Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) User Manual
Page 73
Troubleshooting
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73
3.
Move the joystick to highlight the Diagnostic icon
and then press the
joystick to confirm. A gray test pattern appears.
4.
Carefully inspect the screen for abnormalities.
5.
Press the joystick 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.
Press the joystick to end the diagnostic program.
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