Replacement mosfet?

[jerahya]

I'm trying to fix desktop motherboard with power issue. I found one bad mosfet which is k03b7 and want to know I can use my available mosfet as a replacement. My available mosfet are R464, R474, 4935n, 4939n and 889n03ms. I don't know much about selecting a mosfet and what could happen when selecting a wrong one.

Thanks!

 

[(*steve*)]

what could happen when selecting a wrong one.

Anything between the circuit benignly not working and smoke (with optional flames).

 

[kellys_eye]

Search for the data sheet for each device and compare the 'main' specifications which, in most cases, are Vg, Vds, Ids and Rds(on).

If you can match (or beat) the values then your alternative will do the job.

(disclaimer) see post #2 above.....