Answer to "Touch screen problems after screen replacement"I am the owner of iphone 5s 16gb, and after back case and display replacement i have trouble with screen. I cant click correctly on upper corners. I 1st step i do, is replace from the old display all insulation tape, 2. place insulation tape on every connection (LCD, EARSPEAKER, and 3rd) 2/3. DO NOT turn OFF your phone. 3. dissemble the touch id and open the phone, 4. remove metal bracket (4 screws) 5. disconnect three connectors from display(WHEN IPHONE IS TURNED ON!!!) 6. wait a moment and place the connectors back, 7. unlock your iphone and try. 7/2 if everything works, put bracket back, put back touch id and place it back. 8. that works for me !