Having problems with your BenQ FP731 17" LCD Monitor ?

BenQ FP731 Screen briefly displays then turns off

\015 We have a computer we brought back from a satellite office that has been in use for about 5 months. The LCD 17" monitor (BenQ FP731) and the computer have been plugged into a APC 500VA UPS for the entire duration. Prior to this move, they have worked just fine, together.\015\012\015\012When I plugged the PC in and turned it on here at the main office, the green monitor light comes on, briefly shows the POST screen then shuts off. If I turn the monitor off and back on, I can see the Windows XP logon screen briefly before the monitor shuts off again. I can power off and turn it back on and the screen displays briefly (about 1 second) then shuts off. I have tried this monitor on other PC's and it does the same thing.\015\012\015\012I'm at a loss at this point. It's not that old and has worked flawlessly until this point. Any thoughts on what else I can try? The video card works great with other CRT's we have (I haven't dared pull a working LCD off one of the other PC's as they'll come at me with knives :)\015

Answers :

Did an independent diagnosis before finding this, and came to same conclusion. First found fuse PF751 was open circuit (3A black plastic fuse, not glass) over close to main heat sinks. When I replaced that with a fine fine strand of wire (for testing) then I saw Q759 (C5707) get hot. Checking the others shows that they should be driving into about 420 ohms on the primary side of the transformer for the flourescent lights (backlights) but on this one it was less than 1ohm. I've unsoldered the Q759 and now I measure 420ohms here too. Now I need to find a new C5707 or equivalent...
I had the same problem with a benq fp731 (same board as the 737), replaced the 4 c5707's (little black 3 legged transistors, they look like upright FET's, next to the little beige colored box shaped caps) and it fixed it.
Repair Help & Product Troubleshooting for BenQ FP731 17" LCD Monitor

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