https://devzone.nordicsemi.com/f/nordic-q-a/43642/ble-concernHello, i&#39;m trying to program on 51422. The BLE signal,which runs well on 51DK, doesn&#39;t trigger any signal on my own PCB. i&#39;ve successfully light the LED on my PCB. i think it&#39;s some pin did not be configured well. I&#39;ve read the page ( https://devzoneen-USTelligent Community 13Mon, 11 Feb 2019 11:40:35 GMThttps://devzone.nordicsemi.com/thread/170735?ContentTypeID=1Mon, 11 Feb 2019 11:40:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38f5b91c-6bdf-44ea-a30f-0093dffb9df0Simonr<p>Hi</p> <p>What exactly don&#39;t you understand? As long as you have only set the GPIOs you are using, the unused ones should be in their default disconnected input state. Are you sure the pin configuration is the problem? I am sorry but this sounds more like a problem with the custom PCB. If your custom PCB has a lot of changes from the reference design from Nordic, the antenna impedance may have been compromised. Also how is your antenna layout? Please share a pdf of schematics and PCB layout, so we can rule out any errors with it. I have made this case private so you can safely share your files.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>