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it could be you have pressed the old teletext service button, look for a button with 3 lines on it in a box and press it or try turning the tv off at the plug then back on again.
You`ve mentioned that ON CERTAIN CHANNELS THE TV WORKS FINE, so your trying to say that not all channels THE BLACK SQUARE APPEARS IN THE MIDDLE O THE SCREEN... my be that black square is generated from the broadcast center. may be your unit is good. let me ask you how many channels that your tv works fine..?
your captioning or "text" is on. usually inside the tv menu. if not its your cable or dish box has captioning on. black box usually means its in text mode instead of CC thus the black box rather than text
If the picture can be seen on the sides of the black square you need to go to the menu and find the text and turn it off
Usually in the closed caption section
I have a Sharp Tv that had the same problem with a large brownish or black square right in the middle of the screen. It only left about an inch around the edges that you
could see the picture moving in behind the big black block or square.I have DISH sat-elite and the book recomending that I check and see if the "caption settings" were on
or off. They were on. I turned the caption settings off and the large square diappeared.
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