Chosen Solution
Hi, I have an iPhone 6S that died suddenly and won’t turn on anymore. No apple logo, no battery dead symbol when plugged in to wall or computer. Also, I tried opening up the phone and disconnecting the battery and then plugging into a computer or wall charger, but there is no battery dead symbol either: https://support.apple.com/library/conten… Then I tried replacing the battery. With the new battery, the apple logo appeared, and the phone was in a boot loop. I tried multiple combination of button presses, but the only thing that worked was to get the iPhone to the recovery screen (linked below): https://support.apple.com/en-us/HT203122 But iTunes would not recognize the connected device. Then eventually the new battery died (I am guessing) and I am back to square one. The iPhone won’t turn on anymore. No apple logo, no battery dead symbol when plugged in to the wall charger or computer. Any guidance will be highly appreciated, thank you in advance.
Sounds like Tristar failure which is an IC on the motherboard. Normally caused by bad charger or faulty cables. You will need to take it to someone who does motherboard Repairs/ micro soldering.
