Hold the illuminate/light button down for 2-3 seconds until the watch beeps. The same thing turns it off.
Hold down the split-reset button down for 5 seconds.
Go to the sttings menu and select backlight then select off.
I think its broken
Turn off Wifi Set display backlight and brightness level to low
Gshock monsters stole it, they stole 5 of mine throw some salt over both shoulders and dance around until u can't walk any longer ur gshock will then end up on ur over if u have an electric oven you may have 2 turn it on for this to work good luck :)
There is NO back-lit keyboard available for the Dell 15r-5537 laptop!
Either wait one minute after the backlight goes out and it will turn off automatically, or press and hold the play/pause button for 3-5 seconds.
If referring to the screen backlight, there is an option to modify how long it stays active. To access this setting, tap Settings. Then, tap General followed by Auto-Lock. The default time is 1 minute to save battery life but it can be adjusted up to 5 minutes. If you don't want the backlight to turn off at all, select Never. Note: The more time for screen to lit you choose more it will affect talk, standby, and data times.
To turn off your autoreply, type !AUTOREPLY
Hold down the 'Mode' button, it will cycle through the lighting options, stop pressing the mode button when the lighting option you want is active.
The best way to make a Galaxy S2 battery last longer is to stop notifications from games, turn the backlight off after a few seconds and turn the phone off when not in use.
set your phone in less backlight; turn off the vibration mode, lower the level of your ring tone / turn it off; lessen the time of the display/standby mode.