I have daewoo model CTS 2090. The color picture is great except there is
a black rectangle (approx 12'' x 5') covering part of the lower half of the picture. This happens even when I am watching a DVD, so I figure it's the TV.
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The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv .
the black rectangle appears as soon as the channel indicator goes off. someone has turned on the closed captioning in the menu of the set. it is in the "text" mode. go into the menu and turn off the closed caption feature.
somehow your closed captioner has been turned on and within that the text option has been turned on. If theres a menu button on the front of the tv you can navigate with the menu button and either the volume or channel buttons to select options and then navigate to closed caption and turn it off. If you dont have a menu button you will have to get a MID priced universal remote which will have your menu button programmed within it, some newer directv remotes have the menu function, you can go to radio shack and tell the guy there your problem and he will will most likely set you up with the proper universal remote which will enable you to shut that off.
there is a broken conductor strip or broken solder joint on the circuit board near the power input jack. do this:
1.) disconnect tv and open panel to expose circuit board.
2.) using a flashlight and magnifying glass, look carefully for this broken solder strip or solder joint. Flex board slightly if necessary to aid in finding the break.
3.) repair it using solder iron and flux solder and scratch copper conductor slightly to aid in "wetting" the solder fix.