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Maximum Force Cabinet Works but No Video

EvilBean42

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May 30, 2023
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Philadelphia
Hello All,
I am a facilities tech and my company owns a few cabinets, one of them is a Maximum Force and doesn't currently work. Here is what I know, any advice is appreciated and I'm happy to do some further digging if you guys need me to check something.

Game used to work fully during the time we had it. We recently moved it to a new warehouse. A problem occurred at some point during the move, or shortly after.

Game operates, but the screen doesn't come on.

There is no neck glow at the back of the monitor.

The neck board does not appear to be getting power at all.

The deflection board has power coming in, and power going out to the display. Fuse is ok when checked for continuity, but power doesn't seem to be going through it.

All connections seem ok, there are no signs of any components frying.

The main board has either low voltage, or high voltage error LEDs lit. I've tried to adjust the power supply but there is no gap between too high and too low. I've gotten it to the point where one is out and the other will just sparkle dimly, but I can't get them to turn off completely.

Could it just be the power supply or do I likely have a chassis issue as well? What is the likelihood of the monitor itself being bad? My company is fine with me spending some $ to get it back up and running, but I don't want to order parts and replace them only to find out that something else is bad and it's a total loss.

While I am pretty handy, I have virtually no knowledge of the inner workings of an arcade cabinet so don't assume I've done the obvious checks. For the same reason please use layman's terms for anything that isn't a fairly standard electronic part. Any guidance is greatly appreciated. THANKS!!!
 

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A friend of a friend recommended replacing the High Output Transistor. He said it would be a 3 pin transistor mounted on the heat sink. I see a few transistors on the neck board that meet that description. Should I just try to swap all of them? Does this sound like something worth trying in the first place? Is there anything else I should change while I'm in there? Does anybody have suggestions for where I can find a replacement? Again, any guidance is greatly appreciated.
 
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