Bitcoin Forum

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.

There is no fixing that yourself, you will have to send it off to be repaired.

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 have the same thing going on, one S9 and two R4's are reporting a board with less then the normal chips according to bitmains website this appears to be a 'chain scission of chips" and to return to china for repair. They don't want just a board, now it's the entire miner and that's $70 bucks pop... $210 don't know if it's worth it

Anyone have any ideas?
Suggestions?
Tell me where to go (lol).

Thanks

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.

I forgot about this topic.

I ended up sending my bad board to BitmainWarranty and they fixed it, cost about $200 but it is running again.  I do get more HW errors than before, but fuck it...it is hashing.

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.

$200?  Was that shipping and under warranty?  or just repair cost?  What's the dollar break down.    I still have about 4 months warrenty left or I might just sell these off on eBay as defective .

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.

Aside from the T9's being vastly louder, great resolution for you! The T9's should be faster and more to the point so far seem every bit as reliable as the Avalon's eg near bullet proof as long as you keep a reasonable inlet air temp. Keep it less than 95F and they are quite happy.