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If it's normal television, with CRT picture tube . then it's Blue gun which went off normally its a solid state circuit which can malfunction. which is located at the back neck of picture tube blue gun out put circuit a transistor or a resistance of 470 K or 390 K Ohms can blow off. or the tube base can loose contact with the blue gun pin.
I had a television that went to a bright shade of blue.A friends neighbor worked for sony television plant where the new tubes came down the assembly line.His job was to make sure tubes were working fine,if one color was dominant then his job was to smack the front center of the tube with a rubber mallot to fix the problem.He suggested i try that with my tube while the set was on.It worked and solved my blue problem.Apparently he explained,the gun connections in the tube came loose and to fix it was to smack it this caused the connection to reweld itself.For you I would use the palm of an open hand and smack the tube dead center with a good hard smack.Dont be afraid of breaking the glass because its very thick and strong.Give this a try.Hope it helps.Good luck!
Very common problem on your model. you have a bad blue tube. in order to repair it you will need to replace the blue tube and then aligned it to the others. you will need to know a little about what you are doing. if you are interested in doing this yourself i will need a serial number off the back of the set to get you the right part number for the tube. This tube is going to cost you somewhere between $200-$300. To get this tube in there and looking right is a little of a fine art, I can walk you through this though. Let me know what you want to do!
You could do it but you would need the service manual to be able to do the tube and lens alighnment. You have to align the tube and lens before you can adjust convergence, and if you dont alighn properly you will kill your convergence ICs trying to compensate. If you would like me to post a link where you can get the manual let me know.
Sounds like you have a problem with the blue gun in your picture tube or its drive circuit.
You might remove the back cover and gently tap on the neck of the picture tube using a plastic
screwdriver handle while watching the screen in a mirrow. If the picture flashes back on or on and off then the picture tube is the problem.
If this is a projection tv you have three separate tubes : red, green & blue.
you'd need to tap the blut one.Gently!!!!