Hello
I've got a Panasonic TV model TX-29AS10F chasis EURO-4H with a color
purity problem at both sides of top of the picture. Top left has a
greenish tint and top right is yellowish, the rest is correct
including top middle. That discoloration gets worse as nearer to the
edge. This model is 100Hz and has a completely flat CRT front.

In the user settings it has a geomagnetic correction menu that lets
the user rotate the picture slightly, the curious thing is that
adjusting that also moves that purity defect. The right one can be
eliminated completely this way but then the left one expands even
more. The opposite is also true but the left one can't be corrected
completely.

I wonder if you belive it is more probably a CRT mask defect, a moved
or misaligned yoke or some missing/fallen magnets. I don't see
anything wrong apparently in the yoke but before I start playing with
small magnets around the tube or moving the yoke I ask for previous
experiences.

Thank you.