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Try website like Remotes.com to buy the tv original remote to used.U will used the tv original remote to turn to channel 3 with ease.After u have the tv original remote push the menu button go into Closed Captioning functions turn off like TEXT 1,2,3...The big black box will not appear on the screen again.Tv used it manually control buttons up and down channels trying to get to channel 3.U will never get it to tv channel 3 because tv channel 3 was not save on it memory list of on the tv turn manually channels buttons programming memory.Tv have a manual button said MEMU button on it tv front bazel frame?Yes.Might could used the Menu button on the tv frame to get in to turn off TEXT 1,2,3...to stop the big black box to show up on the tv screen again.
Check the set up. You may have closed captioning turned on which will show up as a black box if there is no closed captioning information for the selected channel. If that fails to resolve the problem, update this.
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.
shut off close caption. use the CC button onthe remote or go in to the menu and change close caption to CC1. this box is the close caption in TEXT(1,2) which will put on a black box whenever there is caption present.