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I don't know what model of Sony you have, nor am I familiar with the circuits on Sony sets, but your set sounds like it has a pincushion correction problem. In solid state sets this is usually a function of one of the combo IC's, related to deflection-generation, or video. I wouold go looking for the problem there, particularly a problem with electrolytic capacitors. It probably is not any of the IC's that are bad. Beware if you suspect an expensive part! Also, are there any menu driven adjustments possible. At the extreme end, this may be a deflection yoke problem.
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