Philips 42PFL9603 strange behaviour

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 982
    • Sweden
    #1

    Philips 42PFL9603 strange behaviour

    This set, a Philips 42PFL9603H acts very strange.
    First turn on, it does not react to remote or input signals. Backlight comes on, PSU voltages are fine.
    I have to turn it off and back on to have it operational.
    Sometimes it requires a third off and back on to have the sound up and running.
    It has the latest firmware, according to Philips download site.

    This obviously looks as a mainboard problem, but when it's on, it runs perfect.

    Phew....
    Tags: None
    • PowerAmpFreak
      Badcaps Veteran
      • Feb 2010
      • 982
      • Sweden
      #2
      Re: Philips 42PFL9603 strange behaviour

      It appears if Input source are selected any of the HDMI inputs, and there is no signal applied to it, the set will sort of "crash" during bootup. It retries to boot, set starts up, and goes through the loop again.
      Set has to be pulled from mains to exit this, and after one or two times it can operate correctly.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Philips 42PFL9603 strange behaviour

          Check all voltage regulators, particularly any that supply the main processor or HDMI input chip, if there is one.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 982
              • Sweden
              #4
              Re: Philips 42PFL9603 strange behaviour

              This ended up changing the mainboard. First one I've recieved brand new was bad. It went into protection right away, complained about internal I2C error.
              Got a second one, which did the trick and set is back to operation.

                Comment

                • freakaftr8
                  Badcaps Legend
                  • Oct 2012
                  • 3743
                  • USA
                  #5
                  Re: Philips 42PFL9603 strange behaviour

                  Yes there are two 6 pin regulators that like to fail on the philips magnavox mainboards.
                  Did I leave the soldering iron on?

                    Comment

                    • Caleb
                      Smokin IC's
                      • Feb 2013
                      • 645
                      • USA
                      #6
                      Re: Philips 42PFL9603 strange behaviour

                      @freakafter8 where might these regulators reside? I have 3 Phillips TVs with main board troubles. One acts a lot like the op described. Are they actual voltage regs?
                      Liberating magic smoke one part at a time

                        Comment

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