Not a solid reason behind on your iPhone screen lines vertical is showing on screen. Also that’s affecting or making screen unresponsive. When you type from keyboard or access from the selected portion of the screen. This is the most common problem mostly all iPhone model since iPhone 5, iPhone 5C, iPhone 5S, iPhone 6/ 6S, 6 Plus/ 6S Plus.
Vertical Lines on the screen is notorious problems that’s fighting most of the people by restart or reset iOS device. Yes, it would be some time help but not all the time. For my iPhone 5S when I faced, I search on Google and found simple solution in video tutorial. And it was made my day.
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Note: Please, Make sure about your iPhone is in under warranty or not. If yes, then must go to apple store. Once you opened your apple device by own self, Apple will not take responsibility of that in next time.
Fix on Primary Reasons step by step for iPhone screen lines vertical: iPhone 5S/ iPhone 6
Chance to get vertical thin lines on screen is due to heavy bump or fall down on Ground from hand unexpectedly. Because loose connection between screen and processor has been formulate this problem. That’s you can fix own self with proper Apple Device repair kits and Tools.
See my source video tutorial helped me out on fix Vertical lines on iPhone screen making unresponsive near to that lines area.
Temporary solution: on your keyboard selected portion near to line is unresponsive then use keyboard in landscape mode (Swipe up finger from bottom to up > Tap on Round arrow with lock) where lines not overlaying keyboard.