ECS O40 Series, Manual

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The LCD screen display can be adjusted by the following key
combinations.
Fn + F4 Changes Display Mode: LCD-only, CRT/HDMI-only and
simultaneous LCD&CRT/HDMI.
Fn + F7 Increase the brightness level.
Fn + F8 Decreases the brightness level.
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LCD screens are delicate devices that need careful handling.
Please pay attention to the following precautions:
When you are not using the computer, keep the LCD screen
closed to protect it from dust.
If you need to clean your LCD screen, use a soft tissue to gently
wipe the LCD surface.
Do not put your fingers or sharp objects directly on the surface and
never spray cleaner directly onto the display.
Do not press on, or store any objects on the cover when it is closed.
Doing so may cause the LCD to break.
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You can hook up an external monitor through the 15-pin CRT
connector.
LCD only
CRT/HDMI only
Simultaneous LCD&CRT/HDMI