How do I turn off the TV completely?
Press and hold the Power (⏻) button on the remote control, or press the TV Controller button at the bottom of the TV. If you use a remote control other than the Samsung Smart Remote, the TV may not turn off completely. To ensure the TV is completely off and decrease power consumption, you can unplug the power cord when you don't intend to use the TV for a long time.
From the official Samsung LS03 Series TV manual, page 11
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