iPhone 7 plus touch screen not working

Amanda 12/10/2018

Hey! my iPhone 7 plus touch screen not working now, but I have changed the original LCD, it still not working, what should I do? please.
Answers

REWA

12/12/2018

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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