DarkWolf896
New member
I bought a defender from a friend a few days ago. It didn't work the 4700mfd cap on the PS
was loose from the board. I replace it and the 5 other ones in front. as well as the 3 radial ones on the cpu board. I still wasn't getting anything so I removed the cpu board and examined the chips. the 7474 were so corroded when I tried to remove them, the pins snapped off. so I replaced the sockets and chips, and now it plays the start up sound. but the monitor shows wight with lines on it and nothing else. I also checked the voltages from the ps, 5v regulated read as 5.14v, -5v read as -5.12v, 12 unregulated read as 12.84v, 12v regulated read as 11.75v. this is my first time working on an arcade machine so I'm kind of lost...
Video of problem: http://www.youtube.com/watch?v=o60BO82OcmY
was loose from the board. I replace it and the 5 other ones in front. as well as the 3 radial ones on the cpu board. I still wasn't getting anything so I removed the cpu board and examined the chips. the 7474 were so corroded when I tried to remove them, the pins snapped off. so I replaced the sockets and chips, and now it plays the start up sound. but the monitor shows wight with lines on it and nothing else. I also checked the voltages from the ps, 5v regulated read as 5.14v, -5v read as -5.12v, 12 unregulated read as 12.84v, 12v regulated read as 11.75v. this is my first time working on an arcade machine so I'm kind of lost...
Video of problem: http://www.youtube.com/watch?v=o60BO82OcmY
