SOURCE: screen has color. but no picture.
Unscrew the cable off the cable box on the out to TV end, then screw it back on. You may also try a different type of cable, like HDMI or component cable.
SOURCE: I have a Sony KDLW3000, the picture has colored vertical lines on the whole screen,
The Tcon board is usually at fault with that symptom. You can get a replacement Tcon from www.tvrepairworld.com
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