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2014年9月19日に発売されたこの4.7インチ画面のiPhoneは、iPhone 6 Plusの小型バージョンモデルです。モデル番号はA1549、A1586、A1589で識別できます。

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iPhone not powering on.

I've been dealing with iPhone repairs for a few years but this one stumps me. I have a iPhone 6 that was initially mine and passed down to a few siblings and had a few screen and battery replacements. But on the last battery replacement the battery seemed to act weird. Put old one in was fine but didn't hold charge as well. The phone ended up just up and dying. Wouldn't charge. So I got the new battery from warrenty and tried that. Still won't power on. Got a known good battery still won't power on. Had different sceen that was good still won't power on. Replaced charging port still won't power on. Tried hard reset and all still no life. How do I figure if the logic board is my last issue or is the main issue? That's the only thing I haven't had to replace on a iPhone. Thanks in advance.

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Can you check if the phone is detected via iTunes? It may be turning on with no backlight.

You can also check if the apple logo is appearing when turning on by putting a flashlight on the screen.

If it's a no backlight issue, it can only be fixed via microsoldering (replacing backlight filter / repair backlight circuit) which some mobile phone repair shops and etc offer this service.

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If it isn't the back light, the power management IC may be the most likely to blame. They are known to go bad in iPhone models as they age.

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Kaden Seidel さん、ありがとうございました!
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