slartibartfast wrote: 
> If these big capacitors are on the DC side of a rectifier how would they
> send power back to the power lines?
remember most of these "cheap" devices doesnt have a  Transformer
Protector Diode like a laboratory power supply.
Only this diode will stop the current to go back.

Anyway The only thing that solves his proble is dismantle the PSU, check
everything or buy a new one.
There are too many may and be s what really happend.


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