Touchdown (Gottlieb, 1984): Troubleshooting and System 80A Replacement Boards
Your Touchdown by Gottlieb lamps flickering and clicking at power-on, high score not saved, is stuck in game over, or resets randomly? These symptoms are typical of Gottlieb System 80A pinball machines whose original boards are now over 40 years old. The good news: the GottFA80_Plus replacement board, Plug & Play and battery-free, brings your machine back to life.
Touchdown (Gottlieb, 1984): Overview
Released in 1984, Touchdown is a System 80A pinball machine with a sporty American football atmosphere and a dynamic playfield. It uses the Gottlieb System 80A electronics.
- Manufacturer: Gottlieb
- Year: 1984
- Electronic system: Gottlieb System 80A
- Type: solid state
- Theme: American football
Common Issues (System 80A)
All Gottlieb System 80A pinball machines share the same weaknesses as System 80, with added complexity from alphanumeric displays and speech synthesis:
- Leaking NiCad battery: soldered to the MPU board, it corrodes traces and components over time — the #1 cause of dead boards. Remove it immediately.
- Floating grounds: the original ground wiring is undersized and causes resets and erratic behavior. Ground mods are virtually mandatory.
- Edge connectors (the "Gottlieb plague"): oxidized edge connectors cause display faults, missing digits, and intermittent failures. Clean or replace them.
- Corroded connectors: Molex connectors, especially the MPU-to-driver connection, lose contact and require re-pinning.
- Drifting power supply: the 5V and 12V rails sag over time; trim pots and aging capacitors need attention.
- Sound board: leaking capacitors, cold solder joints, and failing ROMs cause weak or absent sound and speech.
Touchdown-Specific Issues (Forum Reports)
- Lamps flickering and clicking at power-on: all lamps (playfield and backglass) flash, flippers are dead; reseating edge connectors and ribbon cables on the power supply board (with game off) often fixes it.
- High score not saved: score is retained while the game is on but resets to zero at power-off; often a remote battery holder with a broken connection.
- Stuck in game over: game accepts credits and scores points without solenoids, but does not launch the ball — check the game-over relay (Q) under the playfield, its coil and diode.
- Random resets: floating grounds and oxidized connectors.
- Battery damage on CPU board: corrosion to neutralize immediately.
Compatible Replacement Boards for Touchdown
- GottFA80_Plus (Light) — all-in-one CPU + driver + power supply board, without sound.
- GottFA80_Plus (Full) — same all-in-one board with integrated sound.
- Gosof — replacement sound board for System 80 and 80A.
- Godri80 — replacement driver board.
- Lisy80 — CPU board + web-based diagnostics.
- GoPOP80 — pop bumper driver board (MA-922).
The GottFA80_Plus replaces the original CPU, driver, and power supply in a single board — battery-free, no corrosion risk. The Gosof replaces the sound board (System 80 and 80A, including speech synthesis). Installation is Plug & Play, with tutorials and free support. Contact us.
FAQ — Touchdown Gottlieb
All lamps flicker and click at power-on.
Reseat edge connectors and ribbon cables on the power supply board (with the game off). This is a power delivery issue.
High scores reset to zero when I turn the machine off.
The battery connection is broken (often a remote battery holder). Our replacement boards use NVRAM — no battery needed.
The game is stuck in game over and won't launch the ball.
Check the game-over relay (Q) under the playfield, its coil, and its diode.
Is the GottFA80_Plus compatible with my Gottlieb System 80A?
Yes. The GottFA80_Plus covers System 80, 80A, and 80B. If in doubt, contact us.
Do I need to keep the original battery?
No. Our boards run without a battery and eliminate the #1 cause of corrosion.
How long does installation take?
Installation is Plug & Play: just a few minutes, no soldering required, with tutorials and free support.
Does a battery-free board retain settings and high scores?
Yes. Modern replacement boards use NVRAM: no battery, no corrosion, and settings are preserved when powered off.
Step-by-Step Diagnostics
- With power off, visual inspection: look for any signs of battery leakage or corrosion on the MPU of your Touchdown; remove the NiCad battery if still present.
- Power supply: measure the 5V rail and verify it reaches the MPU (re-solder the voltage regulator or Q1 if voltage drops).
- Grounds: apply ground mods between the boards (CPU, driver, power supply, sound).
- Connectors: re-pin oxidized Molex connectors, especially the MPU-to-driver board connection.
- Displays: never connect or disconnect a display while powered on; test with a known good display.
- Final test: verify startup, credits, solenoids, and displays; if needed, contact free support.
Useful Guides
- How much does pinball machine repair cost? A price guide
- How much is my pinball machine worth? Value and estimation
- Pinball machine leg sizes: the complete guide
- Which board for a Gottlieb System 80, 80A or 80B?
See Also
- Jacks To Open (Gottlieb, 1984)
- Royal Flush Deluxe (Gottlieb, 1983)
- Rack 'Em Up (Gottlieb, 1983)
- Amazon Hunt (Gottlieb, 1983)
