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Question: horizontal bars top to bottom rolling replaced A& SC boards

When I first turn on tv it`s fine After about 10 minutes it has about 3 inch bars that run from left to right on the screen and from top to bottom constantly rolling. I`ve replaced the A and SC boards. The service guy that I didn`t have to replace the upper and lower buffer boards.Problem still there . I have a video of it if required.Thanks pete