https://devzone.nordicsemi.com/f/nordic-q-a/59958/no-idcode-when-attempting-to-connect-to-bmd-340-dev-boardWhile I was working with my dev kit this morning, the board has suddenly stopped responding to commands. When I attempt to connect via jlink using Segger Embedded Studio, I get an error saying that there was no idcode found. I looked up and attempteden-USTelligent Community 13Wed, 08 Apr 2020 12:19:58 GMThttps://devzone.nordicsemi.com/thread/244076?ContentTypeID=1Wed, 08 Apr 2020 12:19:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:51fabdf5-a371-4ac6-9018-ea4b28d31a1dVidar Berg<p>Hi,</p> <p>The log indicates that the&nbsp;problem is with the communication between the Jlink and the&nbsp;nRF52840. Probably not very helpful, but at least&nbsp;it tells us that&nbsp;the PC to debugger connection is likely ok, so not caused by a bad USB cable or hub.</p> <p>I&#39;m afraid I don&#39;t have a lot of ideas of what you can try as&nbsp;it is sounding like a HW issue, but one thing I would suggest is to try running the&nbsp;Jlink commander application (executable named JLinkExe on MacOS)&nbsp;and check what the reported &quot;Vtref&quot;&nbsp; value is (ie target voltage). It should be around 3V.</p> <p>&nbsp;<img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-632a765f1d594639a810793a67005463/pastedimage1586348361470v1.png" alt=" " /></p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>