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My son dropped his phone. The glass had some small shattering in the upper left corner and the digitizer won't respond to touch. So I replaced the glass, LCD, and digitizer. It still won't respond to touch. The replacement screen has tested good.
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@aldijaili , aldijaili , You could try a factory reset to see if that clears the problem. If indeed the new display tested good Mother Board could be damaged/bad. Take phone apart and try cleaning the connection on the board for the LCD/digitizer with a Qtip dampened with 90% or more Isopropyl Alcohol and look at all the pins for damage and while apart look for any loose/damaged/missing parts on the board and reseat all wire connectors and try phone. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
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If you are confident that the replacement screen works (tested in another phone), the problem is most likely located on the logic board itself. I would start by checking the LCD and Digitizer connectors to see if there is anything wrong (broken or unsoldered pins, debris, missing surrounding components etc.).
However, the iPhone 5c is known to suffer from micro-fractures due to the weaker plastic housing. These are quite difficult to see and usually require magnification in the 20X range and up. This also requires removing the logic board and unsoldering the shields. There may be a problem with the Touch IC's.
Depending on what part of the world you are in, doing logic board repairs on a 5c is usually not worth it financially, unless you have precious data you want to recover. Try my suggestions above and if they don't solve your problem, look for a repair shop that does micro-soldering repairs. They can troubleshoot the problem and tell you how much it would cost. Then you can decide if it is worth it or not.
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Tried a DFU restore but no change. Off that the case shows zero damage. Screen shows very little damage but this issue happens. I got some good pics of the connectors and they look fine. It's gotta be a crack in the LB or touch IC. I have a buddy at work who has a company that fixes phones (I don't have the time to have a side business). Maybe he'll buy it for parts. This one is frustrating.
door aldijaili