Question about ViewSonic VA720 17" LCD Flat Panel Monitor

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Troubleshooting ViewSonic Monitor

Thank you for your response. I have taken your advice and verified the monitor is working but just not visible. However, when I removed the back of the monitor and inspected the circuit card I found no signs of damage, shorts, etc near the seven (or so) capacitors or anywhere else on the board. Do you have any insight into which capacitor(s) may be the problem spot.

Also, I did some additional research on the board manufacturer Sampo. I found a couple of sources which identified this issue but stated that replacing the capacitor was only a very temporary fix and that the same issue would quickly occur due to an electrical short somewhere else within the board.

I have help with the troubleshooting and repair, but do not want to waste time on a wild goose chase lookibng for the bad component. Would I be better off replacing the board wether than trying to troubleshoot on a component by component basis? I'd appreciate any advice you can offer.

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It can be easier to replace the whole board, it's what they do quite often back at the service centres. There it is normally a cost/time issue. It can becheaper to replace the board then burn up even an hour to look for the faults.

If you decide to reppace the board, and you can find one, then try this...
Capacitors these days do not all show visible signs of damage, or shorting. They suffer a condition known as "dry caps" where the internal layers of the capacitor dry out, and one of the legs is not making good contact..hence lower capacitence.

Testing this is fairly easy. Just look for the stripe side (negative leg) and rock the capacitor with a small amount of force in that direction, then rock it back in the exact opposite direction. If one of the legs lets go under minimal pressure, then you have it.

If you find one like this, then replace the lot, hence the temporary fix some claim. It's because they replace only the ones that have gone now, not realising they will all fail around the same time..within 12 months at least.

If you can get a photo of the component side of your particular board then I can also probably point you to a few other spots to check. They use various boards in the same monitor..same schematics, then updated and revised as time goes by.
emailto:saitek@tpg.com.au

Posted on Apr 22, 2008

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