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

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iPhone is not booting. Screen flickers

Hi.

Have a problem with an iPhone. It won´t boot. When it tries to boot the screen suddenly flickers in many colors and then reboot.. It does this two times, and after that it´s not possible to turn it on before the battery is disconnected and reconnected.

I have tried several (original) screens and batteries. Anyone know what might cause this problem?

Here is a video showing the problem:

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What model iPhone? The 5 and 6 gens can be damaged by installing the screws in the wrong place causing damage to the motherboard. You would need a microscope to see it. You can search "Long screw damage" or "blue screen of death" (BSOD) to see more symptoms and causes. The only repair for this is highly skilled trace damage micro soldering which very few repair shops can perform.

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I've put it under a microscope today, and there is no damage on the motherboard (where the screws are)

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It looks like you might have damaged the logic board try checking the logic board to see if possibly chipped any parts.

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