Need help.

Pls help me with my SOny KV20M10C. It only has sound, but no picture(blank screen) what i can see is only trace lines(RGB). Previously the problem is a vertical fold over image at the top, when it is turned-ON you can see only the trace lines and it took so long for the image to appear clearly. had encountered this before but without the trace lines only blank screen. The unit turned OK after the screen voltage was adjusted(2yrs ago). But now had tried adjusting the screen voltage and i can only see trace lines. even the channel or volume display are not visible. Best Regards

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