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!
  • 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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