Repairing an acid-damaged Stern MPU-100, Bally 35 board - PinballHelp.com

Batteries were soldered onto the circuit board and over time will begin to leak and damage the game with acidic electrolyte. I go over how to clean and repair the board so it will work again. (part 1)

[@Riz2336]

That sucks the pinball companies didn't know any better back in the day when they were making these boards