Antminer Z9 hash board troubleshooting method: First you need to check the log. If setting the address fails, you need to check the TVS, resistance, and capacitance around connector J3 for shorts or open circuits. Then check U2 and surrounding resistors and capacitors for open or short circuits. If you still can't solve the problem, please go to the forum to find more solutions.
https://bbs.zeusbtc.com/forum.php?mod=viewthread&tid=53