iFixit - Answers With Device "iPhone 12"

iPhone 12: My phone goes into a bootloop anytime it's plugged in

Wed, 01 Apr 2026 11:12:41 -0700

Title says it all, anytime I plug a lightning port into my phone (connected to a charger or not), the phone freezes, then restarts, shows the apple logo, then black screens over and over, and if it's still plugged in, eventually it leads to the recovery screen, before restarting the boot-loop shortly after ; on top of that, unless I have airpods / a bluetooth sound device connected to my phone, videos do not play and there's no sound or haptics from the phone.

To try and diagnose the issue, I tried pretty much everything, replacing the lightning connector altogether, the loudspeaker, the taptic engine, even the light sensor on the screen but no dice, the issue still happens and I don't know what to do

The issue popped out of nowhere too, it worked one day, went to bed and it stopped working the next.

Other than that, the phone works fine, but trying to look at the panic logs didn't provide anything of use either

Lemme know if you have any solutions to this!

here, idk if that’ll help

⟐ Edited by author April 01, 2026 at 11:12 MST

iPhone 12: Mix and match iPhone battery

Mon, 23 Feb 2026 21:23:38 -0700

I have an iPhone 12 which still has 100% maximum capacity. I was just curious if I could put an iPhone 11’s 3110 mAh battery, or an iPhone 11 Pro’s 3046 mAh battery, or and iPhone 13’s 3227 mAh battery, or an iPhone 13 Pro’s 3095 mAh battery, or any other battery (from this list: https://www.knowyourmobile.com/user-guid... ) that would potentially increase my Phone’s battery life?

⟐ Commented February 23, 2026 at 21:23 MST

iPhone 12: How do I create a speaker using the speakers from the iPhone 12?

Mon, 16 Feb 2026 23:05:47 -0700

Hello!

I know this seems like a strange request, here's a bit of background so you can understand what I'm hoping to do:

I'm a mastering engineer, the last creative step in the music production process. To over-simplify my work, I take a stereo mix of a song and bring it up to competitive loudness while adding subtle enhancements and/or corrections to the mix in order to achieve optimal translation across all playback mediums.

I want to create a stereo speaker device with iPhone 12 speakers that I can plug into a 1/4" jack, where I'd normally plug in headphones, that I can use to check how the mastered song sounds coming off of phone speakers, as those are often tricky to master for because of their limited frequency response.

I figured the iPhone 12 would be a perfect baseline since it's modern enough to sound good/decent but not too advanced that it wouldn't beat any newer phone models coming out these days. Thus, if my mastered song sounds good coming out of the iPhone 12 stereo speaker device, it'll probably sound good/translate well to any other mobile phone speakers.

I understand I need to buy the iPhone12 loudspeaker and earpiece speaker to get the L/R channels/stereo playback and that they usually use a flex cable connect for audio+power via the logicboard of the phone, but I'd love any advice I can get on how I can connect+power them into a simple speaker that just functions off a simple stereo 1/8" or 1/4" aux input connection.

Thanks in advance for any help!

-Sam

⟐ Answer edited February 16, 2026 at 23:05 MST

iPhone 12: My iPhone 12 is not turning on but apple logo and is chargeing

Sat, 07 Feb 2026 21:58:37 -0700

my iphone 12 will not turn on and on apple logo

⟐ Answered February 07, 2026 at 21:58 MST

iPhone 12: What is the name of this part and should I get it replaced?

Wed, 04 Feb 2026 10:49:22 -0700

I'm not sure what this part of the iPhone 12 is called or how important it is. I'd like to know what it is, if it's important and if I should get it replaced. It's located below the taptic engine. The upper image shows the part that is broken. Half of it has broken off. I have no idea how important it is.

⟐ Answered February 04, 2026 at 10:49 MST

iPhone 12: iPhone 12 battery at 1% / not charging after replacement, old works

Fri, 30 Jan 2026 10:09:11 -0700

I'm trying to replace the battery on my iphone 12. The original battery works fine but had been used heavily and wasn't lasting as long as it used to.

I installed the replacement battery (from ifixit), but the phone shows up as 1% and there is no "lightning bolt" charge icon when the phone is plugged in. The battery menu in settings shows the phone as charging during periods when I leave it plugged in though. The phone locks and reboots periodically while plugged in, and 0% remaining" is displayed on the lock screen.

I saw other threads online with similar symptoms from different model iphones that indicated that I might have damaged surrounding components or circuitry. I took me a bit to get the new battery connector installed, but I did not see any loose pieces or visible connector damage on the phone.

I decided to test this by disconnecting the new battery and reconnecting the old battery. If the circuitry was damaged, I would expect both batteries to fail, however the old battery reports percentage, charges and the phone seems to operate fine when its installed.

I've tried reconnecting the two different batteries several times, and have tested with the screen on and off to try and rule out shorts as a possible cause.

The ifixit battery shows 3.78V on a multimeter when measured at the connector, while the original battery shows 3.8V (battery is rated at 3.83V). I inspected the connector on the new battery and can't see any obvious damage.

Any ideas on possible causes?
Next steps to debug?
Is it possible that there is an issue with the new battery?

⟐ Answered January 30, 2026 at 10:09 MST

iPhone 12: iPhone 12 buttons replacement guide

Wed, 28 Jan 2026 10:32:12 -0700

Hi everyone

I replaced the buttons with new ones, there are no gaps, everything is fine, but I'm lost, I can't understand how long the screws are needed…

Everything is fine, but when I tighten the screw to the end, the button is not pressed, although everything is in place

Could you please tell me if I need to buy these screws separately? And are they sold on AliExpress? What length of screws for buttons do I need?

⟐ Commented January 28, 2026 at 10:32 MST

iPhone 12: iPhone12 not turning on

Thu, 15 Jan 2026 11:35:40 -0700

My iphone12 is not turning on. Fistly i found out that when in room temperature my iphone sometimes just turns off and not turning back on, but it turns back on after using a air blower to heat the phone up. Then i found out when i go into my camera the iphone just stuck and have to force shut down but then not turning back on.

iPhone 12: I can't activate Face ID after my screen broke.

Tue, 30 Dec 2025 18:08:04 -0700

So I broke my iPhone screen, and the front camera bezel got damaged. What do I do?

⟐ Answered December 30, 2025 at 18:08 MST

iPhone 12: Issue: Face ID is not available try again later

Tue, 30 Dec 2025 00:28:36 -0700

Hello,

I have an issue with repairing my iPhone 12 and I'm stuck at the moment.

I refurbished the display as a hobby, but now I'm getting a "Face ID not available" message when I try to configure Face ID by going to Settings > Face ID & Passcode > Configure Face ID and then tapping on "Get Started". It briefly appears as if it's working, but before the scan begins, the message pops up. In General > About, I'm also alerted to the Face ID issue.

I have restored True Tone and auto brightness is functioning as well.

I have already cleaned all the sensors with alcohol once, and I've also tried setting up Face ID without closing the display, ruling out any contamination on the display as the cause. In Portrait mode, the Natural Light option is grayed out and not highlighted in yellow.

For the repair, I have i2C i6s and an SK Box. I'm not proficient in micro soldering yet, but if that's the only way to fix the issue, I'm still interested in knowing what exactly needs to be soldered.

It would greatly help me if someone could help me out and let me know if I need any additional tools for this.

Thank you in advance.

⟐ Answered December 30, 2025 at 0:28 MST

iPhone 12: مشكلة عدم سماع صوت Problem with not hearing sound

Sat, 06 Dec 2025 14:41:04 -0700

مشكلة عدم سماع الصوت عند الاتصال في السماعه الداخلية

Translation Arabic - English

Problem with not hearing sound when calling on the internal speaker

⟐ Edited December 06, 2025 at 14:41 MST

iPhone 12: iPhone Camera Blurry After Removing Broken Glass

Fri, 28 Nov 2025 06:51:07 -0700

I cracked the camera glass on my iPhone, and after removing the old glass with a blow dryer and some tweezers, I noticed the camera won’t focus. Is this because I don’t have the glass cover on? I am waiting on a new one to ship right now. Also, I tried to clean the lens with a microfiber cloth and isopropyl alcohol, but that didn’t seem to help.

⟐ Commented November 28, 2025 at 6:51 MST

iPhone 12: Why is the sound low

Thu, 13 Nov 2025 00:22:38 -0700

Why is the sound on my phone low

⟐ Answered November 13, 2025 at 0:22 MST

iPhone 12: iPhone running hotter after battery replacement

Mon, 10 Nov 2025 09:47:32 -0700

My daughter is reporting that her iPhone 12 is feeling much warmer after I replaced the battery and screen this past weekend. She didn’t notice any issues with performance, and she does use a case- the same one she used before the repairs. Is this normal?

iPhone 12: iPhone 12 is bent and doesn't turn on

Sat, 01 Nov 2025 09:24:25 -0700

Hey everyone,

If an iPhone is Bent and doesn't turn on/ doesn't connect to computer, chances are high, that the motherboard is damaged, am i right? what do you think?

⟐ Commented November 01, 2025 at 9:24 MST

iPhone 12: Top of screen not working

Sat, 25 Oct 2025 08:43:05 -0700

Hey everyone,

After a fall the top of my iPhone 12 screen isn’t working anymore. It’s about 3 cm that aren’t working anymore. I tried restarting, updating, completely resetting the phone but nothing works.

I now believe it’s a hardware failure. Is there any way to fix this without having to replace the whole screen? Btw my screen isn’t cracked at all as I had a screen protector on it (which I have now removed)

Thanks for your help!

iPhone 12: iPhone 12 A2403 screen problem

Sun, 19 Oct 2025 13:14:06 -0700

Hello !

Quick question, I just changed my iPhone’s battery (not the first time I’ve changed a phones battery) but when I finally finished the operation, part of the screen is bright green… (see pic)

Does someone know if I damaged something ? Or misconnected back something ?

Everything seemed well during the operation… the phone is working well (new battery perfect and the touchscreen works)

Best regards

Piero

⟐ Commented October 19, 2025 at 13:14 MST

iPhone 12: Screen dead after dropped - screen flickers when a call comes in.

Fri, 10 Oct 2025 06:41:51 -0700

Greetings,

The phone was dropped and now the screen is non-responsive. It has been hard reset to see if that would get it back. I'm not for sure if the right steps were done for a hard reset, as I don't have the phone. If it did work, the screen isn't working.

I've looked at ordering a kit to repair, but see three options that I don't see quite an explaination of.

In-Cell LCD
Hard OLED
Soft OLED

Even though I could fix this phone myself, I'll have to determine if the price difference on Swappa.com verses having this one fixed is worth it.

Any input on the different options would be appreciated and any pros/cons on fixing verses buy a used one off Swappa.com

Thanks!

iPhone 12: Why when I scrolling on tiktok it suddenly my screen doesn't touch

Tue, 30 Sep 2025 00:20:35 -0700

My screen doesn't touch and suddenly turning off when i scroll on tiktok

⟐ Answered September 30, 2025 at 0:20 MST

iPhone 12: PH #00 or JCIS #00 Scews

Mon, 29 Sep 2025 18:55:46 -0700

To begin this is mainly about the screws that need to removed in order to change out the camera but it does apply across the board.

In iFixIt guides they call for the 00 Philips screw driver but in Apple's own self service guides and tool purchases/rentals it says JCIS bit. I know the differences between PH and JCIS is very minimal but it still seems somewhat important to know the difference.

So basically, regardless of how much it may or may not matter, which is the actual 100% correct tool? Does apple use JCIS screws instead of Philips or???

Thank you.

⟐ Commented September 29, 2025 at 18:55 MST