Service manual

Running the Dell Diagnostics: Dell Latitude CP
Checks the video subsystem's ability to present data and color in graphics modes
● Color Palettes Test
Checks the video subsystem's ability to display all of the available colors
● Solid Colors Test
Checks the video subsystem's ability to show screens full of solid colors and allows you
to check for missing color pixels
Many of these tests display characters or graphics on the screen for you to verify. Samples of
these screens are shown in
Diagnostic Video Tests.
NOTE: The default limit for testing SVGA modes is No. If you are testing an external
monitor, change the limit to Yes.
Keyboard Test Group
The subtests in the Keyboard test group verify the correct operation of your keyboard and the
keyboard controller chip.
Why Run a Keyboard Test?
Keyboard problems are not always caused by the keyboard. For example, a complete lockup
of the computer, rendering the keyboard inoperable, is probably not caused by a problem with
the keyboard. There are two symptoms that are likely to be keyboard-related. Sometimes, the
configuration of a program changes the function of a key or key combination. Similarly, key
configuration programs like ProKey can change a key's function. Because these programs are
memory resident, be sure to clear them out of the computer's memory before running a subtest
in the Keyboard test group. (Clear them from memory by booting the computer from the Dell
Diagnostics Diskette.) When these possibilities have been eliminated, and if the following
symptoms occur, you should run one or more of the subtests in the Keyboard test group:
● When you press a key, the character represented by that key appears repeatedly; the
key seems to be stuck. Run the Stuck Key Test.
● When you press a key and the response is different from the usual response or the
response you anticipated, the key contact may be damaged. Run the Keyboard
Interactive Test.
● When a key does not work at all, run all of the subtests in the Keyboard test group.
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