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2008_Troubleshooting-Guide_Standard-HD_080424


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      Technical Guide
                     Plasma
               (GPH11DU Chassis)
                   HD Models
            Troubleshooting Handbook


Model : TH-42PX80U
        TH-50PX80U




Panasonic Technology and Service Company
                 National Training
This page is purposely left blank.




                2
                                        Table of Contents
Subject                                                Page        Subject                                               Page
Connector's Location (TH-42PX80U)                      5           No Picture\No OSD                                     28
Power LED's Response to Shutdown Operation             7           No Sound                                              29
LED blinks 1 time                                      8           Troubleshooting for Picture Problems                  31
LED blinks 2 times                                     9           Diagnostic Method for Troubleshooting PDP             32
                                                                   Television
LED blinks 3 times                                     10
                                                                   Troubleshooting for Picture Trouble                   33
LED blinks 4 times                                     11
                                                                   Diagnosis for Picture Problem (All Over the Screen)   34~36
LED blinks 5 times (Quick Troubleshooting)             12
                                                                   Diagnosis of Vertical Line Problem                    37
LED blinks 5 times                                     13
                                                                   Picture Trouble at Upper or Lower half                38
LED blinks 6 times                                     14
                                                                   Picture Trouble at Right or Left half (50 Inch)       39
SU/SD Board Isolation Procedure                        15
                                                                   Picture Trouble at Right or Left half (42/37 Inch)    40
LED blinks 7 times                                     16
                                                                   Picture Trouble in 50 Inch Models                     41
LED blinks 8 times                                     17
                                                                   Picture Trouble all Over the Screen                   42
LED blinks 9 times                                     18
                                                                   Examples of Symptoms and Remedies                     44~49
LED blinks 10 times before pressing the power button   19-20
                                                                   Self-check Procedure                                  50
LED blinks 10 times after pressing the power button    21-22
                                                                   Reset                                                 51
LED blinks 12 times                                    23
                                                                   Driver Setup Adjustment                               52~53
LED blinks 13 times                                    24
Dead part I                                            25-26
No Picture from one or all inputs (OSD and Sound OK)   27




                                                               3
                                 Introduction


1. Basic concept of how to determine the defective board
 1) Verification of voltages
    Normally, when there is a power problem, shutdown occurs immediately.
    So, to resolve a power problem, voltage checks are necessary before shutdown.
 2) Check if the power comes up after disconnecting the board under suspicion.
    If power comes up (*) after disconnecting a board, the board is defective.
    (*) "Power comes up" equals "no shutdown".
2. Troubleshooting Video and Audio problems
3. Examples of video problems
4. Adjustment after PCB exchange
 1) After exchanging the following boards, voltage adjustment is required.
    P board, SC board, SS board => Please refer to the "Service Manual".



                                          4
Connector's Location (TH-42PX80U)




                5
1. Troubleshooting Shutdown Problems


  CAUTION: Some steps requires removal of connectors and
  sometimes PC boards removal. Do not let the TV run for more
  than 30 seconds while connectors or boards are disconnected.




                               6
     Power LED's Response to Shutdown Operation
                Once               
                              3.0sec (interval)                       Light

                                                                      No Light
      LED
     Blinking                Contents                                  Check Point
      times

        1        STB5V sense time out                  A Board
        2        15V line abnormality                  A Board (15V SOS)
        3        3.3V line abnormality                 A Board (3.3V SOS)
        4        Power Supply abnormality              P Board (Power SOS)
        5        5V line abnormality                   A Board (5V SOS)
                 Scan Driver (1)                       SC,SU,SD Board (SC Energy recovery circuit)
        6        abnormality/DRV_RST                   C and A Boards Connections
        7        Scan Driver (2) abnormality           SC,SU,SD Board (SC Floating voltage area)

        8        Sustain Driver abnormality            SS Board (SS Energy recovery circuit)/Panel
        9        Panel Status abnormality              A Board (Panel Status DET)

       10        REG. voltage abnormality              A Board (A SOS, Tuner SOS)/SC/SS
       12        Voltage for sound abnormality         A Board (Sound SOS), C boards connections
        13       Communication error with IC8001       A Board


                                                   7
                                            LED blinks 1 time

                                                                   Warning: Disconnect AC Power prior to
     Trouble Mode                            Defective Board           making any disconnection or
  Communication Error                               A, GS
                                                                               connection.


    Disconnect GS52 on the SD Card Slot Board (GS board )
    (See Figure 1). Plug in the TV and turn it on




           No             Is the power       Yes
                            LED still
                            blinking?




    Replace the GS                           Replace the A
        board                                   board




                                                                            Figure 1




                                                               8
                                                LED blinks 2 times
                                                            Warning: Disconnect AC Power prior to making any
                                                                                              disconnection or connection
      Trouble Mode                       Defective Board (Possibility)                        (*1) = The reference number of the sustain data
                                                                                              connector is different in some of the models:
       15V down SOS                          P, A, SC, SS Board (P > A, SC, SS)
                                                                                              TH-42PX80U = SS23
                                                                                              TH-50PX80U = SS23

                                         Unplug the TV and disconnect CN SC20 and SC2.        (*2) CAUTION: Before connecting P2/SC2 or
                                         To isolate the SC board. Re-connect the TV and       P11/SS11, discharge is necessary to prevent
                                         turn the power on.                                   potential shock caused by VSUS.




                      Does the        No
            Yes
                       power
 SC Board
                      LED stay
                        on?
                                                                                        Is there
                                                                                      15V output
                                                                                      at CN P25
                                                                             Yes                       No
                                                                                       pin 1 or 2                   Unplug the TV.
       Unplug the TV, reconnect SC20 and (*2)
                                                                                       before the                 Disconnect CN P25.
       SC2 and disconnect CN P12 from the P
                                                        Unplug the TV,                 TV shuts
       board and SS11 and SS23 (*1) from the
                                                        Re-connect CN                   down ?
       SS board to isolate the SS board.
       Remove the jumper at CN SS34 and                P12, SS11, SS34,
       install it across pin 8 and 10 of connector      and SS23 (*1).
       P12. Plug in the TV and turn the power on.       Turn the TV on.
                                                                                                                  Is pin 1 or 2
                                                                                                    Yes            of the CN          No
                                                                                                          Is pin 1 or 2 of the CN P25
                                                                                                                  P25 shorted
                       Does the                                                                                 shorted to GND?
                                                                                                                    to GND?
            Yes         power           No
                       LED stay
                         on?
   SS Board                                                               A Board            P Board                                A Board


Note: CN = Connector
                                                                      9
                         LED blinks 3 times

                                                  Warning: Disconnect AC Power prior to
     Trouble Mode          Defective Board            making any disconnection or
    3.3V down SOS              A Board
                                                              connection.







                        Replace the A board




Note: CN = Connector
                                             10
                    LED blinks 4 times (TH-42PX80U)

                                                                      Warning: Disconnect AC Power prior to
     Trouble Mode                  Defective Board                        making any disconnection or
   Power Supply SOS      Primarily P board or possible A board
                                                                                  connection.



                                               Turn the TV on.




                                                    Is pin
                                                12 of CN P25
                                     Yes                         No
                                                  on the P
                       P Board                                               A Board
                                                 board high
                                                before the TV
                                                shuts down?




Note: CN = Connector
                                                     11
         LED blinks 5 times (Quick Troubleshooting)
                                                   Warning: Disconnect AC Power prior to making any
                                                                                     disconnection or connection
     Trouble Mode                       Defective Board                              (*1) = The reference number of the sustain data
                                                                                     connector is different in some of the models:
       5V SOS             P, C, SC, SS board or Panel (DDIC)*1                       TH-42PX80U = SS23
                                                                                     TH-50PX80U = SS23

                                                                                     (*2) CAUTION: Before connecting P2/SC2 or
                                                   P11/SS11, discharge is necessary to prevent
                                                                                     potential shock caused by VSUS.


                               Disconnect CN P12 of the power supply board.
                                 Measure the resistance of pin 1 of the lead
                                             cable to ground.




                                     Yes        Is there a        No           Proceed to more extensive troubleshooting
                       Panel                     short to
                                                                                        of the slides that follow.
                                                 ground?




Note: CN = Connector
                                                             12
                               LED blinks 5 times (TH-42PX80U)
       Trouble Mode                             Defective Board
             5V SOS                      P, C, SC, SS board or Panel

                     Disconnect CN SC20 on the SC
                    board. Plug in the TV and turn it on
                                                                      Connect
                                                                 CN SC20. Disconnect                                          Yes     Does the     No
                                                                 CN SS23 (*1) on the                                                   power
       Connect                   Does the                                                                    SS Board
                      Yes                       No               SS board. Plug in the                                                LED stay
      SC20 and                    power                                                                                                 on?
                                                                   TV and turn it on
      disconnect                 LED stay
      CN SC46.                     on?
                                                                                                          Connect SS23 (*1).
                                                                                                  Disconnect CN 31and A32 on the A
                         SC Board
                                                                                                   board. With the TV disconnected
Yes      Does the                                                                                measure continuity between pin 5 of CN
                         No                                   Connect A31                                   P25 and GND
          power
         LED stay                                            and leave A32
           on?                                               disconnected.
                                  Is pin 5 of    No
                        Yes        CN P25                                         Is pin 5 of   No
                                                                      Yes          CN P25
                                                                                                        Disconnect
SD Board                            shorted                                                              A31 and                    Is pin 5 of
                                                                                    shorted                                   Yes                  No
  (See SD                          to GND?                                                             connect A32.                  CN P25
   board                                                                           to GND?                                            shorted
 Isolation                                                       Disconnect                                                          to GND?
procedure                                                        CB1-CB4.
  on slide      Disconnect                                                                                        Disconnect
                 CN P25.                                                                                                                          P Board
    15)                                                                                                           CB5~CCB8

                                                           Yes      Is pin 5 of
                                                                     CN P25
                                                                                       No
                 Is pin 5 of                                          shorted                            Yes          Is pin 5 of   No
   Yes                                  No                                                                             CN P25
                the socket                                           to GND?
                P25 shorted                                                                                             shorted
                  to GND?                                                                                              to GND?
 P Board                            A Board        C1 Board                                          C2 Board                            Panel
                                                                                       Panel

  Note: CN = Connector
                                                                                  13
                                               LED blinks 6 times
                                                                                          Warning: Disconnect AC Power prior to making any
      Trouble Mode                       Defective Board (Possibility)                    disconnection or connection
                                                                                          (*1) = The reference number of the sustain data
SC Energy Recovery SOS                     SC, A, P Board (SC >A> P )                     connector is different in some of the models:
                                                                                          TH-42PX80U = SS23
                                                                                          TH-50PX80U = SS23

                Disconnect                                                                (*2) CAUTION: Before connecting P2/SC2 or
        connectors SC2, and SC20                                                          P11/SS11, discharge is necessary to prevent
        from the SC board. Plug in                                                        potential shock caused by VSUS.
           the TV and turn it on.                                                         (*3) VSUS about 180V (Accurate voltage is provided
                                                                                          on the Panel Label)
                                                                                          (*4) Place a jumper across pin 8 and 10 of connector
                                                                                          P12. The unit will not enter the standby mode without
        Yes     Does the       No                                                         the jumper.
                                            Connect SC2 (*2) and
                TV power
                                            SC20. Plug in the TV
                 up and
                                               and turn it on.
                 stay on?


                                                                          Does the P
                                                                          board output
 SC Board                                                                                       No
                                                          Yes           15V at pin 1 of
                                                                        P7 and Vsus at                        P Board
                                                                        pin 1 of CN P2
                                                                         before the TV
                                                                         shuts down?

                                       Clean and reseat the ribbon
                                     cables between the A and the C
                                      boards. Also reseat the cables
                                        between the C boards. If
                                     problem persists, replace the A
                                                  board




Note: CN = Connector
                                                                       14
                       SU/SD Board Isolation Procedure
Unlike previous models of Panasonic Plasma TVs, the 2008 models are designed not to turn-on if either of the SU and
SD boards is disconnected. Disconnecting either causes the unit to shutdown and the power LED to blink 7 times.
  Procedure to isolate the SU/SD board
  For SU board: Disconnect connectors SC41/SU41, SU11/SD11.

  For SD board: Disconnect connectors SC42/SD42, SC46/SD46, and
  SU11/SD11.

  Isolating the SU/SD board does not require the removal of its mounting
  screws.

  Place a jumper between "VF Ground" (labeled H.V. DANGER) on the SU
  board or SD board and coil L801 on the SC board, see figure 2 and 3.

  The jumper can be connected to the floating ground screws on the SU
  board, which are located above and below connector SU41, see figure 2.

  Caution: Before turning the unit on, confirm that the jumper is not
  connected to a chassis ground screw, as this will cause severe damage
  to the unit. Confirm proper connection by measuring continuity
  between floating ground and chassis ground. The resistance should be
  in the kilo-ohms range.




                                                                                     Figure 3
                            Figure 2

                                                                    15
                          LED blinks 7 times (TH-42PX80U)
     Trouble Mode                   Defective Board (possibility)                    Physically disconnect the SU board and the
                                                                                      SD board. (See instructions on slide 15).
SC Floating voltage SOS         SC, SU, SD, P board (SC,SU,SD>P)                            Plug in the TV and turn it on.

Make sure the connectors P2/SC2, SC20/D20
are not loose and are seated properly.

                                                                       Does the
                                                                                                  With the SU board and the SD board
           Reconnect the SD board only.                No           TV shut down        Yes       still disconnected, remove connectors
           (See instructions on slide 15).                          and the power
                                                                                                    SC2 and SC20 from the SC board
            Plug in the TV and turn it on.                               LED
                                                                                                         Plug in the TV and turn it on.
                                                                    blink 7 times?



                      Does the
      No                               Yes
                   TV shut down
                   and the power                                                                                Does the
                        LED                                                                      No          TV shut down          Yes
                   blink 7 times?                                                                            and the power
                                                                                                                  LED
                                       Disconnect the SD board and                                           blink 7 times?
Replace the SU
board.                                 reconnect the SU board. (See
                                       instructions on slide 15). Plug
                                          in the TV and turn it on.
                                                                                     Replace the SC board.                Replace the A board.



                                                  Does the
                                    No         TV shut down          Yes
                                               and the power
                                                    LED
                                               blink 7 times?


                   Replace the SD board.                        Replace the SD, and SU
                                                                board.



                                                                         16
                                               LED blinks 8 times
       Trouble Mode                       Defective Board (possibility)
SS Energy recovery SOS/Panel                   SS, A board (SS>,A)/PDP
                           Disconnect
                       CN SS23 from the SS
                       board. Plug in the TV
                          and turn it on



                             Does the                                    No
                 Yes                           No                             P Board
                             TV power
                              up and
                              stay on?



                                         A Board




               Yes        Is the anode         No
                           of D280 on
                         the SS board
                              high?

       Panel
                                                    SS Board




                                                                                        Figure 4



                                                                17
                         LED blinks 9 times

                                                  Warning: Disconnect AC Power prior to
     Trouble Mode          Defective Board            making any disconnection or
     Panel Status              D Board
                                                              connection.





                        Replace the A board.




                                             18
     The power LED blinks 10 times at plug-in (TH-42PX80U)
 Trouble Mode        Defective Board (Possibility)            NOTE: When taking voltage reading, place your meter's probe on the
                                                              test point or pin indicated before connecting the TV to the AC line. The
 Dead/No power                   P, A, GS, K                  voltage you intent to measure may only appear for a brief moment.


Warning: Disconnect AC                                                     NO            Do the AC relays          Yes
Power prior to making any                                                          click after the TV is plugged
disconnection or connection.                                                              into the AC line?
                                           NO
                                                               Is                Yes
                                                         there 3.2V at
                                               pin 6 of connector P7 when the
                                                      TV is plugged into
                                                          the AC line?
                                                                                                          Replace
                                                                                                        The P board
NO               Disconnect
         connector A1 on the A board.        Yes
          Do the AC relays click after
            the TV is plugged into
                  the AC line?
                                                              If cable between connectors K1
                                                            and A1 is OK, Replace the K board.




                                     Reconnect
             NO                 A1 and disconnect              Yes
                           connector A51on the A board.
                            Do the AC relays click after
                              the TV is plugged into
                                    the AC line?                         If cable between connectors GS52 and            Go to the
                                                                             A51 is OK, Replace the GS board.            Next slide
       Replace
     The A board


                                                                    19
       The power LED blinks 10 times at plug-in (TH-42PX80U)
NOTE: When taking voltage reading, place your meter's probe                      Warning: Disconnect AC                        Continue from the
on the test point or pin indicated before connecting the TV to the              Power prior to making any                        previous slide
AC line. The voltage you intent to measure may only appear for                 disconnection or connection.
a brief moment.



                                                                               Is
                        Disconnect                                                                              Disconnect
                      connector P6 on
                                                        No               there 15V at           Yes          connector A1 on
                                                               pin 7 of connector P6/A7 when
                     the P board. Plug                                                                         the A board.
                                                                   the TV is plugged into
                         in the TV                                                                            Plug in the TV
                                                                          the AC line?




        No           Is there 15V at pin 7        Yes                    Replace
                                                                                               No                                    Yes
               of connector P6/A7 when the TV                                                            Does the TV shut down?
                      is plugged into the                              the K board.
                            AC line?




                                                                                                                       Reconnect
   Replace                                        Replace                                                           connector A1 and
 The P board                                    The A board                                                       disconnect connector
                                                                                                                   A51on the A board.
                                                                                                                      Plug in the TV

                                                                             No                                  Yes
                                                              Replace the             Does the power LED still            Replace
                                                               GS board.                  blink 10 times?               The A board




                                                                      20
  LED blinks 10 times after pressing the power button (TH-42PX80U)
        Trouble Mode                                  Defective Board                          Warning: Disconnect AC Power prior to making any
                                                                                               disconnection or connection
    SUB 5V SOS, Main 3.3V SOS                                                                  (*1) = The reference number of the sustain data
                                                      P, A, SC,SS, GS, G Board                 connector is different in some of the models:
    DTV 9V SOS, Tuner Power SOS
                                                                                               TH-42PX80U = SS23
                                                                                               TH-50PX80U = SS23
    Disconnect connectors SC2 and SC20 on the
    Scan (SC) board. Plug in the TV and turn it on.                                            (*2) CAUTION: Before connecting P2/SC2 or
                                                                                               P11/SS11, discharge is necessary to prevent
                                                                                               potential shock caused by VSUS.
                                                                                               (*3) VSUS about 180V (Accurate voltage is provided
                                                                                               on the Panel Label)
      No            Does the unit shut         Yes                                             (*4) Place a jumper across pin 8 and 10 of connector
                      down and the                                                             P12. The unit will not enter the standby mode without
                    power LED blinks                                                           the jumper.
                       10 times?
                                                            Unplug the TV and re-connect CN SC2(*2), and SC20
                                                            on the SC board. Disconnect CN SS11(*2), SS23, and
                                                            SS34 on the SS board and CN P12 of the P board.
                                                            Install the jumper from SS34 between pin 8 and 10 of
                                                            CN P12. Plug in the TV and turn it on.
  Replace
The SC board



           Unplug the TV and re-connect CN SS11 (*2),              No         Does the power          Yes
           SS23 and CN SS34 on the SS board and CN                             LED stay on                             Replace
           P12 on the P board. Disconnect CN A51 and A52                      when the TV is                         The SS board
           on the A board. Plug in the TV and turn it on.                       turned on?




                                                                                                       Yes
                                                No             Does the power LED stay on
                    Go to the                                   when the TV is turned on?                                Go to the
                   Next slide (A)                                                                                       Next slide (B)
 Note: CN = Connector
                                                                         21
LED blinks 10 times before pressing the power button (TH-42PX80U)
                Continue from the                    Warning: Disconnect AC                                      Continue from the
                previous slide (A)                  Power prior to making any                                    previous slide (B)

                                                   disconnection or connection.

                                                                                        Unplug the TV and re-connect CN A52 on
                                                                                        the A board (Do not connect CN A1 yet).
   Unplug the TV and re-connect CN A52 and A1                                           Plug in the TV and turn it on.
   on the A board. (*5) Measure Vsus (*3) at pin
   1 of CN P11 and Vda (Approx. 75V) at pin 1 of
   CN P12. Plug in the TV and turn it on.



                                                                No                Does the power LED stay on
                                                                                                                                 Yes
                                                                                   when the TV is turned on?
         No                              Yes
                       Are
                   any of these                                                                                                 Replace
                                                         Replace
                     voltages                                                                                                 The G board
                                                       The GS board
                    missing?
                                                                      Warning: Disconnect AC Power prior to making any disconnection or
                                                                      connection
    Replace                            Replace                        (*1) = The reference number of the sustain data connector is different
  The A board                        The P board                      in some of the models:
                                                                      TH-42PX80U = SS23
                                                                      TH-50PX80U = SS23

                                                                      (*2) CAUTION: Before connecting P2/SC2 or P11/SS11, discharge is
                                                                      necessary to prevent potential shock caused by VSUS.
                                                                      (*3) Make adjustments according to the value provided on the label
                                                                      normally found above the SC board or the SS board
                                                                      (*4) Place a jumper across pin 8 and 10 of connector P12. The unit
                                                                      will not enter the standby mode without the jumper.
                                                                      (*5) = When measuring Vsus and Vda, make sure to place the
                                                                      meter's probe on the pin indicated before turning the TV on. This
                                                                      way, a voltage reading can be obtained before the TV shuts down.

Note: CN = Connector
                                                               22
                               LED blinks 12 times
Trouble Mode          Defective Board (Possibility)                              Warning: Disconnect AC Power
                                                                                prior to making any disconnection
Sound SOS                    Speakers, A Board
                                                                                          or connection.




                                     Disconnect the Left and Right
                                     speakers connectors. Plug in the TV
                                     and turn it on




                                               Does the power
                                  No            LED stay on
                                                                            Yes
                                               when the TV is
                                                 turned on?

                 Replace                                                         Check the speakers and
               The A board                                                         the speaker's wires.
                                                                             If the speakers and the wires
                                                                           are ok, check P15V (Pin 1 of P25)
                                                                            and follow 2 blinks instructions




                                                 23
                                  LED blinks 13 times

                                                          Warning: Disconnect AC Power prior to
      Trouble Mode                 Defective Board            making any disconnection or
Communication error with IC8001        A Board
                                                                      connection.





                              The A board is defective




                                                     24
                                              No Power/Dead Unit
Trouble Mode         Defective Board (Possibility)
Dead/No power                    P, A, GS, K               NO             Do the AC relays                    Yes
                                                                    click after the TV is plugged
                                                                           into the AC line?

 Yes             Is there 5V at
                                           NO                                                                   Place your meter
           pin 5 of connector A7/P7
                                                                                                              on pin 11 of connector
          when the TV is plugged into
                                                                                                                   A25 or P25.
                  the AC line?
                                           Unplug the TV

                                                           Check connection between P12 and
                                                           SS12. Also check for missing jumper on
                                                           CN SS34 on the SS board. If jumper on
        Yes               Yes
                     Is there continuity           NO      connector SS34 is present, replace the
                    between pins 8 and                     SS board.
                    10 of connector P12
                                                                                                                  Is there 3.2V         Yes
                      of the P board?                                                               NO
                                                                                                                 when the power
                                                                                                                     button is
                                                                                                                    pressed?
                Unplug the TV and disconnect
           connector A7. Place your meter on pin 5
           of connector P7. Plug in the TV and turn                        NO                 Does
                            it on.                                                      pin 6 of connector
                                                                                     A1 momentarily go from           Yes
                                                                                      4.5V to 0V when the
                                                                                         power button is
                     NO                                    Yes                              pressed?
                                Is there 5V when the
                                   TV is plugged in?



                                                                      If wiring connections
  Go to the               Replace                   Replace                                                Replace                   Replace
                                                                           are ok, check
  Next slide            The P board               The A board                                            The A board               The P board
                                                                         the S & K boards.


                                                                    25
                             No Power/Dead Unit (Continue)
Continue from
Previous slide




                                   Unplug the TV and
                                      disconnect
                                  connector A1. Plug in
                                                                    NO                      Is                Yes
                                                                                      there 3.3V at
                                        the TV.
                                                                            pin 6 of connector P7 when the
                                                                                   TV is plugged into
                                                                                       the AC line?
                                                                                                                              Replace
                                                                                                                            The P board
  NO         Do the AC relays click after     Yes
               the TV is plugged into
                     the AC line?




                                                                         If the cable between connectors K1 and A1 is OK,
                                                                                         Replace the K board.
         Reconnect A1 and
     disconnect connector A52.
          Plug in the TV.




                                                                          Yes
                   NO                Do the AC relays click after
                                       the TV is plugged into
                                             the AC line?

       Replace                                                                  If the cable between connectors GS52
     The A board                                                                 and A52 is OK, Replace the GS board.



                                                                          26
No Picture from one or all inputs (OSD and Sound OK)
                                                                                           Warning: Disconnect AC Power prior to
                                      Yes           Is there no            No                  making any disconnection or
                                                  picture from all                                     connection.
                                                      inputs?
                                                                                            Note: Slow leakage from the panel causes
                                                                                            "no raster and buzz noise"


          Disconnect
       CN A5, Plug in the                                                     Replace
        TV and turn it on                                                   The A board




 Yes                          No
          Does a white
            picture
           appears?


                                                Disconnect                                       Connect the
                                                                                            SU board. Disconnect
                                   Yes    the SU Board from the       No          Yes                                 No
                                       SC board. Turn the unit on. Is                 the SD Board from the SC board.
                                                                                              No
                                           there a picture at the                        Turn the unit on. Is there a
                                             lower half of the                             picture at the upper half
                                                 screen?                                        of the screen?.


                                                                                                                         SC
   Replace                    Replace                                        Replace                                 and possibly
 The A board                The SU board                                   The SD board                                 Panel.




                                                                     27
                                       No Picture\No OSD
                                                                                    Warning: Disconnect AC Power prior to
                                                                                        making any disconnection or
                                                                                                connection.
                     Yes            Is the On         No
                                 Screen Display
                                  information
                                     visible?
                                                                               Unplug the TV from the wall outlet.
                                                                               Disconnect connector A5 from the A board.
     Replace                                                                   Reconnect the TV and wait for it to come on by
   The A board                                                                 itself.




                                                                              No         Is the screen     Yes
                             Yes                                     No                   completely
                                        Is there 75V (VDA) at                                white?
                                          pins 1 and 2 of the
                                           connector SS12?

                                                                                                           Replace
                                                                                                         The A board
                                                                             Replace
        No       Is the SC Board LED
                                             Yes                           The P board
                      illuminated?




                                        No           Is the SS Board LED
                                                                              Yes
                                                          illuminated?



   Replace                Replace                                                           Replace
 The SC board           The SS board                                                      The A board

Note: CN = Connector
                                                                28
                                     No Sound
                                                                       Warning: Disconnect AC Power prior to
                                                                           making any disconnection or
                                                                                   connection.
                             No   Is there 15V at         Yes
                                  pin 1 of CN A7
                                      on the A
                                       board?



          Check the cable
         between connector
         A7 on the A board
          and P6 on the P
              board.

                                                    Yes          Is there a sound
                                                                                     No
                                                                waveform at pin 1
                                                                and 3 of CN A12
                                                                 on the A board?




                                   Check the speakers.
                                    (Make sure A12 is                                    Replace
                                     properly seated).                                 The A board




Note: CN = Connector
                                                    29
This page is purposely left blank.




                30
Troubleshooting for Picture Problems




                 31
Diagnostic Method for Troubleshooting PDP Television


    1. There are two kinds of picture problem
      1) Abnormal picture
      2) No picture
    2. Basic concept of determining the defective board
      1) Which area is the symptom displayed on the screen?
       A. Part of the screen
       B. All over the screen
    3. Adjustment after PCB exchange
      1) After exchanging the following boards, voltage adjustment is required.
        P board, SC board, SS board => Please refer to "Service Manual".




                                         32
                       Troubleshooting for Picture Trouble

    Start
                              Some part of the screen
    Where is                  Upper half                               *Note :Panel gas leakage
 the symptom                               SU Board (or A, or SC)
   displayed?
        Upper or Lower half   Lower half
        (from front view)                  SD Board (or A, or SC)

                              Both area
                                           SC Board (or A)
                                                                       Because of a very small crack in the
                                                                       panel, gas leakage will start.
                              Right half
                                                                       In this picture, gas leakage started at
       Left or Right half                  A Board (or C1, or Panel)   the left top corner.
       (from front view)                                               Finally, gas leakage will lead to the
                               Left half                               symptom "No picture with buzz
                                           A Board (or C2, or Panel)   noise".




                                                    33
               Diagnosis for Picture Problem (All Over the Screen)
                                                             
Abnormal Color, Vertical Line, Sync Error, Noise Picture              All Models






A Board, SC Board, SU Board, SD Board


e.g. TH-42PX80U                                                                 SC     SU                              SS


                                                                                              
                                                                                       SD
               IC1100   A       IC9500      IC9900
                 MICRO
                                  PICTURE
               PROCESSOR                    PLASMA AI
                                  OUTPUT
   IC4510                                                                                      Buffer IC   Buffer IC

                   Peaks           LVDS                            DATA
    HDMI I/F        Lite         RECEIVER   S.F. PROCESSOR                           Video DATA (R)
                                                                   DRIVER
                  IC8001 LVDS                                                        Video DATA (L)
                                DISCHARGE                Scan Control Pulse
                                 CONTROL                Sustain Control Pulse




                                                        34
              Diagnosis for Picture Problem (All Over the Screen)
                                                                          Sample of NG Waveform
Confirm the waveform at "TPSC1" of the SC board

                                                      
                         Correct Waveform
Waveform OK                                                    Waveform NG


                                                                                      Here
                                                       
                A Board defect                                               SC,SU,SD Board defect
                                                                                                   Refer to "Diagnosis (3)"
                                                               TPSC1                               on next page

                                                                       SC   SU                                           SS



                                                                                         
  IC9500       IC9900                          A                            SD
    PICTURE
                PLASMA AI
    OUTPUT
                                                    Video DATA (R)
     LVDS                              DATA
   RECEIVER     S.F. PROCESSOR                      Video DATA (L)
                                       DRIVER
                                                                                       Buffer IC          Buffer IC

  DISCHARGE                  Scan Control Pulse
   CONTROL                  Sustain Control Pulse



                        Up to SC Board                                           Panel Drive Circuit

                                                                 35
           Diagnosis for Picture Problem (All Over the Screen)

Confirm the waveform at "TPSC1" after removing the SU or SD Board from the SC Board



                  Situation                    Condition               Condition 2     Cause
            Disconnect SU Board                                       Bottom half of
                                              Waveform OK?                           SU Board
                  (Connect SD)                                         Picture OK?
            Disconnect SD Board                                       Upper half of
                                              Waveform OK?                          SD Board
                  (Connect SU)                                        Picture OK?
              Disconnect the SU                                       Screen should
                                              Waveform OK?                          SC Board
               and SD Boards                                             be black

                                         SC     SU                                    SS

                  Correct Waveform
                                      TPSC1
                                                            
                                                SD




                                                          Buffer IC      Buffer IC




                                                     36
                    Diagnosis of Vertical Line Problem
 NG Area (Front view)

Panel                                         case1                                      case2
                                                      Thin vertical line                          A number of blocks
                  case1        case2                   or 1 block not lighting                    not lighting

                                               PDP panel (Driver IC) NG                   A board (or C board) NG
                                               ( or A board, or C board )
                 IC IC               IC IC
                                                1 Line                  1 Block                        2 Blocks

     Buffer IC           Buffer IC
                          Buffer               PDP Panel      Buffer                      PDP Panel
C2               C1 C1                                                                   D-board ( or C-board)




                                                      Driver IC        Driver IC                 Driver IC        Driver IC
                                                                                   FPC                                        FPC
                                     Drive
                                     IC(2)
                                     inside
                                                  C Board                                    C Board

                                                              Buffer                                      Buffer

                                                                                                       or
                                                             A Board                                     A board



                                                                  37
             Picture Trouble at Upper or Lower half
                                                          
   No Picture, Picture noise, Full Horizontal line, etc.      Symptom : Horizontal line (Lower side)
                                                              Result  : SD board

   42 inch (HD Panel)


              (Front view)
                                                              Symptom : Horizontal line (Upper side)
                    1             SU                          Result  : A board

  SS                                     SC
                    2                              A
                                  SD


             C2          C1
                                                              Symptom : Horizontal line (Both area)
                                                              Result  : SS board


1 Trouble at Upper half : SU-board (SC or A) defect

2 Trouble at Lower half : SD-board (SC or A) defect
(*) Full Horizontal line at both area : SS-board (A) defect
                                              38
        Picture Trouble at Right or Left half (50 



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