Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_42PX7DC_AF-05PA_[SM]

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LG_42PX7DC_AF-05PA_[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-05PA

MODEL : 42PX7DC 42PX7DC-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




                            INPUT   ENTER
                                            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


SPECIFICATIONS.................................................................8


ADJUSTMENT INSTRUCTIONS ..........................................9


BLOCK DIAGRAM...............................................................15


EXPLODED VIEW...............................................................18


EXPLODED VIEW PARTS LIST .........................................19


REPLACEMENT PARTS LIST ............................................20


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


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




                                                                               - 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




                                                                                INPUT   ENTER




                                                 INPUT   MENU   ENTER     VOL                       CH




                                  POWER Button              ENTER Button                        CHANNEL (E,   D)   Buttons

                                          INPUT Button
         Remote Control Sensor
                                                                        VOLUME (F,G) Buttons
                                                   MENU Button




                                                           - 4 -
                               DESCRIPTION OF CONTROLS


      Connection Options

                                            Back Connection Panel



HDMI IN 2
                     M.P.I.

  2     ANTENNA IN
      ANTENNA         M.P.I.
                                                                                                                   S-VIDEO IN




                                                                                          AUDIO R
                                                                                                                     AUDIO IN




                                                                                          L /MONO
                                                                                          VIDEO
ANTENNA IN                                                                                                           VIDEO IN




                                                                                  AV IN 1
                                              DIGITAL AUDIO OUT                                              COMPONENT IN
                                                   OPTICAL




                                HDMI1/DVI IN
                                                              SERVICE
                                                              ONLY
                        RJP INTERFACE


                                INTERFACE       1              SERVICE ONLY
                                                    OPTICAL




                                                                                                             AUDIO IN(RGB/DVI) SPEAKER OUT(8 )



                                                                                  RESET             UPDATE                                       AC IN




                                                                           UPDATE         AC IN
                                                               AUDIO IN
                                                              (RGB/DVI) RESET
                                                                                RGB IN SPEAKER
                                                                              (PC/DTV)     OUT

                                                                              REMOTE CONTROL OUT




                                                         - 5 -
                              DESCRIPTION OF CONTROLS


          Remote Control Key Functions
- When using the remote control, aim it at the remote control sensor on the TV.




                                  MODE                                                   INDICATOR LIGHTS
    Select the remote oper ting mode: TV,                                                Show active remote mode every time
          VCR, Cable, DVD and Satellite.           TV        VCR CABLE DVD HDSTB
                                                                                         any button is pressed.

                                                    MODE          INFO        POWER
                                      INPUT
    External input modes rotate in regular
 sequence: Tuner, AV1, AV2, Component,              INPUT    MULTIMEDIA EZ PIC           INFO
    RGB1, RGB2, HDMI1/DVIand HDMI2                                                       Display information t the top of the screen.
                             input sources.        ADJUST      SIGNAL         EZ SOUND
    (AV1, AV2, Component input sources
 are linked automatically, only if these are
                               connected )
                                                        1         2             3
                                                                                          EZ PIC
                      NUMBER KEYPAD                     4         5             6         Selects a factory preset picture mode
          For direct channel selection and                                                depending on the viewing environment.
                   programming functions.               7         8             9
                                                                  0            FLASHBK
                                                                                          FAV
                                  MUTE
                                                   MUTE                           FAV     Scrolls the Favorite channels.
             Switches the sound on or off.
                                                                  +
                                                    SAP                          TIMER
                                                            VOL          CH               TIMER
                                                                                          Lets you select the amount of time
                VOLUME UP/DOWN                       PIP    PIPCH- PIPCH+ SWAP            before your TV turns itself off automati-
          Increases/decreases the sound                                                   cally.
                                   level.

                                 RATIO                       CC    FREEZE PIP INPUT      PIP INPUT
                                                   RATIO
     Changes the screen format or aspect                                                 Selects the input source for the sub
                                   ratio.                                                picture.




                                                                                         ENTER
                                                                                         When in the menu system and other
                                MENU                                                     on-screen displays, selects highlighted
          Brings up the main menu to the           MENU                           EXIT
                                                                                         options.
                                screen.

                                                   PLAY PAUSE STOP RECORD
                                                                                         EXIT
                                   SKIP                                                  Clears all on-screen displays and returns
                                                    REW      FF                          to TV viewing from any menu.
             Playing CDs: Selects songs.
   Playing DVDs: Selects movie chapters.
                                                                          SKIP




                                                              - 6 -
                           DESCRIPTION OF CONTROLS

       Remote Control Key Functions


                        MULTIMEDIA
Selects: RGB1-2,HDMI1/DVI, HDMI2 and
             Component input sources.                                               POWER
                                              TV        VCR CABLE DVD HDSTB         Turns your TV or any other programmed
                                                                                    equipment on or off, depending on mode.
                                               MODE          INFO        POWER


                                              INPUT     MULTIMEDIA EZ PIC
                                                                                    EZ SOUND
                                ADJUST
                                                                                    Selects the sound appropriate for the pro-
       Adjusts screen position, size, and     ADJUST      SIGNAL         EZ SOUND   gram's character.
                     phase in PC mode.


                                                   1         2             3        FLASHBK
                                  SIGNAL                                            Tunes to the last channel viewed.
      Displays the digital signal strength.        4         5             6
                                                   7         8             9
                                                                                    CHANNEL UP/DOWN
                                                                                    Scrolls through available channels in
                                                             0            FLASHBK
                                                                                    EZ Scan memory.
                                 SAP          MUTE                           FAV
 Selects MTS sound: Mono, Stereo, and                        +
 SAP in Analog mode. Change the audio
                language in DTV mode.         SAP                           TIMER   SWAP
                                                       VOL          CH              Exchanges the main/sub images in
                                                                                    PIP/Twin picture mode.
                                               PIP     PIPCH- PIPCH+ SWAP
                                   PIP
   Toggles between PIP and Twin picture
                                mode.
                                                                                    PIPCH+
                                                        CC    FREEZE PIP INPUT      Changes to next higher PIP channel.
                                              RATIO
                               PIPCH-
      Changes to next lower PIP channel

                                                                                    FREEZE
                                                                                    Freezes the currently-viewed picture.
                                       CC                                           Main picture is frozen in PIP/Twin picture
   Selects a closed caption mode for dis-                                           mode.
   playing captioning information if avail-
                        able on program.      MENU                           EXIT



                                              PLAY PAUSE STOP RECORD                RECORD, PAUSE, REW, FFWD,
                          THUMBSTICK                                                PLAY, STOP
    Allows you to navigate the on-screen                                            Control the functions on your VCR.
 menus and to adjust the system settings      REW       FF
 and preferences, by moving to an option
         D
   withF E G and selecting the highlighted                           SKIP
                            option with .




                                                         - 7 -
                                      SPECIFICATIONS


        MODELS
                                                               42PX7DC
                                                             ( 42PX7DC-UA )

   Width (inches / mm)                                            46.7 / 1186

   Height (inches / mm)                                           27.6 / 654.7

   Depth (inches / mm)                                            25.8 / 119.5

   Weight (pounds / kg)                                           58.9 / 26.7

        Resolution                                              1024x768 (Dot)

    Power requirement                                      AC100-240V~ 50/60Hz

    Television System                                NTSC-M, ATSC, 64 & 256 QAM

    Program Coverage                VHF 2 ~ 13, UHF 14 ~ 69, CATV 1 ~ 135, DTV 2 ~ 69, CADTV 1 ~ 135

External Antenna Impedance                                        75 

Operating Temperature Range                               32 ~ 104



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