Steps

1. Press the HOME button, then select [Settings].

2. Select [System Settings] → [General Set-up] → [Illumination LED] → the desired option.
   

Available Options

[Demo]

The lamp blinks all the time the TV power is on.

[Auto Brightness Adjust]

Optimise brightness according to the ambient light.

[Dark]

Lowers the brightness of the lamp.

[Simple Response]

The Illumination LED at the bottom of the screen lights in response to operations. It lights only as a user response, and will not continue to light as a timer indication (such as timer, timer rec* or reminder*).
* This function is available depending on your region/country.

[Off]

The lamp does not light under normal use.