Pansonic TH-42px70 st/by light flashes 10 times

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  • leonard
    Leonard085
    • Aug 2010
    • 10
    • Ireland
    #1

    Pansonic TH-42px70 st/by light flashes 10 times

    This plasma the st/by light flashes 10
    by disconnecting the signal pcb the screen comes on with a whitish picture
    i have being checking the output voltages of the power supply while it is working
    and found no FVc voltage on pin 8 and 9 of connector p6

    Has anyone got a schematic of the psu, the only markings on it are TNPA4221
    Thanks
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Pansonic TH-42px70 st/by light flashes 10 times

      Try digging through this manual as I suspect it has a TNPA4221. I think there may be some variants, worth a shot.

      TH-42PX75U



      https://www.badcaps.net/forum/showthread.php?t=25836

      http://www.tgohome.com/ServiceManuals

        Comment

        • leonard
          Leonard085
          • Aug 2010
          • 10
          • Ireland
          #3
          Re: Pansonic TH-42px70 st/by light flashes 10 times

          Thanks, very similar to my circuit
          The power supply is ok
          There is a problem with the main pcb
          I am looking at all the regulators on the main pcb
          The sos tp is at around 1v which means there is a problem somewhere
          what I think is happening is that the regulators are under the control of a microprocessor, and these are not being switched on,
          I will have to go thru all of the protection circuitry
          I will post more when i get to the cause

            Comment

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