"Below are the three WiFi signal adapters. Usually bluetooth isnt effected by anything but the board connector, however, your wifi signal could be caused by multiple antennas.
https://www.etradesupply.com/apple-iphon...
https://www.etradesupply.com/apple-iphon...
https://www.etradesupply.com/apple-iphon...
If you replace these three antennas, and your issue is still not fixed, then you are looking at a Radio IC Failure. The IC used to process the WiFi, and the Blutooth both go through the same Chip on the board. in which case, you can replace the Logic Board, or take yours to someone with experience in SMT to fix the board you have."
