Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor LG_50PX4DR_[SM]

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LG_50PX4DR_[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-05FA

MODEL : 50PX4DR 50PX4DR-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




                             POWER   TV GUIDE
                                            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


PRINTED CIRCUIT BOARDS .............................................18


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


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


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


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


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




                                                                               - 3 -
                                 DESCRIPTION OF CONTROLS

         Controls
W   This is a front panel of 50PX4DR series TVs.
- This is a simplified representation of front panel.
  Here shown may be somewhat different from your TV.



                                         Front Panel Controls




                                                                                                                          INDEX
                                                                                                                          Switches
                                                                                                                          LED Display
                                                                                                                          on or off.
                                                                               TV GUIDE




                                                        TV GUIDE




                                                                        CHANNEL (E,       D)   Buttons

                                                                    VOLUME (F,G) Buttons            Power Standby Indicator
                                                                MENU Button                         Blinks orange in standby mode,
                                                             TV/VIDEO Button                        blinks green when the TV is
                                                                                                    turned on.
                                                  TV GUIDE Button
                                   Remote Control
                                   Sensor
                                            POWER Button




                                                                   - 4 -
                                         DESCRIPTION OF CONTROLS

            Connection Options
W   This is a back panel of 50PX4DR series TVs.


                                                      Back Connection Panel

                                                                                                                                                               S-VIDEO Input
                                                                                                                                     FRONT
                                                                                                                                                               A connection is available to provide
                                                                                                                                   A/V INPUT
                                                                                                                                         S-VIDEO
                                                                                                                                                               better picture quality than the video
                                                                                                                                                               input.




                                                                                                                              VIDEO
                                                                                                                                                               VIDEO Input
                                                                                                                                                               Connects the video signal from a




                                                                                                                              L / MONO
                                                                                                                                                               video device.




                                                                                                                              R AUDIO
                                                                                                                                                               AUDIO Input
                                                                                                                                                               Connections are available for listening
                                                                                                                                                               stereo sound from an external device.

Memory Card Slots



                                             RGB/AUDIO INPUT
                                             Connect the monitor output                                                                                                                   Remote Control Port
         IEEE1394
                                             connector from a PC to the                                                                                                                   Connect your wired
         Connect DVHS or
                                             appropriate input port.                                                                                                                      remote control here.
         MicroMV to IEEE1394
         Connector.
                                                                                                              DVD/DTV Input
                                                                                                              (Component 1-2)                                  S-Video Input
                                   RS-232C INPUT (CON-                                                     Connect a component                                                                                 Antenna Input
                                                                                                                                                               Connect S-
      G-LINK    TM                TROL/SERVICE) PORT                                                       video/audio device to                                                                               Connect over-the-
                                                                                                                                                               Video out from
      Connect an IR               Connect to the RS-232C                                                        these jacks.                                                                                   air signals to this
                                                                                                                                                               an S-VIDEO
      controller to this          port on a PC.                                                                                                                                                                jack.
                                                                                                                                                               device to the S-
      jack.                                                                                                                                                    VIDEO input.


                                                                  RS-232C INPUT
                                                              (CONTROL/SERVICE)


                                                                                                                              VIDEO                AUDIO        VIDEO     AUDIO
                                                      OUTPUT
        Cable                                                                                                                                                                                                                    AC INPUT
                                                                                                                                                   L       R             L            R
                                          HDMI 2                                                                                   COMPONENT INPUT 2               MONITOR OUTPUT
                                                     COMPONENT2      DIGITAL AUDIO (OPTICAL)
                             IEEE-1394               INPUT                                                            DVD
                                                                                                                                                                                                     REMOTE    CABLE   ANTENNA
                                                                                                                      /DTV
                                                                                                            AUDIO     INPUT                                                                          CONTROL
                                         HDMI1/DVI                                             RGB INPUT
                                                                                                            INPUT                                                            (MONO)
                                                       DVI                                                                        COMPONENT INPUT 1                     A/V INPUT          S-VIDEO
                                                      INPUT




     CableCARDTM                          Digital Audio (DVI: Digital                                                                                               Monitor Output
     Used for                             Visual                                                                                                                    Connect a second
     CableCARDTM                          Interface/Component2)                                                     Audio/Video Input                               TV or Monitor.
     received from Cable                  Input/                                                                    Connect audio/video
     Service Provider.                    Digital Audio Output                                                      output from an                       CABLE Input
                                          Connect digital audio from                                                external device to   Connect cable signals to this
                     HDMI1/DVI, HDMI 2 various types of equipment.                                                                      jack, either directly or through
                                                                                                                    these jacks.
                     Connect a HDMI sig- Note: In standby mode,                                                                                             a cable box.
                     nal to HDMI1/DVI or these ports will not work.
                     HDMI2. Or connect a                                                                                                                                   Power Cord Socket
                     DVI(Video) signal to                                                                                                      This TV operates on an AC power. The voltage
                     HDMI1/DVI.                                                                                                                 is indicated on the Specifications page. Never
                                                                                                                                                       attempt to operate the TV on DC power.


Note:
- After removing the cover, you can insert the CableCARDTM or connect to the G-LINK jack.




                                                                                                           - 5 -
                              DESCRIPTION OF CONTROLS

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




                                      POWER                                                              VCR/DVD BUTTONS
       Turns your TV or any other programmed                TV INPUT                          TV/VIDEO
                                                                                                         



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