Display Test - Toshiba PORTEGE M400 Maintenance Manual

3 Tests and Diagnostics

3.10 Display Test

To execute the Display Test, select 4 from the DIAGNOSTIC TEST MENU, press Enter
and follow the directions on the screen. Move the highlight bar to the subtest you want to
execute and press Enter.
Subtest 01 VRAM read/write for VGA
This subtest writes the constant data (AAh and 55h) to the video RAM. The
data is read 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.
To exit this subtest and return to the DISPLAY TEST menu, press Enter.
Subtest 03 Gradation for LCD
This subtest displays bands of gradations for mixed colors, then for red, green,
and blue. Next, it displays eight solid colors full screen: red, semi-red, green,
semi-green, blue, semi-blue, white, and semi-white. Each color displays for
three seconds.
3-26 [CONFIDENTIAL] PORTEGE M400 Maintenance Manual (960-541)

3.10 Display Test