Service manual

Diagnostic Video Tests: Dell Latitude CP
Diagnostic Video Tests: Dell™ Latitiude™ CP
Overview Video Memory Test Video Hardware Test
Text Mode Character Test Text Mode Color Test Text Mode Pages Test
Graphics Mode Test Color Palettes Test Solid Colors Test
Overview
The Video test group of the Dell Diagnostics consists of the following eight tests, each of which
verifies a particular video function or group of functions on your built-in display or on an
external monitor:
● Video Memory Test - Checks the integrity of characters generated from data in the video
memory
● Video Hardware Test - Checks the functions of the cursor register and the horizontal
and vertical retrace bit registers
● Text Mode Character Test - Checks the video subsystem's ability to present text mode
data
● Text Mode Color Test - Checks the video subsystem's ability to present color in text
modes
● Text Mode Pages Test - Checks the video subsystem's ability to map and present all
available video text pages on the display or monitor, one page at a time
● Graphics Mode Test - Checks the video sub-system's ability to present graphics mode
data and colors
● Color Palettes Test - Checks the video subsystem's ability to display all available colors
● Solid Colors Test - Checks the video subsystem's ability to show screens full of solid
colors and to display all pixels
All of these tests, except the Video Memory Test and the Video Hardware Test, are interactive.
These interactive tests display images on the display or monitor and require you to respond
with the following steps:
1. Examine a displayed image for correctness.
2. If an image is correct, type y.
3. If an image is incorrect, type n
.
file:///I|/SERVICE%20MANUALS/DELL%20MANUA...0REF%20AND%20TROUBLESHOOTING/DIAGNOST.HTM (1 of 9)6/21/2004 1:38:52 AM