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Hello, it sounds like you have a short in the power supply, this is very common and shouldnt be too expensive to repair. Get a few quotes and pick the best. Approximately $150- $250 depending on what the fault is. By the way, its not usually the screen. If they tell you it is, get a second and third opinion. I hope I have helped.
You definitely have bad solder grounds. I have repaired a few of these. You will need a TV tech pull the boards out and resolder them. The worst board would be the one on the left [signal board, has rca jacks. rf connector]. And they may as well solder the second board. You will have a restored TV when completed. Thanks for asking and show a few hands of support!
What channel is it and when they tune in that channel, is the picture nice and clear or is it grainy and snowy before the screen goes blue? On some sets, if the signal is weak, the picture will go blue. This is called Blue Screen and is there so you do not see very poor, grainy and snowy pictures. Some sets will have an option in the menu to turn the blue screen off.
Actually, your description indicates that the blue gun in the tube itself is shorting out. This happens when the set has been on for a while and the metal parts in the CRT guns have heated up and actually contact each other. If the video output transistor is bad then your screen would be blue right from the start. An easy way to prove it is to monitor the voltage of the blue pin on the picture tube socket. It should measure around 150 - 175 volts. When the screen starts going blue you will see that voltage drop dramatically. Quickly pull the CRT board off the picture tube while watching the voltage on the blue pin. If the voltage jumps back up the instant the socket is removed, your picture tube is bad. There are CRT rejuvinators that have the "remove short" function, but that has about a 50% chance of success and I usually find that the short will return a few months down the road.