gunsablazin
New member
game boots up fine 4 leds on ROM board blink twice and the go out. game plays but the screen is flashes complete red and then complete yellow. you can hear the game playing perfectly fine, but just cant see it. now every now and then the video will pop up perfectly clear for a few seconds and then back yellow and red flashing !!!
Things ive checked/done
1. checked all connectors/wires
2. checked for cold solder joints
3. socketed CPU and Video Decoder chips
4. switched 6809 cpu out- same problem
5. switched video decoder chip- no help
6. reseated 5101 chip
7. swapped known good monitor out
8. ???? and a lot of hoping praying and crying...
Would the problem be in the video RAM chips (7489)?
Could it be the ROM board at all?
What other chips on the CPU has to do with the VIDEO????
IT's Basically an Intermittent problem....which are the worst kind to locate :-(
Things ive checked/done
1. checked all connectors/wires
2. checked for cold solder joints
3. socketed CPU and Video Decoder chips
4. switched 6809 cpu out- same problem
5. switched video decoder chip- no help
6. reseated 5101 chip
7. swapped known good monitor out
8. ???? and a lot of hoping praying and crying...
Would the problem be in the video RAM chips (7489)?
Could it be the ROM board at all?
What other chips on the CPU has to do with the VIDEO????
IT's Basically an Intermittent problem....which are the worst kind to locate :-(

