same issue on lcd even after trying few different lcds

Hi all,

i think i need your expert opinions..

so i have iphone 6 which i changed a few things.

the back housing, lcd, battery to be exact.

the phone still works, the only thing is that the bottom of lcd where the keypad is displayed, the thouch is not really responsive.

so pretty much i am having hard time pressing

1,2,a,s,z,x

the button to change the keypad to number registers.

1 ,a,z is realy hard, and if i t try the 2,w,s,x buttons the ones next to it on the right registers.

initially i thought it was lcd issue, so i went to 3 different suppliers(all after market as i dont know where to buy original) and they all have exact same issue, meaning it is not lcd.

i tried applying pressure to the connector bits, as the foam pads are not present on after market lcds and still the same.

so my question is, should i change my phone or is there still a way to salvage it?