The lamp driver board is only for the feature lamps.

There's an Aux. driver board under the playfield whose purpose is to flash the GI. It probably has cracked solder joints on the header pins and the vibration from the flippers are causing an intermittent connection.

Remove the board and reflow the headers. Do the same with the solenoid expander board while you're at it.

Cross reference the lamps with my Tech Chart and you will know where to look.
http://www.pinballrebel.com/pinball/cards/Tech_Charts/Bally_Centaur_Tech_Chart.pdf

Peter
www.inkochnito.nl

Also, check the GI connector on the transformer board.

Generally these are all toasted up, unless they have been replaced recently. They’ll run for a while, when they heat up they loose contact and the lights go out.

If so, you’ll need to replace the molex connector - cut the wires back a little so there is fresh wire to use - and probably the connector on the board as well.

rd

What AC voltages are you showing on the affected GI lamps across both wires - put volt meter on AC and put the red lead on one lamp connection and the black lead on the other.

Check for other connections where the GI daisy chains across the PF. For example, The orange GI wire also connects to the right flipper solenoid. It might be loose. I had a similar problem with my medusa.

The only choice is to sell it to me at a great loss.

It's likely either a connector or cold solder joint as stated above. When it goes out try wiggling some stuff

The aux lamp driver board is on the swing out display panel between the 1st and 3rd player score displays. Look for cracked solder joints around the male header pins.