LG 55LH400C Owner's Manual page 111

Press the VOL or VOLUME button.
Sound muted? Press MUTE button.
Try another channel. The problem may be with the broadcast.
Are the audio cables installed properly?
Adjust Balance in menu option.
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 Check HDMI cable over version 1.3.
mini Check USB cable over version 2.0.
mini Use normal MP3 file.
*This feature is not availablefor all models.
Adjust resolution, horizontal frequency, or vertical frequency.
Check the input source.
Work the Auto configure or adjust clock, phase, or H/V position. (Option)
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