LG 42LC6DF Owner's Manual page 75

mm_ Press the VOL or VOLUME button.
mini Sound muted? Press MUTE button.
mini Try another channel. The problem may be with the broadcast.
mmff Are the audio cables installed properly?
mini Adjust Balance in menu option.
mmff A change in ambient humidity or temperature may result in an unusual noise
when the product is turned on or off and does not indicate a fault with the
product.
mini Adjust resolution, horizontal frequency, or vertical frequency.
mini Check the input source.
,ruff Work the Auto configure or adjust clock, phase, or H/V position. (Option)
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