Failed to connect to target.No idcode detected. Please check the connection and target interface type.

[Muqarrab]

Hi,

I have started development on nRF52840 DK.

I have 2 boards one is working fine but the other one making an issue. When I tried to connect it shows the following error. I have changed the cable which is working properly with the 2nd board. 

I am using the SEGGER Embedded Studio. When I tried to Target->Connect J-Link I got the following issue.



I have also this version.("nrfjprog --version")






When I copy (G:\Work\RoboArt\nrf\DeviceDownload\nRF5SDK17009d13099\nRF5_SDK_17.0.0_9d13099\examples\peripheral\blinky\hex\blinky_pca10056)
this file in JLINK folder Board restart and I found a text file with name FAIL.
Which include "Error while connecting to CPU"


Is there any solution for this, please?

[Muqarrab]

I more thing that LEDs are very LOW HIGH like garbage voltage. As shown in the attached image