Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_42PX3RV_MF-056A_[SM]

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LG_42PX3RV_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 : 42PX3RV/RVB
                42PX3RV/RVB-ZA

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 ..........................................................................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




                              MUTE                                           POWER
         Switches the sound on or off.                                       switches the set on from standby or
                                                                             off to standby.
                      MULTIMEDIA              MUTE               POWER
Selects the Component, RGB or DVI                                            I/II
                             modes.                                          Selects the language during dual lan-
   switches the set on from standby.                                         guage broadcast.
                                              TV/AV MULTIMEDIA    I/II
                                                                             Selects the sound output.
                               TV/AV
Selects the TV, AV, Component, RGB                                           ARC
                                               LIST      ARC     MENU        Changes the picture format.
                       or DVI modes.
    switches the set on from standby.
                                                                             MENU
                               LIST                                          Displays on screen menus one by
       Displays the programme table.                                         one.
                                                                             Exits the current menu.
                                                         PR                  Memorizes menu changes.
      D / E (Programme Up/Down)                          OK
selects a programme or a menu item.             VOL              VOL
    switches the set on from standby.
                                                         PR
           F / G (Volume Up/Down)
                  adjusts the volume.
               adjusts menu settings.                                        NUMBER buttons
                                   OK
accepts your selection or displays the          1         2        3
                        current mode.
                                                                             SSM
                                                4         5        6         To select the sound appropriate to
                                                                             your viewing programme character.
                                  PSM           7         8        9
     Adjusts the factory preset picture
               according to the room.
                                               PSM        0       SSM
                        SPLIT ZOOM                                           SLEEP
       Enlarge the screen with regular       SPLIT ZOOM PIP/DW    SLEEP      Sets the sleep timer.
                                ration.
                                             REVEAL     PIP PR+ TEXT/
                                                                             TEXT/
                                PIP/DW
     Switches the sub picture on or off.
                                                 ?
                                             WIN. SIZE PIP PR-    MIX
                                                                                   *
                                                                             These buttons are used for teletext.
                                                                             For further details, see the 



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