3 screens from 3 suppliers but no touch response

I have gone through 3 screens on a 6plus. different orders and different places to order from. I for the life of me can not figure out whats wrong. I am using all ifixit tools. Antistatic tools. etc. but for the life of me cannot get touch to work. its the same thing one two phones. Did i do something wrong? is there a pin or ribbon that controls the touch so i can inspect in better detail? I am at near 950 repairs now, and always follow the guides even tho I know the steps, my screws are organized the way i take them out. Organized. do i just have the worst luck? I dont have money to invest in more screens :( my exchange rate makes them near $200 for me after shipping and everything :(