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The easiest place to start is with the vertical deflection coils (the ones on the neck of the CRT) - check them for continuity with a multimeter. If they're good, then I'd start looking for open or shorted resistors. A complete lack of deflection means a total failure somewhere...
Someone with a service manual might be able to point you in a more specific direction, but this is usually a good start for anything of this age. The carbon resistors tend to go high when exposed to a lot of moisture and cause all sorts of problems.
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