LG 25UM56-P Owners Manual - English - Page 30

Troubleshooting

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ENEGNLGISH 30 TROUBLESHOOTING TROUBLESHOOTING Nothing is displayed on the screen. Is the monitor's power cord plugged yyCheck if the power cord is correctly plugged in to the power outlet. in? Is the power indicator on? yyCheck the power cable connection and press the power button. Is the power indicator displaying ? yyCheck that the connected input is enabled (Menu - Input). Is the power indicator blinking? Is the "OUT OF RANGE" message displayed? Is the "CHECK SIGNAL CONNECTION" message is displayed? yyIf the monitor is in sleep mode, move the mouse or press any key on the keyboard to switch the display on. yyCheck if the computer is turned on. yyThis 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. yyThis is displayed when the signal cable between the PC and the monitor is missing or disconnected. Check the cable and reconnect. The screen retains an image. Does image sticking occur even when the monitor is turned off? yyDisplaying a still image for a prolonged time may cause damage to the screen, resulting in the retention of the image. yyUse a screen saver to protect the screen when using the monitor for a prolonged period of time. NOTE yyVertical 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. yyHorizontal 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.

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30
ENG
ENGLISH
TROUBLESHOOTING
TROUBLESHOOTING
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 power outlet.
Is the power indicator on?
y
Check the power cable connection and press the power button.
Is the power indicator displaying ?
y
Check that the connected input is enabled (Menu - Input).
Is the power indicator blinking?
y
If the monitor is in sleep 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 CONNEC-
TION" 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 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 hori-
zontal cycle. This is called horizontal frequency and is represented by kHz.
NOTE