this post was submitted on 08 Jul 2024
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If the computers have any value it would be better to just buy a new quality modern ATX power supply of the right size for the case (take dimensions for fit and ensure it's at least as many watts as the old one though it can be more) and do a drop-in replacement. Just make sure the power supply comes with some molex adapters and the maker usually sells additional cables if it's a semi or fully modular design so you could buy more molex plugs if the 3-8 they give you aren't enough.
That said power supplies can of course be repaired by anyone with soldering skills and sufficient electrical engineering knowledge and experience. They shouldn't be repaired by amateurs because they can store enough power to kill or maim a person who doesn't know what they're doing. It would be cheaper though to just replace the power supplies unless having all original/period equipment in the machines is important.