Vizio Vo47L FHDTV30A dead randomly

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  • ej207
    New Member
    • Oct 2014
    • 9
    • United States

    #1

    Vizio Vo47L FHDTV30A dead randomly

    hello im trying to trouble shoot a Vizio Model# VO47L FHDTV30A

    I tested all the pins in the plugs to the bottom right of the board and no voltage?. Weird i thought, so I made sure my multimeter was O.K. by testing other devices, even the wall outlet haha. No voltage at any pins.



    Quick history on the board, previous owner which is an old friend of mine replaced two resistors not sure when or if they were even right can't find schematics on psu for this model googled for a while.
    R901
    R601

    I'm not sure when was repaired to the time it broke on me, probably a few months? I was watching the TV and it shut off. No power led's nothing its completely dead. I have fixed some TV's in the past that just had the obvious blown caps, I don't see any bulging caps. Here is some pics of the boards i'm looking for some advice on troubleshooting to find the bad component to try fixing it and if worse comes to worse i'll just replace it but I would love to avoid ebay if anyone has some site recommendations.
  • ej207
    New Member
    • Oct 2014
    • 9
    • United States

    #2
    Re: Vizio Vo47L FHDTV30A dead randomly

    pic post
    Attached Files

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    • triplefour
      Badcaps Legend
      • May 2014
      • 1747
      • USA

      #3
      Re: Vizio Vo47L FHDTV30A dead randomly

      checked fuse? volts at main filter cap? (careful thats the deadly one)
      Don't fear the repair...

      Comment

      • ej207
        New Member
        • Oct 2014
        • 9
        • United States

        #4
        Re: Vizio Vo47L FHDTV30A dead randomly

        I've checked all fuses and i'll try that, what voltages am I looking for?

        Comment

        • triplefour
          Badcaps Legend
          • May 2014
          • 1747
          • USA

          #5
          Re: Vizio Vo47L FHDTV30A dead randomly

          on the main filter cap you should see 160-170v
          keep the black probe on the negative leg of the main filter cap, and probe the diodes in the area next to it to see where you lose voltage?
          i havent had a lot of success yet with repairing PSU's at component level. i still need a lot of help from the masters here
          but just be cafeful with that main filter cap thats all i can say cuz it hurts!
          Don't fear the repair...

          Comment

          • ej207
            New Member
            • Oct 2014
            • 9
            • United States

            #6
            Re: Vizio Vo47L FHDTV30A dead randomly

            Nice, I will try that. I don't know what the main filter cap is though.. i will google some pics and see if i can't figure that out thanks

            Comment

            • triplefour
              Badcaps Legend
              • May 2014
              • 1747
              • USA

              #7
              Re: Vizio Vo47L FHDTV30A dead randomly

              its the biggest capacitor on the board. in your case, the one that is surrounded by the heat sink but not under it
              Don't fear the repair...

              Comment

              • ej207
                New Member
                • Oct 2014
                • 9
                • United States

                #8
                Re: Vizio Vo47L FHDTV30A dead randomly

                in CAP mode on multimeter, readings were erratic but only when recontacting multimeter probes. im no pro, not sure if that is even an appropriate setting.

                as this picture illustrates, that huge cap was reading 160 volts. im not sure how to test those resistors maybe my multimeter sucks but on both leads it was still 160 volts

                Comment

                • triplefour
                  Badcaps Legend
                  • May 2014
                  • 1747
                  • USA

                  #9
                  Re: Vizio Vo47L FHDTV30A dead randomly

                  not sure about the CAP setting on your multimeter. mine doesnt have one. just setting your meter to 200v DC range should be good enough.
                  Don't fear the repair...

                  Comment

                  • ej207
                    New Member
                    • Oct 2014
                    • 9
                    • United States

                    #10
                    Re: Vizio Vo47L FHDTV30A dead randomly

                    Yep, that was my result. Appreciate you taking the time to help e-troubleshoot.

                    idk what voltage should be at the cap, i don't have any schematics for this PSU. do you? I have googled !

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Vizio Vo47L FHDTV30A dead randomly

                      Voltage on the main cap should be 160~170VDC in standby mode, > 350VDC when TV is on.
                      I need good clear pictures of the bottom side of this power supply-inverter board combo, the whole board picture and in closed up in quarter section so I can easily trace the connections on the bottom side of the board.
                      BTW, you do not have any DC Voltage at the 5VSB pins at all?
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment

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