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If it runs all the way from top to bottom, will not go away, and perhaps flickers or vibrates, it is quite possibly a symptom of a faulty LCD panel. Attach a second display using the auxiliary display port on the rear. If the white line does not show up on this display, your main LCD panel is faulty.
Main LCD panel replacement on this model is not a difficult job for a certified tech. The panel can be had for $80 used (17" screen; other sizes may vary).
Your Bulb is DUE, you need to change it, Don't do it your self contains mercury. Your LCD is good IF you do not have bad PIXELS. This white and pink lines shows as pixel problem but it migth also short on LCD, if you placed something heavy on Laptop. You may remove and sent the LCD for repair or all laptop to tech.
You may also need to check inverter. I give service around the Country but it is up to you. My company name is JMC TECHS INC. Registered in Miami Florida. (Check SUNBIZ.com) jmctechinc@gmail if you like to contact me.
Your vertical deflector circuit is going out. This is really not economical to repair, the chip alone is $12-15 plus if you have any other parts in the circuit going out plus labor. You can pickup 17" CRT monitors for less than $15 from goodwill or craigslist.
Sorry to say but I think its time to retire your 753s
You have a failure in the vertical deflection circuit. This could be either a bad vertical chip, the power supply that runs the chip or a bad capacitor in that circuit. This is usually a repair best left to a professional. There is a small possibility that it could be bad solder connections. If genlty tapping the unit temporarily solves the issue you can try and resolder the pins on the vertical chip LA7841 is the part number. There is also a resistor 1 ohm 1 watt. If that resistor is open you can assume the IC is bad