Need Help Troubleshooting C64
Bought this broken because I wanted to learn about it. I’m not sure where to start and what chips to test. I’ve watched a few videos and read some guides but I haven’t been able to make a decision.
I’ve attached a video turning it on with the dead test and diag cart + no cart.
The only “repair” I’ve made so far was replacing and socketing U14 but I still get the same results/glitches.
The power supply looks to be original. I measured the voltage on the lines and it seems within spec. I think I’ll get a new one anyways.
Running the video signal through the RF modulator or the DIN produces the same issues.
I’ve let it run for 15 minutes and none of the chips feel like they’re burning up. The VIC get warm but I’ve tested it with another VIC - same issues.
The only thing that’s immediately concerning are the traces on the bottom. They’re pretty rippled but the continuity between each point seemed good. I’ll try to post more photos…
I also have a scope that I can use to test data lines. I haven’t found a good guide or data sheet to follow yet.
If anyone has any ideas what I should try next or what resources I can follow that would be greatly appreciated.