NEC M861 86" UHD 4K HDR Commercial Monitor - Manual (Page 80)

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Screen Image and Video Signal Issues
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 main Power Switch, it should be in the ON
position.
• Make sure both the computer and monitor are powered
on.
• Make sure that a supported resolution has been selected
on the display card or system being used. If in doubt,
please refer to the user’s manual of the display controller
or system to change the resolution.
• Check the monitor and your display card with respect to
compatibility and recommended signal timings.
• Check the signal cable connector for bent or pushed-in
pins.
• The monitor automatically goes into standby at the
preset time period after the video signal is lost. Press
the power on button on the remote control or press the
⏻ button on the monitor.
• If you unplug the signal cable when starting the
computer, images may not be shown. Turn off the
monitor and the computer and then connect the signal
cable and turn on the computer and the monitor.
• Check the [OPTION POWER] setting when you use
Option Board accessories.
• Check for HDCP (High-bandwidth Digital Content
Protection) content. HDCP is a system for preventing
illegal copying of video data sent over a digital signal.
If you are unable to view material via the digital inputs,
this does not necessarily mean that the monitor is not
functioning properly. With the implementation of HDCP,
there may be cases in which certain content is protected
by HDCP and might not be shown due to the decision/
intention of the HDCP community (Digital Content
Protection, LLC).
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, the image persistence of monitors is not
permanent, but a single still image being shown for a
long period of time should be avoided. To alleviate image
persistence, put the monitor into standby via remote
control or turn the monitor’s main power off for as long
as the previous image was shown. For example, if an
image was on the monitor for one hour and a residual
image remains, the monitor should be in standby or
turned off for one hour to erase the image.
NOTEN: As with all personal display devices, we recommend
showing moving images, using a moving screen
saver, or changing still images at regular intervals
whenever the screen is idle, or putting the monitor
into standby or turning it off when not in use.
The image is blinking
• If you use a signal repeater or distributor or a long
cable, this may cause image roughness or blink for a
moment. In this case please connect the cable to the
monitor directly without using a repeater or a distributor,
or replace the cable with a higher quality cable. Using
a twisted pair extender may cause image roughness
depending on the environment where the monitor is in or
the cable you are using. For further information please
ask your supplier.
• Some HDMI cables may not show a correct image.
If input resolution is 1920 x 2160, 3840 x 2160 or
4096 x 2160, please use an HDMI cable which is
approved to support 4K resolution.
• When inputting 8K signals, use a DisplayPort cable with
the 8K logo.