Chosen Solution
Phone likely had some water damage about a year ago as the face id system stopped working. no other issues noted at that time. a week ago the phone would randomly start going into a repeated boot cycle. phone would go into recovery mode but not DFU. was able to backup and restore which temporarily fixed issue. yesterday it went into a boot cycle again so I tried flushing the board with iso alcohol and allowed it to dry. today the phone will not power on. what would be the logical steps to trouble shoot internal components? I have a multimeter and a soldering iron. thats about it. thank you!
Press and hold both the “Power” and “Volume Down” buttons. Do this for about 20 seconds or until the device restarts again. This will often clear the memory, and cause the device to start normally. Regards, Will
I’m half asleep so I’m going to give the cop out answer for this, but I will try to write a more complete answer in the morning. I would have a look at the iPhone Keeps Restarting page and see if anything there is helpful. If you determine it’s a board problem we’ll see where to go from there.
