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The blue is caused by the RGB gun alignment. Green is a fixed gun and Red and Blue are adjustable. In my Mitsubishi, the guns are motorized and can initially be adjusted (course) with the remote. There are more detailed adjustments that can be made if you purchase the service manual. I paid approx $19.00 on line 3 years ago and it is a complete manual. Unfortunetly I don't remember the site. To do a complete alignment, there are steps to take: starting with entering a code using the remote to enter the setup. To make a long story short, I had my tv aligned 3 or 4 times over 5 years under the extended warranty. After watching the tech, who was good, but under time constraints, it was clear that most anyone could do it if they could read and follow instructions.
Unfortunately you will have to replace the convergence board in this unit. it has failed. this particular board regulates the alignment procedure that you are having issues with. replacing this board will fix this issue.
this tv will need some testing to determine the exact cause but most likely it will need a conversion done, you will need to call your local repair shop to come out and fix the problem
sorry about your tv
I would recomend getting the service manual at the following link as if you change the wrong item you can actually harm the set often real bad. The following link will email it to you within minutes of purchase and will offer free tech support to help you with it. heres the link http://servicemanuals.vstore.ca/