Samsung plasma PS42Q91HDX/XSA turns itself off/on.

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  • Dakkrew
    New Member
    • Feb 2015
    • 8
    • Australia
    #1

    Samsung plasma PS42Q91HDX/XSA turns itself off/on.

    Hey everyone, PS42Q91HDX/XSA Samsung plasma issue here. TV wouldn't turn on so replaced 2 (visually) bad caps on the PCB. TV then fired up straight away and all settings OK. 10 minutes later the set turned itself off and began clicking on/off but not actually turning on (just like a bad cap problem). If I turn it off at the mains for a while, then try it, it's fine again for a short period.
    Should I replace the rest of the caps on the PCB? Are there other issues with this model I should know about?
    Thanks in advance for your help and advice.
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

      Originally posted by Dakkrew
      Hey everyone, PS42Q91HDX/XSA Samsung plasma issue here. TV wouldn't turn on so replaced 2 (visually) bad caps on the PCB. TV then fired up straight away and all settings OK. 10 minutes later the set turned itself off and began clicking on/off but not actually turning on (just like a bad cap problem). If I turn it off at the mains for a while, then try it, it's fine again for a short period.
      Should I replace the rest of the caps on the PCB? Are there other issues with this model I should know about?
      Thanks in advance for your help and advice.
      reflow all the heatsinked fets etc especially the centre heatsink as these also have a habit of cracked solders. If you keep trying to run it like this those FETs and a whole bunch of smd stuff underside will blow if it does have bad joints.

        Comment

        • freakaftr8
          Badcaps Legend
          • Oct 2012
          • 3743
          • USA
          #3
          Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

          Look at the power supply for bad solder connections. Mostly the mosfets and components attached to the heat syncs. They are probe for fatigue. I would try to resolder any suspicious connections on the bottom of the board.
          Did I leave the soldering iron on?

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA
              #4
              Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

              Lol tw2005 beat me to it.
              Did I leave the soldering iron on?

                Comment

                • Dakkrew
                  New Member
                  • Feb 2015
                  • 8
                  • Australia
                  #5
                  Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

                  Thanks guys. I'll let you know how it goes.

                    Comment

                    • Dakkrew
                      New Member
                      • Feb 2015
                      • 8
                      • Australia
                      #6
                      Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

                      Hey Guys, you were spot on! Didn't see it when I first checked the board over but on closer inspection, as you both said, the centre heatsync joints were cracked. Reflowed all heatsync and fet joints and the telly works like a bought one!
                      Thanks very much you guys rock!

                        Comment

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