HI, i am having a problem with my JVC TV. It is model # AV 27D302. I have had it for many years and never have had a problem. What is happening is the TV turns on and off and works properly, however after the channel number goes off the screen a black box appears on the lower half of the screen and stays until you change the channel or volume. Then it comes back again. What is the problem? Lindsay, MD

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