ballytablewiz
Well-known member
I have a Circus Charlie PCB that displays garbage. For the first minute or so, it flashes between the screen of garbage I photo'd and a screen full of zeroes. After warming up, the zero screen stops appearing.
From my work with Nintendo stuff, the zero screen is bad cpu, but I don't even know how to identify what kind of CPU/s Konami used on this thing, since they lovingly scraped off any identifying marks and just labeled them "Konami." I also have a badly busted ceramic capacitor right next to what looks like a CPU, which is what I'm thinking causes the zero screen to show during warm-up. (Then again, I've had tons of boards with busted round ceramics that worked fine, so wtf do they even DO anyway?)
Audio is also nonexistent, and coining up changes nothing on-screen. I pulled, verified CRC's with my burner, and reseated every EPROM and they all check out.
Anyone have any ideas for me? And if anyone knows what kinds of CPU/s they used, and this other custom IC (plus where to acquire replacements), that would be swell. See photos 2-5 for chips and relative positions, photo 5 for disc cap, photo 1 for garbage screen.
From my work with Nintendo stuff, the zero screen is bad cpu, but I don't even know how to identify what kind of CPU/s Konami used on this thing, since they lovingly scraped off any identifying marks and just labeled them "Konami." I also have a badly busted ceramic capacitor right next to what looks like a CPU, which is what I'm thinking causes the zero screen to show during warm-up. (Then again, I've had tons of boards with busted round ceramics that worked fine, so wtf do they even DO anyway?)
Audio is also nonexistent, and coining up changes nothing on-screen. I pulled, verified CRC's with my burner, and reseated every EPROM and they all check out.
Anyone have any ideas for me? And if anyone knows what kinds of CPU/s they used, and this other custom IC (plus where to acquire replacements), that would be swell. See photos 2-5 for chips and relative positions, photo 5 for disc cap, photo 1 for garbage screen.