You want to disable the LED so that it does not light up or blink.
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To turn off the Operational response LED (amber LED)/voice function LED (amber LED) (only TVs with a built-in MIC)
To turn off the amber voice function LED when the Built-in MIC switch is turned off, or to turn off the amber operational response LED when the Built-in MIC switch is on, in [Settings] — [System] — [LED indicator], disable [Voice detection status].