Panasonic Viera P42U10E Replacing buffer board! What to check?

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  • Moreno83
    Badcaps Legend
    • Jun 2014
    • 2008
    • The Netherlands
    #1

    Panasonic Viera P42U10E Replacing buffer board! What to check?

    Hey guys ,

    Im having some trouble with this TV. It has a shorted lower bufferboard. Upper board is fine and SC board is also fine. ( did the jumper check and tv stays on ).

    I replaced the buffer board before and forgot to test it and same issue , tv is blinking and board is short.
    I now have a NEW lower bufferboard ( TNPA4785 ) which i want to replace in the tv , what can i do to prevent the board to get shorted to? I tested the new board and it has NO shorts!

    Are there any tests that i can do? Is the panel shorting the board or the SV board shorting the buffer board?
    I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!
    Tags: None
    • Moreno83
      Badcaps Legend
      • Jun 2014
      • 2008
      • The Netherlands
      #2
      Re: Panasonic Viera P42U10E Replacing buffer board! What to check?

      Vsus on sticker is 209V , im measuring also 209V.
      I measured the 4 " iron blocks " ( ZA411 ) where the screws go into and it measured " - 130V ".


      TPVSUS = 208.9v ( ground to test point ).
      TPVSET = 290.8v ( ground to test point )
      TPVAD = -217.2v ( ground to test point )
      TPVSCN = -60v ( ground to test point ).


      Im afraid to place the new board , don't want to brake it!
      Last edited by Moreno83; 07-09-2015, 11:55 AM.
      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

        Comment

        • Moreno83
          Badcaps Legend
          • Jun 2014
          • 2008
          • The Netherlands
          #3
          Re: Panasonic Viera P42U10E Replacing buffer board! What to check?

          From the service manual :

          Vset
          TPVSET (SC) = 290V ± 9V

          Vad
          TPVAD (SC) = - 195V ± 2V
          VR16600 (SC)

          TPVSCN (SC)
          Vad_base : 148V ± 1V GND_base : - 47V ± 3V
          VR16841 (SC)

          Vda
          TP9 (P)
          60V + 1V, - 2V
          I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

            Comment

            • Moreno83
              Badcaps Legend
              • Jun 2014
              • 2008
              • The Netherlands
              #4
              Re: Panasonic Viera P42U10E Replacing buffer board! What to check?

              This tv won't turn on with just the upper buffer board only , still 7 blinks. Is that normal for this set? I read that some panasonic plasma's work with just 1 buffer.

              Also , TPVAD is around -217V on my set and in the manual it says it has to be around -195V. I tried to alter the voltage with the correct pot meter as shown in the manual but it won't drop to -195. It just stays on -210/217. Is that because the buffer boards are not connected? Btw , all voltages are without the bufferboards connected.
              Test point 9 on the PS is 60V so everything looks good but im afraid that if i install both bufferboards that i get the 7 blink code again due to a bad panel. Panel and tabs all look good.

              I hope that someone can verify that my voltages are ok and that i just need to install the boards to see if it works or not........

              Sorry for all the info , just want to be sure and not break the board!
              Last edited by Moreno83; 07-09-2015, 03:52 PM.
              I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                Comment

                • Moreno83
                  Badcaps Legend
                  • Jun 2014
                  • 2008
                  • The Netherlands
                  #5
                  Re: Panasonic Viera P42U10E Replacing buffer board! What to check?

                  I corrected all the voltages including VAD and installed the NEW buffer board.

                  7 blinks and the new board is short. This tv is going to the trash.......
                  I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                    Comment

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