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Why my ip 5s phone draining battery so fast even known good battery i think something shorted out the phone charges battery well but something strange when its turned off ,its not automatically boot when connected to charger i should push power button 1st then it detect the charge. Is it u2 defect symptom?
Has anything happened to the phone recently, such as a drop, repair attempt or water damage? Battery drain can be caused by a defective battery, broken charge circuit or defective peripheral (screen, camera, sensor, flex etc.) . Depending on the history of the device, it could be anyone of those causes. If you have tried a known-good battery, then try a known good screen to see if that helps. If not, progressively remove peripherals until the problem is identified. Eventually, you may have only the logic board left which would point to a logic board issue.
