Mitsubishi WS-65869 65" blue color problem

Your blue picture tube is failing. Invest in a new TV. "If" you can find a new set of tubes(you have to replace all 3 red blue and green) they are around $800-1000. Not cost effective. Run the TV into the ground if you want to wait but do not invest any repair money in my opinion.

the problem is on the cables , look on the back of the cable box , if it is hd box the on ly thing you need to do is put the cables base on there colors green with green , red and blue , the other 2 are for video , but if it is normal box just put the yellow color with yelow on your box to your tv and the other to are audio

The problem - you're setting the convergence settings, but you're not saving them, you're
simply exiting the menu screen. Be sure to save your convergence setting for each
of the three colors. It sounds like you're setting RED last, and not saving its convergence setting,
whereas the GREEN & BLUE are holding their convergence settings, since you're saving them
correctly before proceeding on to RED....

its sounds like the convergence on your TV needs to be adjusted. (this adjusts all of the color guns in the back of the tv to line them up again, when they get off, you start to get yellow blue or red halos around objects in the picture. In the setup menu on your TV under picture or Display there will be an item that says "convergence" follow the instructions in there so all the crosses on the screen no longer have colored halos anymore.

this tv is fix

no your optic block is going south u need a new light engine big bucks

convergence ic's are your culprit. they are responsible for aligning the 3 colors your tv projects onto your screen..

Sounds like you may need a blue CRT. Can you look in the rear of the set and tell if the blue CRT is lit up?

call tech and suggest to balance your screens ..they will know the procedure.

Adjust convergents for blue.This is done with your remote control. go into menu, setup, instructions will come up on screen, also in manual.