Troubleshooting - LG M4720C Owner's Manual

● Is the power cord connected?
● Is the power indicator light on?
● Power is on, power indicator is Blue
but the screen appears extremely dark.
● Is the power indicator amber?
● Does the 'Out of range' message
appear?
● Does the 'Check signal cable'
message appear?
'Unknown Product' message appears when the product is connected.
● Did you install the driver?
● The 'Key Lock On' message
appears when pressing the Menu
button.

Troubleshooting

No image is displayed
'Key Lock On' message appears.
• See if the power cable 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 set 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 set. 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 set is not
connected. Check the signal cable.
• Press INPUT on 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 control locking function prevents
unintentional OSD setting change due to
careless usage. To unlock the controls,
simultaneously press the Menu button and
►button for several seconds. (You cannot set
this function using the remote control buttons.
You can set this function in the product only.)
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