As a fan of FPGA hardware I've picked up my share off offloaded hardware. The chips alone are worth salvage in any case. I've obtained two MMQ units. Both suffering from the same issue. A 100% dead board. Or what appears to be a 100% dead board. Little infomation is provided on cures. Has anyone played with these things as far as a refurbish?
Yes, I've mucked about with them.
A common failure for them is the DC-DC converter in the middle of the board burns out, and the chips no longer get the ~1.2v rail. The symptom of this is the board being alive and looking like it's working, but finding zero FPGAs when probed (bfgminer -d? --detail) will show you the FPGA probing step, and if you get zero on a board that has cards, the DC-DC converter is bad.
If the board is /totally/ dead, and doesn't power on the fans or start flashing the red "alive" LED, the fuse on the backside is likely blown - I've seen this more than once, and I believe it to be the result of an insufficient power supply. Voltage sags, amperage increases, the 5A fuse blows. Jumper it or replace it.
I have spare parts around and a bunch of known good parts if you're interested in having me test a few, or just selling them without having to remove the FPGAs. I used to swap dead MMQs for working ztex 1.15y clones, but I'm running out of those.
PM me if you're interested.
