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Go into your settings of the TV menu or there will be a single button on the JVC remote marked "CC" for closed caption. Press it or in the menu turn off the "TEXT" mode. With the text mode on you are allowing the TV to display text information wich means usually a black rectangular box that appears on the screen with no text in it. Usually on the cc button just press it until it scrolls through turning off the CC or text modes.
civilman, the first set has either no high voltage or is collapsed vertically, until someone checks for high voltage there is no concrete answer, the AV27730 is vertical collapse from your description, either the voltage to the vertical IC is missing or the vertical IC has failed, not a big deal cost-wise, hope this answers your questions, if not e-mail me back, good luck, BMW Rider
If you mean that you get a black box, with a little of the picture visible around the edges, then your closed captions are on and set to TEXT. This puts a black box on the screen about 10 seconds after changing the channel. Go into the menu and turn off the closed captions and the picture will be back to normal.