Restarting the TV can often resolve software glitches. Press the power button on your TV, located usually underneath the TCL logo or on the right edge, and then unplug the TV from the power outlet.
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If adjusting settings does not resolve the issue, try resetting your TV. Go to Settings > System > Power > System restart > Restart, and then unplug your TV for 10-15 minutes before plugging it back ...