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2017年9月22日発売。モデル番号はA1864, A1897。GSM もしくはCDMA/容量は64もしくは256GB/仕上げはゴールド、シルバー、スペースグレイ。

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iPhone 8 Plus Boot Looping After Repair

Hi, I have an iPhone 8 Plus that started boot looping after a battery replacement and charging port replacement.

I attempted to replace my faulty charging port and also replace my battery on my own. I replaced the charging port without removing the logic board. When I replaced my battery, I used 99% Isopropyl Alcohol to loosen up the adhesive strips. However, I accidentally spilled some droplets of 99% Isopropyl Alcohol onto the logic board, however I think 99% Isopropyl Alcohol should be harmless on electrical devices. After putting back the phone, my iPhone 8 Plus started boot looping.

I discovered that during the process of removing my old battery, I accidentally disconnected the rear camera assembly connector from the logic board. After attaching it back onto the logic board with both a new battery and a new charging port installed, my iPhone 8 Plus is still boot looping.

Some diagnostics I have done are:

1. Connect my original battery back onto my iPhone 8 Plus to see if perhaps the new battery I bought is faulty. I still have the new charging port connected. The result is still boot looping.

2. Connect my old charging port back onto my iPhone 8 Plus to see if perhaps the new charging port I bought is faulty. I still have the new battery connected. The result is still boot looping.

3. Connect both the old battery and old charging port back onto my iPhone 8 Plus. The result is still boot looping.

4. I was able to put my iPhone 8 Plus into Recovery mode by pressing volume up and volume down and holding the lock side button, but my Macbook can't register that my iPhone is connected to the Mac.

My display was only disconnected from my phone body so I could perform my repairs. I did not disassemble the home button or the front-facing camera on my display.

I did not remove the logic board, but only accidentally spilled 99% Isopropyl alcohol on the top black layer of the logic board.

In hindsight, I should've replaced the battery first, then put the iPhone 8 Plus back together and tested if it worked, and then proceed to change the charging port.

Is there anything I could do to try to fix the boot loop on my iPhone 8 Plus? Thank you.

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Hi Duc,

Personally I don't think you were wrong in your approach to replacement; do it all at once and get it over with. There would really be no reason to expect a problem.

You mentioned using the alcohol to loosen the battery adhesive; did you do that just to try and improve your odds of success, or because the tabs broke off and you were forced to pry out the battery. If the latter, I'm wondering if there's any chance a flex cable under the battery perhaps got damaged in the course of getting a stuck battery out. Just one theory.

Personally I am skeptical that getting isopropyl alcohol on the logic board would have caused problems; I mean, people soak boards in the stuff after they've been exposed to water; the whole point to it is that it evaporates without leaving any residue, especially the 99% stuff you used. I wouldn't spend any more time on that issue if I were you.

Other than the possibility of any flex damage, you'll want to double check the lightning port and battery connectors on the logic board. Use a magnifying glass and a bright light and look for any bent or broken pins; in addition, check around the connectors for any small components that may have been damaged or dislodged from around them.

If you still haven't found the problem, try to isolate it. Try disconnecting other components and see if it has any effect on the boot process; in particular the iPhone 7 had a lot of problems with the front camera assembly where those would frequently cause boot loops, so try booting with that disconnected. If not that, try as many other connectors as you can; rear cameras, wireless charging coil, taptic engine, etc. If anything changes the behavior that's likely your culprit.

One thing that is somewhat confusing me is your statement that you removed the lightning port assembly without removing the motherboard. I'm curious how you accomplished that since part of the flex cable runs underneath the logic board so I'm not clear on how you got it out with the board in place.

Anyway, give some or all of those ideas a try and let us know what you find.

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Hi Jerry,

I used alcohol because I ended up ripping all 4 adhesive strips with my tweezers that kept the old battery in place. After applying some alcohol, I used the Spudger to pry up the battery relatively easily because it was loosened up by the alcohol.

I don't recall any flex cables underneath the battery. From what I saw, the adhesive strips have a curvature cutout to them to wrap around where the wireless charging hole is in the back of the phone. Basically, the battery is attached to the aluminum alloy part in the body of the iPhone.

With the lightning port, I didn't use any alcohol. I simply just pried up the lightning port removing it from being glued to the aluminum alloyed part of the iPhone body. I didn't see any flex cables under the lightning port.

If you're interested in how I removed the lightning port assembly without removing the motherboard, I would refer you to this youtube video tutorial that I followed roughly at the 13:20 minute mark: https://youtu.be/KEhEAtUZOjo

さんによる

Hi Jerry,

To also update you on what has happened since I posted this question, my phone was boot looping for a few hours and the battery died.

The "empty red flickering battery with the lightning cable" icon showed up indicating that the battery needs to be charged so I thought this would be the time to test if my newly installed lightning port assembly works or not. I plugged my iPhone 8 Plus into my MacBook Pro and the icon switched from the "empty red flickering battery with the lightning cable" icon to the "solid red battery" icon indicating that is charging.

A few seconds later, the apple logo appeared then the phone proceeded to boot loop again.

I disconnected my display from my iPhone and unplugged all flex cables attached to the motherboard: display cables, rear camera cables, lightning port assembly, battery, etc. I didn't remove the motherboard itself from the phone. I quickly eyeballed each connector and port to see any bent, damaged, or broken pins.

さんによる

Hi Jerry,

I connected all connectors back to their ports, making sure I have a solid connection and tried to turn on the phone while being plugged into my MacBook Pro.

The Apple logo first appears and then disappears. What comes next is the "solid red battery" icon indicating that it is charging. It has been showing this "solid red battery" icon for hours now and still hasn't booted on.

I will now follow your advice and go through the connectors and ports with a magnifying glass to check for any damaged pins, as well as try and isolate the culprit.

Do you think this iPhone 8 Plus being Jailbroken on iOS 14 has anything to do with the operating system not booting up properly?

さんによる

@ducknguyen14 I don't have a lot of experience with jailbreaking iPhones, but boot loops are usually the result of hardware errors; however they can be caused by software too. The fact that they started after the repairs makes me lean toward the hardware side though, since it wasn't boot looping before you worked on it.

さんによる

@dadibrokeit Did you happen to watch the tutorial I referred you too? Do you think I may have damaged the motherboard by performing the lightning port assembly replacement the way I did according to the tutorial?

I'm thinking to get a hold of a working spare iPhone 8 Plus and swapping my logic board into the working iPhone 8 Plus to see if it will boot on. As well as swapping displays, batteries, etc as a process of elimination.

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Duc Nguyen さん、ありがとうございました！
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