33 | CHAPTER 5 – TROUBLESHOOTING
Troubleshooting No Picture on the Screen
To troubleshoot
no picture issues
1. Turn off the LCD monitor, turn off the interactive display, and then turn off the
computer.
2. Disconnect the video cable (Usually VGA) that connects the interactive display’s
bottom terminal panel to the computer.
3. Check the video cable for bent or pushed-in pins. If the cable is damaged, replace
it.
4. Install the video cable between the interactive display’s bottom terminal panel and
the computer.
5. Turn on the computer, turn on the interactive display, and then turn on the LCD
monitor.
6. If the screen still doesn’t display an image, there could be an issue with the
computer’s display card. Ask someone with knowledge of display cards to confirm
the following:
– Is the display card correctly installed in its slot?
– Is a supported mode selected on the display card or system? For more
information on changing Graphics modes, consult the documentation
supplied with the display card or system.
– Is the display card compatible with the interactive display?
For additional troubleshooting suggestions, see the NEC MultiSync S521 User’s
Manual (document 145185).
Troubleshooting Persistent Image Issues
LCD technology can experience a phenomenon known as image persistence. Image
persistence occurs when a residual or ghost image of a previous image remains
visible on the screen. Although image persistence on an LCD monitor isn’t permanent
(unlike CRT monitors), you should avoid displaying images on the screen for a long
period of time.
TIPS
To reduce the risk of image persistence:
• Display moving images at regular intervals whenever the screen is idle.
• Turn off the interactive display when it isn’t in use.
• Activate a screen saver for your operating system.