Dell U4320Q Users Guide - Page 54

Common Problems, Common, Symptoms, What You, Experience, Possible Solutions

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Common Problems The following table contains general information about common monitor problems you might encounter and the possible solutions: Common Symptoms What You Experience Possible Solutions No Video/Power No picture LED off • 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 in the Input Source menu. No Video/Power LED on No picture or no brightness • Increase brightness and 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 in the Input Source menu. No video When connected • Unplug the HDMI/DisplayPort/USB Type C cable at HDMI/ to some dongle/ from dongle/docking device, then plug the docking DisplayPort/USB docking device Thunderbolt cable to the notebook. Plug the HDMI/ Type-C port at the port, DisplayPort/USB Type-C cable 7 seconds later. there is no video when unpluging/ pluging the Thunderbolt cable from the notebook Missing Pixels LCD screen has spots • 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: www.dell.com/support/monitors. Stuck-on Pixels LCD screen has bright spots • 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 PixelPolicy, see Dell Support site at: www.dell.com/support/monitors. Brightness Problems Picture too dim • Reset the monitor to factory settings. or too bright • Adjust brightness and contrast controls via OSD. Safety Related Visible signs of • Do not perform any troubleshooting steps. Issues smoke or sparks • Contact Dell immediately. 54 | Troubleshooting

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Troubleshooting
Common Problems
The following table contains general information about common monitor problems you might
encounter and the possible solutions:
Common
Symptoms
What You
Experience
Possible Solutions
No Video/Power
LED off
No picture
•
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 in
the
Input Source
menu.
No Video/Power
LED on
No picture or no
brightness
•
Increase brightness and 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 in
the
Input Source
menu.
No video
at HDMI/
DisplayPort/USB
Type-C port
When connected
to some dongle/
docking device
at the port,
there is no video
when unpluging/
pluging the
Thunderbolt
cable from the
notebook
•
Unplug the HDMI/DisplayPort/USB Type C cable
from dongle/docking device, then plug the docking
Thunderbolt cable to the notebook. Plug the HDMI/
DisplayPort/USB Type-C cable 7 seconds later.
Missing Pixels
LCD screen has
spots
• 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:
www.dell.com/support/monitors
.
Stuck-on Pixels
LCD screen has
bright spots
• 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 PixelPolicy, see Dell Support site at:
www.dell.com/support/monitors
.
Brightness
Problems
Picture too dim
or too bright
•
Reset the monitor to factory settings.
•
Adjust brightness and contrast controls via OSD.
Safety Related
Issues
Visible signs of
smoke or sparks
•
Do not perform any troubleshooting steps.
•
Contact Dell immediately.