Viewsonic Vp201B flickering

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  • beanbag
    New Member
    • Mar 2015
    • 3
    • US

    #1

    Viewsonic Vp201B flickering

    Hello folks,

    I have an old Viewsonic VP201b that has worked for many years, and finally started to flicker for several seconds upon first turning it on in the morning. By flicker, I mean the display quickly pulses on and off for a few seconds, and finally becomes stable.

    I took the monitor apart and first suspected the power supply, because I was measuring the voltage during the flickering, and the power supply would quickly dip down below it's nominal voltage. But then I took the power supply out and replaced it with an external supply, and that did the same thing, namely the voltage would drop quickly while the display was flickering. So I don't think there is anything wrong with the original PS, but rather, it seems like something else is rapidly and intermittently shorting, causing the supply voltage to dip.

    I don't see any bulging caps or other burn marks anywhere on the boards. Any suggestions where to look or diagnose?

    Thanks
  • 1supertech
    Badcaps Veteran
    • Apr 2012
    • 384
    • USA

    #2
    Re: Viewsonic Vp201B flickering

    Lower backlight intensity does it still flicker check capacitors on mainboard

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30932
      • Albion

      #3
      Re: Viewsonic Vp201B flickering

      does it have hours used in the system menu anywhere?

      Comment

      • beanbag
        New Member
        • Mar 2015
        • 3
        • US

        #4
        Re: Viewsonic Vp201B flickering

        Thanks for the suggestions. The monitor is apart right now, so I can check in a few days.

        Comment

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