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Why is my touch screen not working

I bought a iPhone 7 Plus and I bought it as faulty as the screen was not working, so when I received it I got the screen replaced it started working fully then I repaired it I replaced the back housing which involves switching the motherboard after the repair when installing the screen back on there was a bit of adhesive on the the gold circles on the motherboard next to where the screen goes so I scratched the adhesive off with a screwdriver after that I installed the screen and the touch stopped working the phone turns but the touch does not work is there anyway I can fix this?

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“Scratching”, “Screwdriver” and “Logic Board” are not three words that go well together when it comes to iPhones :>).

I can’t really say I fully understand what you are referring to so perhaps you could add a picture to your post so that I can get a visual. However, I will say that based on your description, my fear is that you may have damaged the logic board. It could be a damaged connector or the tiny parts that surround the connectors. If you have a jewelers loupe or microscope (or just great young eyes!), take a closer look at the area you played around in to see if there is any signs of damage.

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Since the touch isnt wokring can it be the touch ic that needs replacing

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The Touch IC is embedded in the screen, not on the logic board.

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What do you think the problem is and can it be fixed?

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It could have internal damage. Apple also likes to screw with you because they don’t like people fixing there stuff for a reasonable price. So Apple will at times make things stop working or malfunction. Maybe check everything is where it should be and maybe try again. Or maybe get a new screen and try again. Hope that helps.

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I’ve tried 2 new screens both of them not working the touch is not working

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I don't really know then. I'm really sorry, hope it all works out. Have a good day

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Was the adhesive u scraped just the black slimy stuff around the housing edges??

I think the first place to start would be to try a new screen, remember to carefully remove the original home button flex

As minho said touch screen controller is on the screen itself, u could have done some other damage to the board as well but cheapest easiest and most logical course would be to try another screen first :)

Obviously first check the connector for the screen is fully plugged in sometimes the longer connector which is for the actual screen itself doesn't plug fully/ in so check thats firmly in first before trying a new screen

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Hi I’ve tried new screens and still the touch is not working the adhesive was on the motherboard it was a little piece of black adhesive in between the connector, I don’t know what’s the problem I think it’s a motherboard problem

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The adhesive u peeled off like a foam cushion around the connector, as uve peeled that uve probably knocked off a cap, resistor, filter or other ic off the board... really the best way forward is to check it properly under a microscope, try not to do anymore without having a look carefully under a scope as the ic and its pads might still be there poking it etc will just make it more awkward to repair

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