Toshiba satellite a20 series Benutzerhandbuch

To execute the Display Test, select 

 from the DIAGNOSTIC TEST MENU, press 

 

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 

.  

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. 

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 

  

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.  

Next, this subtest displays full screen of eight colors: red, semi-red, green, 
semi-green, blue, semi-blue, white, and semi-white.  

Each color displays for three seconds.