The sensors on the TV don't work and remote control operations or brightness adjustments can't be performed.
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There is a remote control light receiving sensor and an ambient light sensor near the center bottom of the TV screen. Placing something in front of the TV, such as a sound bar, can block the sensors and prevent them from working properly. Move the obstacle away from the TV until the sensors operate normally.
Note: Check the TV instruction manual for information regarding the locations of the sensors.