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Annoncé le 13 octobre et sorti le 23 octobre, le smartphone vedette 2020 d'Apple est doté d'un écran OLED de 6,1 pouces, d'une caméra arrière à triple objectif avec LiDAR et de la 5G. Il succède à l'iPhone 11 Pro.

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Apple logo boot cycle after Screen replacement

I replaced the screen and get the apple boot logo but it keeps looping. What are my troubleshooting steps?

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Hi Brett,

First thing to do is go through and retrace your steps. Go through the whole screen replacement procedure again and in the process check all of the connectors you unplug. Get yourself a magnifying glass and a nice bright light and check the cables for any kind of tear or damage, then examine the FPC connectors on both sides (cable and logic board) for any bent or missing pins. Bent pins can sometimes be straightened with some fine tip tweezers, but broken or missing pins will require the connector to be replaced. Check around the connector on the logic board for any small components that may have gotten knocked off in the process of connecting and disconnecting those plugs.

If everything looks okay, clean all of the connectors with 90% or higher concentration isopropyl (rubbing) alcohol, let them dry and reassemble and reevaluate.

Typically the screen doesn't usually cause boot loops; usually you'll see either no display or no touch screen function. However, the earpiece speaker assembly mounted on the screen is very susceptible to damage and can cause boot loops, so you might try unplugging that connector and seeing if the phone will boot then.

Give that a try then come on back and let us know what you find and what happens and we'll try to figure out what to do next based on your results.

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Disassembled. Checked all pins, they look good as well as connectors. Cleaned with 91% Isopropyl.

Tried booting without speaker assembly. Same thing.

For more detail, if this adds any, I get a flash of grey static (like an old TV), then the apple logo for a few seconds, then black screen and repeat.

par

@xenocity Is the old screen at least semi-functional? If so, try swapping in the old one - don't worry about transferring the speaker assembly.

par

Sorry for the delay. Original screen does not function at all so I don’t have anything to test with. Any other options?

par

@xenocity Assuming your phone is backed up, you probably want to try a DFU restore. That will eliminate any possibility of corrupted software; it's the most complete restore possible on the phone.

https://help.ifixit.com/article/108-dfu-...

That article is somewhat out of date, so if the procedures described don't work on your phone you can always Google the proper sequence for your phone.

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Brett Jung sera éternellement reconnaissant.
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