I am having the same problem on my 52" LCD (see link for pictures). I think it is a cold solder joint on the tunner. I am going to re-solder any cold joints I can find. Happends when it gets a little warm like when the sun is shinning in my living room.
http://www.fixya.com/support/t406239-52_sharp_lcd_getting_snowy_picture
Check tuner or replace it
You could have a bad spitter or a fitting could have come loose.First thing to do is to take another TV set right next to the bad TV set and plug in the cable to the other TV set to see if the same issue happens. If it does there is a cable issue. If it does not have a snowy picture, then you should call the store where you purchaced the set for exchange or service. Good Luck
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are lcd tvs more sensitive picture quality wise then older tv's
On all channels I get a snowy picture but all other tv's in the house are fine
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