Really weak signal strength gps and Wi-Fi

I had to replace my screen for a Huawei mate 8. I ordered this from China.

Ever since i installed the new screen though, my Wi-Fi and gps strength is extremely bad.

Often to the point where my gps thinks I am in a completely different location.

Does anybody know where the issue is and how to fix it?

I already tried a factory reset, reseating the antennas, and clearing the cache.