What you have is a "Blue Light Special"...Cheap devices,of almost any type, often emit spurious electrical noise. You can purchase an in-line filter and attach it in series with your TV coax cable immediately prior to your TV. This only works if the noise is entering from the cable; Sometimes the noise enters from a marginal component within your TV. You can alternately purchase a toroid core that functions by wrapping the TV coax cable around the core several times. The theory is that RF noise "rides" on the shield of the coax and is absorbed by the material within the core. Or, better yet still, turn off the blue light and make your on mood enhancer....martini, perhaps?