I have an iPhone 7. I had the battery replaced approx 6 months ago.
I've noticed the battery life hasn't been overly great considering it's a new battery.
Yesterday, my phone started turning off at random. Today, it turned off and never turned back on.
When the phone is plugged into the AC charger, it gets stuck in a boot loop on the Apple logo. But, when it isn't plugged in, I get no power.
I've taken the battery out, and the exact same thing happens. It boots to a boot loop on AC power, and no power when unplugged, as expected. It's as if it won't run off its own battery source.
Does this sound like a faulty battery or something more significant like the IC board?
I cannot boot into restore mode or off a USB port.