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LG_DU-42PY10XH_[SM]


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




PLASMA TV
SERVICE MANUAL
CHASSIS : AF-044P

MODEL : DU-42PY10X DU-42PY10XH
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




     POWER             TV GUIDE TV/VIDEO   MENU   VOL   CH
                                            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 same specified type.                                      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
                                                                                            AC Volt-meter

Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source,
connect an electrical jumper across the two AC plug prongs.                                                     Good Earth Ground
Place the AC switch in the on positioin, connect one lead of                                                    such as WATER PIPE,
ohm-meter to the AC plug prongs tied together and touch other            To Instrument's                        CONDUIT etc.
ohm-meter lead in turn to each exposed metallic parts such as                                     0.15uF
                                                                         exposed
antenna terminals, phone jacks, etc.                                     METALLIC PARTS
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                                  1.5 Kohm/10W
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
                                                                      CANADA: LG Electronics Canada, Inc. 550 Matheson
                                                                              Boulevard East Mississauga, Ontario L4Z 4G3

                                                                      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


ADJUSTMENT INSTRUCTIONS ..........................................7


PRINTED CIRCUIT BOARDS .............................................17


BLOCK DIAGRAM...............................................................23


EXPLODED VIEW...............................................................24


EXPLODED VIEW PARTS LIST .........................................25


REPLACEMENT PARTS LIST ............................................26


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




                                                                             - 3 -
                                       DESCRIPTION OF CONTROLS

Controls

- This is a simplified representation of front panel.
  Here shown may be somewhat different from your TV.




                                                   Front Panel Controls




                                                                                                                                                    INDEX
                           R
                                                                                                                                                    Switches
          TruSurround XT                                                                                                                            LED Display
                                                                                                                                                    on or off.


                                           POWER                               TV GUIDE TV/VIDEO   MENU   VOL   CH




                                   POWER             TV GUIDE TV/VIDEO MENU      VOL               CH




                                                                                                                              Remote Control
                                                                                                                              Sensor

                                                                                                                                    Power Indicator
                                                                                        CHANNEL (E,                  D)   Buttons   Illuminates orange in stand-
                               POWER Button
                                                                                                                                    by mode, Illuminates green
                                                                              VOLUME (F,G) Buttons                                  when the TV is turned on.
                                                                                                                                    (If power isn't turn on in red,
                                                                    MENU Button
                                                                                                                                    contact your service center.)
                                                              TV/VIDEO Button
                                                    TV GUIDE Button




                                                                   - 4 -
                              DESCRIPTION OF CONTROLS

Connection Options

                                                            Back Connection Panel




                                                                                                                                      S-VIDEO Input
                                                                                                                                      A connection available to provide bet-
                                                                                                                                      ter picture quality than the video input.




                                                                                                                       S-VIDEO
                                                                                                                                       VIDEO Input




                                                                                                     FRONT A/V INPUT
                                                                                                                                       Connects the video signal from a




                                                                                                                       VIDEO
                                                                                                                                       video device.




                                                                                                                       L / MONO
                                                                                                                                       AUDIO Input




                                                                                                                       R AUDIO
                                                                                                                                       Use to connect to hear stereo sound
                                                                                                                                       from an external device.




      G-LINK          Digital Audio (DVI: Digital                                               IEEE1394
      Connect an                            Visual                                              Connect                           Remote Control Port
                          Interface/Component2)                                 RS-232C         DVHS or                           Connect your wired            CABLE Inputs
      IR controller
                                             Input/                            INPUT (CON-      MicroMV to                        remote control here.           Connect cable
      to this jack.
                             Digital Audio Output                              TROL/SER-        IEEE1394                               CableCARD              signals to the TV,
                       Connect digital audio from                              VICE) PORT       Connector.                             Used for                either directly or
                      various types of equipment.                              Connect to the                                          CableCARD                   through your
                           Note: In standby mode,                              RS-232C port                                            received Cable                 cable box.
                         these ports will not work.                            on a PC.                                                Service Provider.


                            HDMI /             DIGITAL AUDIO(OPTICAL)
                            DVI(VIDEO)
                                         DVI                      COMPONENT2

                           AUDIO INPUT                 VIDEO INPUT                                                                            Cable
                                                                                                                                          ANTENNA          CABLE




                                                                                                                                                                       AC INPUT




                                DVD/DTV Input                                                                      Antenna Inputs
                              (Component 1-2)                                        Monitor Output                Connect antenna sig-
                          Connect a component                                      Connect a second                nals to the TV, either
                           video/audio device to                                        TV or Monitor.             directly or through
                                    these jacks.                                                                   your cable box.
 RGB/AUDIO                                                              Audio/Video Input         S-Video Input
 INPUT                HDMI/DVI(VIDEO)                                                             Connect S-Video out
                                                                        Connect audio/video
 Connect the moni-    Connect a                                                                   from an S-VIDEO
                                                                        output from an exter-
 tor output connec-   HDMI/DVI(Video)                                                             device to the S-
                                                                        nal device to these
 tor from a PC to     signal to this jack.                                                        VIDEO input.
                                                                        jacks.                                                      Power Cord Socket
 the appropriate                                                                                This TV operates on an AC power. The voltage is indi-
 input port.                                                                                  cated on the Specifications page. Never attempt to oper-
                                                                                                                               ate the TV 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 TV.

                                        LIGHT                                                              MODE
        Illuminates the remote control buttons.                                                            Selects the remote operating mode: TV,
                                                                                                           VCR, DVD, CABLE, HDSTB or AUDIO.
                                    TV/VIDEO                                                               Select other operating modes, for the
     Selects: DTV, Analog, Video, Front Video,                                                             remote to operate external devices.
     Component 1-2, RGB-DTV (or RGB-PC),                                                                   POWER
                     HDMI/DVI input sources.                                                               Turns your TV or any other programmed
                                                                             MODE
                          COMP/RGB/HDMI                    LIGHT                              POWER
                                                                                                           equipment on or off, depending on mode.
  Selects: Component 1-2, RGB-DTV (or RGB-                TV/VID
                                                                  EO     COMP/RGB/HDMI        1394
                                                                                                           1394
               PC), HDMI/DVI input sources.
                                                                                                           FLASHBK
                             NUMBER buttons
                                                                                                           Tunes to the last channel viewed.
                                      DASH                                                                 SURF
  Used to enter a program number for multiple                                               FLASHBK
                                                                                                           Use to scroll the Surf channel.
       program channels such as 2-1,2-2,etc.
                                                                                                           CHANNEL UP/DOWN
                                        MUTE             MUTE                                  SURF        Selects available channels found with EZ
                                                                                    PGUP
                   Switches the sound on or off.                       VOL          CH                     scan.
                                                                                    PGDN

                        VOLUME UP/DOWN                                                                     PAGE UP/PAGE DOWN
       Increases/decreases the sound level.                             SAP     RATIO                      Moves from one full set of screen infor-
                                                         INFO                                      CC      mation to the next one.
                                        INFO
 When you watch the TV, displays information                                                               RATIO
        on top of the screen. Not available in                                                             Changes the aspect ratio.
  Component 1-2, RGB and HDMI/DVI mode.                                                                    CC
                                                                          ENTER
                                                                                                           Select a closed caption:
                                          SAP                                                              Off, CC1~4, Text1~4.
  Selects MTS sound: Mono, Stereo, and SAP                                                                 EXIT
  in Analog mode. Change the audio language              MENU                                  EXIT
                                                                                                           Clears all on-screen displays and returns to
                                                                       TV GUIDE TIMER
                                 in DTV mode.                                                              TV viewing from any menu.
  THUMBSTICK (Up/Down/Left/Right/ENTER)                   PLAY         PAUSE    STOP          RECORD
                                                                                                           TIMER
  Allows you to navigate the on-screen menus
                                                          REW            FF                                Lets you select the amount of time before
   and adjust the system settings to your pref-                                     DAY -          DAY +

                                                                                                           your TV turns itself off automatically.
                                       erence.                                              SKIP

                                                           PIP         PIPCH-   PIPCH+        PIPINPUT     VCR/DVD BUTTONS
                                       MENU
                                                                                                           Control some video cassette recorders or
       Brings up the main menu to the screen.            VIDEO         SOUND    SIGNAL         SWAP
                                                                                                           DVD player ("RECORD" button is not avail-
                                 TV GUIDE                ADJUST        FREEZE   ZOOM                       able for DVD player).
 Brings up the TV Guide On Screen system to
                                                                                                           DAY+/DAY-
                                the screen.                                                                Moves forward of backwards in 24 hour
                                         VIDEO                                                             increments in the Listings Grid.
              Adjusts the factory preset picture                                                            PIP
                        according to the room.                                                              Switches between PIP, POP (Picture-out-of-
                                      ADJUST                                                                Picture) and Twin picture modes.
            Adjusts screen position, clock, and                                                            PIPCH-/PIPCH+
                           phase in PC mode.                                                               Changes to next higher/lower PIP channel.
                                      SOUND                                                                PIP INPUT
                 Selects the sound appropriate                                                             Selects the input source for the sub picture.
                   for the program's character.
                                                                                                           SWAP
                                       SIGNAL                                                              Exchanges the main/sub images in
           Displays the digital signal strength.                                                           PIP/Twin picture mode.
                                       FREEZE                                                              ZOOM
Freezes the currently-viewed picture. Main pic-                                                            Enlarges the main picture size.
      ture is frozen in PIP/Twin picture mode.




                                                                        - 6 -
                                   ADJUSTMENT INSTRUCTIONS

1. Application Object                                                4. Gemstar VBI Micom Download
 These instructions are applied to all of the PDP TV, AF-044P.
                                                                     4-1. Preparation for Adjustment
                                                                         (1) As shown below, connect the MPLAB ICD2 equipment, PC
                                                                            and Digital Connector.
2. Notes                                                                 (2) Turn on the MPLAB ICD2 POWER Supply.
 (1) Because this is not a hot chassis, it is not necessary to use       (3) After turn on the PC and MONITOR, select the `MPLAB
    an isolation transformer. However, the use of isolation                 IDE' from the screen.
    transformer will help protect test equipment.
 (2) Adjustments must be done in the correct order.
 (3) The adjustments must be performed in the circumstance of                                                                        +13V

    25



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