Hello,
I have a Jetson Orin Nano 8GB developer kit. A jumper wire with a connection to the 3.3V pin on the 40pin expansion header briefly contacted 24V. To see whether it was still working, I supplied 10V at 2A through the barrel jack with a power supply and it does not turn on, but draws ~0.5A
The green LED lights up, but the fan does not spin. The 5V pins still output, but the 3.3V pin reads 0V. I don’t see any damage on the carrier or main board. The green LED did turn off briefly after being powered on for ~15s and the power draw drops to ~.25A when the LED is off. There is also only 1.6Ohms of resistance between the 3.3V and GND pins.
Could you please provide guidance on which components might have been damaged?
My carrier board is P3766.
Thank you for all your assistance, please let me know if I’m missing any useful information. I really hope that the board can be salvaged.
(Moved to Jetson Orin Nano forum)
P3766 is the part number for the overall Orin Nano Dev Kit. The carrier board for the kit is P3768 and the reference design files including schematics and assembly drawing are here: Jetson Orin Nano Developer Kit Carrier Board Reference Design Files. Use the Concept version pdf to see which components are stuffed/installed or not.
The 3.3V pin on the 40-pin expansion header comes directly from the system VDD_3V3_SYS rail that supplies the VDD_1V8 regulator and several components, so it’s a very bad sign that it reads 0V. The VDD_3V3_SYS regulator circuit is on page 10 of the schematics. The bulk cap on the regulator output is only rated for 6.3V and some of the others for 16V, so one or some of them may be damaged. The inductor (L45) from the regulator to the output caps and/or the regulator itself (U4) could be damaged. You could try removing L45 and then check the resistance to ground of the 3.3V pin on the 40-pin header. If it changes, the damage is in the inductor or the regulator itself. If it doesn’t change, finding the damage causing the low resistance is much more difficult since the net goes to several places.
For reference, my Orin Nano Dev Kit has ~2.65kohm from pin 1 3.3V to pin 39 GND on the 40-pin header.
Thank you for moving the topic to the correct forum.
If the carrier board is damaged, is there a way to determine whether the Jetson is still functional? I think it would make more sense to purchase a new carrier board instead of trying to repair at this point.
Unfortunately there is no realistic way to check the Jetson module’s functionality without a working carrier board.
NVIDIA does not separately sell the carrier boards for any Jetson modules, but several partners sell carriers designed for Orin Nano: https://marketplace.nvidia.com/en-us/enterprise/robotics-edge/?category=hardware&hardware_solution=carrier_board&supported_jetson_products=Orin+Nano&page=1&limit=15