Viewsonic Vp201B flickering

[beanbag]

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]

Re: Viewsonic Vp201B flickering

Lower backlight intensity does it still flicker check capacitors on mainboard

[stj]

Re: Viewsonic Vp201B flickering

does it have hours used in the system menu anywhere?

[beanbag]

Re: Viewsonic Vp201B flickering

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