it is not the issue with PSU because power lost error message is coming only with One board I even disconnect other boards and connect only this board and error still appears, once I disconnect this specific board and reconnect the remaining two device is hashing normally
so I think this board is already dead and shorted somewhere ,
Did you buy a used(2nd hand) miner?
If not, then you can send them back to bitmain for repair.
Can you try to check the hashboard physically and maybe there are some burnt parts under the power terminal. If not, try to clean the whole power terminal and some parts with lacquer flo thinner then try to run it again.
Also, you can troubleshoot the hashboard follow the guide from here
https://www.zeusbtc.com/articles/information/185-antminer-t17e-manual-downloadit is second hand miner I already try to clean the hash board but still didn't work , thank you for the manual I will go through it