LG HU715QW -GL Owner's Manual page 131

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[Projector Power Sound]
(Q. Settings) →
It notifies you by sound when the projector is turned on or off. When the digital sound
output is set to Pass Through, sound may not be output.
Changing the Menu to High-Contrast Screen
(Q. Settings) →
When this feature is set to [On], it adjusts the background of some of the menus on
the screen and font colors to highlight the contrast between the light and dark areas.
[Grayscale]
(Q. Settings) →
Change the color of the menu on the screen to black and white tone to make its
ambiguity very clear. Set to [On].
[Invert Colors]
(Q. Settings) →
To enhance the visibility of the menus on the screen, you can invert and calibrate
certain colors in some menus. Set to [On].
→ [General] → [Accessibility] → [Projector Power Sound]
→ [General] → [Accessibility] → [High Contrast]
→ [General] → [Accessibility] → [Grayscale]
→ [General] → [Accessibility] → [Invert Colors]