Having problems with your ViewSonic VA902b 19" Monitor ?

Picture problem on my viewsonic the power is on and signal is plugged in but the picture will flash really quick and then picture screen turns immediatly blank


Answers :

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.
Dear friends,

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
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