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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..?
The child managed to press the button on the remote that controls closed-captioning, and now the TV is set for "text" mode. I don't remember if the button says "caption" or "cc", but it's one of those or something very similar. Press the button again to go through the settings until you get back to "off" and the box will be gone.
What's happening is that in text mode, the TV blacks out the area where the text would go. If there isn't any, the result is that mysterious black square. It may not show up at all on some channels, or only during some programs. It depends on whether captioning is being broadcast. Since many TV remotes have a single button to control caption settings, it's easy to get into this mode without realizing it. But it's easy to fix.
your closed caption is on, this might be set on the cable box or the tv, look in the audio or set menu. If you dont have the remotr you should be able to navigate the menu on the tv with the onset controls
Try goeing into your Menu and see if you have the closed Caption on
that will produce a black box on the screen if you have the owners manual look in there,if you don't have it you can go on line and download it from the manufactures website under Downloads
Good luck Walter Grzybowski