Troubleshooting
RL15H User Manual, 99144, March 2017
25
Symptom
Causes
Solutions
"Scanning Ports / No
Signal" message box
and no image on the
screen
Video cable is not plugged
in correctly�
Check the video cable connection at
the monitor, PC, and/or KVM extender.
PC is not powered on�
Ensure PC is powered on�
PC is not sending signal.
Connect PC to another known working
monitor to check the PC source signal.
"VGA / Out of
Range" or "DVI / Out
of Range" message
box and no image on
the screen
The source signal exceeds
the maximum resolution
and/or refresh rate that the
monitor can handle
( > 1024 x 768 resolution
or > 75 Hz refresh rate)�
Adjust the computer settings to the
monitor's native resolution:
1024 x 768 @ 60 Hz
Incorrectly displayed
or partial image on
the screen
Monitor has not been
adjusted correctly for the
source signal.
• Activate "Auto setup" function in
the OSD's "VGA Settings" menu.
This function may also be activated
by pressing the Select [ SEL ]
button outside of the OSD menu�
• Fine tune the picture by manually
adjusting the image using the
settings in the OSD menu.
Analog signal is not a
standard CVT signal (this
does not apply to digital
signals).
Disable the "CVT Mode" function in the
"Advanced Setup" menu located in the
OSD's "Setup" menu. This allows the
monitor to use the controller board's
internal mode table to display signal.
Wrong or abnormal
colors (white is not
white)
Monitor color settings are
incorrectly adjusted�
Reset monitor to the default settings
by activating "Reset to factory defaults"
function in the OSD's "Setup" menu.
Video cable is not securely
connected�
If any colors (red, green, or blue) are
missing, check the video cable to make
sure it is securely connected�
Video cable is bad�
Ensure no loose or broken pins in the
cable connector� Shorts in cable could
also cause improper image to display.
Screen image is dim
Brightness and/or contrast
settings are not set
properly�
Adjust the monitor's brightness and/
or contrast settings found in the OSD's
"Picture" menu�