Question about BenQ FP91GX (Black, Silver) 19 inch LCD Monitor

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Hello, I don't know how to describe my problem with monitor, when I start computer everything works fine, but after several minutes (not always) sometimes after and hour, monitor starts controling contrast by itself, and it doesn't let me, to control contrast by myself, and I can't even close monitor's Main menu table. Is there any solution to fix this problem?

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  • Louis Ebert Oct 15, 2010

    qediminas kl, Problem may be with unit internal "switch-mode-power-supply"!!! Your "solution" is to open unit and inspect power-supply-board for swollen, leaky, electrolytic filter capacitors that may be causing the symptom you described. Go to YOUTUBE for video clips of owners/technicians doing "cheap" but lasting fixes to this type of problem. Also poke around in the FIXYA PROFILES of "budmrtn" and "12fixlouie" . Lots of information all over the web on "black screen of death" which your monitor may or may not be suseptable to. Good luck with repair. 12fixlouie



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You may have logic board problem dur to bad EEPROM, or unstable power supply for the logic board due to bad caps.

Basic LCD monitor troubleshooting guide:

Failed TV and Monitors:
Capacitors kit: he can make you a set of caps for you.
Please post back what you find.

Posted on Oct 16, 2010


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Hello, I don't know how to describe my problem with monitor, when I start computer everything works fine, but after several minutes (not always) sometimes after and hour, monitor starts controling contrast...

1. check the connection of between your monitor and your PC.(maybe there's a loosed connection or something) then observe. still have problem proceed to step 2.
2. Then you can try to swap another monitor to your PC. When it becomes ok. then the problem is in your monitor. need to checkup the monitor.
3. after swapping the monitor if the same problem persist. Check your video adapter.
# kindly update me what happened..happy to help you

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