LG DM2350D Owner's Manual page 111

ꕢ Digital broadcast cannot be seen though the cable is connected.
• Verify subscription and/or signal with cable operator.
(Depending on the subscription, digital broadcasting may not be supported.)
ꕢ Display is not on or unclear when connected to HDMI.
• Check the HDMIⓇ cable specifications. Failure to use genuine HDMIⓇ cable may
cause images to fade in and out or not be displayed properly.
• Verify that all cable connections are securely connected. When connections are not
secure, images may not be properly displayed.
ꕢ Does not work when connected to USB storage device.
• Verify that the USB device and cable is version 2.0 or higher.