Vizio P50HDTV20A Power Issue

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  • chrisjwhite
    New Member
    • Sep 2014
    • 7
    • United States

    #1

    Vizio P50HDTV20A Power Issue

    I found a Vizio P50HDTV20A 50in Plasma on the side of the road. I figured it might be fixable so I grabbed it.
    When plugged in the light in front is amber and turns green when turned on. Nothing shows up on the screen and I do hear the speakers pop slightly when turned on.
    The power board is a Samsung PSPFS561A01A. For voltages I measured all the little pads I could find. All capacitors look fine. I did replace one one each of the Display Boards. (X and Z I think they are called?)
    Vs: 208
    Vg: 14.8
    5Vsb: 5.1
    A12V: 12.0
    Vamp: 23.6
    VT: 32.6
    D5V: 5.1
    D3V3: 3.4
    Va: 63.0
    Everything was measured with the TV turned on and everything connected to the board.
    The Green LED1 doesn't light up at all.
    LED 2002 on the other smaller board constantly blinks.

    All I have is a Multimeter to test things. Any help would be appreciated.

    Thanks
  • chrisjwhite
    New Member
    • Sep 2014
    • 7
    • United States

    #2
    Re: Vizio P50HDTV20A Power Issue

    Did some more checking. The board with the heatsinks on it on the left when looking at it from the back I think has some shorted FETs (Components screwed to the heatsinks).
    D5003, D5001, D5005 all have continuity between the 2 outside pins.
    All of the fuses are good.
    Pictures on dropbox
    https://www.dropbox.com/sc/tu6m6bwhk...RShr_LqGDtM7pa
    Last edited by chrisjwhite; 09-23-2014, 06:46 PM.

    Comment

    • chrisjwhite
      New Member
      • Sep 2014
      • 7
      • United States

      #3
      Re: Vizio P50HDTV20A Power Issue

      Does anyone have any ideas?

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: Vizio P50HDTV20A Power Issue

        So the shorted FETs were on the Ymain and were any of them 88N30W?

        Any signs of burns or holes in the upper buffer board ICs?

        That setup is notorious for blowing the ymain and top buffer board and often in the samsungs we read sound , no picture.

        Would not have a clue about Vizio. The LEDs, are we talking on the logic ctrl board for blinking? Is led 2002 on the logic ctrl? If blinking every second or 2 secs that's normal, means that board is running.

        Is there a led on the ymain?

        post pictures by going advanced, mnage attachments and upload, much easier.

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia

          #5
          Re: Vizio P50HDTV20A Power Issue

          LED5800, on the ymain next to the connector the flat white ribbon connects , is that lit when the TV is on?

          Comment

          • tw2005
            Badcaps Legend
            • Oct 2011
            • 6458
            • Australia

            #6
            Re: Vizio P50HDTV20A Power Issue

            handy brochure
            Attached Files

            Comment

            • cliff_hootarski
              Badcaps Veteran
              • Jul 2006
              • 411
              • USA

              #7
              Re: Vizio P50HDTV20A Power Issue

              See this thread:

              https://www.badcaps.net/forum/showthread.php?t=40511

              Check all the fuses on the Ysus board (Facing the rear of the TV, Left large rectangular board with 3 large heatsinks). 1 large white fuse and 3 small green fuses.

              Comment

              • tw2005
                Badcaps Legend
                • Oct 2011
                • 6458
                • Australia

                #8
                Re: Vizio P50HDTV20A Power Issue

                Originally posted by chrisjwhite
                Did some more checking. The board with the heatsinks on it on the left when looking at it from the back I think has some shorted FETs (Components screwed to the heatsinks).
                D5003, D5001, D5005 all have continuity between the 2 outside pins.
                All of the fuses are good.
                Pictures on dropbox
                https://www.dropbox.com/sc/tu6m6bwhk...RShr_LqGDtM7pa
                D5003,5001,5005 will be diodes and if they have 3 legs then the outer 2 are the same connection, eg A-K-A so outer 2 are anode to anode and will show short.

                Comment

                • chrisjwhite
                  New Member
                  • Sep 2014
                  • 7
                  • United States

                  #9
                  Re: Vizio P50HDTV20A Power Issue

                  Here are some pics. I see no obvious damage on anything. LED5800 does NOT light up.
                  Attached Files

                  Comment

                  • chrisjwhite
                    New Member
                    • Sep 2014
                    • 7
                    • United States

                    #10
                    Re: Vizio P50HDTV20A Power Issue

                    Originally posted by cliff_hootarski
                    See this thread:

                    https://www.badcaps.net/forum/showthread.php?t=40511

                    Check all the fuses on the Ysus board (Facing the rear of the TV, Left large rectangular board with 3 large heatsinks). 1 large white fuse and 3 small green fuses.
                    Fuses are all good.

                    Comment

                    • Tvbob
                      tvbob
                      • Dec 2009
                      • 204

                      #11
                      Re: Vizio P50HDTV20A Power Issue

                      The buffer ic's take out the Y main on these Samsung panels.

                      Comment

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