Can't connect to nRF5340DK from nRF Connect for Desktop

[submargin]

I've just got a new nRF5340DK (PCA10095, 2.0.1, 2023.3, 1050075869).

Unfortunately I am not able to connect to it / program it. I use the latest versions of nRF Connect for Desktop and nRF Command Line Tools (just reinstalled them).

Symptoms:

1) When moving power switch to the ON position, LEDs 1-4 start turning on and off (kind of linear motion effect). From https://www.nordicsemi.com/start5340dk it seems that there should be only one LED on? Maybe those new DKs come with a new firmware by default?

2) nRF Connect for Desktop doesn't see the DK (neither `nrfjprog -i`).

3) When I connect the other DKs (nr52832DK, nrf52840DK) - explorer window with a fake JLINK drive pops up. Nothing like that happens when the new 5340DK is connected.

I've tried bunch of USB cables and ports, didn't help (also same cables and ports work fine with my older DKs - nRF Connect can see them, etc).

[Menon]

Hello

 Could you check which position every switch on your DK is put to? There should be 3 switches, the power switch, nRF power source switch and nrf only|default switch

The switches should be set to on, VDD and default respectively.

Which micro-usb port have you connected your device to? Is it the nRF USB port on the long side or the USB port on the short side?

What is the status of LED5 on your DK?

Have you measured the supply voltage on the kit? It should be somewhere between 2.8V-3.3V. If it isn't, then the hardware is probably broken.

Kind regards,

Abhijith

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Positions of those switches are correct (on, VDD, default).

I am using a USB port on the short side.

LED5 is somewhat erratic. Most of the time it's off, toggling the power switch between positions sometimes turns it on for some time.

What would be the best testpoint for the voltage measurement?

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Looked at LED5 more closely - when turning power switch on (from off) - it lights up very briefly (1/10s maybe) and then goes off.

[Menon]

Hello,

This can be a hardware issue.

submargin said:

What would be the best testpoint for the voltage measurement?

nRF5340DK is supplied by the VDD_nRF net. You can measure this on the connector P20 by using a multi meter. Take a look at this page in our infocenter.

Could you also share a nice picture of your DK to make sure the hardware has not been tampered.

Kind Regards,

Abhijith

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The voltage between VDD_nRF on P20 and GND is 3.9v.

See below the photos of the DK.