Bitmain Warranty did not say what the problem was. The board they repaired is still running fine 3 months on.
I was a bit surprised as I thought they may just return me any old repaired board but it was actually the same board I sent out there. I recorded the board serial number before it went and the same board came back Smiley I did have to mail them quite a few times for status updates and the were a bit slow replying to mails.
It cost me £18 to ship to the US $175 for the repair, $25 for the postage US to UK and then, the real stinger, £46 import duty.
If you look real close to you see any new chips? Board modifications? I'm doing S9 board repair and the problems that cannot be seen cosmetically are always the most difficult. I'm always gathering information on past repairs (there's no sense in reinventing the wheel).
When the board came back from Bitmain Warranty I had a good look at it and there were no signs of anything being done! Having said that when I took it out the miner there was no sign of any issues.
I now have 2 boards that have stopped functioning, (from my other S9) both power up but show a shorter than normal ASIC status list of 0000 0000 in the miner status web page.
I have switched around control and power cables, but all attempts result in the same display output.
I was just about to send them off to Bitmain Warranty (strangely re-branded as myRig.com, I guess the real Bitmain objected to the use of their name?)
Are you still fixing boards? PM me.