iPhone technically charging(usb amp meter), but wont turn on!

Question

iPhone SE

发布于2016年3月，是一款同时拥有着iphone 6s般的硬件规格以及4英寸屏幕体积的iPhone。有深空灰色、银色、金色及玫瑰金色四种配色以及16/64GB容量可选。国行型号为A1723和A1724。

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Najib @icedhand

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发帖于: 2020年4月1日

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iPhone technically charging(usb amp meter), but wont turn on!

Hello

last night i put my iPhone SE in charge after a dead battery, after a while i got a call, and i saw my screen acting weird(white screen with some vertical colors lines) and the phone turned off and wont turn on again.

I checked the LCD with another phone and it work, and checked the battery charging current plays from 0.5to 0.9A with an usb tester, and the battery voltage over 4V, i checked the motherboard and didn’t found a VCC main shortage, and my final check was to test the mother board with lcd, power button and battery plugged in, and the phone wont turn on.

Any idea what should i do or check next, please.

Thank you.

Update!!

I forced my iPhone to enter recovery mode, and i updated to iOS 13.4, but the screen is always black!! So the phone is partially working but no boot and no screen.

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daniel @tech_ni 声誉积分: 34.6千 10 22 44 · Answer 1 · 2020-04-03T04:51:45-07:00

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daniel @tech_ni

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发帖于: 2020年4月3日

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Have you connected it to iTunes to check if its recognised.

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Only if i put it in recovery or DFU mode.

由 Najib 完成的 2020年4月3日

Have you checked the backlight and nand circuits

由 daniel 完成的 2020年4月4日

@tech_ni

Thank you for replying.

No, i didn't check these circuits.

Question: Can the backlight circuit prevent the phone from booting? Because i didn't hear neither charging sound nor vibration feedback when putting iPhone into vibration mode.

And for the NAND circuit, i did an iOS update via recovery mode, so i think the chips works.

由 Najib 完成的 2020年4月7日

No bl circuit wont stop it from booting. Do you have a dc power supply.

由 daniel 完成的 2020年4月11日

@tech_ni

Unfortunately, no.

由 Najib 完成的 2020年4月14日

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