Dell St2220t Users Guide

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

							   
Product - Specific Problems  
 
 
Universal Serial Bus (USB) Specific Problems  
   
Touch Screen problems  Intermittent 
Problems Monitor malfunctions 
on & off l Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.    
l Reset the monitor to Factory Settings.    
l Perform monitor self - test feature check to determine if the intermittent problem occurs in self - test mode.    
Missing Color Picture lacks color l Perform monitor  self - test  feature check.    
l Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.    
l Check for bent or broken pins in the video cable connector.    
l Run the built - in diagnostics   
Wrong Color Picture color not 
good l Change the Color Setting Mode in the  Color Settings OSD  to Graphics or Video depending on the 
application.   
l Try a different Color Preset Setting in Color Settings OSD. Adjust R/G/B value in Color Settings OSD if the 
Color Management is turned off.   
l Change the Input Color Format to PC RGB or YPbPr in the Advance Setting OSD.   
l Run the built - in diagnostics   
Image retention from 
a static image left on 
the monitor for a 
long period of time Faint shadow from 
the static image 
displayed appears on 
the screen l Use the Power Management feature to turn off the monitor at all times when not in use  (for more 
information, see  Power Management Modes ).   
l Alternatively, use a dynamically changing screensaver.    
Specific Symptoms What You See Possible Solutions
Screen image is too small Image is centered on screen, 
but does not fill entire viewing 
area l R eset the monitor to Factory Settings .   
Cannot adjust the monitor with 
the keys on the front panel OSD does not appear on the 
screen l Turn off the monitor, unplug the power cord, plug back, and then turn on the monitor .   
No Input Signal when user 
controls are pressed No picture, the LED light is 
white. When you press up, 
down or Menu key, the 
message appears   l Check the signal source. Ensure that the Computer is not in the power saving mode by 
moving the mouse or pressing any key on the keyboard.    
l Check whether the signal cable is plugged in properly. Re - plug the signal cable if 
necessary.    
l Reset the computer or video player.    
The picture does not fill the 
entire screen. The picture cannot fill the 
height or width of the screen l Due to different video formats (aspect ratio) of DVDs, the monitor may display in full 
screen.   
l Run the built - in diagnostics   
NOTE:  When choosing DVI - D or HDMI mode ,   the  Auto Adjust    function  is not available.  
Specific Symptoms What You See Possible Solutions
USB interface is not working USB peripherals are not 
working l Check that your monitor is turned ON.    
l Reconnect the upstream cable to your computer.    
l Reconnect the USB peripherals (downstream connectoryf     
l Switch off and then turn on the monitor again.    
l Reboot the computer.    
l Some USB devices like external portable HDD require higher electric current; connect the 
device directly to the computer system.   
High Speed USB 2.0 interface is 
slow. High Speed USB 2.0 
peripherals working slowly or 
not working at all l Check that your computer is USB 2.0 - capable.    
l Some computers have both USB 2.0 and USB 1.1 ports. Ensure that the correct USB port 
is used.    
l Reconnect the upstream cable to your computer.    
l Reconnect the USB peripherals (downstream connectoryf     
l Reboot the computer.    
Common Symptoms   Possible Solutions  
Touch screen does not respond 
to touches l Make sure the USB cable is connected from the monitor to the computer.   
l Make sure the touch screen is connected to a USB port that provides enough power for it (some peripherals, such as keyboards, include 
USB ports that do not provide sufficient power for some devices). Try connecting the touch screen to a different USB port on the computer. 
l Make sure Control panel  - >  System & security  - >  System  - >  Device Manager - >.   
   
l HID touch device is recognized as shown below.     
						

							Calibrating the Touch Screen   
ST2220T uses standard Windows7 calibration:  
1. Run Windows Control Panel  - >  Hardware & Sound  - >  Tablet PC  - >  Calibrate.   
 
2. Touch your finger (or stylus) on the screen at that center of black cross until the cross moves.   
3. The pointer moves to fifteen further positions in sequence for the first calibration and three further positions in sequence if previous calibration data is 
stored.   
4. Store the calibrated data to complete the touch screen calibration procedure.   
This completes the touch screen calibration procedure.  
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l Before changing any settings, try restarting the computer.& Dell™ ST2220T.   
The cursor does not accurately 
follow your finger when you 
touch the screen   l Try restarting the computer & Dell™ ST2220T.   
l If the above remedies do not work, the touch screen needs calibrating. To fix the problem, see  Calibrating the Touch Screen
The cursor moves erratically    l Make sure there is nothing blocking the optics of the touch screen. There are three sensors in the top corners and a left bottom corner of 
the screen that need unobstructed views across the surface of the display to the bottom and side edges.   
l Clean the panel surface and edges of the screen. See  Maintenance  for instructions.   
l If the above remedies do not work, Try restarting the computer.& Dell™ ST2220T.   
NOTE:  When removing your finger, lift it straight off the screen, making sure you don ’ t drag it across the screen. Dell ST2220T monitor.
NOTE:  Test the calibration by moving the mouse pointer around the screen checking that it closely follows your finger.
NOTE:  If the calibration is not satisfactory, you can re - calibrate.
NOTE:  Make sure your finger is placed accurately at each calibration point.
NOTE:  If your finger pointed with poor accuracy, press & hold the point to go back to the previous state.