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Check the main output voltage (B+) from its SMPS regulator side. If this voltage is lesser than normal, picture won't fill the entire screen. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. http://electronicshelponline.blogspot.com/ Pull up older posts.
you have to make sure that if you are using external/additional speakers that you keep them away from console. I had a similar problem when I install a surround sound system in by bar and one of the speakers was very close to the TV. A good friend of mine walked in and said "if you want to get rid of that picture problem and save the life of the TV you had better move that speaker." It has to do with the magnets in the speakers.
This is a pin cushoning fault. The failure is in the pin amp, and also most likely in the scan amplifier sections. The scan amps and pin amp in part of their functions work together to control the paralax of the picture scanning. They also control the dynamic focus.
To service this, you will need the training, service information, the testing tools, parts availability, and the necessary tools to follow up.
These types of faults can be complex to service, and can be a chalenge to even an experienced tech.
Your problem is a bad main B+ capacitor. The right way to find this would be with a good ESR type capacitor meter. If you do not have an ESR cap. checker or do not know how to use a cap. checker. a local repair shop should be able to assist you in this repair at a decent price. Let us know what you did to get this set fixed?