Troubleshooting - LG M4224C Owner's Manual

G Is the product power cord connected?
G Is the power indicator light on?
G Power is on, power indicator is blue but
the screen appears extremely dark.
G the power indicator amber?
G Does the 'Out of range' message
appear?
G Does the 'Check signal cable' message
appear?
'Unknown Product' message appears when the product is connected.
G Did you install the driver?
G The 'Key Lock On' message
appears when pressing the Menu
button.
* Vertical frequency: To enable the user to watch the product display, screen image should be changed tens of times
Note
every second like a fluorescent lamp. The vertical frequency or refresh rate is the times of image display per second.
The unit is Hz.
* Horizontal frequency: The horizontal interval is the time to display one vertical line. When 1 is divided by the
horizontal interval, the number of horizontal lines displayed every second can be tabulated as the horizontal
frequency. The unit is kHz.

Troubleshooting

No image is displayed
' Key Lock On' message appears.
• See if the power cord is properly connected to the
outlet.
• See if the power switch is turned on.
• May need service.
• Adjust brightness and contrast again.
• Backlight may need repair.
• If the product is in power saving mode, move the
mouse or press any key.
• Turn both devices off and then back on.
• The signal from the PC (video card) is out of the
vertical or horizontal frequency range of the
product. Adjust the frequency range by referring
to the Specifications in this manual.
* Maximum resolution
RGB : 1920 x 1080 @ 60 Hz
HDMI/DVI : 1920 x 1080 @60 Hz
• The signal cable between PC and product is not
connected. Check the signal cable.
• Press the 'INPUT' menu in the remote Control to
check the input signal.
• Install the product driver, which is provided with
the product, or download it from the web site.
(http://www.lg.com)
• See if the plug&play function is supported by
referring to the video card user manual.
• The Lock function prevents the OSD settings
from being changed inadvertently. To release
the lock, go to Menu and Option and disable
the Key Lock option..
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