Vizio V0420E no power

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  • chetreynolds
    chet
    • Aug 2010
    • 77
    #1

    Vizio V0420E no power

    I need help with a vizio v0420e power board # PLHL-T802A
    The main fuse was blown
    after the fuse was replaced I had a very bright light when using a 25 watt lamp in series with the ac input
    I replaced a shorted mos fet a K13a600 after which the lamp was no longer lit
    when powered up normally the main dc voltage was 186 VDC
    The stand by voltage was 1.2 volts should be 5vdc
    all other voltages were o
    I removed and tested all electrolytic caps ESR and value
    Tested all thru hole Fets
    Tested all diodes including the zener diodes
    Was unable to find any data on u501 part # DK19B I think that this a regulator
    The voltage across ZD105 an smd zener is .141mv in circuit and the correct value 16vdc when removed
    Attached Files
    Last edited by chetreynolds; 10-14-2013, 06:49 PM. Reason: add pics
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Vizio V0420E no power

      Any pictures of the power supply board? Check 5VSTBY without main board connected?
      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

        • chetreynolds
          chet
          • Aug 2010
          • 77
          #3
          Re: Vizio V0420E no power

          The standby voltage is 1.2vdc with the main board disconnected
          I attempted to post pics but they were not included

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Vizio V0420E no power

              So do you still have the lamp in series with the AC?
              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

                • chetreynolds
                  chet
                  • Aug 2010
                  • 77
                  #5
                  Re: Vizio V0420E no power

                  no it isa connected normally

                    Comment

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