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The flyback has to be at least usable for the screen to light.
Change out of tolerance resistors in the horizontal (AFC/osc/output) section, and see what that does. If yours has SS AFC diodes and not tubes then it is the later version of the chassis, and the hold control should be a potentiometer. There is also an adjustable horizontal oscillator coil/transformer that should be adjusted with a PLASTIC (never use a metal hex key, you will crack the core if you do) alignment tool...Try adjusting that osc. coil for a good synced picture, and then centering the hold control and readjusting the coil.
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