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It has lost vertical deflection, probably because the vertical output IC has failed (assuming there are no dry joints on or around the vertical output IC/yoke connector/flyback).
Replace the vertical output IC (probably a LA7838/LA7841/LA7845 or similar) and associated electrolytic capacitors. The vertical IC is usually powered by a winding on the flyback transformer via a fusible resistor and diode. If the original IC failed shorted it may have taken these out as well.
Many sets will blank the CRT under these conditions to prevent burning a line into the screen. Someone may have turned the screen control up (hence the dim lime) when fiddling.
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