Enermax EMD625AWT Pro82 II 625w

[28/02/22] I'd bought this Enermax EMD625AWT Pro82 II 625w Power Supply off Ebay as working, and I'm pretty sure I tested it when it arrived, but it stopped working.

Some investigating revealed that the internal 12A glass fuse had blown. From what I understand this will usually only fail if there is another fault but I tested it with another and it worked with my PSU tester. However, that fuse I installed for testing was too low a rating and I'd installed it in a plastic fuse holder that wouldn't fit when I came to reassemble, so I had to specifically purchase the correct fuses. Then when I came to do the final test with my PSU tester, I noticed that that was reporting that the 5V rail was low at only 4.5V (below the ATX standards).

I have not yet tried the PSU in a computer; perhaps this is why the fuse blew. I think it will be beyond my ability and patience to determine what component is out of spec. The capacitors look ok, so what could be causing the 5V rail to be low. In addition to this the tester reports a slow response time at 990ms, also out of spec.

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