BlackBerry: How to Set the Backlight Timeout
Contributed by Rob Rogers 
Tagged: Blackberry If the backlight on your device is not on long enough (or is on too long) for your liking, you can easily change the duration for easier usability or longer battery life.
1. Go to the Home Screen on your Device.
2. Press the menu key to show all your applications.
3. Select Options.
4. Scroll down the list and select Screen/Keyboard.
5. Select the Backlight Timeout option and choose the desired duration (10 Sec, 20 Sec, 30 Sec, 45 Sec, 1 Min, 90 Sec, or 2 Min).
6. Press the menu key and select Save.
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melissa said on May 31, 2009
mine never goes off.. and if i put it on standbymode it comes back up after 4 minutes.. how can i keep the screen on standby or blank to save the battery life?
Anonymous said on December 15, 2009
Thinks it’s useful to me!
http://www.sidekickhiptop.com
Tim said on March 17, 2010
You can use a app to keep it on for longer. I use screenlight
http://appworld.blackberry.com/webstore/content/6808
to keep it on when I’m using the map.
Tim said on March 20, 2010
If you get the screenlight app from the blackberry app world you can quickly toggle on/off the backlight as long as you need it with one click
http://appworld.blackberry.com/webstore/content/6808
Melissa said on July 17, 2010
Thats fantastic app Tim!