NotTaR of Television Sets : Red, green, or blue retrace lines       
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Red, green, or blue retrace lines

Where only one color is showing, suspect an incorrectly adjusted individual background/bias control or bad part on the CRT neck board for that color.

There is a slight possibility that a bad CRT may result in visible retrace lines. To eliminate this possibility:

See the section: Bad CRT causing retrace lines.

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