Resistors. Buy non ghosting bulbs and see if it changes anything. Not sure why you would be getting ghosting in blackout. I just did one and used comet bulbs and all was well. No issues.

Then keep trying to put your own resistor on the socket. Not sure where it would go. I just buy non ghosting bulbs. Good luck!

Would adding a resistor in series with the LED instead of in parallel work, or help? I thought that adding a resistor across the bulb lugs as you are trying was a Bally/Stern thing, not for a Williams with a lamp matrix. Which seems to be the case if you are doing it and the ghosting gets even worse.

A resistor.

Not sure. But says so right on the comet website it has a resistor.

I always use non-ghosting in Williams machines. Also with Data East. It's worth the extra few cents per bulb to easily eliminate the ghosting

Are all of your bad ghosting lamps on the same row or same column of the lamp matrix? I mean if it's only certain lamps and the rest are fine it's possible you have another problem besides the LEDs themselves.

Blinking is not ghosting. Ghosting is the lamp always being on slightly even when it’s supposed to be off.

What is happening during that video? Is it attract mode, during the game or what?

I have leds in my Black Knight's double and triple score inserts, one stays slightly on, other blinks. I consider both 'ghosting' really. Seems to change depending on other lamps that are lit or flashing. But they are green leds and the inserts are dark and the lighting up is so slight you don't notice it unless you look right down into them. They are cheapie leds as well so non-ghosting ones would probably make it go away.

Yeah I guess you’re right. On my EMs they do nothing until a coil fires and that’s ghosting for sure.

After watching the video, those are definitely ghosting. I was thinking more of the strobing you see in Ballys with LEDs that aren’t modded.

When those two LEDs are blinking, are there any other LEDs on the same row or same column that are flashing?

Yeah. In that video you posted. Show the rest of the playfield.

What was the end result on this? I had no "Ghost Blinking" leds before I did a hardtop replacement on my Firepower but now I have multiple inserts doing the exact same thing and they seem to change depending on what other insert is lit. I'm thinking a bad diode somewhere.....

I concur.

Just "better"...?
not... "Changed all the [LEDs to non-ghosting LEDs] and now it's perfect! Definitely!"..?

I (also) have a Black Knight. The previous owner re-lamped the thing with cheap LEDs. The display is a mess... ghosting, random brightness, intermittent blinking in attract mode and game play, bleh. I need to hook up a lamp matrix test board widget one of these days to confirm the problem isn't on the driver board. But I suspect the display issues are the product of hack LED conversion.

These games were never intended to be used with LEDs.

Thus a perfect solution with a different technology is probably a bit much to ask for.

I strongly consider just leaving bulbs in these games.

I buy the non-ghosting premium LED's from Cointaker, and they get rid of a lot of the disappointment I feel when a game made for light bulbs has inappropriate 'glitchy' lighting due to LED lamps. They help, but frequently you'll get some inappropriate light flickering.

(shrugs) Some things you just live with.