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it seems like the green was not defective before you replaced the green. remove the red =no change in the screen color, that could be bad. put back red, then remove blue=screen color changed, blue is good, hope you got the idea.
The problem seems like it is the optical block. When the optical block goes bad blurs will begin to develop on the screen, possibly in the a blue /green or purplish color. Once it begins it will only get worse and replacing it is expensive and impractical since you can get a better television for less money than the parts. Repair is an option, but it is only a short term solution to a problem that lies with poorly made parts that will inevitably fail again. If you are interested in repair check with your local TV repair company, or search eBay and craigslist for advertised optical block repair.
Do you normally leave this set on a specific channel...such as CNBC or BLOOMBERG tv...etc that maintains a regular scrolling image???
If so...on sets that are a few/several years old...the projection tv screens can develop what's called a "burn" or "burned image" on the screen...similar to wearing a path in your carpet from heavy traffic areas. Newer models do not have this issues...but many older ones do.
This is the first sign of a failing Red Picture Tube. Tubes will blur to the right when they get older. You can try to turn the screen control for the red gun down so the blur goes away. But eventually it will get worse.
Not sure what causes it but it can be fixxed by your local repair guy, I just had mine fixxed for under a hundred bucks, he takes the back off and with a tiny screw driver adjust a few screws to near brand new perfect picture.. and it has been good ever since
It is not a bulb. It is a picture tube. If there are thin blue lines across the entire screen, not just the edges, and the picture itself looks too blue, it means that the blue picture tube is being driven too hard. This could be because the blue screen voltage is too high, the boost voltage on the blue picture tube is too low, or the video output is leaky or shorted. If the picture has what looks like blue arcs and double images on one or more sides of the picture, it means that one of your convergence IC's has burned out and needs to be replaced. These are things that should be tested and serviced by a qualified tech, so allow an experienced tech to handle it for you.