How do I change the Sleep Timer setting?

See below.

Changing the Sleep Timer Settings

You can adjust the time period before your product enters sleep mode and turns off the LCD screen.
1. Press the  home button, if necessary.
2. Select Settings. You see a screen like this:
   
   
3. Select Basic Settings.
4. Select Sleep Timer.
5. Select a time period between 3minutes and 15minutes.