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Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---
Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.
Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.
This can be corrected. You will need to use caution. Pull the back cover off. You will see a flyback transformer. You will note, that a suction cup is connected to the back of the picture tube. Follow the red lead and you will see the flyback transfomer. You will also see, two potentiometers on this transformer. The top knob will correct the focus you are talking about. The bottom knob will increase or decrease the voltage to the picture tube. Just work with the top pots. It will say focus on the knob. Turn back and forth as you watch the lettering of an informational program. This will be helpful. Thanks for asking and show all hands of support!
If you wish to get some details; visit the site linked here. Pull up older posts. https://electronicshelponline.blogspot.com/
faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts
This is a convergence problem that you can fix if you can solder. Let me know if you wish to attempt the repair and I'll post additional details and instructions.
Your convergence chips and convergence resistors are going bad. When they fail the screen colors will look distorted/3d looking. Another symptom is one or more colors can't be converged using the convergence menu. You can purchase the parts over the internet. Just make sure you get Sanyo brand convergence chips and the correct flame proof resistors. You can also check the site www.TvRepairKits.com for a kits. Just make sure you replace both of the convergence chips and all of the convergence resistors.
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