Chosen Solution

I have an IPhone 7 stuck in boot loop after screen replacement. I already tried to restore, didn’t work. Tested battery and the screen on a different phone and it works fine. The only way I am able to boot up the by disconnecting the screen assembly completely and iTunes will recognize the phone and it seem to work fine. How would you fix this issue?

Try a new proximity sensor. I believe this can sometimes cause issues.

I have found that the proximity sensor is the issue most of the time, if you start the phone but disconnect the top cable to the camera it will boot just fine. Apparently the glass where the camera is looking through is causing some sort of false signal.

Make sure you connected the camera cable right. Ill plugged it the wrong way.

The main culprits for a boot loop on iPhone 7 after a screen replacement would normally be a damaged home button (or home button flex cable), (will eventually come on after 5-10 mins) or damaged front camera flex. If your really unlucky then it’s possibly an ic as they are a known problem from dropping a iPhone 7.

Often times when replacing a component in an iPhone, the user may install the screws in the wrong place. Since they are of different length, it may cause a short somewhere inside of the device. Make sure no metal pieces are where they shouldn’t be, and try again. You can also try to boot the device temporarily without any of the screws you unscrewed to see if that is the issue.

This is being called “Loop Disease”, and it is related to the Audio ic or the Baseband PMU. The solder joints beneath these IC’s are in a weak spot and will actually crack and/or separate from the board. Once this disconnects, the device cannot receive the data it needs upon boot up to actually boot fully. We have been repairing this issues like crazy at my shop here in the St. Louis area.

I replaced my first iPhone 7 screen and although it tested OK straight from the box when I came to the full install it was very slow to boot and then went into boot loop. The Apple symbol showed for about 10secs and then seemed to die but came on again repeatedly. I disassembled, including disconnecting the Home button, reconnected the digit and LCD flexes and again it tested fine. Reassembled everything but this time I more carefully reseated the Home button and this time all worked 100%.

Here is my answer and this may help. If you tried a new cam, and it still boots to logo then shuts off then does it over and over.. try another screen. Some screens are cheaply made and won’t register with the boot up process and will fail causing the boot loop. Try putting the old screen on and seeing if it’ll boot. If it does, your screen is bad and should be replaced with a higher quality display. I had one come in from a shop same issue and it ended up being a cheap quality replacement screen causing the boot loop.

be careful in installing the charging connector, try comparing the charging connector to the normal pcb. usually a bad installation can cause the connector to bend and stop at the apple logo. replace the connectors, and install them carefully. the problem must be solved. send me a gift on my birthday … hahaha

iron protective connector must be installed so that it gets pressure

Try to restore on iTunes.

I just have run into the same thing after changing the screen and battery after a week. Cannot fix it. Please keep us updated. Thank you,

It could be a faulty component, try disconnecting the camera.

I had this problem and was racking my brain for the last two months trying to think of what the problem could be; I finally figured it out yesterday when trying the screen on a different 7 (I was testing the other board to see if it was good) and it was in a bootloop as well. I decided to disconnect the camera and try it again; this time IT WORKED.

I connected it back to the original phone (without plugging in the camera), restored it and it worked as well.

Maybe you’ll get lucky and it will be something as simple and fixable as that, but it could also be any component on the board or on the screen assembly causing it.

Good Luck!

Boot loop or taking forever to boot after a screen replacement on iPhone 7 or newer can be caused by a defective or incorrectly installed proximity sensor. If the screen came with prox you can remove it and install with the one from the defective screen or send the screen back.

I had this boot loop issue, it turned out to be the battery connector not properly seated.

HELP!!! i manage to pass the boot stage making it to passcode screen if and it manage to run for at most 1 hour and 30 minutes top then it completely cuts off and bott loop for another measure of time before reaching the passcode screen should i downgrade the firmware of the phone to resolve the problem

I had an issue with my screen, and apparently seems that’s causing the bootloop. I discovered yesterday that If I press the screen with a little force, the bootloop temporarily disappears and boots normally. The battery is another issue which I can’t understand, according to apple settings it said that my battery health is 62%, however if I disconnect it from the charger, it immediately turns off. What can be causing this issue? battery? screen ?

Remove front camera flex and home button flex and try.

Bad camera is known to cause a boot loop. Actually a good check is to use an infrared thermometer to look for hot spots near the top of the screen where the camera sits, if it or the screen controller is damaged then this will show up.