LED circuit board makes a good replacement to a grid of lights like this. Nice.

Can the bare bus wires short against the PCB or do you plan on a stand off? Maybe put the current limiting resistors on the same side with the LED bead (PCB assembly house probably like that too).

Baby Pac uses the multi phase AC feature lamps and normally a diode is used so one SCR can light two lamps, one in each phase. The LED will reverse block too, but normally only rated at like 5v and the feature lamp will swing to 6v. You probably want to add the 1n4007 diodes.

I'm not sure if you were aware of not, but later versions of baby pacman playfields had twist socket lamp boards

https://www.pinwiki.com/wiki/index.php/Baby_Pac-Man#Playfield

The wiring on the lamp board playfield is different.

I have a baby pac with lamp sockets like yours. I picked up a complete playfield with the lamp board with the thought that I could just swap the playfields, but the connectors that mate with the cabinet hardness don't match. They did something different with it, though I haven't taken the time to map out the wiring yet.

Probably going to need capacitors to help prevent flickering too since the LEDs will only get half wave DC yeah?

They are going to have a 60hz strobe to them. I've tried LEDs in a 6803 game and it wasn't that noticeable under inserts.

A friend had pretty bad luck with LEDs in a 6803 to the point some LEDs flickered so bad they didn't even switch on sometimes. But we hadn't got into adding load resistors, even then I was skeptical with the half wave.

However I have read here some have had good results with LEDs though.

Hopefully @kuhurdler's board works fine.

There are at least two different operating systems for 6803 that behave differently with LEDs. The one used in special force works okay with LEDs. Eight ball champ was really bad.

Excellent!

Not sure if this has any bearing, but because Baby Pac-Man and Granny and the Gators used the special combo solenoid/driver board, supposedly that allows them to handle LEDs perfectly fine. Mine has all LEDs and it looks great.

This is wonderful, because those sockets suck and they are insanely easy to short out, accidentally.

I would suspect it more likely a software thing.

These bally-stern games would work fine with LEDs if the software updated the lamps further away from the zero cross. Bally's original good idea was to turn the lamps on as close to zero volts as possible to not stress the incandescent filaments. 30 some years later it ends up being an issue with LEDs not drawing enough current.

That is why you don't need to have the extra load resistors for the aux lamp boards. They turn on those lamps after the main lamp driver board which is far enough from the zero cross point the SCRs latch fine.

The Bally-133 dual-phase games likely refresh the lamps further from zero crossing since the rise/fall time of the feature lamp voltage is slower than the other typical games based on steeper solenoid zero crossing voltage. The below diagram is probably how it works based on the software code in Goldball (another dual-phase feature lamp game).

The result with LEDs will be the 60Hz strobing as you mentioned since there's no voltage at the feature lamps just over 50% of the time because of the half wave rectification.

Dual-Phase_Zero_Crossing.png

Thoughts on Price ??

I’d be interested so have as a backup

If you are seeking a Beta Test

Lmk

Wow, that’s a lot of soldering!
Good luck!
Show us the top of the playfield, how does it look?

This is awesome!

Really looks nice. And even though video is never like seeing it in person, it totally looks all incandescent and evenly lit across all the lights on the game.

For those who don't know, BPM is an awesome game. So much fun. Everyone loves playing it when they come here. I just wish I had it up and running now. I have some issues I have to figure out and fix on her.

If you ever do decide to produce a bunch of these for sale, I'd be in on one. My BPM will never leave my home.

Here's a pic of mine that I did completely over. As you can see, the video isn't rendering. Sigh.

20230101_175814 (resized).jpg

Need LED boards to replace the other inserts on the playfield as well.

Time to get creative with the board layouts.

It's fantastic. A grid of lights like this can be replaced with an LED circuit board. Can the bare bus wires short against the PCB? I put the current limiting resistors on the same side as the LED bead in my project. This was revealed to me while participating in a PCB assembly session. You can also use it as a reference.

I agree it looks awesome and is a great idea. Just need to figure out a way to tidy up the wiring and put it on plugs so it can be removed if needed.

I can't tell if you are doing this already from the pic but another to consider is to draw a tracks on the PCB to reduce the wire count that needs soldered to the PCB. Ie if a brown white wire drives two different lamps at opposite phase, then a track on the pcb could replace the redundant 2nd drive short wire loop. Solder at the point the two wires come together at then you should be able to remove the small wire loop making the install quicker.

I would hope that anyone who is going to go through the trouble to remove all of the sockets is capable of crimping a few molex pins. Hard to say though.

watching this thread with much interest!

Brian

Add the 1n4004 diodes too, your LEDs will be less stressed out reverse blocking at the top end of their limit.

connectors are good for the games that have it. Asking someone to build a connector that doesn't have one is a lot of work. Maybe something like this is a compromise for the no board games if you looking for solderless install.

pasted_image (resized).png

Looking sweet!

Looks good!

So clean! Amazing job!

I wish Alltek or someone would come up with an updated version of the Vidiot board. Man, that would change the whole game for the better. Buy both their boards along with Kuhurdler's light board and we'd all have new machines with no reliability issues.

PLEASE let someone redo the Vidiot board.

I would be interested, the original setup is too much of a pain. ( If not 1 million $ )

I like crimped Molex connectors. I hate those green terminal blocks

Awesome!

I have a later production Baby Pac with the factory PCB light board. Is this plug and play with that version?

Thanks!

I'll buy your stock light pcb if you decide to go for the new replacement.

Ordered through your website, somewhat surprised that no shipping cost were added for a shipment to France ( Paris ), If you need extra money contact me.