Panasonic Toughbook CF-C1ADAAZ6M Reference Manual page 181

Troubleshooting (Advanced)
Problems with Display
Screen is too dark or too bright
Press Fn + F2 or push
Press Fn + F1 or push
If the screen becomes darker after disconnecting the AC adaptor:
The computer has different set brightness levels for when the AC adaptor is connected and for when it is not connected.
Based on the settings in the default setting, the screen will become darker when the AC adaptor is removed. If you press
Fn + F2 to increase the brightness when the AC adaptor is not connected, this brightness is maintained, and determines
the brightness next time the AC adaptor is disconnected.
(Making the display brighter shortens the battery operating time.)
If you make the display brighter when the AC adaptor is not connected, the battery operation time will become shorter.
There are red, green, or blue dots on the screen, or there is unevenness in
colors and brightness on the screen
The following are not malfunctions.
• Although advanced high-precision technologies are used in the production of color LCD screens, 0.002% or less of the
picture elements may be dark or remain constantly lit (i.e., more than 99.998% of elements function properly).
• Due to the natural characteristics of LCD screens, you may notice unevenness in colors and brightness depending on
your angle of view. Hues may also vary by product.
(LCD Brightness Up) button (For CF-C1 Series) (becomes brighter).
(LCD Brightness Down) button (For CF-C1 Series) (becomes darker).
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