I believe there is a problem with my cable jack on the back of my tv. I use the cable from the wall directly to the cable jack on the back of my television. Certain channels are clear and other channels are blurry. The channels that are blurry seem to be lagging. I believe something is wrong with the tv's cable jack. Has anyone repaired this before on the Samsung LCD TV Model: LN40A530P1FXZA?