nRF52840 custom PCB Radio not working

Question

Hi

I was using the MESH SDK 5.0.0 Dimming Server Example on nRF52840 DK and Dongle it worked fine so i designed a custom Board according the Designrules of Nordic. 
 Setting: 
 PCB is a 4 Layer 1.6mm, both Cristal where mounted (same Types as on the DK Board) 
 
 (Backside) 
 Antenna is an Inverted F Type 
 
 Antenna path 
 Programmig and powerdelivery is made over the nRF52840dk OS: Win10 with nrf Connect Toolchain 
 
 Faliture: 
 Device is not transmitting any Bluetooth beacons, App Timer is Running as expected. 
 RTT is printing no Error ->similar to DK (with different UUID). 
 Outputs react as expected. 
 
 I had checked the following Points: 
 - Erased the Chip with nrfjprog --recover --Family NRF52 --Log 
 - HFXTAL on Register 0x4000040C is 00010001 -> 32Mhz Cristal is Up and Working 
 - LFXTAL on Register 0x40000418 is 00010001 ->32Khz Cristal is Up and Working 
 - Powersupply external 3.3VDC -> No change 
 - I tried the same Steps on a second (similar) Board with the same behaviour. 
 
 Question: 
 What could i investigating to resolve the issue.

Simsim · Answer

Hi Jonathan 
 The Source of the error was obvinious visible, but we didn't see them. 
 The HFXTAL Load Capacitors should be mounted beween GND and X1/GND X2. So the Crystal was without load, seems to oscillate but as far i can say not very reliable. 
 After bugfixing the C-Load 2x12pF the Register look the same but then i the Device showed imediatly up an had a stable connetion to the Mobilephone. 
 So this case could be closed. Thank you for the quick response and the well based tecnical help from your side. 
 Kind Regards 
 Simon