I have a toshiba tv that is only a few years old and it has started to show a black box in the center of the tv that comes and goes. It covers most of the tv but there is about a 3 inch border of the screen that still shows. The sound is fine and if you turn the channel it stays fine for a few minutes then the black box appears again. If you turn the volume higher or lower the black box disappears for a few minutes then returns.
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I had the same problem too! My moms friend open the tv and adjusted a few cables and it doesn't turn black no more. The problem is that the cables that are use to show the program move around and the get out of place. You can either do it yourself but it might be risky unless you have experince or you can take it to a tv shop
I have heard complaints from some of my customers, “There is a black/gray box on my television, but I can still see the picture around the edges”. This happens to all of us and is a common symptom and can be fixed very easily. If you have a black/grey box in the picture, on the older sets they would be perfectly centered on the screen, but, on some of the newer sets the black/grey box can be in different places and can be different sizes on different sets. Most likely the Text mode is on in the Closed Caption menu. The way you can test if it is in Closed Caption Text mode, when you change the channels, the black/ gray box will not appear right away but it will take some time to show back up. This is a very good indication that the Closed Caption “Text” mode is turned on for your television. It just needs to be turned off. To turn off the closed caption go into your menu and turn off closed caption (CC). This will vary from manufacture to manufacture; it should be in the options menu. I have seen on some sets like Mitsubishi puts it under the Video adjustments button. So you may have to look around for it. You may even have a CC button on your remote, which will make it much easier. Just press the CC button until the display indicates that CC it is off. I hope that this tip helps you and that you enjoy your televisions for years to come. Thanks for using FixYa asnowman
go into your menu and find closed caption, someone has accidently set the closed caption mode to text, when the on screen display of channel or volume goes away the box appears. turn off the closed caption feature or switch it to something other than "text" mode, and your box will go away.