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My computer screen has a vertical white line running from top to bottom

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If it's there all of the time, but you can still see your desktop and programs - chances are it's a monitor screen defect. Dell had this happen on some laptops and was replacing the defective flat panel screens. Borrow someone else's monitor or take it to a friends house that will let you hook it up to their computer monitor. If the problem goes away - then it's your monitor screen.

Posted on Jul 07, 2009

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Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
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1 Answer

Jvc av-29ts2ek


It sounds like a vertical deflection problem. You mentioned you had a white HORIZONTAL LINE in the middle of the screen. If this line runs from left to right across the screen it's in Verticla deflection. If it runs from top to bottom, it's in Horizontal deflection. I am assuming the problem is a Vertical deflaecion problem. The repairs necessary are most likley to replace the vertical capacitors or the verticla deflection chip.
Good Luck
Ed
NC Electronic Mills, Wyo USA

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1 Answer

White Horizontal Lines near the top of my Screen


this symptom is what we called vertical fold-over. vertical fold-over is characterised by a white horizontal bar on the bottom or top of the raster due to the concentration or compression of the trace lines. it an image is present, the bottom or top portion is fold over. this is caused by a vertical deflection current with poor linearity, which compresses the trace lines at the bottom or top of the screen. this symptom is is caused by a defective sawtooth wave genetator circuit, or improper biasing or defective feedback circuit of the vertical drive or vertical output transistor/ic. the negative feedback circuit in vertical deflection circuit compensates for the linearity of the trace portion of the sawtooth wave. a decrease in the capacitance of the sawtooth generator capacitor is usually the trouble. but if you do not understand anything what i have written here, better bring it to a qualified tv technician for your own safety also. good luck!

Mar 01, 2007 | JVC TM-2703SU 27" TV

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