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No vertical is usually the vertical IC and some capacitors connected to it. The caps cause the IC to run hot and fail. A sure sign caps are bad, once the IC is replaced is a foldover at the top of the screen.
I remember that I had to add to the heat sink to keep the IC alive. Apparently towards the end of that IC's popularity, seconds were being sold. I had the same trouble with Zenith power supply IC's when the sets with all the shorted CRTs came along. The seconds always ran HOT!
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