Great ma ma- first of all if the tv was dropped,then there is a good chance that the pc board was damaged most likely a small crack near the audio section.This sort of repair is probably better left to someone with very good soldering skills. If you think you know someone,let me know I can help. cooltek Feb.15/08
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To enable close cationing on your TV follow this:-
 Press "Menu" button on the remote control to appear "Setup" menu on the screen.
 Use "Up and Down" arrows on the remote contol to select "Captions/Text" on your screen.
 Press "Right or Left " arrows to select any one of the following options. Caption-1, Caption-2, Caption-3, Caption-4 Text-1, Text-2, Text-3, Text-4.
 Press enter to return TV viewing.
To turn the caption feature to "On" or "Off'
 Press menu key on the remote control to display "Setup" menu.
 Using "UP/DOWN" buttons to select captions on your screen.
 Press "Right or Left" arrow to switch the captions feature 'ON" or "OFF" or "EZ Mute"
 Press enter to continue.
The dark rectangle appears because you have the closed captions on and set to TEXT. Closed captions set to CC1 puts the words on the screen and TEXT puts a black box on the screen. Go into the menu, navigate to the page with closed captions and set your captions to OFF.
Closed captioning isn't broadcast on every channel and program, so the information may not be present. Since captions are displayed on other channels, you know the set is working properly. If you are on a cable system you can try asking their customer service people if they know anything. But the TV is fine.
You have the closed-captioning turned on and set to "text" mode. It's easy to do on Zeniths because many of their remotes have on button just to control the captioning. Go to the caption settings and turn it off or set it to "caption" mode if you want to use it. Then the box will be gone.
(What's happening is that in text mode, the screen is blanked out in the area where the text would go, but there isn't any text being sent by the station. On channels where no captioning at all is used, the box never shows up.)