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2014년 9월 19일에 출시된 이 4.7” 스크린 iPhone은 iPhone 6 Plus의 작은 버전입니다. 모델 번호 A1549, A1586 및 A1589로 식별됩니다.

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How can a home button/touch ID be the cause of an iPhone shutting off

This is a follow up question from my previous question about a water damaged phone. You can find that by searching in my questions.

To summarize, the iPhone I'm trying to repair would shut off or wouldn't turn on unless the home button/touch ID was disconnected. I thought it was the phone until I swapped the LCD and everything works. Mind you, it was under water but with the LCD swap, everything works.

This sparked my curiosity but also, I want to try and salvage the touch ID. What could be the reason? Can I just swap the flex cable? Testing will proceed, I just want to see if anyone had any experience with this.

Please help!

Thanks!

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It certainly sounds like the button is shorted. You could try cleaning the "fingers" on the end of the cable. But my guess is that the water got in between the button and the ring. Not good and probably fatal. The button assembly can only be replaced by Apple. They have a magical process that "marries" the button to the motherboard. It's a security thing. Best of luck.

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Yeah, the connectors look fine under a magnifying glass. I don't have a microscope at the moment. I'm thinking it's the button. I understand their security concern but I personally think the button mating is over the top. I guess I don't fully understand it. What benefit does a thief have by swapping a button unless they store the fingerprints in the button itself which in itself is ridiculous

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I don't know the details but they wouldn't do it unless it made the subsystem more secure. Security of iOS devices is becoming Apple's major selling point...and that makes me happy. Hope you can get it fixed.

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I believe you're right, something must have gotten stuck inside. Here's why I think so.

I cleaned all the connectors and it still didn't work so as a last ditch effort, I soaked the entire button in rubbing alcohol and shook it for a while. Here's the crazy part.

It finally turned on and didn't give me the error saying it was unable to use touch id but the actual touch didn't work for another 3 days. After 3 days, literally everything began to work like new. What!!?!?!?!? Originally it had touch issues and proximity sensor issues but not after 3 days. The more I learn, the less I know. I may have to make another question for this one.

Any thoughts on how this happened?

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Usually these get damaged from moisture going into the home button itself or the connector on the home button extension cable. Basically corrosion.

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So you think the corrosion flaked off after the three days? I guess that makes sense. I also changed the battery to a better one so maybe that helped

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Not so unusual..anything in which you have a flow of electricity can get shorted and liquids are the best to do the job. If you have a microscope and enough patience you'll be able to see that, probably in some connector pins of the board or of the touch id button. Flex can't be swapped. I've seen someone on youtube surgically precise with a soldering iron to cut off and resolder the damaged part through joining two flex cables together..depends on your level of skill :)

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I don't think it's in the board since it works fine now that I swapped the LCD along with the home button. By flex, I mean the long middle one stuck to the LCD back panel, not the one connected to the button. I have 2 iPhone 6's to work with so I can play around with those. I'll update when I swap test. Thanks for your reply!

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You can substitute the home button (on the short flex) with an after market one (they are very cheap about 5$) but this will not revive your Touch ID facility as you will know the originals are manufactured to uniquely pair with each motherboard.

Everything else should work on the new button.

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I did what you suggested and it worked fine. It was definitely the button. See below to see what ultimately happened. Crazy!

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