LG 19LD350 Owner's Manual page 117

mm_ Press the VOL or VOLUME button.
i,i,i S ound muted? Press MUTE button.
mini Try another channel. The problem may be with the broadcast.
i,i,i Are the audio cables installed properly?
i,i,i Adjust Balance in menu option.
i,i,i 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.
Check HDMI cable over version 1.3.
Check USB cable over version 2.0.
Use normal MP3 file.
*This feature is not available for 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)
Check the signal cable.
Reinstall the PC video card.
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