I have a JVC AV-27820 27" television. Has worked perfectly for about 4 years. Now the entire screen is blask except for a very thin line across the center of the screen. You can see in the thin line that the images are still there behind the black, and the sound is fine, but it just looks like the screen 'collapsed' down to the one line. I tried the vertical and horizontal controls but nothing changes. Any ideas on whta swrong and what part to fix?

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