To recap: The voltage regulator on my //c died and fried the fuses in both the PSU and the motherboard. I spent about a month or so trying to trace the faults, found several, but not all. So I replaced the regulator! So now my //c is back and running!!!
So far, I've replaced the DUV26 Transistor at Q2, the HA17339 IC, all of the electrolytic compactors, and the regulator abled IC2 (not sure why it was abled that way). I've also checked all of the diodes in and out of circuit. Basically, I've been poking blindly as there are no schematics online for my particular regulator (Astec AA 7343A). Hopefully, the working one will point me in the right direction.
So far, all is good. However, I noticed that the text has a noticeable rainbow-bleed on the screen. Admittedly I'm using an old SAHRP CRT TV from the '90s, but it's still a bit more severe than it should be. I remember a similar issue just before the old regulator died. It took several years. And at first, I thought it was just the natural result of having been in storage for more than a decade. But then it got really bad the day it died. Then the video started to cut out, and it just shut off and wouldn't power on again. So I'm a little concerned about this. As such, any suggestions on how to keep my beloved //c healthy would be appreciated.