@jay_s_uk , Thank you for your reply, this area of ​​electronics is not my specialty at all. So, do you think there is a solution for troubleshooting or repairing it or more simply, I could no longer operate it?

@dc42 and @jay_s_uk ,Thank you for your feedback.

I looked closely with a magnifying glass and didn't see anything abnormal (swollen components or brown traces). I also connected the device with no load (still only the red LED ON), and nothing was heating up. However, I saw a temperature of around 40°C on the right side of SPI_DB and a small U10 component with an IR thermometer.

Do you have any other ideas?

Also, after the weekend break, when I reconnected the USB, the LEDs lit up steadily for 2 seconds, then only the red one remained ON.

@dc42 , thanks you very much.
I followed the procedure as indicated in your link, and nothing changed. My symptom with the Duet 3 mini 5+ board is this: it was working fine with 4 motors when suddenly, everything stopped. When I reconnect the USB cable, only the 5V LED works, but the others are off, especially the 3.3V one.

Do you have any ideas?

Thanks in advance.
Alban

Hello, I need to reboot the Duet 3 mini 5+ card using the "erase pins" procedure. My problem is that I can't find them, neither on the front nor on the back. And even with the card's documentation, I can't find it.