I have a JVC AV-32050 its 10 years old. I have never had any problems with this tv until now. NOw I needto use a digital converter box to see the channels. I don't have any cable or satelite. And now a big black square is coming out covering most of the picture. When I turn off the digital converter I can see some local channels. I thought it might be some kind of block. But even when I put a dvd movie it is doing the same. when I turn it on or change the channel the square goes away for a second or two but then comes back. I have tried to remove it through the menu options but it won't come off. Please help.

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