Hello all, picked up a Midway Space Invaders that had some issues. First was someone pried on the flyback copper retaining rod and broke it clean off (not sure what the thinking on that was). But thats another problem for another day as I have another chassis/flyback retainer I am going to use. My main issue here was the game board. Upon plugging into a deluxe space invaders cab, I get a immediate constant loud humming with space ship sound but no image/coin up or anything else. So we replaced all caps (using radial caps instead), reflowed all connector solder, reflowed board interconnect socket, cleaned and reseated all roms/processor, even tried installing the braze kit (with eproms still seated and using the known working deluxe's processor)....all to still the exact same thing with no image and a loud humming sound mixed with background saucer sound.
Swapped boards out and confirmed its the motherboard and not the daughter/sound board. Yes we are getting neck glow as well as this is in a working deluxe cab and not in its original standard cab with flyback issue. Also, this being in a working deluxe cab....the power supply is known working as well. This board is insanely clean...I mean INSANELY!! Like fresh off the conveyor clean. All solder joints and traces are pristine. I see maybe 1 chip that seems to have been replaced, not sure on factory or not. What makes me scratch my head is that even with or without the braze kit installed....which has a ram/rom/fault checker...I should atleast get a test screen or beep letting me know if a fault is found, which leads me to believe that there is a problem before this so its not getting the right signal out of the gate.
Anybody have any ideas or have had a similar situation?
Swapped boards out and confirmed its the motherboard and not the daughter/sound board. Yes we are getting neck glow as well as this is in a working deluxe cab and not in its original standard cab with flyback issue. Also, this being in a working deluxe cab....the power supply is known working as well. This board is insanely clean...I mean INSANELY!! Like fresh off the conveyor clean. All solder joints and traces are pristine. I see maybe 1 chip that seems to have been replaced, not sure on factory or not. What makes me scratch my head is that even with or without the braze kit installed....which has a ram/rom/fault checker...I should atleast get a test screen or beep letting me know if a fault is found, which leads me to believe that there is a problem before this so its not getting the right signal out of the gate.
Anybody have any ideas or have had a similar situation?


