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The TV screen goes black as the TV enters standby mode to perform panel calibration. This happens when the Picture reset mode is On when you unplug your OLED TV power cord, plug it back in, and then turn it on. The screen will go back to normal display when the calibration is complete (approximately ten minutes).
Set the Picture reset mode to Off, if you don't want to run the panel calibration:
- On the remote control, press the HOME button.
- Select Settings.
- Under System Preferences category, select Retail mode settings.
- Select Picture reset mode.
- Select Off.