My dual FSESC 4.20 stopped working (one side only), and can not be programed - it supplies 5v fine, but 0v on the 3.3v line - and if I plug my external programmer in, the programmer shuts down (the 3.3v problem seems to be a short - which is why the programmer "gives up", because it can't supply 3.3v into the short).
The same programmer worked fine on both sides before, and works OK on the working side.
Obviously, the USB doesn't work at all on that side either.
I assume there's something that outputs a regulated 3.3v? If yes, what is it, and where? Can I replace it? (I've done SMD component replacements before).