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Procedure 1
Brightness and Contrast Control Check
Brightness is changed by the following Hot keys. If the display is blank, go to Check 1. If
you cannot change the brightness, go to Check 3. If you cannot change the contrast, go to
Check 4.
NOTE: the contrast control is effective only on the T4700CS color LCD. You cannot
change the contrast of the T4700CT/T4800CT color LCD.
Pressing Fn+F5 selects the active display device. Each time you press Fn+F5 ,
Check 1
the active display device changes in the following order: LCD; Dual Display,
which activates both LCD and CRT; and CRT.
If the display is still blank, go to Check 2.
Note: Use of of the Fn+F5 hotkey for display selection has different effects on the
T4700CS and T4700CT/T4800CT.
For the T4700CS, the effect of the Fn+F5 hotkey depends on the Power on display
setting, as follows:
(a) Simultaneous:Toggles between Internal and Simultaneous (SVGA is not supported).
(b) Internal/External (No external monitor connected):Toggles between Internal and
Simultaneous (SVGA is not supported). (c) Internal/External (External monitor
connected):This hotkey does not work.
For the T4700CT/T4800CT, Fn+F5 hotkey changes the display in the following order,
regardless of the Power on display setting:
→ Internal → Simultaneous → External →
Pressing Fn+F1 to sets the computer in the instant security mode. Once set in
Check 2
this mode, the display becomes blank and the keyboard is locked to prevent others
from gaining access to your computer. To restore the computer from the instant
security mode, enter the instant password or turn the power off and back on.
T4700CS, T4700CT, T4800CT
2-35
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