Just thought I'd see if anyone knows of some common problems and fixes,
before spending any great deal of time or money on this. Sometimes the set
starts for a while then quits, other times the switching supply will sputter
for a few seconds and fail (the red diagnostic LED then lights brightly). No
cold solder to be seen, and the caps all check good. I'm leaning towards a
bad switching regulator IC (STR-M6511) and/or optoisolator, but I'm really
not sure how to confirm this without replacing anything. Disconnecting the
loads from the secondary side of the supply (one at a time) does not change
the symptom.
Thanks for any advice.

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