Question about Samsung LN-S4041D 40 in. LCD HDTV

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Green and purple dots waving on screen

I have green and yellow dots that float around and wave on the screen of my TV. I have had the TV for a year and a half when the problem started. I had a technician come out and he did not know what was causing the problem. He reset the TV with a code that he typed on the remote. The problem went away for a month and a half, but now it is back. Do you know what is wrong with the TV or do you know the code so that I can try the reset again.

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