Question about Sony FD Trinitron WEGA KV-32FS120 32" TV

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Screen What is causing my screen to have a small specs or lines of white to appear?

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Re: Screen

Are the line bright white retrace lines going down screen? If so then screen voltage maybe too high

Posted on Aug 29, 2007

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Lg tv 47lv4400 white screen with vertical lines

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Line faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Line faults to all LCD screen are similar, irrespective of its brand and screen size.

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Horizontal white lines 27A43.

You have some bad capacitors. They are located very near and next to your vertical IC. I would guess you would have to replace maybe four of these! Thanks for asking!

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Thin white horizontal lines have appeared on the upper quater of the screen. Under these lines a greena red line has appeared. Bottom three quarters of screen is good.

u have to change a capacitor(470mfd or 100 mfd) in vertical section of u'r tv circuit board..if u r a tech person try this...

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1 Answer

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Sounds like retrace lines. Leaky caps or worse can cause this.. Are you getting any vertical foldover at the top of the screen?

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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!

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1 Answer

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1.Are these lines only in the upper 1/3 rd portion of the screen?And is there a clear demarcation between this area and the lower portionb, where the image is perfect? 2.Or is thin Horizontal lines evenly spaced around an centimetre apart? If it is the first case, then there si a problem with your TVs SMPS. It is not generating the required regulated 110V required for the TVs functioning. If it is case 2, then there is a simple adjustment at the back - 'SCREEN'. This adjusts the Screen Grid Voltage, and by slightly lowering it, this problem will go away.

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1 Answer

Some part of TV has been fused causing no picture on screen , only bright green horizontal lines , not even video channel could be set ,cannot see menu on screen please help by specifying possible...

if the screen is real bright green with thin small white lines in it its probably a shorted picture tube. Or a shorted Green driver Transistor. Good Luck

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