Panasonic Toughbook CF-18BCAGCMM Reference Manual page 126

Dealing with Problems (Advanced)
Display
No display after powering on
The power has not been turned off, but
after a certain period of time, there is
no display
When the battery pack is used, the
screen is darker than when the AC
adaptor is connected
The LCD brightness changes a
number of times when the AC adaptor
is disconnected
Image colors are not reproduced as
expected when displaying
photographs or other images
An afterimage appears (e.g., green,
red, and blue dots remain on the
display) or there are dots not
displaying the correct colors
When there is no display to an external display,
• Check your cable connection to the external display.
• Confirm your display is powered on.
• Check the settings for your external display.
The display destination may be set to the external display.
Try changing the display destination by pressing Fn+F3.
If you want to switch the display destination repeatedly by pressing Fn+F3,
make sure that the display destination has switched completely each time
before pressing Fn+F3 again.
Press Fn+F2 and adjust the LCD brightness.
Has the computer been set to the power-saving mode? To resume operation of
your computer from the condition the power of the display is off (for energy
conservation purposes), press any key unrelated to the direct triggering of a
selection, like Ctrl.
To save power, your computer may have automatically entered the standby
mode (power indicator blinks green) or hibernation mode (power indicator turns
off). In such cases, slide the power switch.
Press Fn+F2 and adjust the LCD brightness. Note, however, that when the
LCD brightness is increased, the battery running time will become shorter.
The LCD brightness can be set to separate levels for when the AC adaptor is
connected and when it is disconnected.
Intel(R) Display Power Saving Technology (
cally changes the LCD brightness.
We recommend removing the check mark from [Intel(R) Display Power Saving
Technology]. ( page 38)
If an image is displayed for a prolonged period of time, an afterimage may
appear. This is not a malfunction. The afterimage will disappear when a
different screen is displayed.
High-precision and advanced technologies are necessary in the production of
color liquid crystal displays (color LCDs). Therefore, if 0.002% or less of the
picture elements either fail to light or remain constantly lit (that is, more than
99.998% of elements are functioning properly), no defect is considered to exist.
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page 38) is active and automati-