Problem with the barrel Jacket

Hello, I was using my Jetson Nano with the DC Barrel jack. The Power is gived by 7.4 Lipo Batery and then I used a 5V step down.
But I connected the wires with inverse polarity and now my Jetson Nano can’t turn on with the barrel jacket.
It works with the Micro-USB and with the headers when I used the same circuit (Step Down and battery).
What can I do?

If you have good hardware knowledge, you can do some checking to find out which components might be damaged by your operation. Otherwise you can try RMA for it.

Where do I have to check in the PCB?

You can check the ESD, load switch and etc. based on the schematic and assembly file of PCB in the design package.

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