VeiwSonic VA912b

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  • Spacedye69
    Badcaps Veteran
    • Nov 2005
    • 698
    • US
    #1

    VeiwSonic VA912b

    Flashing green light. No picture. All the caps were CapXon.
    The three bulging caps were 470uf 25v reading between 3 and 7 ohms esr. The big 100uf 400v cap had a slight bulge but was open.

    Cap list
    KF series: mfr spec qty
    470uf 25v 10mm x 16mm ripple=1200 imp= .076 5
    470uf 10v 8mm x 12mm ripple=580 imp= .25 1

    KM series:
    100uf 400v 18mm x 35.5mm ripple=550

    I replaced the KF series with Nichicon PW, same sizes and spec.
    The KM series I used a Nichicon PB that was 18mm x 40mm.

    There was a small cap that looked like a 22uf 25v that was covered in glue that I left in.
    Attached Files

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    Tags: None
    • Krankshaft
      Badcaps Legend
      • Jan 2007
      • 2328
      • USA
      #2
      Re: VeiwSonic VA912b

      Wow thats a beefy HV transformer.

      Does it have both inverter circuits in one package?
      Elements of the past and the future combining to make something not quite as good as either.

        Comment

        • arneson
          Badcaps Legend
          • Sep 2005
          • 1267
          #3
          Re: VeiwSonic VA912b

          Good observation.
          It seems the better or more efficiant the transformer the smaller the mosfets are.
          The last two inverter modules I bought yesterday have no discrete components and drive six lamps.
          https://cdn.badcaps-static.com/pdfs/...895fd1b84c.pdf
          These fail also, I have a collection of dead ones.
          Jim

            Comment

            • aoyb
              New Member
              • Dec 2008
              • 1
              #4
              Re: VeiwSonic VA912b

              Hello ... I'm new to caps...
              Well I started wiring a junk va912b ....
              It does not look like the one above..
              with a power supply from a NEC LCD19WV power supply...
              YA it's a good one... I Found the problem with that one too late... ripped wire ... I'll make it fit..
              All I need to finish is the pin outs for CN1 Plug to power the main dvi/vga board.
              on the Viewsonic VA912b.

              I'm also gonna wire the board to the pc power supply.

                Comment

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