LG 26LH1DC4 Owners Manual - Page 102
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APPENDIX The audio function does not work. Picture OK & No sound No output from one of the speakers A Press the VOL + or - button. A Sound muted? Press MUTE button. A Try another channel. The problem may be with the broadcast. A Are the audio cables installed properly? A Adjust Balance in menu option. Unusual sound from inside the product A 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 (Invalid format) A Adjust resolution, horizontal frequency, or vertical frequency. A Check the input source. Vertical bar or stripe on background & Horizontal Noise & Incorrect position A Work the Auto configure or adjust clock, phase, or H/V position. (Option) Screen colour is unstable A Check the signal cable. or single colour A Reinstall the PC video card. APPENDIX 100