Is this a CRT type. Please mention where the white line is and if this is the retrace line all across the screen horizontally then it is failure of the grid filter which is a high voltage capacitor in the section of the line output normally about 10-25 MFD/250V. Also the failure of the diode or the fusible resistor opening out will result with the same symptom.
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Is this a CRT type. Please mention where the white line is and if this is the retrace line all across the screen horizontally then it is failure of the grid filter which is a high voltage capacitor in the section of the line output normally about 10-25 MFD/250V. Also the failure of the diode or the fusible resistor opening out will result with the same symptom.