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NotTaR of Television Sets : Retrace lines in picture
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During the time the electron beam is returning from right to left at the end
of a line and bottom to top (over the course of multiple lines), it is supposed
to be result in no visible light on the screen. However, a number of faults
can result in visible retrace lines.
The appearance will likely be a general reduction in contrast from the visible
horizontal retrace on every scan line and two dozen or so diagonal lines lines
(lower left to upper right) resulting from the vertical retrace.
The retrace lines may be either white or gray (possibly with a slight color
tint due to unequal settings of the color adjustments) or a primary color -
red, green, or blue. Anything in between is also possible but less likely.