I'm trying to replace four incandescent flashers on my Gottlieb Genesis with SMD variants, but they aren't working. These are the four lamps under the ramps.

• If I replace these ramp incandescents with new #67 incandescents, the new #67 bulbs don't light.
• If I swap in a comet pinball 12v 5smd flasher, it doesn't light.
• If I swap in a comet pinball (?)v 8smd flasher, it doesn't light.

However, there is another section of incandescent flasher bulbs (marked as the "playboard"), which gives me different results.

• A new #67 incandescent works.
  An original incandescent from one of the ramps doesn't work.
• If I swap in a comet pinball 12v 5smd flasher, it lights.
• If I swap in a comet pinball (?)v 8smd flasher, it doesn't light.

On the diagram, the ramp lamps and the playboard lamps are both #67 bulbs and are both fed from the same +24v line from the transformer and pass through 4ohm 7W resistors before reaching the lamps.

At this point, I'm a bit puzzled about what the dependency is between the ramp lamps and the playboard lamps. Any ideas? Thanks

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Hmm...now the original flasher bulbs for the ramps aren't working at all.

The voltage does change when the lamps are supposed to flash, but I don't seem to be able to get an accurate reading since they only flash quickly. It looks like it maxes out at 8v if I use a multimeter on the lamp socket and lamp button.

Nevermind, I figured it out. I backedtraced the issue to a connector on the driver board which wasn't pushed down all the way.

Yeah, having them on the same circuit as the solenoids confused me a little bit, and I didn't think to check the diagram and connector on the driver board that was controlling them.

Both the 5 and 8 smd flashers worked. However, using the 5smd without a lens/dome on them to diffuse the light, I see several distinct points of light for each individual flasher, which doesn't look right to me. So, I'll probably swap them back to incandescents. The 8smd flashers have a ring that is too large to fit through the holes on the playfield.