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Seems I may have a dead board too 
Was running fine till last week, the last 6 chips decided to x, but the device seemed to be ok with the remaining 54, had it set to under 400 freq with no errors. (Tried to change voltages and feq and flash back to stock, still same last 6 died shortly after starting to mine.)
Few days ago the chain disappeared completely, but I could see it was still working by the total hashrate. Now its totally dead, hashing power nor the chain showing up at all.
Have tried resetting defaults, flashing back to stock, resetting again, flashing back to Blissz, underclock to 200 and set voltage to 13. Even opened her up to check, but nothing appears off.
Debug reports 0 ASIC for that chain, and the only thing I can see that is different is the temp sensor listing offset to 00 for that chain.
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain2 Sensor0 temp offset : 00,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 0 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 0 set_temperature_offset_value_chain_sensor
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain0 Sensor0 temp offset : -2,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 1 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 1 set_temperature_offset_value_chain_sensor
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain1 Sensor0 temp offset : -2,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 2 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 2 set_temperature_offset_value_chain_sensor
Jan 14 08:25:56 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain2 Sensor0 temp offset : 00,
Any other things I can try before I unplug it completely and just run 2 @ 500watts at least
Was running fine till last week, the last 6 chips decided to x, but the device seemed to be ok with the remaining 54, had it set to under 400 freq with no errors. (Tried to change voltages and feq and flash back to stock, still same last 6 died shortly after starting to mine.)
Few days ago the chain disappeared completely, but I could see it was still working by the total hashrate. Now its totally dead, hashing power nor the chain showing up at all.
Have tried resetting defaults, flashing back to stock, resetting again, flashing back to Blissz, underclock to 200 and set voltage to 13. Even opened her up to check, but nothing appears off.
Debug reports 0 ASIC for that chain, and the only thing I can see that is different is the temp sensor listing offset to 00 for that chain.
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain2 Sensor0 temp offset : 00,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 0 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 0 set_temperature_offset_value_chain_sensor
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain0 Sensor0 temp offset : -2,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 1 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 1 set_temperature_offset_value_chain_sensor
Jan 14 08:25:55 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain1 Sensor0 temp offset : -2,
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 2 set_temperature_offset_value_chain
Jan 14 08:25:55 (none) local0.warn cgminer[376]: Chain 2 set_temperature_offset_value_chain_sensor
Jan 14 08:25:56 (none) local0.notice cgminer[376]: set_temperature_offset_value_chain_sensor: Chain2 Sensor0 temp offset : 00,
Any other things I can try before I unplug it completely and just run 2 @ 500watts at least
sounds to me like a dead board that needs to be shipped back to bitmain, but you can try one more thing: try to connect it as first board and then disconnect the working ones. Try swapping the communication cables as well.
Yup, gave that a shot too, no luck. Oh well. Tried with different cables, different slots.
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