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In many many cases this is an indication of a failing picture tube. The gun assembly in the neck of the picture tube is shorting. There is a fix, but this is surely last resort and the final cure may not provide a fix. Picture tube rejuvenation is not always successful. I would certainly opt for a new TV. Thanks for asking, and show a few hands of support!
These procedures are from the owners manual, go into menu and then picture quality and then:
The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’
images are precisely aligned, they create the color images you see on the screen.
Over time, the picture can drift out of alignment (this is normal). If your picture
seems fuzzy or has a yellow tint, using Convergence could correct this
misalignment. Only one convergence is needed for all inputs, regardless of the
Note: Make sure the TV has been on for at least 30 minutes (TV needs to
warm up for best results) before starting Auto Converge or Red/Blue
When you select the Convergence feature, a submenu appears with three options:
Auto Converge Automatically aligns the projection lenses to self-correct
color images. You’ll see flashing squares of color dance across the screen
(this is normal).
Note: After performing auto convergence, use the Blue Centering and
Red Centering menus to fine tune convergence in the center of the
screen, if necessary.
Blue Centering Aligns the blue and green images to fine-tune the picture.
Red Centering Aligns the red and green images to fine-tune the picture.
Note: The ability to change channels is disabled when adjusting the
convergence options. The TV must be tuned to a usable signal to
converge the picture.
On the back of the TV, to the right of the I/O panel, there are 2 vertical slot shaped openings on a raised bit of the plastic case. Behind the lower slot is the screen adjuster. Using a phillips screw driver, turn the adjuster clockwise to increase the brightness. Behind the upper slot is the focus adjuster.
The core problem with the green tint is the aging of the picture tube, and can be compensated a bit by using either the green drive control usually located on a printed circuit board on the neck of the picture tube or on the main chassis. There will be 3 main controls which will adjust the red and blue as well. If these controls are not present then you will need to get into the service menu and adjust it from there. Don't adjust anything else as you can make the set much worse. Also remember that in order to make these internal adjustments while watching a black and white picture (turn the color all the way down) you will have your hands and arms near live circuits that could shock you and cause injury to yourself as well as break parts inside the set when you pull back after being zapped (voice of experience here) Of course if you can do all this by the service menu then you won't even have to remove the back of the TV.
The problem with the set is that the blue gun has gone weak, and not emitting at par with red and green guns in your picture tube. Turn of the blue screen and get the grainy display on the screen (detach the cable) and enter into service mode to fine tune until you get a perfect or black and white grain pattern.