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Samsung plasma PS42Q91HDX/XSA turns itself off/on.

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    #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.
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    #2
    Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

    Originally posted by Dakkrew View Post
    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.

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      #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?

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        #4
        Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

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

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          #5
          Re: Samsung plasma PS42Q91HDX/XSA turns itself off/on.

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

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            #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!

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