Troubleshooting - LG 24GM77 Owner's Manual

34

TRoUbLESHooTING

TRoUbLESHooTING
Nothing is displayed on the screen.
Is the monitor's power cord plugged
in?
Is the power LED on?
Is the power on and the power LED
displaying white?
Is the power LED blinking?
Is the oUT of RaNGE message
being displayed?
Is the No Signal message being
displayed?
The oSD Lock message is being displayed.
Are some functions not available
when you press the Menu button?
The screen retains an image.
Does image sticking occur even
when the monitor is turned off?
Screen display is unstable and shaky / Images displayed on the monitor leave shadow trails.
Did you select the appropriate reso-
lution?
NoTE
Vertical frequency: In order to display an image, the screen must be refreshed dozens of times per
y
second like a fluorescent lamp.
The number of times the screen is refreshed per second is called vertical frequency or refresh rate
and is represented by Hz.
Horizontal frequency: The time it takes to display one horizontal line is called the horizontal cycle.
y
The number of horizontal lines displayed in one second can be calculated by dividing one by the
horizontal cycle. This is called horizontal frequency and is represented by kHz.
y Check if the power cord is correctly plugged in to the power outlet.
y Confirm there is power available at the AC plug by plugging in a lamp
or another electrical device.
y Check the power cable connection and press the power button..
y Check that the connected input is enabled (Menu - Input).
y If the monitor is in power-saving mode, move the mouse or press
any key on the keyboard to switch the display on.
y Check if the computer is turned on.
y This occurs when signals transferred from the PC (video card) are
out of the horizontal or vertical frequency range of the monitor.
Please see the Product Specification section of this manual to set
the appropriate frequency.
y This is displayed when the signal cable between the PC and the
monitor is missing or disconnected. Check the cable and reconnect.
y The OSD is locked. Go to Menu > Settings and set oSD Lock to Off.
y Displaying a still image for a prolonged time may cause damage to
the screen, resulting in the retention of the image.
y To extend the lifetime of the monitor, use a screensaver.
y If the selected resolution is HDMI 1080i 60/50 Hz (interlaced), the
screen may be flickering. Change the resolution to 1080P or the
recommended resolution.