nrf5340 DK jlink not found

[allenboon]

Hello team,

I have used nrf5340 DK for some while. 

Today, I use DK board SWDIO & SWDCLK to flash my PCBA. But, suddendly my PC cannot found DK.

When DK connected to PC, device mananger was no response. Virtual seriort port and jlink both cannot enumerate. The LED5 also no lighting as below picture

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I have measure DK power output, VDD and 5V both work normally.

This issue have occured on my two nrf5340 boards.

Can anyone help to solved this issue? Thanks.

Allen

[Menon]

Hello,

Thank you for checking and clarifying the issue.

Today, I use DK board SWDIO & SWDCLK to flash my PCBA. But, suddendly my PC cannot found DK.

I assume you are programming a custom board  via SWD interface. Does your DK get unrecognized after flashing?  How are you powering the custom board? I guess you connected the VDD/GND/SWDIO/SWDCLK properly.

Kind Regards,

Abhijith

[allenboon]

Hello,

Yes, I connected VDD/GND/SWDIO/SWDCLK to our custom board. I think maybe Jlink hardware have broken, because the nrf5340 side function normally(I can see LED on). But, I do not know why Jlink hardware broken.