Toshiba Television. When the T.V. is turned on, there a thin line going horizonal across the front

Question

When the T.V. is turned on, there a thin line going horizonal across the front of the T.V., no picture will come in,  unless you are constantly  hitting the front of the telelvision and the picture pops in.  there is always sound. need someone that works on this problem in my area, I live in Bloomington,  ILL.