Star Light (Williams, 1984): common faults and System 7 replacement boards

June 26, 2026

Does your Williams Star Light fail to boot, reset, see its flippers drop out or have no sound? These symptoms are typical of Williams System 7 pinball machines, whose original boards (MPU, Driver, power supply) are now over 40 years old. The good news: the WillFA7 replacement board, Plug & Play and battery-free, brings your machine back to life.

Star Light (Williams, 1984): overview

Released in 1984, Star Light is regarded as the last System 7 pinball machine from Williams, on a stellar theme with a playfield close to that of Laser Ball. Featuring 2-ball multiball, it is very rare with only about a hundred units produced.

Manufacturer: Williams
Year: 1984
Electronic system: Williams System 7
Type: solid-state pinball, 2-ball multiball
Theme: space / stars

WillFA7 MPU/Driver board for Williams System 3 to 7 — The WillFA7 board replaces the original MPU and Driver of Williams System 3 to 7.

Common faults (System 7)

On Williams System 3 to 7, the recurring faults come from ageing: leaking NiCad battery on the MPU (corrosion, the No. 1 cause of dead boards), worn 40-pin MPU↔Driver connector (the best-known weak point), resets/reboots on a 5 V drop (power headers and connectors to be resoldered), tired power-supply capacitors, displays with missing segments, and a solenoid fuse that blows (slingshot or stuck bumper).

Issues specific to Star Light (forum feedback)

Non-standard 'Blue Flipper' ROMs: because of the limited run, Star Light uses specific EPROMs; wrong ROMs prevent boot-up.
No boot or resets: corroded battery and worn 40-pin connector, typical of System 7.
2-ball multiball won't start: trough and lock switches to clean or replace.
No sound: System 7 sound board to be diagnosed (Sound Select signals on the MPU side).
Displays with missing segments: displays and power supply to rework.
Rare parts: only about a hundred units; keep and repair the original parts.

Checking voltages with a multimeter on a Williams System 7 — A multimeter is used to check the 5 V and diagnose the boards of Williams System 7 machines.

Replacement boards compatible with Star Light

WillFA7 — 2-in-1 board (MPU + Driver) compatible with System 3 to 7, System 7 included.

WillFA7 replacement board for Williams pinball — The WillFA7: Plug & Play installation, battery-free, with tutorials and free support.

📚 Further reading: Guide: which board for a Williams System 3 to 7?

The WillFA7 replaces the original MPU and Driver board (boot-up, logic resets, coil and multiball driving, battery-free memory) and removes the fragile 40-pin ribbon. Because of Star Light's specific ROMs, contact us to validate the configuration; the sound board must still be maintained separately.

Plug & Play installation, battery-free, free tutorials and support. Contact us.

FAQ — Star Light Williams

My Star Light won't boot, is it the ROMs?
Star Light uses specific EPROMs; first check the battery and 40-pin connector. The WillFA7 replaces the MPU and Driver and boots without a battery; contact us for the ROM configuration.

The multiball no longer starts.
Often dirty trough or lock switches. The WillFA7 makes coil and memory driving reliable.

Is the WillFA7 compatible with System 7?
Yes. It covers System 3 to 7, System 7 included, and drives the logic, multiball and coils.

Should I keep the original battery?
No. The WillFA7 works without a battery and removes the No. 1 cause of corrosion on System 7.

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: look for any battery or corrosion trace on your Star Light's MPU; remove the NiCad battery if it is still present.
Power supply: measure the 5 V and check it actually reaches the MPU and Driver (redo the power solder joints and connectors if the voltage drops); check the fuses.
Grounds and power connectors: resolder the tired headers between the boards to eliminate resets and reboots.
40-pin MPU↔Driver connector: re-pin the oxidised link with trifurcon pins, the No. 1 weak point of Williams System 7.
Displays: never plug or unplug a display while powered on; test with a known-good display.
Final test: check boot-up, credits, coils and displays; reminder: the WillFA7 replaces the MPU and Driver and boots without a battery. If needed, contact our free support.