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your captioning or "text" is on. usually inside the tv menu. if not its your cable or dish box has captioning on. black box usually means its in text mode instead of CC thus the black box rather than text
Go into the TVs menu and look for the closed captioning menu. Someone has inadvertantly selected the "teletext" mode. Since no broadcaster s currently using this feature, when a false signal is encountered by the TV, it throws up the black box that would contain the text data. Turn off the text function and enjoy more of the picture!
there should be 3 sets of video rca jacks on tv or receiver they might have put them on the wrong rca jack in which they just need to be moved over
usually the 3rd set of rca jacks are component jacks not for tv or video but for low output signals say like cameras and only one set of rca's can be used at a time svg on one of them rca's will over power the vid's. so have no picture
hmmm...the black square syndrome..sounds like the picture in picture settings are unhappy..check those, to see if maybe it's on some sort of timer, and accessing a non channel(which might explain the black square).
Go into your customer menu to closed caption and turn off the "text" mode... What you're seeing is a text box from closed caption but unless you have that additional service it will just me a black square...