Sony Xperia PRO Help Manual page 54

Help Guide
Smartphone
Xperia PRO XQ-AQ52/XQ-AQ62
Adjusting the idle time before the screen turns off
When your device is on and left idle for a set period of time, the screen dims and turns off to save battery power. You can
change how long your screen stays active before it turns off.
Find and tap [Settings] > [Display] > [Screen timeout].
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Select an option.
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