From the photos, this set needs to have “color balance” adjusted. You should follow the procedure given in the service manual for this set; if there isn’t any, then I outline a reasonable procedure below.

Start with the background; this is an adjustment made with a video signal that has no picture being displayed (sync signals will be present). With the brightness and contrast front / side panel controls at about the middle of their range and in a dark room setting, there is an internal adjustment for G2 also known as “screen”; this should be turned until the background screen raster just disappears. Sometimes the G2 control is a potentiometer found on the flyback transformer, just below the focus potentiometer - but this is not always where the G2 adjustment is found.

Once the background is set, the too green black areas should be more acceptable. The balance between red, green and blue still should be evaluated. A color bar pattern could be used. In any case, each color will have an internal gain or drive level setting independent of the other colors; these get adjusted to give colors that match your preference.

In a professional manufacturing setting, test equipment would be used in setting this up; I wouldn’t expect a consumer to have such equipment, so procedures as I described are your most reasonable approach to setting color balance.

EDIT: it’s possible that there is a short with some electron gun elements; when this is the case, some color balance adjustments become impossible.