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As an "expert" service tech, I'd say the flyback/horiz output transistor is bad. Also check the 2 big power diodes for shorts in the power supply. They're mounted side by side on ferret tubes next to the switchmode transformer, and fry anytime the fly goes. And also check the solder connections very closely on the small coil next to the horizontal output transistor. They're prone to have bad joints.
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