@mazino that will depend on what causes those lines. You are not giving us enough information to help you a whole lot. This sounds like a panel error and would be expensive since it is next to impossible to replace the LCD, but unless we can see if it will only be a guess. Post some images of what your screen displays with your question. Use this guide for that [guide|21499|commentid=417084] Also, and this is very important. What is the exact model of your TV.