Wednesday, April 29, 2009

ViewSonic VX912 repair

ViewSonic VX912


vx912

First sysmtoms were of no power. Found several swollen caps and repalced them. Afterward there was power, but the picture would only come on for a few seconds. There was also a loud buzzing sound that was coming fromthe power board. I reflowed a few solder joints and got the lights to stay on, but the buzzing noise was still there. The main transformer and large cap were also getting very hot. I suspected the xformer was the issue. After doing a bit of Googling (that just sounds bad, almost perverted!), I found another post suggesting that all caps be replaced. Included in this list was the 100uF/400v main cap. So I yanked mine out and hit it with my trusty Blue ESR meter. It gave no reading at all, as though it were completely open. I didn't know if this was a normal reading for such a large cap, so I pulled another from a spare (toasted) power supply I had. This other one registered on Blue ESR meter as having .668 ohms of Equivelent Series Resistance. So I put it in the Viewsonic and... VOILA!

No noise, no flickering, no smoke.

Just raw, unharnessed, Viewsonic picture power! Ya baby!

Additional info...

Powerboard # = FSP035-1PI01

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