Hi all,
I am very disgusted with S4 quality. I ordered 10 psc, 6 working fine (not well) 1 miner have a lot of xx in Asic status (more than 60 xx) and 3 PSUs burnt. I am really curious how bitmain will compensate ours losses! I do not recommend S4 for buy.
I enclose pics of burnt PSUs.

Have you powered the unit(s) with the burned psu on 220-240V or on an ~110V line?