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
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Posted on Jun 18, 2008
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Posted on Jan 02, 2017
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