nRF52832 PCB designed by myself can work normally， change chip to nRF52840 not advertising(Phone can't scan)
The project folders for nRF52832 and nRF52840 are different (namely PCA10040 for nRF52832 and PCA10056 for nRF52840).
Make sure you have selected the correct project for each. Also try the debugger mode to exactly know where its getting stuck (if it is).
Also please mention how you are programming it and the SDK you are using.
Correct me if I am wrong, you have a custom PCB for nRF52832 and you replaced the nRF52832 chip with nRF52840?
