I just connected up a LG, model 47LS4500, LED and noticed all the HD channels were displaying too wide and cutting off part of the picture. I finally figured out the problem was with the "HD Zoom" setting on the Comcast Xfinity DVR box. You can see the HD Zoom button near the bottom on the Comcast Xfinity remote control. Pushing this button let me see the entire picture on the HD channels. Hope this helps someone else new to HD channels.
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