Chosen Solution
I have a iPad mini 2 here not charging. It turns on everything but it does not charge. Changed the battery, charging port, and charging ic. All of the parts work cause I tested each part on another working device. When I plug in the charger and turn on the device, it shows it’s charging but it’s fake charging. When I unplug it and plug it back in, it does not charge again. I have noticed how the voltage drops when athe battery is connected to the device. When a cable is connected to the port, L5700 shows 5v. With battery drops to 4v and when the device is turned on, its 3v, despite the charger plugged in.
PPVBUS_USB (L5700) should not be dropping down to 3V when charging (or even 4V for that matter). To things could be going on here: The power source (charging brick or USB port) can’t supply the necessary current and is being current limited , hence dropping the voltage.The power source is fine but the device is drawing excessive current due to a short or partial short somewhere. If you have access to a USB Ammeter, you could use that to determine if the device is really drawing current when it says it’s charging.
