On my biostar P35D2-a7 Motherboard 2 FET type (On Semi) 58N02G (
http://www.chipdocs.com/datasheets/datasheet-pdf/ON-Semiconductor/NTD85N02.html)
blew, apparently the first one evaporated its drain leg, and the second
baked to death. I recall looking at the screen and the computer appeared to
be still running when we noticed the smell and turned it off!
I wonder what might cause this type of failure, and whats the probability
that just replacing these transistors could fix the problem?
There is also a third different FET in that group
http://www.alldatasheet.com/view.jsp?Searchword=FDD8780 which looks
unharmed.
I can see no nearby controller or gate driver!

Also if I can find compatible transistors, any tips on how to solder these
type of tightly spaced SMD components?

Thanks!

Tobias
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