wrote:

With switchmodes going into spasm lift/break one rail at a time until
it doesn't spasm/shutdown.

You mean actually *severing* paths on the PCB? Isn't that rather
drastic? :^)

AFAIR the original post did not point
exclusively to the PSU. Just that it shut down during power up.

It shuts down even w/o load (DC controller & motor unplugged) so
there's *gotta* be sumptin' wrong with it...

The two optocouplers (TLP634) were mentioned -- anyone got a pinout or
point me to a data sheet? Apparently they're not readily available for
download (at least where I looked). Thanks!

--GanjaTron