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The red light on the LG 43” Class UA77 Series LED AI 4K UHD Smart webOS TV (2025), Model # 43UA7700PUB is a 'Standby' light. When a TV is plugged in but not turned on, it typically enters standby mode, allowing it to consume less energy while still being responsive to remote controls. This means that while the TV is not fully powered down, it can be quickly awakened by pressing the power button. Check the settings menu on the TV to see if there is a Standby LIght setting that turns it off. Turn on the TV and press the [Settings] button on your TV remote. Select [All Settings] in the [Settings] menu. Select [General] and then [System]. Select [Additional Settings]. Select [Standby Light] to toggle it on or off...^Ivan.
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