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Vizio P50HDTV10A blew fuse

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    Vizio P50HDTV10A blew fuse

    Hey all, I have a Vizio P50HDTV10A that I recently acquired. The previous owner said he was watching it and it popped and wouldn't turn back on. I cracked it open and found no blown or bulging caps anywhere. I checked the 8a ceramic fuse and it was open. I did not have another 8A so i popped in a 4A glass and the set fired right up and all the voltages were accurate. I proceeded to watch Netflix for about 5 hours before the 4 amp fuse let go. I have the correct fuse on order. My question is would it be wise to recap the power supply before I put the TV back in service? I dont know what caused the original fuse to blow and I know this model has a habit of popping power supplies and Y boards. Any thoughts?

    #2
    Re: Vizio P50HDTV10A blew fuse

    If your set has an LG panel and components with PSU # aax30284301 And depending on age/usage there should be 8 or 9 caps on the PSU that will go bad.

    I have a 2007 Vizio P50HDtv10a that has LG stuff. Got to where it would take many attempts to power on, 8 bloated caps on PSU. Changed all caps on PSU to good quality ones and no more problems.

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      #3
      Re: Vizio P50HDTV10A blew fuse

      Thanks MagicSmoke. Mine is a late 2006 with LG panel and internals as well. Do you remember which ones were problematic? I count 25 Caps, not including the giant ones, on the power supply board. Im thinking about just replacing them all.

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        #4
        Re: Vizio P50HDTV10A blew fuse

        The ones that bloated on mine were 3300uf 10v capxcon iirc. I replaced all of the low voltage caps on the PSU just to be on the safe side.

        The large high volt caps hardly ever fail. Not saying they can't, I just have not found one yet.

        The small ones are all the same age hour wise and they are fairly cheap.

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          #5
          Re: Vizio P50HDTV10A blew fuse

          I replaced every cap on the power supply and put it all back together. I think I may have found my root cause. The AC power connector had an extremely loose wire. It has red, blue, and green wires that are connected to the AC input using solderless terminals. The blue wires female quick disconnect was loose and the clear rubber insulation boot was blackened and melted. I replaced the terminal and cleaned the male side as well. The set has been working great for the past 10 hours of straight netflix use by my kids.

          My only issue now is there are occasionally some red spots when the screen gets full bright. I read that this could be solved with a voltage adjustment. It did not do this prior to recapping. I verified all of the caps were the same values as the ones I removed. Any help or insight would be great. Thanks again!

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            #6
            Re: Vizio P50HDTV10A blew fuse

            It's a good practice after a recap to check and adjust VA, VS, VE and Vscn to what panel sticker indicates.

            There are adjustment pots on PSU for VA & VS, X board will have adjust for VE and Y should have one for Vscn.

            Start with VS & VA then VE and Vscn there will be test point indicators for each voltage, they are not always close to adjustment pot.

            EDIT I try to do the adjustments an a white screen or static display as this draws the most amps from the PSU.
            Last edited by MagicSmoke; 01-03-2015, 05:20 PM.

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              #7
              Re: Vizio P50HDTV10A blew fuse

              I will get those adjusted tonight. Thanks for the info!

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                #8
                Re: Vizio P50HDTV10A blew fuse

                All of the voltages were within .5v

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                  #9
                  Re: Vizio P50HDTV10A blew fuse

                  Do a search for YFR and YRR adjustments. These seem to help with sparklies.

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