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Viewsonic VA1912wb problems with different power board

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    #1

    Viewsonic VA1912wb problems with different power board

    I replaced the bulging CapXon caps: 220uF & 25V (three) and 1000uF & 25V (two). All five pictures were taken after replacing the caps. I used one by Samwha, one by Elna, and the three 220uF were from ... Chemicon?

    I left the Taicon caps alone: 2200uF & 10V, 1000uF & 10V, and 330uF & 25V.

    There was one small CapXon capacitor but I wasn't able to read its capacitance and voltage because of the epoxy covering it. I suspect it's 22uF & 50V, but the board I have isn't the same one featured in these two URLs:

    https://www.hobbymods.com/store/inde...ent-parts.html

    http://lcdalternatives.auctivacommer...-P1660488.aspx

    I want to confirm the small capacitor on MY board is 22uF & 50V. I'd also love to know which of the Taicon capacitors should be replaced.

    I turn on the monitor and see a flicker of backlight. I failed to see an image, but didn't have my flashlight to see whether the image was present without a backlight. Power LED goes from steady green to steady amber.

    I still miss my ESR Micro.

    Thanks for reading!
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    #2
    Re: Viewsonic VA1912wb problems with different power board

    1) Search for your board on this site. The DAC-19*** has many threads here and you may find an identical revision.

    2) IC201 and IC202 look like they are running very hot. Some browning is normal, but you may want to check to see if they are shorted or not. Replacements are available on ebay. 2 for $4 + free shipping.
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      #3
      Re: Viewsonic VA1912wb problems with different power board

      I'll be looking at the threads that mention the DAC-19M008 board. Mine ends with AF and its revision is 01A.

      I also replaced the Taicon capacitors as well as the 22uF (50V) capacitor.

      I didn't change the behavior. I still get a flicker of backlight, and I failed to see an image. LED went from green to amber as expected.

      I still have yet to check IC201 and IC202.

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