Question about ViewSonic VP930b 19" LCD Monitor
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). Basic LCD monitor and TV troubleshooting guide: Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Look for burnt/harden wires on the lamp assemblies.
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Basic LCD monitor and TV troubleshooting guide:
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Posted on Apr 03, 2011
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Posted on Jan 02, 2017
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