NEC MultiSync EA190M User Manual page 14

OSD Warning
OSD Warning menus disappear with Exit button.
NO SIGNAL: This function gives a warning when there is no Horizontal or Vertical Sync. After power is
turned on or when there is a change of input signal, the No Signal window will appear.
OUT OF RANGE: When input signal is non-supported timing or the video signal doesn't have proper
timing, the Out of Range menu will appear.
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