You can try to repair those dead PSUs there might be burned parts inside the PSU sometimes busted capacitors or rectifiers or maybe an open fuse replacing them could fix the issue.

I searched a bit it seems that ZeusBTC has a guide on how to repair this PSU so I suggest you follow their step-by-step guide from this link below.

- https://www.zeusbtc.com/manuals/Antminer-APW8-Power-Supply-Repair-Guide.asp