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Loose connections are a suspect. Try tapping the board with the insulated handle of a screwdriver and see if you can make the problem act up. If that does not work, try spraying parts on the PC board with freeze spray. Otherwise, you may have to obtain a schematic and trace the circuit with a scope and/or multimeter to find the problem.
While you've got it apart, resolder the horizontal drive transformer. That's the little transformer connected to the base pin of the horizontal output transistor. This transformer is bad to have loose connections and can take out the HOT as well as the power supply.
That set is probably worth spending a little time on if the CRT is still strong. Those mid '90's sets seem to be a little better than the current cheap CRT junk.
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