Bullwinkle
Member
OK, picked up this non working Galaga board. Previous owner mentioned there were video issues with it and only tried reseating socketed chips but that just made it worse. So I figured sockets and replaced all sockets on the CPU board. Next I just took a quick once over on the socketed chips on both boards and noticed the custom chip at 4M on the video board is in backwards! popped it out and put it in properly but my guess is, it was powered up this way (probably what made it worse). I also am going to guess that whatever voltage was applied to this chip going up the wrong pin probably did the chip in. I don't have a galaga machine, but do have a JAMMA to Galaga adapter so I hooked it up to see what I have. Yeah, video issues for certain.
1. Is it possible the custom chip survived
2. Is there anyplace I can procure the chip for that location
3. The video below shows what I'm getting now. I have replaced all sockets on the CPU board, but not the video board yet. I've also reflowed solder on the CPU board. Any suggestions on where to start looking?
1. Is it possible the custom chip survived
2. Is there anyplace I can procure the chip for that location
3. The video below shows what I'm getting now. I have replaced all sockets on the CPU board, but not the video board yet. I've also reflowed solder on the CPU board. Any suggestions on where to start looking?



