Low voltage lightning bolt

[bravebluerx]

Hi all,

Running arpicade with pi3b in my nintendo cab with oem nintendo power supply. Looks like my 5v may be weak as the lightning bolt appears during loading and gameplay.

Is it possible to run a separate external power supply directly to the pi while it still being connected to Jamma or would I have to disconnect the power lines into the pi gpio if I ran the separate power supply?

Thanks

[dee2eR]

You do not want to use 2 seperate power supplies together. It's possible nothing bad would happen but it is also possible they wouldn't get along.

Do Nintendo power supplies have a 5v adjust? Dedicated Nintendo cabs are not particularly common here, I'm much more familiar with regular switching power supplies that tend to be in JAMMA cabs.

If you're using a converter from whatever original Nintendo wiring to JAMMA is there adequate wire on the 5v and ground lines of the converter that it wouldn't be causing any excess voltage drop?

Would you be happy using a regular switching power supply (assuming there's no adjust on the Nintendo one), rather than the cabs original supply? That's the way I'd go if the one in there isn't doing the job (while keeping all original parts so it can be put back together if you like).

[bravebluerx]

Thanks for the reply dee2er! Nintendo cabs don't have an adjustable 5v off the power supply and my vector labs adaptors don't either. Looks like I will have to install the switching power supply or perhaps recap the oem one.

[cathaldub]

You can just disable the lightning bolt in the config, that’s what I done because i like to keep my 5v a little low as sometimes it creeps up and I run a jamma switcher and don’t want to blow an expensive pcb.
It’s never caused me any issues

Just add the following to your config.txt

Code: Select all

# remove lightning bolt warning
avoid_warnings=1

[bravebluerx]

Thanks for the reply, that's the route I have taken in the config.txt without any issues. Even My bench test pi 3b system hooked up to an lcd with pi recommended 2.5A power supply shows flashes of the lightning bolt as well upon arpicade boot up, so go figure. Never had any issues with game performance with lightning bolt flashing.

I did read in one of dee2ers posts that if you have an abundance of usb connected devices on the pi, you can swap out a 1 amp fuse on the earlier raspberryjamma boards to a 2 amp fuse to remove the bottleneck on the raspberryjamma to potentially avoid the lightning bolt or look at reducing usb pi connected devices completely.