Sharing our solution to this problem:
We had a black square that appeared in the middle of our TV screen and we couldn't figure out how it got there. It seems that our closed caption was turned on to the text mode. To make the black square disappear all we had to do was go to the menu and select closed caption and change it from text mode to off.
All better! The kids must have been pressing buttons again!
Thanks for posting this solution, it really helped solve a mysterious issue with the unexpected black square in the middle of the screen. I must of rolled over on the remote when I fell asleep and changed the display to closed caption, thanks again.
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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..?
Go into your customer menu to closed caption and turn off the "text" mode... What you're seeing is a text box from closed caption but unless you have that additional service it will just me a black square...
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.
If a black square appears on the screen and you can see the picture around the edges, it means that the closed captions are on and set to "TEXT". Go into the TV's menu, navigate to the closed captions page and set the captions to OFF.