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Sounds like T'Con board fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Liquid Crystal Display - LCD There is a Flo recent light that shines behind the screen. This light is what passes through the window or LCD when the shades are open or partly opened. Think of each colored individual LCD (pixel) as a Window Shade. You have pixels that are made up of 1-red, 1- green and 1-blue light shade. Your main control board will tell each light shade how much/far to open each colored light shade so it will make the color it needs to. If the shades are closed (black) if the shades are all open (white) Hope this helps.
The red, blue and green are ONLY the Video outputs, and connect colour to colour, now, there are Two other connections, again coulor to coulor, usually red & white, that hook up to the Stereo INPUT. So you need BOTH sets to work IE: The Video & Audio.
Video: Blue, Red, Green.
Audio: Red & White.
That would be my solution. The trouble is either in the box or your connecting cables. Verify this by connecting the cable directly to the set. Then try a new set of connecting cables, or call the cable provider to replace the box.
Just respect the colors. Green output from the dvd to green input tv, Red output from the dvd to red input tv and the same with blue. All 3 cables (green , red, blue) are for the picture, so you got to plug another 2 for the sound.