Had a partial failure of a D3 Hashboard. Lost 5 of the 60 chips, and had about 10k of HD's on that board.
Followed the Bitmain instructions, sent in a picture of the serial # some screen shots they wanted, located the board, and sent it in.
Took about 10 days, and I got the replacement board today. (Warranty repair.) My only cost was shipping the board.
Had been over on EasyHash when this site was having problems, but really
do not like the cost of getting the BTC's.
So will be back up and running here tonight and see if I can make any money. Dropped my clock speed to 487 from 531. This dropped my PCB and Chip temp by 6 and 13 C.
Still clocking at 17.7 GHz.
We shall see if it will pay the electric bill with these low prices.