I cannot get any of the IO parts of my Pixhack (RC, servos) to work, yet mavlink and general control works. Looking at bootlog, I see:
ERROR: PX4IO update failed
ERROR: PX4IO not found
Having looked online, there are a few suggestions this could be due to old firmware on the board (unlikely, board is new) and that holding safety switch whilst booting should fix the problem; it doesn't. Also a few forums suggest that the 3.3v regulator could be blown. This is possible, as I made a couple of mistakes early on regarding power supply.
Is there a schematic/guide/somewhere I can find out where the 3.3v regulator is, how to test it, and how to fix it? Most forums regard the Pixhawk, so slightly different board design? I have a multimeter/scope handy.