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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.
Go into your setup menu and turn off closed captioning. The box is there for some channels even though no text is being sent. If you need to keep the closed captioning, try selecting a different mode for it.
This type of problems and some OSD problems are occurs due to microprocessor over modulation. One option is there. That is if you have any child lock or keypad lock or frontpanel lock. First locked the system. Now check your problem arise. If it is not OK. Otherwise try to find nearby any radio frequency cable across in your tv. keep away that cablewire also. your problem solved. Even you get Call your nearst service provider..