Toshiba T4500 User Manual page 50

Pressing the Fn + arrow key increases or decreases the brightness of both the color
Check 3:
and monochrome LCD panel and the contrast on the monochrome LCD panel.
Procedure 2 External CRT Check
Connect the external CRT to the computer's external monitor port, then press Fn + F5.
If the external CRT works correctly, the internal LCD display may be damaged. Go to Procedure 4.
If the external CRT appears to have the same problem as the internal LCD, the display controller
may be damaged. Go to Procedure 3.
Procedure 3 Diagnostic Test Program Execution Check
The Display Test program is stored on the ASP Diagnostics Diskette. This program checks the
display controller on the system board. After loading Toshiba MS-DOS, run the Diagnostics
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Increases the brightness of the LCD panel.
Decreases the brightness of the LCD panel.
Increases the contrast of the LCD panel. This key is
effective only on the T4500/T4600 monochrome LCD.
Decreases the contrast of the LCD panel. This key is
effective only on the T4500/T4600 monochrome LCD.