Dell ST2220TC appendix Common Problems, Common Symptoms What You See Possible Solutions

4.Ensure that the screen is looking normal.

5.Press the shortcut key 4 key on the front panel again. The color of the screen changes to red.

6.Repeat steps 5 to inspect the display in green, blue, black, and white colored screens.

The test is complete when the white screen appears. To exit, press the shortcut key 4 key 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	What You See		Possible Solutions
No Video/Power LED	No picture	•	Ensure that the video cable connecting the monitor and the computer is properly connected and secure.
off		•	Verify that the power outlet is functioning properly using any other electrical equipment.
No Video/Power LED	No picture or no	•	Increase brightness & contrast controls via OSD.
on	brightness	•	Perform monitor self-test feature check.
		•	Check for bent or broken pins in the video cable connector.
		•	Press Shortcut key 4 to call out the Input Select Source OSD menu. Select the correct input source.
		•	Run the built-in diagnostics.
Poor Focus	Picture is fuzzy,	•	Perform Auto Adjust via OSD.
	blurry, or ghosting	•	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 (16:9).
Shaky/Jittery Video	Wavy picture or fine	•	Perform Auto Adjust via OSD.
	movement	•	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.
Missing Pixels	LCD screen has	•	Turn off the monitor and then turn it back on.
	spots	•	Pixel that is permanently off is a natural defect that can occur in LCD technology.
		•	Run the built-in diagnostics
Stuck-on Pixels	LCD screen has	•	Turn off the monitor and then turn it back on.
	bright spots	•	Pixel that is permanently off is a natural defect that can occur in LCD technology.
		•	Run the built-in diagnostics
Brightness Problems	Picture is too dim or	•	Reset the monitor to Factory Settings.
	too bright	•	Auto Adjust via OSD.
		•	Adjust brightness & contrast controls via OSD.
Geometric Distortion	Screen is not	•	Reset the monitor to Factory Settings.
	centered correctly	•	Auto Adjust via OSD.
		•	Adjust brightness & contrast controls via OSD.
		NOTE: When using 'DVI-D' or 'HDMI', the positioning adjustments are not available.
Horizontal/Vertical	Screen has one or	•	Reset the monitor to Factory Settings.
Lines	more lines	•	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' or 'HDMI', the Pixel Clock and Phase adjustments are not available.
Synchronization	Screen is scrambled	•	Reset the monitor to Factory Settings.
Problems	or appears torn	•	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.
Safety Related	Visible signs of	•	Do not perform any troubleshooting steps.
Issues	smoke or sparks	•	Contact Dell immediately.