I work at at a school, and we had the same problem. Turns out, it a Closed Captioning problem.
We found the manual, and it states that "If a large black box covers 80% of your screen, the Text mode is probably set. Press 'Closed Caption' to turn it off." The "Closed Caption" button is on the remote. If you don't have the remote (as in our case), you can go to "Closed Caption" in the menu, and pick something like C4 and T4. That stopped the black box for us.
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My JVC television has a black box appear on it every time I turn it on and it goes away for a few seconds every time I adjust the volume it will disappear for a few seconds two to three. Then it will go back to the black box on my screen. Pleas help Im thinking about buying a new T.V., but would like to avoid the purchase if there is a quick fix.
There is this black square that blocks most of the picture on the tv. It will disappear for a few seconds and sometimes for a couple of minutes then it comes back. I had this same problem about 15 years ago with another tv while living in new york but I can,t remember what I finally had to do to correct the problem. Also, it does not do it on all channels, just on some.
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