https://devzone.nordicsemi.com/f/nordic-q-a/82608/nrf52-ble-radio-doesn-t-visible-on-custom-board-rtt-viewer-not-showing-anything-any-ideasHi, We made a custom board with nRF52 and it&#39;s BLE radio doesn&#39;t advertising, not visible on nRF connect APP. RTT viewer is not showing any thing. We used WLCSP package for custom board. I tried BLE Beacon App Template on nrf52840 DK works fineen-USTelligent Community 13Fri, 10 Dec 2021 07:25:56 GMThttps://devzone.nordicsemi.com/thread/342819?ContentTypeID=1Fri, 10 Dec 2021 07:25:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce7af796-dae8-4503-ad2e-4bc8a327861dMartin Sivertsen<p>Hello,</p> <p>This sounds like a hardware issue.</p> <p>Do you have a PDF with the schematic and hardware lyaout in Gerber file format + NC drill files?</p> <p>The first thing I suspect is the 32 MHz crystal as it is needed for the radio to work. I can either be a faulty crystal, bad soldering or improper capacitive loading.</p> <p>The second thing is a faulty RF front end. The nRF52840 should still radiate with a faulty RF front end, but you would get extremely low range, have you tried placing your custom board directly next to the receiver to see if it picks up anything?</p> <p>Does the nRF52840 work normally in every other way except the radio?</p> <p>Best regards,</p> <p>Martin S.</p><div style="clear:both;"></div>