We still have 3 kids living with us. I got the game going at around 4:30PM. They've been playing it non stop for 5 hours 
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I'm guessing I should get busy and buy an updated PS for it? I dont need any surprises.
I did a brief check and it doesn't look like TNT ground mod was done yet, so I'll need to dive into that.
I'm going to have to respectfully disagree. The consensus of doing the grounding mod is to correct some bad engineering on these boards. Yes, you should make sure the edge connectors are clean. But, part of the problem is that there is only one ground connection between the cabinet ground and power supply. If there is any resistance on that, it may cause the voltages to drift. If the voltage drift, gets high enough, the solenoid drivers can start to conduct and lock the playfield coils and burn them up pretty quick.I'm gonna swim against the tide here and say that the ground mods that many experienced people consider to be "necessary" for these games are... not really necessary.
With all of the System 80 games, my approach is to get all of the card edge connectors clean and shiny (very fine emery cloth or sandpaper works well), treat each connector with contact cleaner, and then reseat each connector a few times. For added peace of mind, I then ohm out the ground and power circuits from board to board.
Nothing wrong with doing the ground mods recommended by various sources... but I feel the need for them is overstated. In any case, solving issues with the original connections should be your starting point.
Enjoy your game!
If I remember correctly. The ground goes from the power supply through a connector to the MPU board, on only 2 wires to a single sided edge connector. Through the MPU board to another connector to the driver board, through the driver board to yet another edge connector and on to the sound board (and maybe another? Depending on game) Either way, having the ground daisy chained this way is just asking for trouble down the road.



