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My tv has this lines that bend over the front top of the screen and when an object moves through the lines the image appers from the the top of where the line begins...and the tv goes black every once and a while

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This sounds like a vertical deflection fault. There are some components that are failing in the vertical deflection area that are starting to fail. It is very common in many of the sets that there are electrolytic capacitors in the vertical amp section that are gong out of specifications.

When you have at the top or the bottom of the screen where the vertical axis is compressed, and the picture in the compressed area looks like it is inverted and going over on itself, this is called "vertical fold-over".

An experienced TV service technician should be able to service this for you.


Jerry G.

Posted on Apr 19, 2008

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Posted on Jan 02, 2017

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1 Answer

Horigontal line appearing in screen


if the lcd dropped then forget it otherwise check x card for loose connection

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Tip

Explaining Camera Focus


Camera: Focus We've seen that a real image is formed by light moving through a convex lens. The nature of this real image varies depending on how the light travels through the lens. This light path depends on two major factors:
  • The angle of the light beam's entry into the lens
  • The structure of the lens
The angle of light entry changes when you move the object closer or farther away from the lens. You can see this in the diagram below. The light beams from the pencil point enter the lens at a sharper angle when the pencil is closer to the lens and a more obtuse angle when the pencil is farther away. But overall, the lens only bends the light beam to a certain total degree, no matter how it enters. Consequently, light beams that enter at a sharper angle will exit at a more obtuse angle, and vice versa. The total "bending angle" at any particular point on the lens remains constant. camera-diagram3.gif
As you can see, light beams from a closer point converge farther away from the lens than light beams from a point that's farther away. In other words, the real image of a closer object forms farther away from the lens than the real image from a more distant object. You can observe this phenomenon with a simple experiment. Light a candle in the dark, and hold a magnifying glass between it and the wall. You will see an upside down image of the candle on the wall. If the real image of the candle does not fall directly on the wall, it will appear somewhat blurry. The light beams from a particular point don't quite converge at this point. To focus the image, move the magnifying glass closer or farther away from the candle. camera-diagram2.gif
This is what you're doing when you turn the lens of a camera to focus it -- you're moving it closer or farther away from the film surface. As you move the lens, you can line up the focused real image of an object so it falls directly on the film surface. You now know that at any one point, a lens bends light beams to a certain total degree, no matter the light beam's angle of entry. This total "bending angle" is determined by the structure of the lens.




courtesy of HowStuffWorks.com

on Mar 21, 2008 | Canon PowerShot A520 Digital Camera

1 Answer

Three coloured lines appered on the screen - no picture


If there is no picture and 3 vertical lines in the center of the screen, stop. Turn off TV. You have no horizontal deflection happening. Lines will burn into crts and be permanently visible after repair.

No horizontal deflection is caused by Horizontal sweep circuit failure, maybe flyback transformer and associated components. More than a simple do-it-yourself repair.

easyab

Apr 22, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

2 Answers

Convergence on top of screen and 3D bended lines (yellow & pink lines).


Hi,
It is failure of convergence out ICs causing 3-D type picture on screen, you need to replace two big ICs in convergence section on main board.
Click Part Store to see an image of IC as well as price info.

If you need service manual of 43FWX20B, let me know to provide you a copy.
Thanks.

Apr 25, 2009 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

3 year old rca rear projection just started going blurry. green blue and red line across the top of screen. objects have shadow.


Focus and screen control box / remove front bottom panel there you will find it / it has 3 controls on top 3 on bottom top are focus for RGB tubes bottom controls adjust screen drives for RGB.

Jan 25, 2009 | RCA D52W23 52" HDTV CRT TV

1 Answer

Projection lights don't line up


Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
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  • No Audio/Video - makes a chirping sound.
Example Photo:
5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
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  • Halos around objects
  • Red/Orange looking
Example Photo:
ee1ca68.jpg

You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jan 04, 2009 | Hitachi 53SBX59B 53" Rear Projection...

1 Answer

The screen image is distorted with flashing green lines across the entire screen. If I unplug the TV and then plug it back it the normal screen returns temporarily


hi ive got a samsung SP24Q2HL rear projetion tv
it appers not to recive signal and only has distorted screen with green lines it sometimes works but very unreliable
please help

thanks luke

May 16, 2008 | Samsung Televison & Video

1 Answer

Moved the tv and now have a line on bar in top half with bend to it?


sounds like solder on convergence amps has hairline crack's

needs resoldering...

Oct 19, 2007 | Toshiba 51H84 51" Rear Projection...

1 Answer

Enquiry


Does the screen seem like it's stretched top to bottom? Or does it have a wave like appearance when the object moves on set? Either way some resistance has changed. You may look at board and see a chardd or burnt spot near a resistor. You shoud have value checked and replaced. Also look for any caps out of line or distorted.

Apr 13, 2007 | JVC AV-48WP30 48" Rear Projection...

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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