There’s a dynamic convergence problem with this set. The
colours are correct at the centre of the screen. The top lefthand side is all green however and the bottom red, the righthand side being the same but with the colours reversed. The
colouring tends to vary with the brightness.
The most likely cause of this would seem to be a defect
associated with the horizontal R/G symmetry coil L905 on
the convergence panel. There must be d.c. continuity, since
the line scan current flows through this coil. Try setting it
up, and if this fails fit a replacement.