Question about ViewSonic VA902b 19" Monitor
I have the same problem... I replaced all the caps on the primary and secondary side of the powersupply. I found 3 Caps bulging on the secondary by the high voltage transformers. I have 15vDC on the 1000uF cap but I am missing the pulse to the transformers to switch them to make high voltage. Any suggestions? I replace the two 8 pin dip ic's (FET's) that drive the transformers and still no pulse.
Posted on Oct 26, 2009
I just fixed my Viewsonic VA902b, here is how.
1/. Remove the LCD housing
2/. Remove the Main Power supply PCB (label the 4 connectors for the 4 lamps before you unplug them)
3/. Locate the 1000uf-25v Cap (i think c806) check the top of the cap, if the top is bubble up then replace it. I replaced my with 1000uf-35V 105 C, use the cap with long leads, solder it to the PCB and lay the cap down away from the heat sink (there should be plenty of room)
4/ check all solder joins, if it look like cold joins simply re-solder it
5/ when you are done, you can apply power to the board and check for the voltage at the cap, it should read about 14.7VDC
6/. Re-install every thing and it should be good to use again
Please pardon my english. Good luck to all
Posted on Jun 26, 2008
Having the same problem, storm the night before? Mabye lighting
Posted on Jun 18, 2008
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Posted on Jan 02, 2017
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