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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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Screen and buttons are unresponsive periodically after a screen repair

Hello everyone!

I'm having an issue with an iPhone 6s where the whole phone becomes unresponsive several times in a day after replacing the screen; by unresponsive I mean the whole phone becomes a paperweight as the screen nor any of the buttons respond. The only way to get response back is to wait for the phone to lock itself.

My thought was that it could be a bad screen but I have never seen a phone respond this way (where the whole phone is unresponsive). Any ideas as to what I should do or check for?

I appreciate any insight!

Answered! View the answer I have this problem too

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Welcome to the world of iPhone repair. Things that make no logical sense happen all of the time. Should a bad screen lock up the whole phone? NOPE! Could it? YEP! Have I seen it? Sure have.

You have to look at the situation from a bit different perspective: The phone was damaged, which caused the screen to go bad. Once the screen was fixed, the phone had issues it did not have before the damage. So the question is; does the phone lock up because of the damage or because of the screen?

The easiest way to find out for sure is to try a new screen. Yes...I know that means you have to take the phone apart again. But it will either eliminate the screen as the failure or confirm it. You are hoping that it confirms it. If its not the screen, then its more than likely something board level which gets really expensive, really fast.

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Right. I'm hoping it's not something at the board level because that is beyond my capabilities but I'm thinking it's the screen because my customer had a broken screen for awhile and it did not act like this until a week after I replaced their screen (or so they reported).

I've seen some odd results dude to poor screens in the past but nothing like this so I wanted to make sure it wasn't caused by something else.

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I would try a second screen in this case. If that doesn't fix the issue, I would try a software update if you have one, and if not back up your data and try a restore. If none of these things works then there is more than likely damage to the mainboard or failing components on the main board.

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Looks like a brand new screen fixed up the issue!

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Sounds like a bad Touch IC.

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I thought so as well but it turns out that the Touch IC is "built" into the screen. Unless you were implying that the Touch IC on the screen is bad. Could a bad Touch IC prevent the use of the Home and Lock buttons from being responsive?

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The Touch ic is a small chip on the logic board And yes a touch ic malfunction can cause this issue as it messes with the processors ability to process other signals coming from the phones other components

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Bentley is correct. On the iPhone 6S, the Touch IC's are on the screen assembly and not on the logic board.

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Actually all the chip on the screen is is a glorified signal amplifier for your digitizer. And is not the touch ic. The touch ic is located on the logic board.

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Look at the Touch IC section of the schematic of previous iphones and ipads. The Touch IC's drive the capacitive touch on the digitizer and they are, in fact, a "glorified signal amplifier". They then communicate the results of the touch input via a serial bus to the SOC. You will also note the evolution of the design from Nimbus, Cumulus and Cumulus/Meson.

Now, the 6S series has a new IC that does everything Cumulus and Meson did before plus the 3D touch features. That is the 343S00014 and it is on the screen assembly.

Have you looked at the 6S schematic? I challenge you to find the Touch IC on the schematic or any source that shows Touch IC's on the logic board.

Here's mine: http://www.chipworks.com/sites/default/f...

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Bentley will be eternally grateful.
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