29"Colour TV ,Sound Normal ,No Picture a vertical line Appears

The image on a CRT TV is produced by a beam of electrons which is controlled by a magnetic field to move the beam top to bottom and left to right. A single line suggests that the vertical deflection is working but not the horizontal deflection (left to right). There are a number of components associated with this and requires a competent TV repair engineer to fix. Better to to buy a new TV!

If it shows picture at first, and after some time displays a vertical line at the center of the screen, check the connector that goes to deflection yoke for loose connection at its bard end socket, and check all the solder terminals of capacitors at horizontal output section. If you wish to get some details, http://electronicshelponline.blogspot.com/ Pull up older posts.

Hello

The vertical scan of your TV has failed. All picture tube type TVs have both horizontal and vertical scan sections to scan the picture on the secreen. When horizontal scan fails, you will see a vertical line at the middle of the screen, and if vertical scan fails, there will be a horizontal line through the middle of the screen. In your TV, the second stated has happened.
This may be due to an IC trouble or a voltage loss inside the printed circuit board of your TV. To rectify this fault you have to open your TV, and locate the vertical output section inside it. It is very easy to locate that section. There will be four wires goes from the deflection yoke; the coil fitted at the neck of the picture tube; out ot which, two will be thick and the other two will be thin. The thick wires are usually colour coded as red and blue. Colour coding may differ from set to set. Anyway you have to follow the tow thin wires, as they are carrying vertical scan signal to the yoke.
Following it, you will reach to a plug in point on the printed circuit board. Upside down the printed circuit board, and follow the track through which that wire connection goes, and finally you will reach to the vertical output section.
There may be transistors or IC used on that section. First check the voltage at the vertical output section. Voltage lose also may occur in this section. If it uses IC, check for any loose or bad solderings at the terminals of the IC. I advice you to resoder the suspected points by applying a little more solder, without shorting the terminals. In most cases this will solve the problem. If there is voltage, and there is no loose solderings and still the fault perists, replace the IC or transistors, whatever it may be, with same type and number.
If you want anymore asistance, fee free to contact me through Fixya. OK.

The most likely cause is shorted convergence chips and possibly a few pico fuses.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix here http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

this we call vertical problem need to resolder vertical ic or to check on vertical side is there 24vdc supply is coming to ic

If your screen has a picture in the left corner with a small square with lines on it but still has sound...try this....

unplug your TV itself from the power source, then hold down the power button on the tv itself for 1 minute, then release.... Plug the tv back in and see if the issue is resolved. I just called LG customer support and a woman walked me through this process and it fixed the issue !!!! Hope this helps..

Hi,
    According to the symptoms, There is a problem in vertical out section.Just check it there must be a capacitor that has been burst or leak.And second one reason could be the malfunctioning of vertical IC.Which is also in the vertical section.

Thanks for using fixya.

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Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback lines, frame ok. I detected two badly soldered double diode rectifiers in the secondary part of the power supply ! I checked all other joints, and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok

My LG tv has suddenly got a problem with the picture. Whilst watching the tv with no problems at all, the picture was suddenly reduced to a thin vertical line down the centre of the screen and an awful smell seemed to come from the tv There is a short ckt in your tv in horl. section. 1 isolate power from horizontal section. 2 check for normal output from power supply. 3 check parts in horl output section a hor.output transistor b diode & cap in h/output trnsformerckt. c check for print. d if all are ok check for eht transformer. e if every thing becomes then reconnect hor output section supply. f put on the set.