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Sorry to tell you this, but that's one symptom of a bad picture tube. After it's warmed up a little, one of the elements in the neck touches something it shouldn't and you see the result. There's no repair except a new tube, and that's completely uneconomical. It would be less expensive to replace the set.
The unit has lost its green video information. This can be a picture tube or a green drive problem. The only colors you are getting are red and blue thus the purple picture. All picture tubes have red, green and blue guns to make all the colors needed for a normal picture. It will take some troubleshooting to determine whether it is a drive problem or the picture tube itself. Have a repair shop check it out for you. A 36" TV is worth a check out fee. Thanks for using Fixya. Let me know how it goes.
I believe you have lost the green channel leaving only the red and blue. It could be an internal connection like a solder joint or connector, or it could be component failure from the CRT to an adjustment pot. Being the set is ten years old it wouldn't be worth spending a lot of money on it. You can buy a 27 inch TV now for almost what a repair would cost. If the picture was very good before this probem you may try to get it fixed cheap. Otherwise it probably wouldn't be worth it.
My 27 inch TV's (A Sony and a Sharp) are pretty old and I would fix them myself if the picture tube was very good.
This may be a very good time to buy considering the discounts being offered. ;-)).
You may have placed something with magnets near the bottom of the TV screen. Magnets will distort the electron beam in their vicinity. Move whatever you have there!
"de- gaussing" is the process of de- magnetising the shadow mask in the tube, it occurs automatically at switchon.
If removing magnets/ relocating TV / switching on and off does not fix the problem, it's time for professional intervention.
in that tv you have surely the color circuit trouble - if you can you have to check the red color circuit , first transistors then voltage or a capacitor not functioning , I HOPE THIS MAY HELP YOU - DELFO