     MODE
                                         PSM                      ?                       M
 Adjusts the factory preset picture according         PSM      SSM           ARC       TEXT
                                                                                                     TEXT
                                 to the room.                                                        These buttons are used for teletext.
                                                     SLEEP      I/II           PIP    M/C EJECT
                                                                                                     For further details, see the `Teletext' section.
                                                                                                     Note : In teletext mode, the PIP PR +/-,
                                       SSM                                                           SWAP and PIP INPUT buttons are used
     To select the sound appropriate to your                                                         for teletext function.
                        viewing programme.

                                      SLEEP                                                          M/C EJECT
                         Sets the sleep timer.                                                       Remove the Memory Card.

                                        I/II                                                         ARC
 Selects the language during dual language                                                           Changes the picture format.
                                 broadcast.
                  Selects the sound output.




                                                               -4-
                                                


                                                                                                                           10




                                                                                                      7
                                                                                                      8
                                                                                                      9




                                    INPUT      MENU       OK            VOL                  PR




                1           2          3          4        5                          6




1. Remote Control Sensor                                         7. INDEX
                                                                    Switches FRONT Display on or off.
2. Power Button
   Switches the set on from standby or off to standby.           8. Power Indicator
                                                                    Illuminates red in standby mode, illuminates green when
3. INPUT Button                                                     the set is turned on.
   Selects the TV, AV, Component, RGB or HDMI modes.
   Switches the set on from standby.                             9. Intelligent Eye
                                                                    Adjusts picture according to the surrounding conditions.
4. MENU
   Displays on screen menus one by one.                          10. Memory Card Slots 1, 2
   Exits the current menu.
   Memorizes menu changes.

5. OK
   Accepts your selection or displays the current mode.

6. D / E (Programme Up/Down)
   Selects a programme or a menu item.
   Switches the set on from standby.
   F / G (Volume Up/Down)
   Adjusts the volume.
   Adjusts menu settings.




                                                               -5-
                                                                                          



                                                                                                                                                                            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
   COMPUTER, DVD or STB to this socket.                                                                           6. EURO SCART SOCKET
   Note: If you want to use RGB/DVI audio, we strongly                                                               Connect the euro scart socket of the VCR to these sockets.
   recommend that you use the cable that has a core, or the                                                       Note:
   EMI Filter core along with separate cable.                                                                        a. If you want to use the EURO scart cable, you have to use
                                                                                                                     the signal shielded Euro scart cable.
2. REMOTE CONTROL                                                                                                    b. If the S-VIDEO(Y/C) signal is received through the Euro
                                                                                                                     scart socket 2 (AV 2), you must change to the S-Video 2
3. RS-232C INPUT(CONTROL/SERVICE) PORT                                                                               (Y/C) mode.
   Connect to the RS-232C port on a PC.
                                                                                                                  7. ANTENNA INPUT
4. COMPONENT INPUT
   Connect DVD video outputs to Y, PB, PR of COMPONENT                                                            8. POWER CORD SOCKET
   INPUT and audio outputs to Audio sockets of AUDIO INPUT.                                                          This Monitor operates on AC power. The voltage is indicated
                                                                                                                     on the Specifications page. Never attempt to operate the set
  AUDIO/VIDEO IN SOCKETS (AV4)                                                                                       on DC power.
  Connect the audio/video out sockets of external equipment
  to these sockets.
  S-VIDEO/AUDIO IN SOCKETS                                                                                        9. AUDIO/VIDEO INPUT (AV5)
  Connect the S-VIDEO out socket of an VCR to the S-VIDEO                                                            S-VIDEO/AUDIO IN SOCKETS
  socket.
  Connect the audio out sockets of the VCR to the audio sockets
  as in AV4.




                                                                                                           -6-
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




Joining the set assembly to the wall to prevent the set tumbling
- Secure the set assembly by joining it to a wall by using the Eye Bolts/Wall brackets.


                                                        



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