Ok, I see no obvious marks on the back of the board as with shinychrome0's amp...and the tracks look undamaged.

Time to start from the beginning of this thread. Any info aiming me toward the most obvious failed parts would be appreciated.

I realize this topic is ancient, but I have the same issue with an xt65r.

I picked it up cheap today, and It just hums...I checked the fuse, and it had a 5A instead of a 2A...So I am guessing too much current cooked something on the board.

I believe I will try Q19 first in hopes of getting lucky.

If that doesn't take care of it, I will perform all of these same steps as shinychrome0 was directed.

My fingers are crossed.....