I was doing my initial testing of the stepper motors. The z motor worked well, but I only had 1 motor on x and 1 on y working. I powered off the board and switched two of the motor leads to see if it was a motor issue or the board. It booted up fine, so I switched from access point to STA, and went to reboot. The A (x1) and B (y1) terminals for the motors were still not working. I shot down the board and switch the terminals back to the original position. However, the board never came back online after I plugged it in. Then, there was a pop and some smoke near the power LED. I quickly unplugged the unit. Not sure what was wrong, but I think maybe it was defective or got damaged during shipping.
Hello, Simon. Welcome to the V1 community forums.
Do you Have hig-resolution pictures of the as-wired Jackpot? That’s a very unusual failure mode.
Hopefully @vicious1 will have take a look at this thread tomorrow morning during business hours in California.
2 Likes
Thanks for the speedy reply! I’ll try to get some photos of the configuration tomorrow
2 Likes
The boards are fully powered up with 24V before shipping.
We need to see clear well lit pictures of the top and bottom of the board please. If you have one with it still wired up that would be good to see.
2 Likes
Here are photos of how it was set up when the issue occurred. I tried to follow the wiring instructions carefully, but I wasn’t able to get terminals A and B to work with any of the combinations I tried. That is, I was only able to see one x motor and one y motor working before the board went out
What power supply are you using?
Those green barrel jack connectors are notoriously bad. So bad my power supplies came with them and I had unpack and open ever single one to take them out. Then repack them.
That would not cause this situation, though, that would be intermittent power. Unless it is supper loose and pulsing the power supply on and off.
That is a popped 3.3v regulator.
Unsure how that could happen after my full power testing. You will need to send it in for a repair and testing.
1 Like
Have you plugged in a pendant, ever?
Jim, any ideas how that could happen. The most direct 3.3v connection is the micro-sd port, maybe shorted there with a bad card? The inputs are protected, drivers would pop before feeding back on the 3.3 right?, pendant is protected…
Can something draw too much power.
Simon, did you plug anything into the expansion module port, ever?
Simon, did you flash this for MPCNC use? Since I do not sell MPCNC kits right now, I only flash the boards with LowRider firmware unless specifically asked otherwise.
That would explain the steppers not moving as expected, not the 3.3V thing.
Not sure what a pendant is, so I don’t think I plugged one in, just the motors and the end stop switches. I also didn’t have an SD card plugged in.
Oh, ok, I thought the terminals not working would be a software issue. That makes sense if the firmware was configured for lowrider
I’m re-reading the thread. We covered most of the ways boards get blown up thread. Blown TMC2209s from unpowered motion used to cascade destroy the 3v3 and 5V regulators on the SKR boards.
But there’s no mention of moving the machine around by hand while unpowered in this thread so far.
I don’t think we’ve seen a blown stepper driver or regulator on the JP3 since release. There are a lot of improvements on JP3.
2 Likes
This is the PSU, from the MPCNC components amazon link