No connection with nRF52840 DK from PC via USB (J2)?

[KPC_Lunav]

Hi,

I saw a similar post (Case ID: 249969) and this just happen to me.

I have not used my nRF52840 DK for a few weeks. It has been in its original plastic bag the whole time. Connected it today and nothing happen (no light on LED5), no responds from Windows that it connected. I also plugged in a nRF52 DK on the same USB cable and that "turned" on, LED blinking and I could connect to it with the nRF Connect application (v3.3.3) and programer v1.4.2.

made sure it was like below:

I checked power on TP11 and TP12 - found 5V as expected. I also checked other TPs and found 3.19V (TP31) and 4.65V (TP32).  Also measured 2.98V on VDDnRF and same on TP7.

So I'm very curious on what has happen with my nRF52840 DK?

Could it be something wrong with the interface MCU? IF BOOT/RESET button?

Any suggestion would be appreciated.

best regards,

Peter 

[Simonr]

Hi Peter

When connecting the board to your computer (using J2), do you see it as a JLINK device on your computer at all? If so, you can try to drag and drop the MCU firmware .bin file, downloadable here, into the JLink drive to see if that helps.

have you used this board for current measurement perhaps? If so, check if solder bride SB40 is cut. If it is, you will need a jumper on pin header P22 in order to make the board run as normal. Can you also provide the markings on the board, PCA10056 and so on? You should also check the board physically to see if any components seem to be missing.

Best regards,

Simon

[KPC_Lunav]

Hi Simon,

The this is the specification of the DK:

I have only used it for programming other nRF52832 and nRF52840 boards via P19 with a Tag-Connect cable. I have not performed any current measurement etc. all solder bridges are intact as original.

The JLINK device is not available when I connect the Dev Kit to my PC. However, it shows up as expected when I connect the nRF52 DK. 

All components on the board seems to be intact. 

Peter