Chosen Solution
I have changed the rear case of my iPhone 6 following this steps: iPhone 6 Rear Case Replacement And now, when I finish, everything on my iPhone is ok, the camera, the bluetooth, GPS etc .. but the wifi does not find any network, it keeps looking and simply does not think. What can it be? I was extremely careful, no screws were placed wrong, all parts were replaced correctly …
In the iPhone, the case is part of the antenna. Therefore, everything has to be connected correctly. Some parts have conductive foam to insure continuity between one element and another. These are the parts I would focus on: There are screws underneath this moduleThere is conductive foam on the gold pad of this flex (both sides)The antenna also connects via the motherboard signal cable (see below) down to the charge portMotherboard Signal Cable