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 >
