After running for a couple of hours the game locks up mid-game and shows a U25 error.
Game freezes after a few hours with a U25 error
Cause: A surface-mount chip whose solder joints have loosened with age and vibration.
Checks
- Find the part at location U25 and inspect its pins under magnification for cracked or lifted joints.
- Note whether the fault follows warm-up; heat-related freezes point to a marginal joint.
Fix
- Reflow the pins of the surface-mount part at U25, then check neighbouring pins for bridges.
Systems
Source: Capcom Pinball Problems/Solutions