On Wed, 17 Feb 2016 10:53:18 -0500, legg wrote:

If you're confident that the high voltage bulk electrolytics are
functional, you should probably just apply normal mains input to the
fully loaded psu. This may allow it to function normally, if no stupid
substitutions or errors have been created by earlier meddlers.

Already double-checked that yesterday, just as you suggested above.
Exactly the same thing happens as when the smps board is out and on the
bench and tested separately.

Based on your response (or lack there of) to earlier suggestions, I can
only suggest now that you review previous posts on this subject. I
personally couldn't go farther in troubleshooting this unit without
running through those steps or gathering that information.

The original thread was packed with suggestions I'd already tried from
people who clearly hadn't read all the posts. I don't blame them for
that, of course, it became rather long and convoluted and I had trouble
keeping track of it myself.
I shall continue to work on it as time permits, but it's a challenge for
me having zero experience with switchers before and not knowing what's
been done to it by previous technicians. The fact that it's been 'got at'
by others adds an extra layer of unknowns to an already tricky set of
problems.

Best of luck anyways

Thanks, I'll need it.