It is extremely unlikely that you have three simultaneous pic failures. It's more likely that the 3.3V power that is sourced by the control board to power the pic has been lost. To put it another way it is the control board that powers the pic and not any circuitry intrinsic to that particular hashboard.
Are you getting 3.3 volts on the hashboard data connector? Also, as a matter of best practices and expedience post your kernel log in a "#-button-above" sequence.
Cheers,
J
thanks a lot
but i fixed control board and all hash boards by change pics and eEproms and failure asics.
one of them lost mp ic and had temp problem.
after fix all, miner work with 80th.
Great news! I would still like to know what that control board did to those microcontrollers to make them all crap out. Maybe we'll see you back sometime in the future.