Lcd tv is displaying picture but no sound what so ever, it is completley silent

I know you've already checked this but to be thorough I am including it: make sure no one pressed the mute button on the remote. Try another channel and make sure it is not just one or two. If it is only one or two channels sap may have been enabled and needs to be disabled by pressing the audio or mts./sap button on the remote. Try playing a dvd, vhs cassette tape, or video gaming system to see if you can get sound on another input. If you still do not get sound on another input then you know it is the television. If you have the television connected to a cable box or satellite receiver and it is a dvr then unplug it for 30 full seconds to reboot it. You can unplug the television for 1-2 minutes to try a basic reset.

If nothing gets sound back on the television it may need to be rebooted from the service menu. We would need to know what brand and model number.