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Deep-fried FET
I believe there is a separate FET for forward and reverse.
I've burnt out a Mini-Z's forward drive.
If you take the case off, you should be able to see a bubble/dicoloration on one of the large chips near the motor leads.
They are replacable with stock chips from (oddly enough) Radio Shack, and a little TLC from a point tipped iron.
I have heard that if you upgrade forward with a better FET, you'll also have to upgrade reverse. Something about off-resistance, but that might just have to do with FET stacking.
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