asteroids deluxe g05-802 problems

starfighter2

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So my ASteroids monitor is not working any more and have run out of ideas on what to look for next. The connectors have already been resoldered, I replaced the bridge rectifier (DB100 i think) and the bottle caps on the side casis. All the fuses check out ok. I see the nect tube light on but the I have the dreded spot light killer on which is preventing the picture any ideas on what to check next?
 
So my ASteroids monitor is not working any more and have run out of ideas on what to look for next. The connectors have already been resoldered, I replaced the bridge rectifier (DB100 i think) and the bottle caps on the side casis. All the fuses check out ok. I see the nect tube light on but the I have the dreded spot light killer on which is preventing the picture any ideas on what to check next?

Have you run a selftest on the board or hooked the boards up to an oscope? My Battlezone did the same thing... no matter what the spot killer stayed on. When I hooked the boards up to the scope I could see the game kinda running (would flicker a lot), but wouldn't show up on the monitor. When I put it through it's selftest it popped out a RAM error. Replaced that RAM and everything started working. Apparently it was keeping the boards from putting out a steady enough signal to make the monitor work.
 
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