The LCD on the Samsung TV sounds like it's dying. It will either have to be fixed, or you will have to buy another TV. If it's under warranty and you didn't do any physical damage to the TV and it just started doing this by itself, then you should be covered.
In my experience with TVs breaking, I've never had just the LCD break. You can look up what it might cost, take that number and estimate around how much it would probably cost. I've seen on average, LCD screen repair costs go from $300 to well over $500. Depending on your current situation, it might be best to just buy a new TV.