Service manual

Running the Dell Diagnostics: Dell Latitude CP
If the following symptoms still occur, run the appropriate test(s) as follows:
● If your display or external monitor shows a partially formed or distorted image, run all of
the subtests in the Video test group.
● If the alignment of text or images is off, regardless of the program you are running, run
the Text Mode Character Test, Text Mode Pages Test, and Graphics Mode Test.
● If the color on the display or external monitor is intermittent or not displayed at all, run
the Text Mode Color Test, Color Palettes Test, and Solid
Colors Test.
● If your display or external monitor malfunctions in one mode but works fine in another
(for example, text is displayed correctly, but graphics are not), run the Text Mode
Character Test, Text Mode Color Test, Text Mode Pages Test, and Graphics Mode Test.
Subtests
The eight subtests in the Video test group confirm the following video functions:
● Video Memory Test
Checks the read/write capability of the video memory in various video modes
● Video Hardware Test
Checks the cursor registers and the horizontal and vertical retrace bit registers in the
video controller
● Text Mode Character Test
Checks the video subsystem's ability to present data in text modes
● 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 pages on
the screen, one page at a time
● Graphics Mode Test
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