Released September 25, 2015. Model A1688/A1633. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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iPhone 6s screen goes off one time during boot

Hello, I replaced the screen on an iPhone 6s with an original (refurbished) replacement part. Since the repair, everytime I boot the phone, after a few seconds the screen goes black, then the apple logo appears again and it boots normally and works perfect most time, sometimes the touch isn't working, then I have to lock and unlock the phone and everything works fine. What could the issue be?

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Deck the Halls
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Is the phone on iOS 11?

There are lot's of folks complaining about strange issues with the iPhone 6S and iSO 11. The worst case is when Touch fails completely. I wrote up an article on this; you can go to my profile for a link if your curious. Seeing as how your replacement screen is a refurbished original, it should have a proper Touch controller on the flex. That said, I would try another screen to see if the issue persists.

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Yes, it's running on 11.0.2.

I got it from a customer, who had it repaired at another phone repair store which uses aftermarket screens and the touch wasn't working at all. I replaced the screen with an original refurbished (it's 100% original lcd) screen and the touch is working again, but as said, the phone reboots once at start and sometimes the touch doesn't work until turning the screen off and on.

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I tried many different screens (also an 100% original one from a new phone), disconnect all possible components which could cause the fail but still, the screen goes black once during boot and the touch only works after locking and unlocking the phone...

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In iOS11, it is normal for it to blank for a second during boot, it happens on every iOS 11 phone I've seen including my own phone (all original and unopened).

Make sure you have upgraded to iOS 11.0.3, as it specifically says in the notes that Apple fixed an issue where the 6S would freeze when not serviced with genuine Apple parts.

https://9to5mac.com/2017/10/11/ios-11-0-...

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Already noticed that, as I just had an iPhone 7 here for repair. After a downgrade to iOS 10.3.3 the screen works perfectly directly after boot, I will try flashing iOS 11.0.3 to see if it will also work...

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