Check your voltage....maybe you have put a 6.3V Bulb in a 12V line?.....

Mr and Mrs pac is going to have one of the transformer assemblies that likely puts out high voltage. My Black Pyramid is the same way and certain LEDs would smoke / overheat because of it. I can't say for sure that is what is going on tho for you.

Check the voltage to ground of the feature lamps. Even after changing the transformer tap black pyramid was like 7.5vdc... it was just how the transformer was. I did a hack and sent the 7.5vdc through another rectifier just to get the voltage drop of a couple diodes. Clamped a 35a bridge to do so on the metal frame where the transformer is to heat sink. It doesnt really get warm tho with LEDs.

I learned that hack from seeing it on bunch of those rectifier boards that i would buy in bulk lots.

Put a meter on the socket and see what it is.

LTG : )

That is correct. Schematic shows coin door should be 5.9 VAC. Take a meter and measure. Be aware that GI illumination is not regulated, so it can subject the LEDs to large spikes at power on, which probably smoked a component in your LED.

There isn't any single how to guide for LEDs because there are so many different LED technologies and so many different games. These games just weren't designed to have these sensitive solid state devices installed in place of filament bulbs.

Read my post again. The bally games like Mr and Mrs Pac have transformers in them that put out high voltage.

Old Bally transformers (like Mata Hari, Silverball mania) usually see like 5.5vdc or feature lamps and 6vac for GI. The cabinet transformer on later bally games(like MR/s Pac) is a lot beefier and the windings put out higher voltage. Sometimes it is way higher like up to 7-8v

Because the current limiting resistor (value picked to achieve MAX BRIGHTNESS) is chosen for 6v instead of 8v, it goes over current and burns making that nice stink.

Test the voltages in your game. I am thinking you are going to find them very high and that is why the LED smoked.

Of course, your voltage could be fine, and you could have have had a bad bulb, but likely, because you had issues getting them to fit, you might have had an issue there....another thought

People who work on a lot of Bally games has probably seen this. They have probably also gotten these cabinet rectifier bally games where nearly every single bulb is burned out. It kinda follow every -54 rectifier / transformer setup but some games are worse. Check out this Black Pyramid. 7.8VDC on the feature lamps which will smoke certain LEDs for sure. Over voltage will dim them out faster too.

The Operator cut the feature lamp track on the rectifier board. Sent it through a couple diodes to get a voltage drop down to around 6vdc and he no longer had to replace feature lamps as often.

3 (resized).jpg
4 (resized).jpg
before extra v drop
after extra v drop

The hack works as intended but I am not necessarily recommending it. Do at your own risk. Just trying to show why these Bally games DIM out and smoke LEDs faster than others. I am surprised this conversation does not come up more.

The issue shows up in GI too. Operator hack there is to rectify the GI to DC voltage which gives you some voltage drop across diodes.

The one in the picture is pretty good starter meter.

Mastech MS8268
https://www.amazon.com/Mastech-MS8268-Digital-Manual-Multimeter/dp/B07BZCL3PM/ref=sr_1_2