Question about ViewSonic VP930b 19" LCD Monitor

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Picture comes on the goes blank, reset power does the same condition pix for 2 seconds then goes blank. - power supply keeps proper voltage - top inverter transformer was squeeling the repklaced board - no change - apparently main board has a blanking or drive problem - ordered replacement board - same condition - wa stold these monitors seem to have this problem - maybe factory new board is bad with the same problem - what is the faiure history with this problem when shows a pix for two seconds pix looks fine - don't expect a bad back lite - pix looks bright.

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You can still have bad backlights lamps, that is why the transformer is squealing due to poor connection on the wire at the lamp connection, the output of the inverter voltage will try to go up to keep the lamp firing and draws too much current and cause the inverter circuits to shutdown. The inverter has two detection circuits: over current and open lamp sensing (it will sense if the lamp will fire up and stay on).
Look for burnt/harden wires on the lamp assemblies.

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Apr 03, 2011

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Good day.
This are the procedures to find out the causes:
  1. Open the back cover by removing all screws.
  2. Power ON the TV to perform voltage data.
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Please see my basic troubleshooting guide here:

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