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Answer for iPhone 7+ touch screen not working after change display
12/26/2018
Is the touch screen works normally before you replace the display? There are two situations.
1. The new display you changed is problematic, change another one please.
2. Check whether there is a touch in the case where the 3D flex cable not connected, If yes, check the related circuit line whether normal of iPhone 7 Plus 3D flex cable connector. If it still not touch function after you finished those steps, then measure the diode of iPhone 7+ LCD/touchscreen connector, if it is normal then measure the voltage #19 of J4502 whether has a 5.1V
1. The new display you changed is problematic, change another one please.
2. Check whether there is a touch in the case where the 3D flex cable not connected, If yes, check the related circuit line whether normal of iPhone 7 Plus 3D flex cable connector. If it still not touch function after you finished those steps, then measure the diode of iPhone 7+ LCD/touchscreen connector, if it is normal then measure the voltage #19 of J4502 whether has a 5.1V
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