Toshiba satellite a20 series Manuel D’Utilisation
3 Tests and Diagnostics
3.7 Display Test
3.7 Display
Test
To execute the Display Test, select
4
from the DIAGNOSTIC TEST MENU, press
Enter
and follow the directions on the screen. The Display test contains seven subtests that test the
display in various modes. Move the highlight bar to the subtest you want to execute and
press
display in various modes. Move the highlight bar to the subtest you want to execute and
press
Enter
.
Subtest 01
VRAM Read/Write for VGA
This subtest writes constant data AAh and 55h and address data to video
RAM 8MB. This data is then read from the video RAM and compared to the
original data.
RAM 8MB. This data is then read from the video RAM and compared to the
original data.
Subtest 02
Gradation for VGA
This subtest displays four colors: red, green, blue and white from left to right
across the screen from black to maximum brightness. The display below
appears on the screen when this subtest is executed.
across the screen from black to maximum brightness. The display below
appears on the screen when this subtest is executed.
To exit this subtest and return to the DISPLAY TEST menu, press
Enter.
Subtest 03
Gradation for LCD
This subtest displays several horizontal bands of multiple color, followed by
red, green and blue bars. Each bar displays black on the top and the brightest
color at the bottom.
red, green and blue bars. Each bar displays black on the top and the brightest
color at the bottom.
Next, this subtest displays full screen of eight colors: red, semi-red, green,
semi-green, blue, semi-blue, white, and semi-white.
semi-green, blue, semi-blue, white, and semi-white.
Each color displays for three seconds.
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Satellite A20 Maintenance Manual (960-444)