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Thank you for posting your question on Just Answer! I will be happy to help you with this problem. Can you please give us some more information so I can better answer your questions.
-How old is the unit?
- Do you have this problem while watching all different devices hooked to this television? (DVD player, cable, satellite, game counsel, ect.)
Please give me this information and I will be happy to assist you further.
It is 3 year old.
I only have this problem while watching cable i.e. it is not there while I watch DVD's.
do you have a cable box or does the cable come straight out of the wall into the tv?
I solved this myslef: switched input from cablebox to the TV from "component" to "TV".