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Оригинальный сообщение: jessabethany ,


iPhone 7 and 7 plus boot looping most common cause in my experience is a fatal one---an internal short within the required baseband CPU---a chip that is unique to each device and cannot be replaced.  This fault is characterized by a "baseband style" boot loop that lasts 15-20 seconds.

Second most common is audio ic fault---characterized by a long boot loop lasting 3 minutes.

There are MANY other causes--bad screen, bad fcam assembly, charger damage, water damage, flash memory corruption etc.   If I had a phone with the short bootloop I'd rule out parts and look for a short circuit near BB_CPU.  If it was long boot loop I'd send it out for audio ic work.