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Check all the solder terminals at its video output card;[CRT base card]. Check the soldering of the CRT base socket. A dry solder joint or an open color output transistor can cause this fault; provided the picture is there. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
The fault is technically called 'one color predominant screen'. Use this keyword to search the site.
It sounds like your picture tube is either shorted at the blue gun or there is a blue drive problem. The blue driver transistor can short and cause the same problem. If it has little fine white lines as well, most likely it is the tube. Thanks for using fixya.
If you can get the tv to display the blue blackground(usually happens when there is no antenna or cable feed to tv) check to see if the whole screen is a solid blue, if it shows discolored areas around the screen then you might have to "demag" the screen. See if you can rent a demad coil from a tv shop and with tv on turn the coil in circular movements all over the front of screen till blue is solid.good luck!