Dell C1422H User Manual - Page 29

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Built-in diagnostics

To run the built-in diagnostics:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).

2. Press and hold button

3. Use button Up/[+] to switch pattern.

A gray test pattern appears at the beginning of the diagnostic program.

4. Carefully inspect the screen for abnormalities.

5. Press button Up/[+] to change the test patterns.

6. Repeat steps 4 and 5 to inspect the display in red, green, blue, black, white and text

screens.

7. When in White color test screen, check for white color uniformity and if there white color

appears greenish/reddish, etc.

8. Press button Up/[+] to end the diagnostic program.

for about 3 seconds and wait for a pop up diagnostic pattern.

Troubleshooting

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