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Benq 937s monitor problem

Thanks for your response on my monitor problem. I have looked long and hard at the electrolytic capacitors, but can see no bulging or leaking. Could they still be at fault or should I look elsewhere. I have had experience in soldering and the like so is not a problem to do, but I don't want to start pulling stuff apart until I am confident I have homed in on the problem. Any further comments?

Thanks, Lucksafortun

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  • Lucksafortun Jun 12, 2008

    Well Russolini I went ahead and changed all 4 electrolytic caps on the power supply circuit and bob's-me-uncle...It is working again.



    Thanks a lot.

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Hi again,
They can most definitely still be at fault - here's where it becomes tricky. To properly test electrolytic capacitors you need an ESR meter - not cheap - or you could spend the $150 on a complete set of replacement caps instead. You're really rolling the dice either way, because it might turn out to be a bad transformer or something completely different. I've fixed 15-20 LCD monitors and the problem is almost always a cap, some are visible and easy fixes, others have stumped me for days and days until I just start replacing caps in the hopes of lucking out.
One of the things I tried when I first started doing it was searching google for the model number of the monitor to see if anyone else had fixed one and might know which parts were bad.

Wish I could help more, sorry it didn't end up being an easy fix. Maybe it's worth calling the computer/TV repair shop and asking how much they'd charge to fix a LCD power issue.

Best of luck,
Russ

Posted on Jun 11, 2008

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