Weird NFC issue *Complex?*

I believe the whole point of the antenna is to ground itself to the case and be on contact with as much metal as possible to amplify it's signal? I have also tried a different screen as there are little contacts that attach to the frame transmitting signal but no result...

@iphonerepairtom - grounding nullifies the signal! Give this a read Faraday Cage either surrounding the emission or shorting it out cancels the signal. Unlike the other antennas, NFC uses a tunnel design to limit its spread outward. Here’s more on the design NFC Antenna Design Made Easy

Thanks Dan, so it's the other way around. I don't want to make a metal to metal connection with the NFC flex as that nullifies the signal?

@iphonerepairtom - This is a bit tricky! The emissive area of the antenna needs to be exposed so the signal can come in or out into the open air. But there is a shield that surrounds the antenna lead (not shorting it out) think how your cable antenna lead is a COAX cable surrounding the antenna wire (shielding it) not touching it. Even in fiber optic’s we do the same making a reflective surface to contain the light the length of the distance!

I understand! Have you had issues with this before? I have done lots of housing spaws before and never had this issue. I do the same procedure every time. The NFC is not broken as I have tried a replacement part and it works when the display is lifted from the housing. Once the display is closed NFC stops working. I have an identical phone that I've done the same procedure on and everything functions well. Could it be a faulty housing?