I have a 37" LG hdtv... I have noticed this week thatwhen I watched espn in hd... There seems to be flickering black lines across the screen form time to time. I even noticed it on fox in hd the next day. I get no such lines when I'm watching any other hd channel. I doubt its my TV, but I am curious if anone else has experienced this or not.
Again, Only happens while watching sports on espn hd and on fox hd... seems to go away after awile. Why would this only be during a sporting event and not a movie channel?

Sounds like a signal issue to me. I'd call the cable operator. If it's OTA HD, you might want to check you antenna direction. Antennaweb.com helps with direction.

I don't think its ota.. its from comcast... See what I'm not comprhending is... If it's a signal issue, why don't I get the same problems watching say HBO in HD or any other HD chanel not dealing with sports??