LG SAC34173302 Owner's Manual page 107

mm_ Press the VOL or VOLUME button.
mini Sound muted? Press MUTE button.
mini Try another channel. The problem may be with the broadcast.
mini Are the audio cables installed properly?
mmff Adjust Balance in menu option.
mini 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.
Adjust resolution, horizontal frequency, or vertical frequency.
Check the input source.
Work the Auto configure or adjust clock, phase, or H/V position. (Option)
Check the signal cable.
Reinstall the PC video card.
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