3-14 420 Series
3.7 Display Test
To execute the Display Test, select 4 from the DIAGNOSTIC TEST MENU, press Enter and
follow the directions displayed 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 display below
appears on the screen when this subtest is executed.
To exit this subtest and return to the DISPLAY TEST menu, press Ctrl +
Break, then press the Enter key.
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 is displayed full screen for three
seconds.
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