Troubleshooting Touch Screen Video Problems

If you are experiencing display problems (no video, no horizontal or vertical synchronization, non-linearities, etc.), remember that the video function of the display and the Elo touchscreen installed on the display are separate systems. Therefore, problems with the display should be treated as display problems, not touchscreen problems. Diagnostic procedures and possible corrections for display problems should be performed using the troubleshooting procedures outlined in your display manual.

Usually, the simplest approach is to try a known good monitor and/or try the suspect monitor on a known good computer. Also, check all cable connections and available monitor controls.

• For Windows systems, you should check the screen resolution and refresh rate (to do this in a no-video situation, you will have to connect a working monitor to the system).
  • Control Panel
    • Display
      • Settings tab
  • The Screen Resolution is generally shown on the left side, center of the window. It can be changed by sliding the arrow left or right in the box.
  • Compare the resolution with the supported resolutions in the monitor specifications (on this site, see Products, select by monitor size, select monitor model number, scroll down to Resolution specifications).
  • Note that LCD monitors have an optimum screen resolution.
    • They will not display a resolution higher than the specified resolution.
    • They will display lower resolutions, but the video quality will be diminished.
• Also, check the Refresh rate.
  • Click the Advanced button on the Settings tab.
    • Select the Monitor tab.
    • The Screen refresh rate should be displayed at about the middle of he Window. Other refresh rates can be selected by clicking the arrow at the right of the drop-down box.
  • Compare the refresh rate with the Hz part of the resolution specifications. Use the drop-down box under the Screen refresh rate to try other refresh rates.
• If these settings do not correct the problem, and if power and cable connections are OK, then the monitor is probably defective.

• Check the resolution specifications for the monitor to make sure that it is capable of displaying the desired resolution (on this site, see Products, select by monitor size, select monitor model number, scroll down to Resolution specifications). 
• Make sure that your computer or video card supports the desired resolution (see documentation for your computer or video card)
• Make sure that the drivers for your computer or video card are up to date (consult the computer or video card manufacturer's Web site)

Older LCD monitors are not capable of the interpolation required to make a lower video resolution fill the screen. That is, only the optimal resolution will fill the entire video display area; lower resolutions will display as a reduced video area. The only solution is to upgrade to a newer monitor.