If the line is horrizontal then the fault is in the vertical deflection circuit.
It is not worth repairing an old CRT monitor, unless you have electronic
knowledge. I do not recommend repairing CRT monitors yourself, because
there are dangerous high voltages inside these monitors, even though the
unit is unplugged from the main outlet. The CRT tube will hold high
voltages for weeks even though the monitor is turned off.
I suggest you put your money towards a LCD screen, they are inexpensive.
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