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It most likely has bad solder connections in the horizontal sweep circuit. Re-solder the horizontal drive transformer, the horizontal output transistor, and the flyback transformer, and everything in between. The flyback transformer is the large transformer with the big red wire coming out the top. The horizontal output transistor is a large transistor that is fastened to a metal heatsink close to the flyback transformer. The horizontal driver transformer is a small transformer with one terminal connected to the "base" terminal of the horizontal output transistor. You could also have bad solder connections in the vertical output and power supply circuits. I wouldn't use it until I resoldered the horizontal output circuit because loose connecions here will eventually cause the horizontal output transistor to short, which will burn up parts in the power supply.
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