ps50b51 ymain drama

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england
    #1

    ps50b51 ymain drama

    hi l I have a faulty y main Y board # Lj41-05905a,

    on this tv its the only fault

    this is where im pulling my hair out I have been through 4 mosfets on this board each time I repair it I power on click pop click click click mosfet shorted its the the very top 1 near the main power conector for the board all fuses test fine as do al the 6r2 resisors that are said to fail

    why is this mosfet keep blowing
    Tags: None
    • Glitcher
      Badcaps Veteran
      • Mar 2013
      • 673
      • USa
      #2
      Re: ps50b51 ymain drama

      Post photos of the board and which mosfets you are talking about. I just repaired one of these boards the other day, and it had a small shorted smd transistor and one open 6R2 resistor that I found. It would continue to short two of the pins of the mosfet if not replaced.
      Last edited by Glitcher; 04-07-2014, 04:06 PM.

        Comment

        • wreksta
          Badcaps Veteran
          • Aug 2013
          • 508
          • england
          #3
          Re: ps50b51 ymain drama

          dnt v a picture mat camera not re at he moment can you help m out with his transistor please location etc
          my y main is the AA1

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: ps50b51 ymain drama

              Did you replace the IGBT driver at the same time as replacing the transistors? The driver can be damaged by shorts, which can then kill the new IGBTs... leading to a never-ending drama of dying transistors.
              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

                • Glitcher
                  Badcaps Veteran
                  • Mar 2013
                  • 673
                  • USa
                  #5
                  Re: ps50b51 ymain drama

                  Which mosfet keeps blowing RHJ3044 or IRFP4332?

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