I updated to nougat then my touchscreen stopped working,?

HI all

when i updated my 4g play to nougat then the touchscreen stopped working .. it tried hard resetting and everything on the book i even disconnected the screen cables and reconnected them .. did not work .. .. the screen was working very good with no problems..

i have replaced it months ago and this one has a small crack a near the speaker . but what is the relation between updating the software and the screen anyway .

Thank you everyone