Thanks for the input Leonard.My guess would be a cap with bad DA or a reset circuit that is malfunctioning. DA is also known as "battery effect" and will result in a cap voltage RISING after it is discharged. It can create some unusual effects and is not uncommon, even in new caps. A DA of over 15% is considered bad, but I have tested caps at around 10% that would not work in some circuits.
Can you elaborate more on the diode array issue?
Are you referring to the diodes in the bridge rectifier arrays I mentioned before?
I also don't understand how a faulty array could result in a caps voltage rising after discharge.
Does it have anything to do with the faulty array preventing current from flowing?
And how would unplugging the X&Y-SUS from the PS correct this problem?
I have tried to find reading material but have found none (regarding diode arrays and battery effects).
There is a section in the SMPS Repair ebook about Over-voltage, Over-current and Over-temperature protective circuits on power supplies. While I understand the concept I am having a hard time finding it on this circuit board. Maybe because these protections are built INTO other components (I've read) and I don't know what to look for.
Also, if I read your last sentence correctly, you are saying that you have seen caps that read +/- 10% of their target rating and still failed to work properly in some circuits? I find that astonishing since most caps I have seen state that +/- 20% is acceptable.