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The MOSFET it self (the actual part that does the switching) is toasted. That is typical for N-FETs to burn closed (let the current flow).
You can change it if you know how to solder... most probably surface-mounted though.
But if it burnt, there is a reason. If you replace it with an other one, it will burn again.
A good modification that is seldom done is to install a high power stocky diode across the motor poles. That will soak a lot of the EMF that is harmfull to the MOSFET. Most higher grade FETs have a diode built-in... but when it burns it brings the whole FET with it.
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Originally Posted by Drake
Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.
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