Trouble with lines on a JVC TV

I bought a JVC TV Model #AV-32F802 in 2001. Recently we have noticed that while we are watching cable or DVD's, the top 1" area has little white lines that show up. They do not distort the overall picture but are just annoying. What is wierd is that while my children play their Playstation 2, the lines do not appear.If we play a DVD through the PS2, the lines appear again, just as they do in the regular DVD player or through the cable box. Is there a way to adjust this or will it be too expensiveto fix? Please let me know if this sounds familiar or you may know what may be wrong. Thank you

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