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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