Sony PSP-1003 - Manual (Page 37)

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Using the display button
The display button is used to adjust screen brightness.
1
Press the display button.
Each time you press the button, the display changes as follows:
Hint
Level 4 can be selected only while the PSP™ system is plugged in using the AC Adaptor.
1
Hold down the display button for more than one second.
The backlight will turn off and the screen will go blank.
If you press any of the system buttons, the screen will be displayed again.
Using the display button
Adjusting screen brightness
Level 1
Level 2
Level 3
(Level 4)
Turning off the backlight
POWER
HOLD
SELECT START
Darker
Brighter