I've been working on this issue for a couple of days.
https://github.com/MagpieModular/microB ... 0Build.pdf
https://github.com/MagpieModular/microB ... r/Hardware (need DipTrace Freeware for the .dch file)
So, my 7805 gets ridiculously hot in like 20-30 seconds. Like, I can't get my finger off it quick enough hot. So far I've gotten in my brain that it's a short... somewhere. (probably) So far what I've gotten from multimetering the shit out of this board:
Voltage test on input is .3V
Voltage test on output is 0V (??????)
Impedence from 5V to GND is 15.4k.
I get continuity from the 5V output to Pin 2 of the 74HC4067. I don't know which cap is C32 (board isn't labelled, it isn't the cap below it) but if I get continuity to pin 2 I think it's safe to say the short isn't there.
I get continuity from the 10 pin header -> Diode -> 12V input.
If I'm getting continuity in and out of the 7805, that should indicate it's not a short here right? Could the problem be that I need an input capacitor for some reason (although others don't). This makes no fucking sense either, but I'm picking at clouds here and I'm about to start running in circles. I've taken a hot air gun over the board for reflowing purposes to make sure I didn't have a shitty solder job somewhere.