LG 42LC7D Owner's Manual (English) - Page 81
Picture OK & No sound, Sound muted? Press MUTE button.
UPC - 719192171145
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The audio function does not work. Picture OK & No sound I Press the VOL or VOLUME button. I Sound muted? Press MUTE button. I Try another channel. The problem may be with the broadcast. I Are the audio cables installed properly? No output from one of the speakers Unusual sound from inside the product I Adjust Balance in menu option. 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. There is a problem in PC mode. (Only PC mode applied) The signal is out of range I Adjust resolution, horizontal frequency, or vertical frequency. I Check the input source. Vertical bar or stripe on background & Horizontal Noise & Incorrect position Screen color is unstable or single color I Work the Auto configure or adjust clock, phase, or H/V position. (Option) I Check the signal cable. I Reinstall the PC video card. APPENDIX 79