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.
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https://www.zeusbtc.com/manuals/Antminer-APW8-Power-Supply-Repair-Guide.asp If not, hire an Electronics expert to repair your PSUs.
I’d go a step further and say if the metal capacitors by the power rails look exploded or leaky this is the only repair you can make without the electronics expert. They are the aluminum capped ones with the blue or red striped on the side.