Shop to repair LCD TV

My LCD TV is on the fritz. Many horizontal lines appear on the screen and stay there for an indeterminate time (a few hours, one day, a few days) and then disappear. The TV stays problem-free many days and the problem starts again.

I’m pretty sure this is electronic issue since a problem with the screen itself wouldn’t come and go like it’s doing. And since the problem is electronic, I’m hoping it’s a simple component that can be replaced.

Does anyone know where I can get someone to look at my LCD TV?