BLE service not working in custom Board based on nRF51822_xxAA.

[SamB]

Hi,

We have designed a custom PCB using the nRF51822_xxAA and followed the reference design.

- The board works on 3.3V supply. 16MHz crystal used. 

Only LED blinking program is working on this board (LED is connected to one of GPIO Pin). 

We had tried nRF51 _ SDK10 and SDK12.3 with related Softdevices and main programs. We have properly selected the softdevices as per the SoftDevice compatibility matrix. For flashing the Softdevice and main program we have used Keil uVision5 and ULINK2. First we had flashed the Softdevice and then main program.The BLE part is not working(i.e BLE advertising/BLE Uart progrmas). 

We have even tried to flash various ble_peripheral examples provided by Nordic but even then advertising doesn't start and the board is not visible to other BLE devices. Only LED blinking program is working without any problem. 

What can be the possible reasons for BLE not working?

Request to look in it and support.

[haakonsh]

Try changing the LFCLK source to the internal RC oscillator. The examples use external LF crystals, if there is something wrong with the LF crystals the examples will crash.