On this iPhone¬†7 we’ve¬†repaired broken data line on a second¬†layer of the logic board after the customer tried to replace the LCD screen and accidentally¬†used the wrong screw on the wrong screw hole and after that, because the screw¬†was long it damaged the logic board and broke the touchscreen connectivity data line between CPU¬†to LCD connector and because of that touchscreen wasn’t¬†working at all. so we fixed the broken¬†data line and touch screen starts working again.