Welcome to Mid-Week-Mini-Mail-Call #52! A generous viewer sent in several Commodore 64 motherboard that are in need of repair. Let's take the first step at doing a quick diagnosis on all of them.
0:00 Intro
0:43 Unboxing
5:12 Diagnosing the main boards
28:27 Testing MOS 6526, 6526A and 6526A-1 chips
32:59 Looking into some mystery EPROMs
36:34 Summary and conclusion