![]() If this doesn't help, check the transformer. In this case, check for loose parts (espcially the PCB on top of the transformer) and try and fasten them. The other (more likely one) is just a mechanical annoyance: The metal sheets or the copper windings (or some other parts) in the transformer have losened over time and start vibrating with the AC frequency. ![]() This case is dangerous and a fire and electrical hazard! It's unlikely you could have measured a stable output voltage in this case, but it's still worth checking carefully. One (luckily the unlikely one) is electrical current jumping an air gap in the PSU causing intermittent shorts through an arc.
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September 2023
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