Robotron goes blind after a while

Don't know yet. My guess is the monitor chassis as the game does seem to play blind when it turns off.
As long as the game is running, your problem likely isn't the game pcb. Still think your b+ or something is adjusted high causing shutdown. Sometimes the b+ gradually climbs as a monitor is on could make it shut off if it's adjusted high to start. If you could measure the b+ when the game first starts, after running for a bit but before shutdown, then during shut down.
 
As long as the game is running, your problem likely isn't the game pcb. Still think your b+ or something is adjusted high causing shutdown. Sometimes the b+ gradually climbs as a monitor is on could make it shut off if it's adjusted high to start. If you could measure the b+ when the game first starts, after running for a bit but before shutdown, then during shut down.
we can't even go this route yet cause he doesn't even know what monitor is in it
 
I already said it was a G07
I missed that memo, I was kind of away at Pinball Expo for days and immediately had to go back to work. my bad

G07s are funny, people go crazy over adjusting B+ on them, many I've seen to achieve that 120V the pot is just maxed out. it can't really go higher. I've also never needed to replace a voltage regulator on one. like I said, G07s are funny, they have like 12 transistors that do who knows what unless you're an expert in the art of them. like @tron guy .. you should probably seek his advice. I honestly don't care about them enough to learn, of the 1000 things, I can do 997 of them. G07s are one of the 3.
 
I have seen 25-50 or so bad in the 500-1000+ I've worked on, so it is a bit rare. I've noticed them sometimes just BAD. Other times, they are "going bad" meaning, I see a b+ voltage of like 134vdc, non-adjustable, and the VR measures something like .112 in circuit vs the typical .450 (diode test), and still produces an image. Again, this is even more rare.
 
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