Common Problems; Product Specific Problems - Dell U2412M User Manual

7. Repeat steps 5 and 6 to inspect the display in green, blue, black and white screens.
The test is complete when the white screen appears. To exit, press Button 4 again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool, the monitor is functioning properly. Check the video card and computer.

Common Problems

The following table contains general information about common monitor problems you might encounter and the possible solutions:
Common Symptoms
No Video/Power LED off No picture
No Video/Power LED on No picture or no brightness
Poor Focus Picture is fuzzy, blurry, or ghosting
Shaky/Jittery Video Wavy picture or fine movement
Missing Pixels LCD screen has spots
Stuck-on Pixels LCD screen has bright spots
Brightness Problems Picture too dim or too bright
Geometric Distortion Screen not centered correctly
Horizontal/Vertical Lines Screen has one or more lines
Synchronization Problems Screen is scrambled or appears torn
Safety Related Issues Visible signs of smoke or sparks
Intermittent Problems Monitor malfunctions on & off
Missing Color Picture missing color
Wrong Color Picture color not good
Image retention from a static image left on the Faint shadow from the static image displayed appears on
monitor for a long period of time the screen

Product Specific Problems

Specific Symptoms
Screen image is too small Image is centered on screen, but does not fill entire
viewing area
Cannot adjust the monitor with the buttons on the front OSD does not appear on the screen
panel
No input signal when user controls are pressed No picture, the LED light is blue
What You Experience
Ensure that the video cable connecting the monitor and the computer is properly connected and secure.
Verify that the power outlet is functioning properly using any other electrical equipment.
Ensure that the power button is depressed fully.
Ensure that the correct input source is selected via the
Increase brightness & contrast controls via OSD.
Perform monitor self-test feature check.
Check for bent or broken pins in the video cable connector.
Run the built-in diagnostics.
Ensure that the correct input source is selected via the
Perform Auto Adjust via OSD.
Adjust the Phase and Pixel Clock controls via OSD.
Eliminate video extension cables.
Reset the monitor to Factory Settings.
Change the video resolution to the correct aspect ratio (16:10).
Perform Auto Adjust via OSD.
Adjust the Phase and Pixel Clock controls via OSD.
Reset the monitor to Factory Settings.
Check environmental factors.
Relocate the monitor and test in another room.
Cycle power on-off.
Pixel that is permanently off is a natural defect that can occur in LCD technology.
For more information on Dell Monitor Quality and Pixel Policy, see Dell Support site at: support.dell.com.
Cycle power on-off.
Pixel that is permanently off is a natural defect that can occur in LCD technology.
For more information on Dell Monitor Quality and Pixel Policy, see Dell Support site at: support.dell.com.
Reset the monitor to Factory Settings.
Auto Adjust via OSD.
Adjust brightness & contrast controls via OSD.
Reset the monitor to Factory Settings.
Auto Adjust via OSD.
Adjust horizontal & vertical controls via OSD.
NOTE:
When using DVI-D input, the positioning adjustments are not available.
Reset the monitor to Factory Settings.
Perform Auto Adjust via OSD.
Adjust Phase and Pixel Clock controls via OSD.
Perform monitor self-test feature check and determine if these lines are also in self-test mode.
Check for bent or broken pins in the video cable connector.
Run the built-in diagnostics.
NOTE: When using DVI-D input, the Pixel Clock and Phase adjustments are not available.
Reset the monitor to Factory Settings.
Perform Auto Adjust via OSD.
Adjust Phase and Pixel Clock controls via OSD.
Perform monitor self-test feature check to determine if the scrambled screen appears in self-test mode.
Check for bent or broken pins in the video cable connector.
Restart the computer in the safe mode.
Do not perform any troubleshooting steps.
Contact Dell immediately.
Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
Reset the monitor to Factory Settings.
Perform monitor self-test feature check to determine if the intermittent problem occurs in self-test mode.
Perform monitor self-test feature check.
Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
Check for bent or broken pins in the video cable connector.
Change the Color Setting Mode in the Color Settings OSD to Graphics or Video depending on the application.
Try different Color Preset Settings in Color Settings OSD. Adjust R/G/B value in Color Settings OSD if the Color Management is turned off.
Change the Input Color Format to PC RGB or YPbPr in the Advance Setting OSD.
Run the built-in diagnostics.
Use the Power Management feature to turn off the monitor at all times when not in use (for more information, see
Alternatively, use a dynamically changing screensaver.
What You Experience
Check the Scaling Ratio setting in Image Setting OSD
Reset the monitor to Factory Settings.
Turn off the monitor, unplug the power cord, plug it back, and then turn on the monitor.
Check whether the OSD menu is locked. If yes, press and hold the button above the Power button for 10 seconds to unlock (for more information, see
Check the signal source. Ensure the computer is not in the power saving mode by moving the mouse or pressing any key on the keyboard.
Possible Solutions
Input Source Select button.
Input Source Select button.
Possible Solutions
Power Management Modes).
Menu Lock).