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honestly if you don't know how to solder well, and don't understand what a mosfet is you're going to have a hard time. First of all you're going to make a mess de-soldering it, especially if its one of those fancy pre-packaged ones with lots of surface mount components around it. Second, its not a drop in replacement, meaning you can't just stick in there whatever you have lying around and hope it works (how much current is is rated for? Is it a P channel or N channel? how much voltage is required to open the gate, etc...) You can replace it with one that has similar specs and the same body shape, but you may not be able to tell just from looking at it if its broken.
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