Troubleshooting a Viewsonic vx1940w

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  • mitch101
    New Member
    • Oct 2011
    • 5
    #1

    Troubleshooting a Viewsonic vx1940w

    When switched on, there is a buzzing noise, the desktop is visible for a couple of seconds then display goes blank. The blue power LED remains permanently on.

    Can anyone tell me if this fault is definitely a capacitor issue? The two 35v 220uf capacitors are slightly raised/domed.

    Cheers,
    Mitch
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Troubleshooting a Viewsonic vx1940w

      Originally posted by mitch101
      When switched on, there is a buzzing noise, the desktop is visible for a couple of seconds then display goes blank. The blue power LED remains permanently on.

      Can anyone tell me if this fault is definitely a capacitor issue? The two 35v 220uf capacitors are slightly raised/domed.

      Cheers,
      Mitch
      The symptoms are known as 'Two seconds to black'. They have a number of possible causes, one of which is bad caps. Replace the caps with name brand low ESR caps (I prefer Panasonic FM, FR, or FC series) and proceed from there.

      It would be a Very Good Idea to replace all the electrolytic caps on the power supply / inverter with the possible exception of the large (100uF?, 450 volt one).

      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

        • mitch101
          New Member
          • Oct 2011
          • 5
          #3
          Re: Troubleshooting a Viewsonic vx1940w

          ok thanks for reply.

          Buying a new power supply board costs about the same as buying a soldering kit and caps separately. I'll get a new board and report back for the benefit of anyone who has this problem in future with his monitor.

          Mitch

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA
              #4
              Re: Troubleshooting a Viewsonic vx1940w

              Originally posted by mitch101
              ok thanks for reply.

              Buying a new power supply board costs about the same as buying a soldering kit and caps separately. I'll get a new board and report back for the benefit of anyone who has this problem in future with his monitor.

              Mitch
              There is one practical problem with that approach - the new board will have the same low quality caps and will fail sooner rather than later.

              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

                • funkykryptonite
                  New Member
                  • Jan 2012
                  • 1
                  #5
                  Re: Troubleshooting a Viewsonic vx1940w

                  I just had the same problem as Mitch101. I replaced the two 220uf 35V caps with nichicon caps, and I am up and running right now on my viewsonic vx1940W. Thanks alot Plainbill, just saved my butt.

                    Comment

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