Troubleshooting the Dell S2340T Monitor

Guide for troubleshooting issues with the Dell S2340T monitor.

Dell S2340T monitor

Table of Contents

• Using the Monitor Self-Test
• Using the Built-In Diagnostics
• Touch Screen Performance
• Audio Performance
• Network Connectivity
• Common Monitor Issues
• Product Specific Issues
• USB Connectivity

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Using the Monitor Self-Test

The monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps:

1. Turn off both the computer and the monitor.
2. Unplug the video cable from the back of the monitor. To ensure proper Self-Test operation, remove all digital (white connector) and analog (blue connector) cables from the back of the computer.
3. Turn on the monitor. The floating dialog box would appear on-screen if the monitor cannot sense a video signal but is working properly.
4. This box will also appear during normal system operation if the video cable becomes disconnected or damaged.
   

 

If the monitor continues to be blank after verifying that the self-test works, the problem must be the video cable, the video adapter in the computer, or the computer itself.

• Turn off your monitor and re-connect the video cable, then turn on both your computer and the monitor.

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Using the Built-In Diagnostics

1. Make sure the screen is clean of dust and debris.
2. Unplug the video cables from the back of the computer or monitor. The monitor should go into self-test mode.
3. Press and hold Button 1 and Button 4 simultaneously for 2 seconds (Figure 2). A gray screen should appear.
   

 

The test is complete when the text screen appears. To exit, press Button 4 again. If you do not detect any screen abnormalities using the built-in diagnostic tool, the monitor is functioning properly. Check the video display adapter and the computer if problems persist.

• Carefully inspect the screen for abnormalities.
• Press Button 4 on the front panel again. The color of the screen should change to red.
• Inspect the screen for abnormalities.
• Repeat steps 5 and 6 to inspect the display in green, blue, black, white, and text screens.

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Touch Screen Performance

You may notice the following with the monitor:

• Touch screen does not respond to touches.
• Cursor does not accurately follow your finger when you touch the screen.
• Cursor moves erratically.

In order to make the touchscreen capabilities to work, make sure:

• The USB cable connects the computer to the monitor.
• Your computer should support USB 2.0 or 3.0 technology.
• Turn off the monitor and disconnect the AC adapter from the base, then reconnect the AC adapter and turn the monitor back on. If this does not help, try restarting the computer, as well.
• The Displaylink software has been installed on the computer.

If the touchscreen cursor is moving or behaving erratically:

• Make sure nothing is blocking the optics of the touch screen. Notes or other objects overlapping the edges or foreign substances on the screen can interfere with the touch-sensing capability.
• Remove gloves if you are wearing them.
• Dry your hands if they are wet.
• Move metal objects and conductive items away from the screen.
• Clean the screen surface.

To calibrate the touchscreen:

• Go to the Windows Control Panel and select Tablet PC Settings.
• On the Display tab click Calibrate.
• Follow the instructions to calibrate the screen.
• You may choose to save the calibration date.

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Audio Performance

If you are experiencing problems with audio through the S2340T monitor:

1. Make sure all cables are well connected including the USB cables and/or any other video cable you are using.
2. Check the configuration of your computer's audio and make sure it is on and the volume is up.
3. Check the On-Screen Display (OSD) menu on the monitor and check the Audio Settings (Figure 3) to make sure you have the correct Audio Source (eg. HDMI/DP or USB).
   

 

• Make sure the audio output source on the computer and the audio input source on the monitor match.
• Make sure the volume control setting is up high enough to hear computer audio.

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Network Connectivity

If the monitor is unable to connect to the network to support your computer:

1. Right-click on the network status icon in the system tray and choose the second option (Figure 4).
   

 

• Click Change adapter settings (Figure 5).
  

 

• Double-click the Ethernet icon (Figure 6).
  

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Common Monitor Issues

Common Symptoms	What You Experience	Possible Solutions
No Video/Power LED Off	No Picture	Make sure the video cable connecting the monitor to the computer is properly connected. Make sure the power outlet is functioning properly. Make sure the power button has been pressed. Make sure the correct input source is selected by checking the Input Source Menu.
No Video/Power LED On	No picture or no brightness	Increase the brightness and contrast using the On-Screen Display (OSD) menu. Perform the monitor self-test check. Check for bent or broken pins in the video cable connector. Run the built-in diagnostics. Make sure the correct input source is selected by checking the Input Source Menu.
Poor Focus	Picture is fuzzy, blurry or ghosting	Adjust the Phase and Pixel Clock controls using the OSD. Avoid using any video extension cables. Reset the monitor to Factory Settings using the OSD. Change the video resolution to correct aspect ratio (16:9).
Shaky/Jittery Video	Wavy picture or fine movement	Adjust the Phase and Pixel Clock using the OSD. Reset the monitor to Factory Settings. Check environmental factors. Relocate the monitor and try it in a different location.
Missing Pixels	LCD screen has spots	Turn the monitor off and back on. Be aware that a pixel that is permanently off is a natural defect that can occur with all LCD technology. For more information refer to Dell Knowledge Base Article Dell LCD Display Pixel Policy
Stuck-on Pixels	LCD screen has bright spots	Turn the monitor off and back on. Be aware that a pixel that is permanently off is a natural defect that can occur with all LCD technology. For more information refer to Dell Knowledge Base Article Dell LCD Display Pixel Policy
Brightness Problems	Picture too dim or too bright	Reset the monitor to Factory Settings. Auto-Adjust using the on-screen display (OSD) menu. Adjust the brightness and contrast controls using the OSD.
Geometric Distortion	Screen is not centered correctly	Reset the monitor to Factory Settings. Adjust the horizontal and vertical controls using the OSD. Note: When using DVI-D or HDMI input, the positioning adjustments are not available
Horizontal/Vertical Lines	Screen has one or more lines	Reset the monitor to Factory Settings. Adjust the Phase and Pixel Clock controls using the 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. Run the built-in diagnostics. Note: When using the DVI-D or HDMI input, the Pixel Clock and Phase adjustments are not available.
Synchronization Problems	Screen is scrambled or appears torn	Reset the monitor to Factory Settings. Adjust the Phase and Pixel Clock controls using the 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 Safe Mode.
Safety Related Issues	Visible signs of smoke or sparks	Do not perform any troubleshooting steps. Contact Dell Technical Support.
Intermittent Problems	Monitor malfunctions on and off	Make sure the video cable connecting the monitor to the computer is connected properly. Reset the monitor to Factory Settings. Perform the monitor self-test feature check to determine if the intermittent problems occur in self-test mode.
Missing Color	The picture is missing a color	Perform the self-test feature check. Make sure the video cable connecting the monitor to the computer is connected properly. Check for bent or broken pins on the video connector.
Wrong Color	Picture has incorrect colors	Change the Color Setting Mode in the Color Settings of the OSD to Graphics or Video depending on the application. Try different Color Preset Settings in the Color Settings OSD. Adjust the R/G/B values in the Color Settings OSD if Color Management is turned off. Change the Input Color Format to PC RGB or YPbPr in the Advance Settings OSD. Run the built-in diagnostics.
Image Retention from a Static Image left on the screen	Faint shadow from the static image is visible on the screen	Use the Power Management settings to turn off the monitor at all times when not in use. Alternatively, use a dynamically changing screensaver.

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Product Specific Issues

Specific Symptoms	What You Experience	Possible Solutions
Screen Image is too small	Image is centered on the screen but does not fill the viewing area.	Check the Scaling Ration setting in the Image Setting On-Screen Display (OSD) menu. Reset the monitor to Factory Settings.
Cannot Adjust the Monitor with the Buttons on the Front Panel	OSD menus do not appear on the screen.	Turn off the monitor, unplug the power cord, plug it back in, and then turn on the monitor. Check whether the OSD menu is locked. If it is, press and hold the button above the Power Button for 10 seconds to unlock it.
No Input Signal when User Controls are pressed	No picture, the LED is bright blue	Check the signal source. Make sure the computer is not in the power saving mode by moving the mouse or pressing a key on the keyboard. Check whether the video cable is plugged in properly. re-plug the video cable if necessary. Reset the computer or video player.
The Picture does not fill the entire screen	The picture does not fill the height or width of the screen	If a DVD is being played, check the specifications as some DVDs will only play in full-screen mode. Run the built-in diagnostics.

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USB Connectivity

Specific Symptoms	What You Experience	Possible Solutions
USB Interface is not working	USB peripherals plugged into the monitor do not work.	Make sure the monitor is turned on. Reconnect the upstream USB cable between the monitor and the computer. Reconnect the downstream connectors between the monitor and the peripheral device being used. Turn the monitor off and back on. Restart the computer. Some USB devices like external portable hard drivers require higher electrical current. Connect these devices directly into the computer.
High-Speed USB 2.0 interface is slow	High-Speed USB 2.0 peripherals are working slowly or not working at all.	Check that your computer supports USB 2.0. Verify the computer port is a USB 2.0 port (Some computers have both USB 2.0 and USB 1.1 ports.) Reconnect the upstream cable between the monitor and the computer. Reconnect the downstream connectors between the monitor and the peripheral device being used. Restart the computer.

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