No picture 42PC3

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  • paulstef
    Badcaps Veteran
    • Dec 2013
    • 724
    • Canada

    #21
    Re: No picture 42PC3

    -VY ramps up from 0 to 27V in about 5ms, then stops and tries again afterabout 12ms. Does this a few times then stops and tries again after some more time.

    What do I supposed to have on -VY?

    Comment

    • paulstef
      Badcaps Veteran
      • Dec 2013
      • 724
      • Canada

      #22
      Re: No picture 42PC3

      Ok, from the label on the panel it seems I should have -180 on -VY.

      Comment

      • paulstef
        Badcaps Veteran
        • Dec 2013
        • 724
        • Canada

        #23
        Re: No picture 42PC3

        IPM is ok, no other bigger semiconductor is damaged. I separated the buffer from the sustain board, still the same weird -VY voltage ramps. Why they don't just give us the schematic!!!!

        Comment

        • paulstef
          Badcaps Veteran
          • Dec 2013
          • 724
          • Canada

          #24
          Re: No picture 42PC3

          Just to conclude, it turns out that the little pnp- transistor Q2 in a SOT-89 package on the Y-sustain board, driver for the bigger transistors on the heatsink was also damaged. Tv works.

          Comment

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