Re: mosfet question
I am working on a motherboard, with two mosfets which got very hot. I removed them, but I could not find replacements. They are P-channel mosfets with the same pinout as a 4407, so I tried putting two 4407s in place, and they just hissed at me and got hot.
I had once observed a motherboard which had two mosfets "jumped" - from source to drain. There was a tantalum cap separating the two. Presumably, those mosfets where bad. It seemed like a good idea. I removed the 4407s and connected where source would be to where drain would be - with no success.
Is jumping mosfets like this a reliable way of working around a failed pair of hard to find mosfets? If so, why have my attempts been unsuccessful?
... More information:
The original mosfets were "tpc8107" - manufactured by toshiba. They are P-Channel Mosfets. The board is from an Asus notebook, G1S.
With my DMM, when connecting source to drain caused no short with 19V detected. During on experiment, I connect the source to drain, the other way around - and no voltage was detected. However, when I connected S-D both ways around at the same time, a short was created. I probably shouldn't have tried this, but am curious about the behavior of this circuit and want to gain some more insight.