benq fp91g+ (q9t4) monitor not turn on

benq fp91g+ (q9t4) monitor not turn on

Joined: April 16th, 2013, 5:50 pm

April 16th, 2013, 5:53 pm #1

benq fp91g+ (q9t4) monitor. Mostly wont turn on. Once in awhile it does and works fine. However, that's very seldom. The on off switch hot side is 3.3vdc. The switch grounds that when its pressed and my dvm then reads 0vdc. Every time. Ive traced it to the display circuit board plug,
gray wire. So, it goes from 3.3vdc to 0vdc when the switch is pressed - Every time. Over and over I can do this and every once in awhile, the unit powers up and it works fine. however, the next time, it wont power up.

Any ideas what could be wrong? All the caps look fine. Ive also inspected all solder joints.

tks,
pa

PS note that I registered and it said wrong when I try log in, and lost pswd said my email not there, so i had to register a 2nd time. please fix site.
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