Just wanted to share. I have a broken S5. One of the two boards overheated and stopped mining. I contacted Bitmain and they asked me to sent it to them. I asked if I could run the unit with only one board and was told that I could. They have had the board since August but I have not heard from them. The other board stopped working after a couple of weeks too. I reported this but still no reply. This is not good enough.