Primarily of importance for CCFL backlit (i.e. Backlight-on time: this is a count of how long the screen is actually lit up with the backlight.Inside the service menu, you might find several handy things (or none at all, depending on monitor): Access to this menu is by (sometimes) undocumented means involving combinations of unlikely inputs to the buttons. This is also known as a factory menu which is strictly “for technicians only”. What you don’t normally see is the service menu. They’re in charge of sleep, wakeup and controlling backlight brightnesses. They also digitize VGA (analog) inputs, and often talk multiple digital inputs too (say DVI and DisplayPort). For one thing, they generate the on-screen overlay displays which you set your settings with, and they do scaling of different resolutions to your panel (except for those bottom end Yamakasi monitors sans scaler). I’m not sure many people know, but the chips inside LCD monitors are actually fairly smart.
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