This was a quick hit project, it only took about an hour between putting it on my bench and getting it working. So before I even turned it on, I noticed that the crystal was broken, it is a 10MHz crystal, common enough. Without this it cannot do anything.

After replacing it with a modern one that doesn't stick as high up (so it won't break the same way again). I finally hooked it up and got nothing on the screen. Because of that I started checking clocks (especially considering I just replaced the crystal). I have 3 lugs right next to the crystal, 10MHz, 5MHz, and HSync. First I checked was HSync, that was suprisingly running at 62KHz instead of roughly 15KHz. Checking the 10MHz, that was fine. The 5MHz however was completely dead.

Looking at the clock circuit, the clock is divided by a 74LS109 at 6D. The input was fine, but the outputs were dead. The clock was just not doing anything.

Pulling the 74LS109 out of circuit and testing it, my tester confirmed that it was as dead as a doornail.

After replacing it, everything worked as it was supposed to.