I apologize ahead of time for necro'ing this thread but this thread may be most relevant to my post.
My Z11 decided stopped running after nearly a year of running (with some downtime in-between). Nearing the time of failure, it kill a PSU and an additional 2 other used PSUs. Found 2 out of 3 hashboards reported 0 ASIC detected. Fitted and ran the one working board into another Z11 and it reported 0 ASIC detected after a good 20 minutes.
Upon visual inspection of the boards, I found some similar patterns/position of black spots across all the 3 boards.
Some pictures for reference :
https://imgur.com/MAjHzafhttps://imgur.com/vgGbum9https://imgur.com/WK4yVu3https://imgur.com/TCohFM6Full album here :
https://imgur.com/a/U0muvjVI want to ask for assistance in identifying the black spots as well what could have possibly caused the failure of the boards. I hope to mitigate the issue for my other miners too.
Thanks in advance!