Hi, this may be an obvious question but have you done a Google search with that question. There may be YouTube videos with an explanation of the problem and hopefully what can be done to repair the TV. I had a Samsung Plasma 50" TV that started getting "Sharpie Marker pen" thin lines across the screen. I found at least one video that showed what parts were needed to repair the TV, and how to do it. I took the opportunity to just buy an LG 55" OLED TV, and stored the Samsung TV away "for just in case scenarios".😊 Good luck, and since the TV was a gift. You might want to just live with the problem until the TV dies, or like me, you just buy a new TV.👍😉