Question about BenQ FP731 17" LCD Monitor
I just bought 2 non working 17" lcd's for $10. I've challenged myself to fix them. I took them apart and one main board has a number of blown caps, the other looks fine. The one with blown caps would not power up, the other powers up but no picture whatsoever from vga, hadn't tested the dvi yet.
I took the video input board from the non powering one and put it in the powering one. I now can see the BENQ at startup very dimmly, but only with the dvi input. My first thought, the backlight. So I tried the screen from the other monitor in the now working chassis (LG PHILLIPS 170E01 A5 screens in both, btw). Same deal, saw the BENQ faintly but still all black.
I plan to replace the caps on the blown board and I may need a second input, although I will test the other one now that I know you can see the BENQ from the dvi input like that.
Do you think it's likely, given what I've described, that both backlights are out? or is it more likely that there's a power supply problem on my main board, if so, can anyone suggest how to test my backlights on their own and/or how to repair the board if that's the issue. I think I may start by replacing all the caps on both boards... thoughts?
How old are the monitors?
Normally backlights last at least 30,000hrs of working.
Normally problems on Inverter board transistors near yellow inverter transformers.
Posted on Feb 27, 2008
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