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Troubleshooting - NEC MD21GS-3MP Installation & Maintenance Manual

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Troubleshooting

No picture
• The signal cable should be completely connected to the display card/computer.
• The display card should be completely seated in its slot.
• Check the power switch should be in the ON position.
• Computer power switch should be in the ON position.
• Check to make sure that a supported mode has been selected on the display card or system being used.
(Please consult display card or system manual to change graphics mode.)
• Check the display and your display card with respect to compatibility and recommended settings.
• Check the signal cable connector for bent or pushed-in pins.
Power Button does not respond
• Unplug the power cord of the display from the AC outlet to turn off and reset the display.
• Check the power switch on the top of the display (portrait) or side of the display (landscape).
Image Persistence
• Please be aware that LCD Technology may 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. Unlike CRT monitors, LCD monitors' image
persistence is not permanent, but constant images being displayed for a long period of time should be avoided. To alleviate image
persistence, turn off the monitor for as long as the previous image was displayed. For example, if an image was on the monitor for
one hour and a residual image remains, the monitor should be turned off for one hour to erase the image.
NOTE: As with all personal display devices, NEC-Mitsubishi Electronics Display recommends displaying moving images and using a
moving screen saver at regular intervals whenever the screen is idle or turning off the monitor when not in use.
Message "OUT OF RANGE" is displayed (screen is either blank or shows rough images only)
• Image is roughly displayed (pixels are missing) and OSM warning "OUT OF RANGE" is displayed means the signal clock or
resolution is too high. Choose one of the supported modes.
• OSM warning "OUT OF RANGE" is displayed on a blank screen: Signal frequency is out of range. Choose one of the supported
modes.
Image is unstable, unfocused or swimming is apparent
• Signal cable should be completely attached to the computer.
• Check the display and your display card with respect to compatibility and recommended signal timings.
• If your text is garbled, change the video mode to non-interlace and use 60Hz refresh rate.
Display image is not sized properly
• Check to make sure that a supported mode has been selected on the display card or system being used.
(Please consult display card or system manual to change graphics mode.)
• Check the EXPANSION MODE in the OSM.
No Video
• If no video is present on the screen, turn the Power button off and on again.
• Make certain the computer is not in a power-saving mode (touch the keyboard or mouse).
No Tilt
• Rotate the screen to 90˚ clockwise until you hear one click.
• Refer to the Display Adjustment and Mounting section to insure correct installation of stand.
NO OSM
• Refer to the OSM LOCK OUT function in the Advanced OSM section of this manual.
English.17
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