Toshiba 50CT User Guide - Page 79

Display Test, Tests and Diagnostics

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3.7 Display Test 3 Tests and Diagnostics 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 six subtests that test the 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 (2MB: A0000h-AFFFFh). 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 image below displays on the screen when this subtest executes. Subtest 03 To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. Gradation for LCD This subtest displays eight colors: red, semi-red, green, semi-green, blue, semiblue, white, and semi-white. Each color displays full screen for three seconds. 3-14 Libretto 50CT/70CT Maintenance Manual

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3.7
Display Test
3
Tests and Diagnostics
3-14
Libretto 50CT/70CT Maintenance Manual
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 six subtests that test the 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
(2MB: A0000h-AFFFFh).
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 image below
displays on the screen when this subtest executes.
To exit this subtest and return to the DISPLAY TEST menu, press
Ctrl +
Break
.
Subtest 03
Gradation for LCD
This subtest displays eight colors: red, semi-red, green, semi-green, blue, semi-
blue, white, and semi-white. Each color displays full screen for three seconds.