LG 42LD400 Owner's Manual - Page 44
Video Problems, PC Mode Problems, Check High Speed HDMI cable.
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Video Problems Lines or streaks in pictures No picture when connecting HDMI r Check antenna (Change the direction of the antenna). r If an HDMI cable doesn't support High Speed HDMI, it can cause flickers or no screen display. In this case use the latest cables that support High Speed HDMI. Audio Problems No output from one of the speakers r Adjust Balance in menu option. Unusual sound from inside the product r 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. No sound when connecting HDMI/ USB r Check High Speed HDMI cable. r Check USB cable over version 2.0. r Use normal MP3 file. *This feature is not available for all models. PC Mode Problems The signal is out of range r Adjust resolution, horizontal frequency, or vertical frequency on the PC. r Check the input source. Screen color is r Check the signal cable. unstable or single color r Reinstall the PC video card. When connecting the HDMI cable to the PC, there is no audio. r Check the manual for the video card in the PC to see if it supports HDMI audio and how to set it up properly. APPENDIX 44