LG 23CAT42K User Guide

Nothing is displayed on the screen
Is the monitor's power cord plugged in?

 

y

Check if the power cord is correctly plugged in to the outlet.

Is the power indicator on?

 

y

Check the power indicator.

Is the power indicator displaying as 

white?

 

y

Adjust the brightness and the contrast.

Is the power indicator blinking?

 

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.

Is the "OUT OF RANGE" message 

displayed?

 

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 appropri-
ate frequency.

Is the "CHECK SIGNAL CABLE" 

message is displayed?

 

y

This is displayed when the signal cable between the PC and the moni-
tor is missing or disconnected. Check the cable and reconnect.

The "OSD LOCKED" message is displayed.
Is the "OSD LOCKED" message 

displayed when the MENU button is 

pressed?

 

y

The OSD lock feature is enabled to prevent undesired modification 
of the OSD settings. Press and hold the MENU button for a couple of 
seconds to unlock the OSD. (The "OSD UNLOCKED" message will be 
displayed.)

The screen retains an image.
Does image sticking occur even 

when the monitor is turned off?

 

y

Displaying a still image for a prolonged time may cause damage to the 
screen, resulting in the retention of the image.

 

y

Use a screen saver to protect the screen when using the monitor for a 
prolonged period of time.

 

y

Vertical Frequency: In order to display an image, the screen must be refreshed dozens of times per 

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.

 

y

Horizontal Frequency: The time it takes to display one horizontal line is called the horizontal cycle. 

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.