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Well that's a bummer. I pulled the MOSFET and quickly realized that it wasn't the problem. I took a bit of a different approach than you and bypassed the fuse and MOSFET to see where the current was going after those. The ARM now glows in the IR camera which isn't very promising. I was too lazy...

Upon further inspection, including an IR video that is too large to post, it appears that the MOSFET Q1 has failed and is shorting to ground. The hottest point on the board is F1, which I now know is a fuse, and the remaining hottest components appear to be Q1 and L2. So it appears that current...

Hello, I was curious if you happened to have found the solution to this issue? I'm having the exact same issue and have now toasted two boards. I've attached IR images of the two boards under USB power and the majority of the heat seems to be going through the component just to the right of the...