A reminder that bad PSU s aren't always down to bad caps! Have a "Winpower" PFC VV-350 here that was showing all the signs, viz. intermittent operation (or not), sudden shutdown, etc, and, occasionally, no problem at all! Clean as a whistle inside - no bulging caps, no burnt tracks, thermal cutout not even fitted (!). Just a dry joint on an emitter diode - I think, ie unless the problem returns.....
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Dry joints - an old friend returns to bite the unwary.
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