Why is my WiFi Signal so weak?

Hello guys,

I have an iPhone 6 I dropped and changed out the screen unfortunate the screen wasn't the only problem. My WiFi range is approximately 1 Meter. So my iPhone must be very close to the router. So I changed out the WiFi flex and antenna module and nothing changed, yes I already did a hard reset. Does someone know what the problem could be?

Thank you in advance,

llaera