Here are some images, all with good fine tuning, for reference. I was not able to find an image of bad fine tuning, but it is essentially what you are seeing. All three pics show a standard "Indian Head" test pattern.
Normal picture with test pattern
Picture with normal fine tuning, but sync is floating. (You have floating sync, but it's probably due to the poor tuning, not due to a sync circuit failure.) Note the dark horizontal and vertical sync bars.
Picture with normal fine tuning but horizontal hold (H) control or horizontal frequency control is misadjusted
