Chosen Solution
Hello, I have a iPhone 4S, touchscreen stop work after LCD replacement (Broken). At first i think it may be from new LCD but after test with another one i have same result, no touch… Sometimes after plug and unplug flex it start working, but after sometime or reboot no longer work. (This happen with a few trys) Flex and ports are not damaged, pins are normal. I have try to clean many times without success.
What can be?
If you are sure the displays you have tried are working, it pretty well narrows it down to board level problems. It could be the digitizer connector on the board or possibly the touch IC. I’m just not sure how far you want to go on a device that old. I’m usually pretty gun shy about going in too deep on those, since you are almost guaranteed to break something while you are in there.
