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iPhone 5S Touch Screen No Response

Th major part for iPhone 5S touch is IC U15. Touch screen has partial response or no response at all after the phone is dropped or damaged by water/liquid.



Steps to troubleshoot:

1) check with a workable screen to see if it is a defective LCD

2) LCD connectors may be short or open on screen and logiboard

2) reflow or replace U15










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Source of all circuit diagram are from Apple's schematic. iPad, iPhone, iPod, Macbook are trademarks of Apple company.