Face ID Problem- flood illuminator

Hi

I’ve bought from my friend smashed iphone on both sides. Ive repaired it to a brand new condiction- screen and other things are original paired by apple.

There is no error in face id. Main problem is when I try scan, it doesnt recognise my face, its say take phone upper, now lower and… nothing. I’ve found that might be a flood illuminator. I can do soldering by myself but… does this sensors are paired to face id? I wonder if I can replace them (they are mounted to screen with speaker by 3 screws).