Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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Digitizer replacement intermittent failure - works half the time.

About 6 months ago I replaced my iphone screen and digitizer from a combo that I ordered on this website. I removed the ear piece, home button, front camera and moved into the new screen. All good no problems. Put the phone back together all is fine and dandy. About 5 months in the digitizer stops working properly. I will be on the phone for a minute or two and all of a sudden it will stop registering touch completely. The only way to fix it is to turn it off (standby) and back on. Not a terrible inconvenience at first but the frequency has increased dramatically. Sometimes it wont register at all and i will have to keep turning the power button on and off until I get it to work again. Sometimes I cannot even answer phone calls. The phone is nearly useless now. I am curious as to whats causing it? I am assuming it is a digitizer problem. I have updated the phone to the latest firmware and have rebooted multiple times. If someone could explain what I can do to fix this is would be greatly appreciated. Thanks.

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You may have a bad digitizer. If you bought your screen from iFixit, then it is probably still under warranty, unless you dropped and damaged it. Contact help.ifixit.com to see if your screen is covered. That would be the first and easiest thing to check.

However, your phone may also suffer from "Touch Disease". At first, the phone will typically develop intermittent touch control failure. For some phones, a gray/white bar starts appearing at the top of the screen. Twisting and applying pressure in certain spots sometimes allows touch control to work for a short period of time, but eventually, the touch interface ceases to function entirely. You can look at my profile for a link to a blog article on Touch Disease or search the web for more info.

Ideally, you need to isolate a variable and either identify a known-good screen or test your existing screen in a working phone.

If you are confident that your replacement screen is fully functional and there is no damage to the Digitizer FPC connectors on the logic board, then your phone probably suffers from Touch Disease. This is not a DIY repair. You will need to find a repair shop that does micro-soldering repairs.

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This is board problem most likely. The touch chips got knocked loose during the fall.

There is an illusion that something broke, replace something and it will work again. Modern electronic devices are too integrated for that to happen and you need professionals to find the exact problem and attempt repairs.

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