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Logic board works in antoher Ipone 4


I have an Iphone 4 that was, what i thought, completly dead. The cause was probably water damage. I tried everything to get i going but it seemed "fried". However I got an idea to try the logic board i another working Iphone 4 that i´ve got and to my surprice it seems to work fine. I then tried the functional Ipone´s logicboard in the busted chassi and it too didn´t work.

What could be the reason for this? Could it be some flex cabel that is busted or some grounding problems?



Отвечено! View the answer У меня та же проблема

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Hey Jonas,

Sounds like there are a couple of things that could be causing this problem. The most common, and easiest, is that the battery could be dead. It is a pretty easy fix and we have the guide for it right over here. If that isn't you issue, it could be a problem with one of the connectors or flex cables, but you should be able to notice any physical damage to those parts. Additionally, it might be an issue with the dock connector, another common ailment with this device. The guide for replacing the dock connector is linked in that second link.

Luckily, you seem to have a fully functioning secondary device with you, so you can use parts from it to test out the broken device without having to purchase anything. I would recommend that you start by swapping out the battery in the dead device for the battery you know is working. If this solves your problem, you will know that the battery was the issue! If that doesn't do it, try the same thing with the dock connector.

Side note: Just to state the obvious, couldn't you just put the logic board from the dead iPhone 4 in the working phone and use that one? Of course, then you have a dead phone laying around just asking to be fixed, I guess.

Either way, I hope this helps! Good luck! Let us know how your repair goes.

iPhone 4 Аккумулятор Изображение


Замена аккумулятора iPhone 4



iPhone 4 Dock Connector Изображение


iPhone 4 Dock Connector Replacement



45 minutes - 1 hour

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Thanks for your thorough answer. I actually did try the battery in another phone and it worked there. I´ll do as you suggest and test the dock connector.



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ive had the same problem, the middle housing seemed to be shorted or needed grounding or something, it wouldnt let another motherboard power up

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Did you solve it on your phone?


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Jonas будет вечно благодарен.
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