@wyvern said in How did I break the 5V rail?:
Did you by chance hook up the stepper with the duet powered on?
I didn't (un)plug any steppers, I'm aware of the fact that steppers shouldn't be hot-swapped.
@dc42 said in How did I break the 5V rail?:
I suggest you check the resistance of L3 using a multimeter. It should be lower than your multimeter can measure (0.04 ohms according to the datasheet). If it reads open circuit, than it has failed.
Lol how on earth didn't I think of this right away. It has been a long day for me.
It reads 1120k ohms, but when I reverse the polarity of the multimeter leads it somehow reads out of range (>2000k ohm). I don't know why this gives me a different reading but it's definitely dead. I'll order the inductor and bridge the pads in the meantime. Or I might use one of those tiny MP1584 boards that I must have laying around somewhere, they always come in handy.
I still wonder what happened. It could have been something simple like a bad inductor. Thanks to both of you. Especially to you dc42. I'm new to the 3D printing scene and I really enjoy working with the Duet WiFi.
