Does the TV have a grounded 3 prong plug?
lift the ground pin with one of those hardware store grounding adapters. (3 to 2 pin power plug adapter)
Do the lines go away?
Disconnect the inputs to the TV , leave just one input connected. Do the lines go away?
any time you have more than one ground connected to the TV, you can get lines. It's called a ground loop.
The TV cord does not have a ground prong nor does it remove from back of TV like my 42" Samsung