Freedom (Bally, 1976): faults and replacement boards (Bally MPU)
Your Freedom by Bally (solid-state version) no longer starts, has dark displays, runaway coils or targets that no longer reset? These symptoms are typical of Bally microprocessor pinball machines, whose original MPU board is now over 40 years old and almost always suffers from a leaking battery. Good news: the BallyFA replacement MPU board, Plug & Play and battery-free, gives your machine a second life.
Freedom (Bally, 1976): overview
Released in 1976 on an American Bicentennial theme (the Statue of Liberty), Freedom was produced in an electromechanical version but also in a solid-state version (microprocessor-based), which marked Bally's transition to electronics. This article covers the solid-state version.
- Manufacturer: Bally
- Year: 1976
- Electronic system: Bally MPU (solid state)
- Type: electronic pinball (solid state)
- Theme: American Bicentennial / freedom
Common faults (Bally / Stern)
On microprocessor Bally and Stern machines (1977-1985), recurring faults come from ageing: leaking battery on the MPU (corrosion of traces and sockets around U10/U11, the No. 1 cause of dead boards), tired PIA 6821 (U10/U11) (oxidised pins, impossible start-up), 5101 RAM and sockets to replace, MPU/power connectors oxidised or burnt (look for heat marks), displays with missing segments, and power/driver board (rectifier, fuses, coil transistors) to service.
Problems specific to Freedom (forum feedback)
- Drop targets that don't reset: often the outhole switch no longer registering; as long as it doesn't close, the targets don't reset.
- Erratic spinner counting: spinner switch to clean or adjust.
- Leaking battery on the MPU: corrosion around U10/U11, the No. 1 cause of dead boards.
- Dark or partial displays: display and MPU power supply to check.
- Oxidised connectors: to replace for a more reliable machine.
- Main fuse blowing: look for a shorted coil or rectifier.
Replacement boards compatible with Freedom
- BallyFA — replacement MPU board (battery-free).
- BallyDri — power supply + driver.
- BallyLa_60 — lamp driver.
📚 To go further: Guide: which MPU board for a Bally / Stern (1977-1985)?
The BallyFA replaces the original MPU board (start-up, logic, battery-free memory) and removes the battery, the No. 1 cause of corrosion. The power/driver board (BallyDri) and the lamp driver (BallyLa_60) complete the restoration if needed. Plug & Play installation, battery-free, free support. Contact us.
FAQ — Freedom Bally
My Freedom no longer starts, where do I begin?
Check the battery and corrosion around U10/U11. The BallyFA replaces the MPU and works without a battery.
My targets no longer reset.
Often the outhole switch; once the mechanics are checked, the BallyFA makes the logic and coil control reliable.
Is the BallyFA compatible with my Bally?
Yes, for microprocessor Bally/Stern machines (1977-1985). If in doubt, contact us.
Should I keep the original battery?
No. The BallyFA works without a battery and removes the No. 1 cause of corrosion.
How long does it take to install a replacement board?
Installation is Plug & Play: a few minutes, no soldering, with tutorials and free support.
Does a battery-free board keep the settings and high scores?
Yes. Modern replacement boards use non-volatile memory: no more battery, no more corrosion, and the settings are kept when powered off.
Step-by-step diagnosis
- Powered off, visual inspection: spot any trace of battery or corrosion on your Freedom's MPU, especially around U10/U11; remove the battery if still present.
- Power supply: measure the 5 V and check that it reaches the MPU (service the power/rectifier board and the fuses if the voltage drops).
- Grounds and connectors: rework the oxidised or burnt (heat marks) MPU/power connectors between the boards.
- MPU components: check the PIA 6821 (U10/U11) and the 5101 RAM, often tired or corroded by the battery.
- Displays: never plug or unplug a display while powered on; test with a known-good display.
- Final test: check start-up, credits, coils and displays; reminder: the BallyFA replaces the MPU and starts without a battery. If needed, contact our free support.
Useful guides
- How much does pinball repair cost? The price guide
- How much is my pinball worth? Value and estimate
- Pinball leg sizes: the guide by machine
- Which MPU board for a Bally / Stern?
See also
- Night Rider (Bally, 1977)
- Evel Knievel (Bally, 1977)
- Eight Ball (Bally, 1977)
- Mata Hari (Bally, 1978)
