Grundig TV CUC 1852
 

I have this Grundig M72-105 IDTV chassis CUC1852 which shows very
symmetrical color distortions mainly in the top corners of the CRT.
The distortions are of a rainbow moiree type and very pronounced.
Using my external degausser does influence the picture but when the
degausser is switched off, the old phenomen reappears unchanged.

The TV set works fine, I am thinking about a defective mask in the picture
tube
Tube data is TOSHIBA A68KZN696X99

Is there any further information on this problem ?

TIA

--
Bram
....If you want to grow old as a pilot, you have got to know when to push it,
and when to back off...(Free to Chuck Yeager)