FWIW: My TV had been plagued by pixelation for several months. I called Verizon and they sent out a serviceman who replaced the insides of the ONT located on the side of my home. At first I thought the problem was fixed but several days later I was seeing pixelation on some of the HD channels such as History and the Smithsonian channels. With the help of an intercom (cordless phones) and my wife I located the problem at the 4 way splitter which had beel placed outside the house by Comcast 16 years ago. I found a replacement 4 way splitter at Radio Shack and replaced the old one and haven't had a recourrence since. In fact, the quality of the picture has improved greatly.
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