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After replacing my screen on my iPhone 6 I noticed the rear camera would not load (also the flashlight does not work). So I took it back apart and took the camera off and then put it back on and now the wifi is not working either. I have tried hard resetting and resetting network settings. I am on iOS 8.1 and jailbroken if that helps.

The phone 6 comes with a Wifi antenna which is connected to the logic board directly nestling up against the top plastic antenna stripe of the rear case. It will help the iPhone 6 to receive 3x faster WIFI. If the Wifi Antenna for iPhone 6 is broken, the WIFI signal will be weak or intermittent. you need the brand new iphone 6 wifi antenna

I have a device with exactly the same issue. Did you ever manage to fix the problem? Wi-Fi switch is grayed out on mine.

Damaged motherboard chips.

Hallo I just replaced my iPhone 6 LCD then wifi and Bluetooth disabled ( gray ) iPhone still working normally This issue damage in motherboard only or there is done other options If you can advice how to repair it Thanks