Chosen Solution
I replaced my charging port on my 7 plus step by step and now it is correctly charging but has no service. Wi-fi works. What antennae is not functioning correctly and what do I need to replace/ where did I go wrong?
Check thee two antenna cables (Step 39) in this guide. Also double check that the proper screws are in place as the LTE antennas are embedded in the housing and the screws a make all the proper connections.