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There is an apparatus on the back of your picture tube called a yoke.This distributes your picture on your pic tube uniformly.If this or the circuits enabling it malfunction,then you will get distortion-namely an hour glass shape.Tv has to be trouble shooted.
Hopefully it is only a board component that needs replacing and your dry joints that need re-doing. I would advise that you take it to a television repair shop as this type of repair can be very complex (replacing resistors and capacitors just to name a few).
I regret to tell you that he is probably right. The problem is the trinitron picture tube. Sony advertised it with such high esteem for years and wouldn't doubt that they would do that. The phospher is burned out in the tube and the guns (red, green and blue) are weak and the focus electrobes in the tube are also weak although Sony made it a lot different that any other tube requiring extra circuitry. There is no fix for this. If you could bypass the blacking out you would still have the bad out of focus picture problem
The hi voltage cable a red wire with gray cup that its attached to the picture tube needs to be sealed , that can solve the problem. 40.00 dls depending on the tech . dangerous to do without the knowledge ,picture tube need to be discharge before, try to seal to avoid accidental hi voltage discharge . if you need more help let me know
I would try adjusting the screen control on the flyback. The flyback can be easly located, find the red wire attached to the top of the picture tube & follow it down to the flyback. on the flyback you should find two controls, one screen & one focus. you sould be able to read the words above each control, only adjust the screen one. slightly increase the control till the picture stays on, if you turn it too much you will get small white lines going across the screen. Now if what i have told you fixes the set, then it is only a tempoary repair. could last days or mothes, maybe years. if it starts to happen again later the set will have to be replaced. this is a sign of the picture tube starting to get a weak. ALSO DO NOT PLAY WITH THE RED WIRE IT CARRES VERY HIGH VOLTAGES EVEN WHAN UNPLUGGED FOR DAYS.