I just had board 3 stop hashing and is now only reporting 13 out of 63 asics.  While reading up on Bitmain forum it says I have encountered "Chain scission of chips" and to remove board to repair?  Has anyone else had this issue and how did you fix? 

Hoping I don't have to ship off for repair.

Thanks.

A few causes of chain scission I'm aware of:
- Asic chip is burnt and short circuited
- Capacitors around the asic chip went bad
- Incorrect voltage to asic chips
- Bug in firmware

Basically boils down to either the asic chips themselves aren't operational or the signal to the pic controller is impeded.  I'm having trouble trying to diagnose this issue on my own hashboards, it's very difficult to pinpoint the actual issue.

I'd just send it to them; seems nobody has figured out how to fix it yet. It's sad bitmainwarranty in Colorado doesn't do these repairs afaik, would be a lot cheaper :/ Bitmain has a pretty bad repair reputation but it's the best you can do at this point.

There's even people that get back broken miners after sending them to bitmainwarranty, better than nothing. How are temps? Could be why there's HWs, or just a bad repair. Avalon might be a better choice in the future, their products are more reliable in general than Bitmain's.

Just an update.  Bitmain exchanged the 2R4's with two T9's just cost me $80 to ship to their LA address and the S9 just starting working on it's own after letting the two other boards run for three months.