Default [Q] GPS doesn't work after replacing the Display

Hi there,
the Display of my One was broken (only the glass) and I did a complete Disassembly and replaced the complete Display-Unit with Front-Cover.
After Reassembly the GPS doesn't work. I tried Google maps, the GPS Status & Toolbox-App. The device won't find any Satelite.

I checked all the connectors i know, but nothing seemed wrong.

I don't think the GPS is broken cause of the Display-Damage.

Can anybody tell me where the GPS-Chip is located in the phone or on the Motherboard?
Is there a GPS-Antenna and if so, where is it?

Thanks in advance
Thomas