Jackpot2 board will not power on

Mostly Printed CNC - MPCNC Troubleshooting
1

Hi all,

Almost done with my MPCNC Primo build and having a blast. Unfortunately, hitting some issues with the board, and was sent this way when I reached out via email.

I’m using directly purchased / recommended parts wherever possible - nothing custom. Specifically, the Kastar PSU from Amazon and a Jackpot2 purchased directly from the v1e store.

Nothing to indicate it’s powered on when powered via PSU - no LEDs, wifi, etc. I connected it to my PC via USBC and get a green LED.

I’m newer to electronics, but using a multimeter and ChatGPT I compiled the following measurements:

  • PSU reads ~12V from the barrel

  • PSU reads ~12V from the wire adapter with nothing connected

  • Wires read ~12V when connected to the PSU (via adapter) but not the board

  • When wired to the board, terminals read ~1.4V. This is with nothing else connected but power.

  • I’ve also tried with the Nema steppers attached, but saw effectively no power then as well.

I’ve rewired a few times (swapping out the wires for new ones, reseating the connections, etc.) with the same results.

ChatGPT had me walk through a handful of measurements to find potential shorts, and it didn’t find any. However, well aware that I’m out over my skis here - and I know better than to assume its approach was the right one.

Any idea what I should do next? Happy to pull additional measurements and report back if that would help diagnose this.

Thanks in advance!

Zack

2

Very stupid question: Did you make sure not to switch the cables?

3

Do you have another power supply to test?

Any particular reason you chose a 12V PS not a 24V?

If you are trying to use the green terminal adapter thing you should throw it away and cut the plug off.

4

Thanks. I’ve been using that adapter but will try cutting the plug and going that way.

I got the 12V because that’s what’s linked. Figured I’d build exactly to spec using parts known to work, and make changes later if needed.

5

Alright, cut the cable and still seeing the same results without the adapter. Also tried swapping the cables (though I’ve checked this consistently) and that didn’t resolve things.

6

Can you upload a picture of it wired up please.

1 Like
7

Then upload some pictures please of how you connected it. :slightly_smiling_face:

8

Woof. Grabbed my wife’s laptop charger and swapped out the PSU. Lit right up and I’ve got the FluidNC signal now. Thanks for all the quick support - much appreciated!

1 Like
9

Hope you didn’t cut the cables… :sweat_smile:

2 Likes
10

Interesting, that is not very common.

With those adapters I have seen bad adapters, and I got a whole batch that had loose power cables, gave them a little bend and they worked fine after that.

11

I actually used the adapter piece in testing so as not to cut my wife’s laptop charger, so no issues there. For what it’s worth, there’s also a large capacity difference between the two PSUs.

1 Like
12

The Jackpot amp draw is tiny, that is not the issue for sure.

1 Like
13

If you order another power supply, I’d get a 24v like the one on the V1 store.

2 Likes