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 "
log
" sequence.
Cheers,
J