Vizio VW42L HDTV10A

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  • daimoku
    Senior Member
    • Feb 2011
    • 85
    #1

    Vizio VW42L HDTV10A

    Hope you all are doing well! Been in the process of moving, but starting to get everything organized again. I'd appreciate some help with this one...

    I have a Vizio VW42L with an AU Optronics panel that powers on with no audio or video or backlight (not even for a brief second).

    Output voltages from the power supply:
    Power off
    5VSB present

    Power on
    All correct for a brief second then the supply powers off everything except the 5VSB.

    Tried
    I have two 42" Vizios right now. Both Delta power supplies use the same pinout, but they're different models. Tried the known good power supply in the VW42L, but the symptoms are the same. Checked all fuses on the mainboard, inverter and tcon. Also checked ESR of inverter and mainboard caps. Began checking mosfets on inverter, but many of them are complementary n and p channel Nikos P3004ND5G. I have been unable to locate a datasheet for those fets.

    I'm uncertain how to correctly identify the fault. Any advice on what to check or how to proceed would be much appreciated.
    Last edited by daimoku; 05-24-2011, 12:58 PM.
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Vizio VW42L HDTV10A

      Originally posted by daimoku
      Hope you all are doing well! Been in the process of moving, but starting to get everything organized again. I'd appreciate some help with this one...

      I have a Vizio VW42L with an AU Optronics panel that powers on with no audio or video or backlight (not even for a brief second).

      Output voltages from the power supply:
      Power off
      5VSB present

      Power on
      All correct for a brief second then the supply powers off everything except the 5VSB.

      Tried
      I have two 42" Vizios right now. Both Delta power supplies use the same pinout, but they're different models. Tried the known good power supply in the VW42L, but the symptoms are the same. Checked all fuses on the mainboard, inverter and tcon. Also checked ESR of inverter and mainboard caps. Began checking mosfets on inverter, but many of them are complementary n and p channel Nikos P3004ND5G. I have been unable to locate a datasheet for those fets.

      I'm uncertain how to correctly identify the fault. Any advice on what to check or how to proceed would be much appreciated.
      Have you tried checking U33 on the main board?

      A picture of the main board would help us help you. Attach using 'Manage Attachments' (below the text entry area).

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • Village Electronics
          OldPro
          • Apr 2011
          • 118
          #3
          Re: Vizio VW42L HDTV10A

          Originally posted by daimoku
          Hope you all are doing well! Been in the process of moving, but starting to get everything organized again. I'd appreciate some help with this one...

          I have a Vizio VW42L with an AU Optronics panel that powers on with no audio or video or backlight (not even for a brief second).

          Output voltages from the power supply:
          Power off
          5VSB present

          Power on
          All correct for a brief second then the supply powers off everything except the 5VSB.

          Tried
          I have two 42" Vizios right now. Both Delta power supplies use the same pinout, but they're different models. Tried the known good power supply in the VW42L, but the symptoms are the same. Checked all fuses on the mainboard, inverter and tcon. Also checked ESR of inverter and mainboard caps. Began checking mosfets on inverter, but many of them are complementary n and p channel Nikos P3004ND5G. I have been unable to locate a datasheet for those fets.

          I'm uncertain how to correctly identify the fault. Any advice on what to check or how to proceed would be much appreciated.
          What do the inverter boards look like?

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA
              #4
              Re: Vizio VW42L HDTV10A

              Originally posted by Village Electronics
              What do the inverter boards look like?
              Yeah, better suggestion.

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

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