I finally got around to working on Galaxian yesterday for the first time. When the screen comes up, you can see the stars moving in the background and it has random sprites moving/circling around the screen kind of like in a figure eight pattern. It will not allow me to go into test mode, and it has a constant drone in the sound. Any help would be appreciated! I have cleaned all the chip legs the best I could on the inside and outside but still the same outcome. I noticed that chip at 3C looks like it has been replaced before, and also at 6D...
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