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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..?
Check your closed-caption settings and be sure it's turned off. Captions have gotten turned on and set to "text" mode, and the set is blanking out the area where the test would go. This often happens if someone presses the button on the remote that controls caption settings without realizing it.
meknow is right I think. To turn off your closed captioning hopefully all you need to do is get into the setup menu. You didn't list what kind of TV you have so this is a generic solution. Go into menu and in a setup menu there will be a closed captioning way to select to turn the box off.
The reason sometimes you see it and sometimes you don't is because some programs have closed cationing and some don't.
And because you are only seeing a blank box and not closed captioning is because there are different closed captioning standards. CC1, CC2, etc.
So if you can find the menu item that allows you to turn off the closed captioning, it would be a good start to solving your problem.
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.