Thanks. I tested an unpopulated board and it showed no issues w/ power traces. It must be something I did, but it seems that it must have been under one of the ICs. Bugger. Will have to depopulate them and check.
Thanks! On Wed, Oct 18, 2017 at 1:22 PM, Stephen Adolph <[email protected]> wrote: > Josh, > my suggestion would be that, short of a board defect which is rare but can > happen, you have a solder bridge underneath one of the chips. > You also can have a chip soldered in the wrong orientation. that would make > a big problem. > > Steve > > On Wed, Oct 18, 2017 at 12:47 PM, Josh Malone <[email protected]> wrote: >> >> All, >> >> So, I just let the magic smoke out of my third REX build. Not sure >> exactly what went wrong yet. Hoping for a bit of help investigating. >> >> 1) Has anyone built a functional REX with the pre-castellated boards >> from OSH park. I don't think this is the problem, but hoping to verify >> >> 2) Can someone measure a resistance for me? I'm reading 2 ohms across >> 3.3v and gnd. You can measure this between the '3V3' and 'GND' >> connections at the JTAG port. >> >> Clearly 2 ohms is not right, and I haven't found what the problem is >> yet. I've de-populated the board of everything but the CPLD and flash >> and the resistance is still 2ohms. >> >> Thanks, >> >> -Josh > >
