"N Cook" writes:

Eeyore wrote in message
...

N Cook wrote:

There are 3 HF transformers

More likely one transformer and 2 chokes, unless you have a specific
reason to say otherwise.

Why would chokes bridge the "no man's land" isolation strip between HV and
LV areas ?

No, probably transformers instead of opto-isolators (on the feedback
and drive).

Personally, I wouldn't even attempt to do any serious troubleshooting
on a supply of this type unless there was no inexpensive replacement.
I would check the obvious - ESR of e-caps, open high value startup
resistors, and such. But beyond that, these tend to be infinite
frustration sources.

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