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I agree on the STK chips! Indeed you can still have good center convergence because the chips are only for dynamic convergence. The center is done by the rings on the CRT necks, thus still good even with the dynamics off altogether. In your photo, the convergence chips are the two large heat-sinked ones facing you just to the left of the jack panel. Also you might check all those electrolytic caps for leakage/dryout. They can cause the chips to overheat and fail, and also the caps themselves can cause convergence issues. I don't know why the engineers put them right next to the chips, which normally get hot and cook the nearby caps.
There are probably also fuses or ICP devices in the B+ feed to those chips. Check for open. I got rid of all my later Sony manuals, so I can't look or I'd tell you where the ICPs are located. Usually 2 for each chip. There's a -35 and +35 volt supply typically to each chip, and that's where the fuses or ICPs are. Could also be glass fuses in the power supply (G-board in that model???).
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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