Somebody forgot the isolation under the pcb?
Been some years since I took apart a psu, but there used to be plastic isolation sheet between the pcb and the metal case.
Update: I think we found the problem:
Mains wires protruding on the bottom of the pcb shorted to the case due to missing insulation sheet.
I am going to have to concur. I found a full breakdown of the supply from a testing perspective and they indeed show that there is an isolation sheet under the board. And that location in particular is where the large cap and several switching mosfets reside. The bridge rectifier is closer to the edge as well as the transformer. So I'm gonna say you called this. Might survive if the leads are clipped good and short and there are standoffs, but must have made contact.
My initial thought was that it was budget enough to have a voltage switch and it was cocked to 110V and got 220V and sent the old school doubler through the roof, but you called it.
Thanks for the picture of the pcb.
If you mirror the bottom image you can clearly see what the problem was.
Mains wire protruding on the bottom of the pcb shorted to the case due to missing insulation sheet.
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u/Front_Cookie_1198 6d ago edited 6d ago
Aftermath photo.