should I be worried about the " FAILED" ? This particular S9 has one hash board stop working, a reboot fixes it for hours, or even a day, then sometimes goes back to one board not hashing.... been in operation since Nov 21 2017
chain[5]: All chip cores are opened OK!
Test Patten on chain[5]: FAILED!
chain[6]: All chip cores are opened OK!
Test Patten on chain[6]: FAILED!
chain[7]: All chip cores are opened OK!
Test Patten on chain[7]: OK!
I check my S9s 2-3 times a day. I have several that lose a hashcard which a reboot fixes - for awhile. Yes, its defective. No, its not worth sending back to Bitmain.