Wrong connection of 3dtouch in duet maestro

[RodrigoRMaraujo]

Hello everyone.
I connected a 3dtouch probe (trianglabs) to a Chinese Duet Maestro board by mistake. Now the power supply via the USB cable is getting so hot that the USB connector is burning my fingers. Connecting it to a 24V power supply makes one of the LEDs light up, but the board does not connect to the local network.
Did I permanently burn the board or is there something I can still do?
Thanks to anyone who can help.
(sorry for the Google translate, I'm in Brazil)

[droftarts]

@RodrigoRMaraujo Unfortunately, that sounds pretty terminal. Not sure what will have failed, but most likely it's shorted out the MCU (main processor). When plugged in, check if the MCU or SD card socket get hot. You could try checking this page: https://docs.duet3d.com/User_manual/Troubleshooting/Duet_wont_respond
Note that the LEDs on your board are probably all green (keeps the cost down on Chinese clone boards), but they should be in the same order.

Ian

[RodrigoRMaraujo]

@droftarts
I read the content of the link you sent, thank you.
Yes, it gets a little hot under the main processor, but you can keep your finger on the board. However, it is not possible to touch the USB and SD card connectors, as they get very hot in just a few seconds!

It really seems like I joined the list of people who managed to burn a Duet, lol.
I have already ordered a new board.
Thank you very much for your reply.

[dc42]

@RodrigoRMaraujo on the Maesto the components most likely to fail when they are subjected to excessive voltage are the SD card and the W5500 Ethernet chip. So remove the SD card, then power up from USB again and see whether anything is still getting hot.

[RodrigoRMaraujo]

@dc42 thanks for replying.
I removed the sd card and the connector still gets very hot, and very fast. I can't even keep your finger touching the USB connector.