Boot loop with red screen and won't enter Recovery nor DFU mode

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iPhone 5s

苹果 iPhone 5s 于2013年9月10日公布。该设备的维修与以前的型号相似，需要螺丝刀和撬棒。可使用GSM或CDMA / 16、32或64 GB。颜色有银色、金色和太空灰。

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Caleb @lrt

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发帖于: 2017年8月19日

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Boot loop with red screen and won't enter Recovery nor DFU mode

I have been given an iPhone 5s to try and repair that boot loops. When you hold down the home and power buttons together the screen goes red before shutting off. The screen had a crack in the top left corner, so I bought a non working 5s off eBay to use as a parts donor. However, even with the new screen fitted, (with screws in correct positions) the phone still boot loops as before. I cannot get it into recovery nor DFU mode to be able to reflash it with the 3U Tools program.

I presume this has suffered a NAND failure when it was dropped?

None of the water indicators have activated and the interior of the phone is in excellent condition.

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Ohhh, yeah, maybe most people have these stupid problem....

由 miriamgreen 完成的 2017年8月19日

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Ben @benjamen50

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Mtwo Perform

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Have you tried unplugging the front camera ribbon cable from the logic board and see if it boots?

A faulty front camera assembly can cause red screen of death bootloop.

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Thanks. No I haven't tried that, I'll have a go when I get the chance.

However I did swap the whole display over except for the home button. It could still be faulty though.

由 Caleb 完成的 2017年8月19日

I disconnected the front camera ribbon cable and tried restarting it. It didn't make any difference. So I tried the unbroken screen. It also keeps looping with a red screen but only half the display lights up with flickering bars.

So I decided to try swapping the battery over to the donor phone to see if I could get it to work. Although it's passcode locked, both screens work perfectly and the phone boots up normally without any red screen. Seems as though this phone has a problem elsewhere.

由 Caleb 完成的 2017年8月20日

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Thanks. No I haven't tried that, I'll have a go when I get the chance.

However I did swap the whole display over except for the home button. It could still be faulty though. — Caleb
I disconnected the front camera ribbon cable and tried restarting it. It didn't make any difference. So I tried the unbroken screen. It also keeps looping with a red screen but only half the display lights up with flickering bars.

So I decided to try swapping the battery over to the donor phone to see if I could get it to work. Although it's passcode locked, both screens work perfectly and the phone boots up normally without any red screen. Seems as though this phone has a problem elsewhere. — Caleb

iPhone 5s

Boot loop with red screen and won't enter Recovery nor DFU mode

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