Vizio E371 Completely Dead

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  • hanks424
    New Member
    • Nov 2013
    • 8
    • usa

    #1

    Vizio E371 Completely Dead

    No amber Vizio, LCD TV completely dead.

    Power supply outputs 5v, outputs 12v and inverter backlights when pins 3 & 4 supplied 5 v via 100 ohm resistors with voltage & video board disconnected. Power supply OK?

    All fuses on both boards OK, caps look OK, could only find 2 regulators on video board (UP3 UP13) both have extremely low voltage (165 mV in .8mV out)

    Any ideas how to proceed?
    Attached Files
  • ecking767
    Badcaps Veteran
    • Oct 2009
    • 492
    • USA

    #2
    Re: Vizio E371 Completely Dead

    check the main CPU for over heating. Plug in the power cord.

    Comment

    • hanks424
      New Member
      • Nov 2013
      • 8
      • usa

      #3
      Re: Vizio E371 Completely Dead

      No difference: cold start 82.3 degrees, plug in power, temp stays @ 82.3

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Vizio E371 Completely Dead

        What DC voltages do you get at both ends of the two fuses on the main board with ref. to chassis ground?
        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

        • hanks424
          New Member
          • Nov 2013
          • 8
          • usa

          #5
          Re: Vizio E371 Completely Dead

          On the main board I read 5.1 volts both sides FP1, and 5 mV both sides on FP2 (should be 12 v). Obviously the video board is not turning on the 12v supply. As mentioned the power supply outputs 12v when triggering it alone via on-off pins (3 and 4)

          Comment

          • hanks424
            New Member
            • Nov 2013
            • 8
            • usa

            #6
            Re: Vizio E371 Completely Dead

            The power board checks out OK (380 volts across capacitor) - problem is no turn-on signal from the video board. Can anyone help with a schematic or circuit description for this board? Does EPROM control feedback to power board? Since we're not getting amber logo on startup, I'd like to focus on the components that trigger turn-on signal.
            Ideas welcome :-)

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Vizio E371 Completely Dead

              "The power board checks out OK (380 volts across capacitor)" PS_ON must be OK, otherwise the PFC Voltage booster will not be working to put out 380VDC on the main cap.
              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

              • hanks424
                New Member
                • Nov 2013
                • 8
                • usa

                #8
                Re: Vizio E371 Completely Dead

                To BUDM: PS_ON is not functioning via the video board. Video board was disconnected -- I turned the 12v bus and inverter trigger on manually at the power suppy.

                I'd really like to run this down -- lost without schematic

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Vizio E371 Completely Dead

                  Sorry, memory lapse.
                  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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