Philips 42FD9944 powersupply failure

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden
    #1

    Philips 42FD9944 powersupply failure

    Hello everyone,

    Got a struggling older Philips plasma, model 42FD9944.
    During poweron it crackles and pops from the SMPS, I can read a somewhat unstable PFC voltage of around 390VDC, jumps a few volts up and down.
    VA and VS does not start anymore, recently tried to start up those, but not reach their correct magnitudes.

    Suspect a bad caps SOMEWHERE, there are hundreds in this set.

    Please check the attached pic and let me know if you know what to check.
    Attached Files
    Tags: None
    • PowerAmpFreak
      Badcaps Veteran
      • Feb 2010
      • 977
      • Sweden
      #2
      Re: Philips 42FD9944 powersupply failure

      Any advice?
      Have to go through the pcb with freeze spray. Hairdryer didn't reveal anything.

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA
          #3
          Re: Philips 42FD9944 powersupply failure

          Crackle and popping is not a good sign, where in the SMPS is that coming from? Primary or secondary side?
          Did I leave the soldering iron on?

            Comment

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 977
              • Sweden
              #4
              Re: Philips 42FD9944 powersupply failure

              It's hard to determine which side crackles. I suspect the crackles are, simply, the PFC trying to regulate but the DC/DC is jumpy and won't present a smooth load.

                Comment

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