Chosen Solution
Woke up at 5am today to my phone stuck on the apple logo. Tried updating through iTunes to no avail and had to restore. Restore was successful and I restored a back up, while downloading spotify it froze and turned off. It bootlooped slowly around 7 times and now it’s just solidly on the apple logo. Phone also gets warm to the touch. Battery is 100% not the issue. Phone is also fully charged. Any suggestions help, thanks.
Did anything happen to the device in the days and weeks leading up to this issue, such as a drop, a repair attempt or contact with water? Assuming this was a spontaneous failure, it is probably a failed component on the logic board. The iPhone 7 is prone to several issues after repeated minor drops and flexing over the course of its life. It could also be a dead or dying battery or modular component. If you have access to a multimeter, you could measure the battery first. If it reads ~3.8V - 4.2V, then it is good. I would start by testing a bare-bones setup. Start by disconnecting the battery first (always!). Then disconnect the digitizer, LCD, front camera, rear camera and home button extension flex. Now re-connect the battery; you should only have the battery and Lightning Dock flex connected. Connect a known-good, preferably Apple-original Lightning cable to an iTunes enabled computer. Does iTunes recognize your phone? If so, then you should re-connect one flex at a time until the phone stops working. I would start with the Home button flex first, then add the rear camera, LCD & Digitizer then from camera flex. If the bare-bones setup does not get recognized by iTunes, then you most likely have a logic board issue. You could send it (or find a local) to a repair shop that specializes in micro-soldering repair. Sometimes the fix can be straightforward (i.e. a blown filter) and relatively economical.
