Owners manual

49
Troubleshooting
y
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.
● 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 : 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.
● Is the power cord connected?
● Is the power indicator light on?
<M4225C>
● Power is on, power indicator is Blue
but the screen appears extremely dark.
<M3704C>
● Power is on, power indicator is Green
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?