Hey guys,

this card worked for about 3 years as a daily driver (wasn't OCed) when it started to crash the PC. It would just shut off instantly, like when it's a PSU issue. The PSU was fine though. I replaced the card and the problem went away.

I finally got around to repairing the card and traced the problem down to one of the Mosfets. The card powered up when I would leave the 8-pin out - the 8-pin powers the lower 4 GPU Mosfets - and sure enough, one of them was fried (no resistance between two of the pads). The card powers up fine with the 8-pin in now, although the lower 4 Mosfets are still out. 

 

 

First question: What kind of manufacturer is this and where can I get a replacement Mosfet? A datasheet would also be helpful I guess.

Second question: Should it already show a picture on the screen now with 4 deactivated phases? Voltages and everything look good. Or does this indicate there might be something else bad (like the GPU itself?) 
 

 

Edited May 6, 20206 yr by Masterchief79

Its a Fairchild fdmf 6823a mosfet. Ebay has them. Ive seen people remove fried mosfets and the card would run on the remaining phases. It would not be ideal. There is probably a power good signal from the lower 4 phases that keeps the card from starting if its missing.