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Fault with vertical scan output section circuit. That's why you see a horizontal line across the screen. {vertical scan absent]. Check and replace damaged component/s at its vertical scan output section circuit. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to CRT screen are given with illustrations. You can get an idea about the fault to an extent.
That might be an issue with the TVs picture tube if it was not one of the LED or LCD TVs. Please get a technician changed it. If it was any one of the LCD or LED TVs, then it would be more expensive than you expect.
If there is no picture and 3 vertical lines in the center of the screen, stop. Turn off TV. You have no horizontal deflection happening. Lines will burn into crts and be permanently visible after repair.
No horizontal deflection is caused by Horizontal sweep circuit failure, maybe flyback transformer and associated components. More than a simple do-it-yourself repair.
You have a bad vertical output IC or a bad capacitor(s) in the vertical driver or output circuits. Not a job for the user to do unless you have the proper tools as well as a service manual. Good Luck
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