⟐ Answered 五月 04, 2024 at 16:27 GMT-7

Was being the operative word here, right up until she took it skateboarding - with a predicable outcome.

After removing the crushed screen protector and finding there wasn't actually any further damage to the screen other than the original crack in the corner, I proceeded to dig in to evaluate the issue. She brought it to me because every time she turns it on, it displays the Apple logo for a minute or so then goes black only to repeat the scenario ad infinitum.

So I opened up the phone and tried every combination and permutation of plugging and unplugging all of the connectors on the motherboard to no effect; nothing I tried made any difference.

Finally I plugged it into a computer and managed to get it into DFU mode. It told me the phone couldn't be updated and had to be restored, so I said fine, go ahead and restore it.

No luck there; it quit with error 4013. I did have a replacement screen that I was holding onto for the inevitable time when the screen took more damage and truly needed replacement, so I went ahead and plugged the replacement screen in and tried the update again with the same results.

Now it no longer boot loops, but comes up in DFU mode every time.

I'm forced to conclude there's probably damage to the logic board and would like some help in determining what my next step should be. I have a certain amount of equipment such as a multimeter, soldering iron, heat gun, etc., at home but I can always go into work and use the professional grade equipment there like microscopes and hot air stations if need be.

At this point I'm considering the possibility of attempting to reflow the audio IC as demonstrated in this guide that actually describes the situation pretty well.

How to fix an iPhone 7 stuck / hanging on a logo - iFixit Repair Guide

However, are there diagnostic steps that I should try first? Things like diode checks? If so, what should I check, and what would I be looking for?

I've worked with circuit boards for about 40 years now and the delicate nature of iPhone logic boards will be a first for me, but I have no problem diving in and giving it my best shot.

I'm tagging @flannelist as the closest to an expert in this area that I'm aware of, but would welcome anyone else who has expertise in this area that's willing to help out.

Update 5/6/2023

Tried connecting with 3uTools. When flashing it gets to 19% after the "Sending KernelCache" part, changes to "Restoring", then fails with "ERROR: Device failed to enter restore mode."

Interestingly, when I click on the "Exit Recovery Mode" button on the Device page, it actually does exit DFU and goes back to its reboot cycle. Afterwards I put it back in DFU mode and it stays there.

⟐ Commented 七月 23, 2026 at 4:19 GMT-7

This dint do anything, the phone merely vibrates when plugging it in normal mode. iTunes dosent detect the phone as well.

This gave me some hope. iTunes detected that the phone was in recovery mode. How ever I got the “There is a problem with the iPhone “iPhone” that requires it to be updated or restored”. So I decided that the phone’s OS needs to be updated to 12.3.1. So i update it and the phone finishes the update and goes into normal mode. The phone is still locked. I thought maybe the update had failed so I tried it again. No luck, same error.

Now I am here with 3UTools, not sure what to do. Is there something I can do in DFU mode ? This seems like a really trivial thing, and there has to be a simple solution to this without a factory reset and wiping the data. Any help is appreciated.

I am willing to go to all lengths to preserve the data. I don’t mind opening up the phone and maybe doing something with the hardware (i.e. battery reset if there is such a thing). I have the iFixit toolkit and have repaired an iPad before so that should not be a problem.

I read what @benjamen50 had mentioned here : iPhone is disabled, connect to itunes.

I followed the exact same steps he mentioned. I tried flashing 12.3.1 version firmware onto the phone from recovery mode. So once the flash was completed, it booted up into normal mode and showed me the same screen. Is this normal or should it go back to Recovery Mode ?

⟐ Commented 六月 13, 2026 at 2:58 GMT-7

Basically, I've ported my number from another phone provider. I received their sim card and it doesn't make or receive calls (data and text are OK), and the reception is quite sketchy.

But here's the weird part: when I test the new sim in another phone - the sim can make calls fine, so the sim works. Then, when I try another sim in my phone, that sim can make calls. So the phone works OK...

For whatever reason, this specific phone providers sim in this specific phone can't make calls, and has trouble finding reception.

I've called apple, the phone hardware got a green light after a diagnostic. I've reset network settings, reset the entire phone, I've bought a brand new replacement sim, the phone isn't locked - all leaves me with the same issue.

I'm wondering whether something when wrong in the porting process, or something on my phone isn't written correctly as it relates to this specific provider. My provider is looking into it now

Appreciate any help as I'm all out of normal troubleshooting options.

⟐ Commented 五月 29, 2026 at 15:39 GMT-7

⟐ Commented 五月 14, 2026 at 7:11 GMT-7

The story is I got this from a friend who has no access to it he says it’s fully functioning and wiped it’s just he cannot access it due to lack of proof that he purchased it he heard about me and how I fix old phones and tablets and says if I fix it I can keep it as he already has the 12 so I’m asking here for help

(I added this for information I told apple what I told you they like aways said that it’s unfixable and it’s better off I dump it and get a new one)

Thanks for the help appreciated

⟐ Commented 五月 06, 2026 at 6:09 GMT-7

I was simply replacing the battery on it, but eventually it won’t charge. There is certainly no issue with the cable (cause I’ve tried many) or the battery.

What’s interesting though is that when it is turned off and plugged in it turns itself on, like it should, but does not charge. It is also not recognized by the computer.

I have tried to connect the old battery, but it acts in the same way.

One thing that I’m afraid might have cause the problem: when connecting the display I accidentally plugged the battery before the display connector, realized my mistake, unplugged it, plugged the display and then the battery. Turned the phone on. Everything is working except it does not charge when plugged it in.

Will be grateful for any advice or information about the issue!

Michael

⟐ Answered 五月 03, 2026 at 9:36 GMT-7

I have iphone 7 (A1660) with (NO service) problem , I tryed use ipcc files but carrier still Not Available, so I update to IOS 12 and now I stuck with activate issue(there is still no service,Even with use different sim cared), it saying Unable to Activate An update is required to activate your iphone. image below

I Noted when I eject the tray of sim cared, my phone do’s not say (No SIM card inserted ).

pleas help me!

Thank you before!!

Ibrahim

⟐ Answered 三月 31, 2026 at 22:48 GMT-7

I have a iPhone 7 that's dead. Drawing 0.0 when connecting charger. Connecting to battery it's Stuck at 0.18a after pressing power button.

The board looking like a big rainbow.

Any idea how to continue?

⟐ Answered 三月 13, 2026 at 14:04 GMT-7

⟐ Commented 三月 13, 2026 at 5:32 GMT-7

⟐ Answered 二月 20, 2026 at 4:10 GMT-7

⟐ Answered 二月 12, 2026 at 18:17 GMT-7

⟐ Commented 一月 18, 2026 at 18:50 GMT-7

⟐ Commented 十二月 31, 2025 at 9:14 GMT-7

The battery swap went well. I followed iFixit’s instruction very closely and cautiously. Three hours later yesterday morning, the phone worked. No screws lost or mis-inserted, no ribbons damaged…all went smooth. The phone worked so I charged the battery to 100% for the 1^st step of recalibration. The health monitor said the battery capacity was where it should be with a new battery.

I then ran down the battery to 0% yesterday afternoon (2^nd recalibration step). Again, all appeared fine and all apps worked. I then plugged the phone back in for the 3^rd recalibration step. At some point, I got (what I think is called the) Black Screen of Death. I then unplugged the phone, hit the Vol down and Side button, and the phone came back on, no problems. Content, I then let it charge all night to 100%.

Awoke this morning and the phone was good. I unplugged it, the battery was still at 100% and it was that way for a good chunk of time. Family was gathering in the living room, so I started Bluetooth for some music. The music worked, so I left to get the dogs out.

I came back after that 1 min absence to find the phone dead. And it is still dead. There is no power, even when plugged into an outlet. No home button works. I can’t get it to work on the iTunes on my computer. It is effectively dead.

After several searches online and through this forum, I reseated the new battery and tried to charge it. I even reseated the old battery and tried to charge it, but no luck. I also reseated all of the internal ribbon cables that I moved for the initial battery replacement. Nothing is working.

Any suggestions for what I might consider next? And thanks!

⟐ Commented 十二月 26, 2025 at 14:46 GMT-7

⟐ Commented 十二月 20, 2025 at 10:45 GMT-7

⟐ Answer accepted 十二月 15, 2025 at 21:32 GMT-7

⟐ Answered 十二月 10, 2025 at 13:28 GMT-7

So I deleted my finger prints, and then added new ones on. It worked for an hour or so and now It just doesn't take anymore. It's denying my fingerprint either, It just does nothing.

⟐ Commented 十一月 23, 2025 at 12:30 GMT-7