My girl friend's iphone 5s has this issue her iPhone 5S won't trun on. we replaced the battery. On occasion, if she left it on the charger too long, it would not turn on. Disconnecting the battery and reconnecting fixed it so we thought it was a bad battery. Replaced the battery and it worked fine for about a week. She left it on the charger again and now it's dead. Replaced the battery with the other 'newish' battery and the original battery and get nothing. Home button, usb cable does nothing.

Any help would be appreciated.

I have a iphone 6 and the screen is blank. When I put phone on charge I don't get the vibration or any lights on the screen or sound, but battery is charging as its gets hot ! Any help would be grateful.

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This won't turn on issue of iPhone normally is software or battery related. Sometimes can be caused by moisture or water damage, which can be fixed using this guide here to remove moisture from iPhone: https://www.beijingiphonerepair.com/fix/fast-and-easy-way-to-clear-condensation-moisture-on-iphone-camera-lens/