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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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iPhone recognized by itunes, but screen, speaker, buttons don't work

Hi,

I got an older iPhone 6 from a customer that traded it for a newer one. The problem is, that the screen is black, and have tried with another screen to no avail.

The iPhone gets recognized by itunes, but it doesnt react to home+lock button press for resetting, and the mute button does not activate the vibrator.

The speaker is also mute.

Can this one be saved? Are there too many things burned on the logic board to get fixed, or are there some easy tests to perform to make it work?

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I think you answered your own question, if the logic board has a lot of burnt out parts then the phone would only be good for that - Parts.

Things like the ear speaker, charge port, front camera sensor, home button etc would work on working phones. But most likely not that one

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But is does not seem like the phone has had any water damage and looks very clean inside - the only way to really test, i guess, is to move the board into a phone with the internals working?

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Check if the phone is showing image but no backlight.

You can check this by shining a flashlight on the middle of the screen while the phone is turning on at the apple logo part.

If it's displaying image and no backlight then the issue lies within the backlight circuit of the logic board which requires microsoldering to fix the issue.

Also this can be a case of long screw damage / damaged screen connectors on logic board.

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I can try that. But how come it doesn’t respond to any of the buttons?

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Phone could be on silent, with sound and vibrate turned off. So it's hard to tell if the buttons work or not.

Try plugging the phone into a charger with the vibrate / mute switch turned off.

You should be able to hear a charging sound when you put your ear next to the loudspeaker filter located at the bottom right of the phone.

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There is absolutely no sound or vibrtation, not even when you plugin the cable nor enabling/disabling the mute switch

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Carsten Panch Isaksen 님은 대단히 고마워 할 것입니다.
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