My lcd tv isn't working properly. when I turn it on the sound is not loud as it was and it losses sound in a minute. Every time I try to turn it up the sound fades. The sound is very scratchy. Another problem is that when I try to change the input to my dvd player, it blank. Im a very high tech person and I just don't know what the case is. I think its having to do with something inside the tv. It would not even let me process channels. Let say I try to turn it to channel 3, it will just say unusable signal. The cable cord is connected properly. What should I do?