I'm pretty sure both of those are for standby supply to the computer that enables it to turn on with the keyboard switch. In the several Mac IIsi power supplies that I have repaired, the main things that fail are the bunch of electrolytics at the output that filter 5 VDC . Those are C 201...
Hack Dog, Thanks so much for the post on repairing, Mac IIsi PSU problems. I am also new to this forum, but 2 years later. I have been puzzling about exactly the same problem You had for a week. I had repaired 4 Mac IIsi PSU's in the last several months by replacing the 1200 /uF's &...