Vizio VP50 HDTV20A turns off unexpectedly

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  • awyea
    New Member
    • Jan 2015
    • 4
    • United States
    #1

    Vizio VP50 HDTV20A turns off unexpectedly

    The tv would turn off after about 20 minutes of being powered on, although the picture is quite good when running. I took it apart and replaced 6 bulging on the power supply. All were 2200uf 10v, and I replaced them with new panasonic caps. I checked the Vs and Va, both are fine. I read about some cold solder joints, so I touched up quite a few solder points. The tv will still turn off after about 20 minutes or so.

    Also, right after I replaced the caps, the tv stayed on for a good 2 hours or so until I turned it off. I figured this was a good test and put everything back together and moved the tv back upstairs. It is much cooler in the basement. Does the power supply have some sort of overheat protection? I'm lost.
    Tags: None
    • MagicSmoke
      Badcaps Veteran
      • Feb 2011
      • 275
      • USA
      #2
      Re: Vizio VP50 HDTV20A turns off unexpectedly

      You will have to replace all of the low voltage caps. 25 or so in total.

      I had to do this on my P50hdtv10a PSU.

      What is the part number on your PSU?

        Comment

        • awyea
          New Member
          • Jan 2015
          • 4
          • United States
          #3
          Re: Vizio VP50 HDTV20A turns off unexpectedly

          LJ44-00132B is the part number I think. I also found a bulging cap on the x board.

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia
              #4
              Re: Vizio VP50 HDTV20A turns off unexpectedly

              Similar samsung model with similar PSu had issues with cracked solder on the heatsinked FETS. i had one and it would randomly turn off, it could stay on for an hour,several hrs, all day.

              when i flexed the board in the middle it shutdown, was fine after a reflow of the FETs, so i guess it depends on what you reflowed. The fets can blow from what i've read when it has these bad joints.

                Comment

                • awyea
                  New Member
                  • Jan 2015
                  • 4
                  • United States
                  #5
                  Re: Vizio VP50 HDTV20A turns off unexpectedly

                  Replaced all of the low-voltage caps, did a FET reflow again, still turns off after 5-10 minutes. Also, my green light has stopped coming on. Any other ideas?

                    Comment

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