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When your TV cuts off, does just the video cut off or do you lose all power? Does the power light stay on? If the power light goes out, I would suspect a bad solder connection in the power supply, or maybe a defective capacitor or two in the regulation circuits. If just the video is going to black screen, it could be your picture tube getting weak and the cathode current monitoring circuit is kicking in preventing you from seeing a sub-par picture. Sometimes this can be temporarily adjusted out by a very small amount of tweaking of the screen control located on the CRT drive board, but it is easy to get a shock and hurt yourself if you're not familar with the set. The CRT can sometimes be restored for a bit more life with a CRT tester/rejuvinator that the service Tech has access to if that is what is causing your symptoms.
Your problem is not a vertical alighnment or size adjustment. No, Im sorry to say its the old vertical output IC and /or the small capacitors around the ic and in the vertical circuit. If you dont have the right tools, like a soldering iron a multimeter know how to read a schematic diagram, then you should seek out a repair person to assist you in this repair.