The VDDM of the nRF54L15DK is only 1.74V, and the computer cannot recognize the J-Link.

[Leo Mo]

How can we solve this problem?

[Leo Mo]

New content.

[PaKa]

Can you deliver a picture of your board with the cables connected? Have you made any alterations to the board? Removed any jumpers? Cut/closed any solder bridges?

[Leo Mo]

PaKa 

Hi PaKa,

The red, green, and blue wires are used to measure the SPI signal.

It should be that I connected the wrong power supply, which caused the components to be damaged?

Now the computer has difficulty recognizing the J-Link.

[PaKa]

If you have connected power outside what is specified in the DK HW user guide then indeed you may have damaged the board. Before determining that I would check with multiple different USB cables on different PCs to make sure that is not the issue.

There is a LED close to the debugger, LD1, what is this doing when you plug in the DK?

If it blinks rapidly then you have a problem with the USB cable or the connection to the PC. If it blinks and then goes stable on then they USB is working and then it could be an issue with the drivers on the PC. If it doesn't light up at all then you are more likely to have fried the kit.

[Leo Mo]

LD1 did not light up, but the other 54L15DK is functioning normally, so the computer is working fine.

When I connect VDDIO to 3V, LD1 will flash a few times and then go out, sometimes it will continue to flash, and the computer can recognize the J-Link.

[PaKa]

Applying voltage on random pins on the board is a sure way to burn it so I would not be surprised if this has been damaged if that is what you have been doing.

Default voltage on the board is 1.8V so seeing 1.74 is inside expectation. Applying 3V from the outside when the board is set up for 1.8V is not OK.

[Leo Mo]

Yes, so I try to find out the broken components and replace them.