Boot loop after back case replacement.
I did follow the guide to replace my iPhone 7 back case. Everything went smooth, I’m 100% sure I didn't mess with screws (everything was tagged and I also made photos after every step), but before final reassembly I decided to check if my phone works only to find out it doesn’t boot. Apple logo appears for 15 seconds, then phone switches off and on. 15 seconds later everything repeats, and phone never finish the boot.
Things I tried one at a time (and they didn’t help):
- Disconnected front camera
- Disconnected whole display assembly (it didn’t appear in iTunes).
- Disconnected back camera
- Disconnected back assembly (lightening port and audio speaker). This way it looped faster (in 7 seconds instead of 15)
- Disconnected power button assembly
- Connected new front camera assembly
I also tried to put iPhone in DFU mode in restore firmware. It succeeded both times, firmware check also succeeded, but iPhone still doesn’t boot. The only thing different is that it loops in 7 seconds instead of 15 like before.
I’m really stuck and don’t understand what I can check at this point. It doesn’t look like Audio IC or modem issue other users are having here, also it shouldn’t be front camera assembly, as I tried to boot without it (and boot with a new assembly) and it doesn’t work too.
UPDATE:
Could someone confirm that iPhone 7 with latest iOS 12 should boot WITHOUT front facing cam ribbon and Touch ID? I know that was an issue on iOS 11 and I’m trying to understand if I have a logic board or display ribbon cables issue.
Bu iyi bir soru mu?
2 Yorum
Have you checked that all the correct screws are in the right spot? Some of the screws around the logic board are different lengths and can cause the logic board to reboot, just like a motherboard on a PC if the standoffs aren't installed correctly. If I recall correctly the difference in screw sizes are 1.4mm and 2.2mm, so even if you documented everything there is a chance you could have switched one or two up on accident. The good news is: You definitely did not break it since it turns on which is good.
Cameron tarafından
Well, from what I can see there are just 5 screws which keep the logic board: 4 2.2m standoff screws and one smaller screw which goes under the camera ribbon. I'm not sure what can be mixed here. I'm not putting any ribbon protectors yet, so that's all I used.
Andrey Valentsov tarafından