Chosen Solution
So my iPhone 7 is not turning on anymore. It draws 0 amps when i connect the charger and when I press the Power Button its just sutck in a Boot Loop (it shows the Apple Logo, gets a little bit brighter and then turns off and repeat this behavior). I tested a known-good battery - same result thoguh. I am suspecting something board-level but I dont know if it is related to the Tristar-IC or Audio IC (because a symptom of a bad Audio IC is boot loop if I’m not mistaken). Can anybody help me identifying the problem?
Audio IC gives a pretty long boot loop, it takes a while for it to turn off and on again when stuck on apple logo. Tristar can cause quick boot looping though a lot of boot loops can be fixed by updating / restoring the phone.
