51
Troubleshooting
● The 'Key Lock On' message
appears when pressing the Menu
button.
• 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.
●
Did you install the driver?
No image is displayed
'Unknown Product' message appears when the product is connected.
'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 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: 1600x1200 @ 60 Hz < M3204C >
1920x1080 @ 60 Hz < M4716C >
HDMI/DVI: 1920x1080 @ 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.
● Is the power cord connected?
●
Is the power indicator light on?
<M3204C>
●
Power is on, power indicator is
Green
but the screen appears extremely dark.
<M4716C>
●
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?
• 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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