Chosen Solution
I just replaced a crushed screen. It was so bad I could not power off and of course now it will not power on….. any ideas?
With a ‘‘‘USB mini voltmeter’’’ you can measure the power being sent to your device. Plug the voltmeter into a powered USB portPlug your lightning cable into the voltmeterConnect the lightning cable to your iPhonePower on your iPhone & watch the voltmeter You’re looking for a consistent amperage (red number) between 0.9-1.0A being sent to the device during boot, and while it is running. If this number dips frequently or stays low, you are not just dealing with a display issue. It could very well be a charging port and/or battery issue. Another thing you can test is the voltage on your battery using a multimeter. If it reads below 3.82V it means that it is not charged, or has failed in some way. By ruling out a potentially bad chargeport first, we can conclude after this measurement whether it is a battery issue or something else.
