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The foldover is usually a problem with a solder connection in the horizontal driver stage or on the flyback itself. These tend to burn off connectors on the flyback to PC board.
Also, these sets were very prone to safety cap (the four lead cap near the horizontal output transistor) failure. Hopefully the end will pop off when it fails, disconnecting the horizontal output transistor and killing high voltage. Also, if the horizontal output transistor is running hot (check the temperature when the set is off or it may be quite a surprise) don't run it too long or it will kill the new transistor.
If the four lead cap is bad, be careful replacing it with a two lead of the same value. Some caps can't handle the load placed on this capacitor and open with catastrophic results. If the new cap gets warm, try another type, not just a different brand but a different composition.
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