Samsung Galaxy S4 User Manual page 26

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Warning! While the device is charging, if the touch screen does not

function due to an unstable power supply unplug the USB

power adapter from the power outlet or unplug the USB

cable from the device.

Note: This illustration displays both the correct and incorrect

orientation for connecting the charger. If the charger is

incorrectly connected, damage to the accessory port will occur

therefore voiding the phone's warranty.

5. When charging is finished, first unplug the charger's power

plug from the AC wall outlet, then disconnect the charger's

connector from the phone.