LeEco Super4 X Series 4K UHD Ecotvs - Manual (Page 17)

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Display
By default, your TV is set to Energy Saving Mode. To
adjust, press the Settings button on your remote, and
navigate to:
Picture > Display Mode
Advanced display options, such as brightness, color
and clarity, can be found by navigating from the
home screen to:
Settings > Picture > Mode settings
Sound
Sound options, such as custom gaming presets, can
be found by navigating from the home screen to:
Settings > Sound