Question about Samsung TXG2746 27" TV

1 Answer

Vertical collapse L301 is burned in half. What could have destroyed it, and what is it? (the markings are gone). Thanks

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert who has answered 200 questions.

  • Expert
  • 236 Answers
Re: Vertical collapse

I think L301 is an inductor coil supplying B+ voltage to the vertical output IC, also a diode and resistor are associated with this circuit. Most likely the vertical IC has shorted causing L301 to open up. The diode could also be shorted. Stargazer

Posted on Sep 02, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer


This is commonly known as a vertical deflection problem. It cannot be fixed with an adjustment, but requires changing some electronic components. Namely the vertical output IC (integrated circuit) and in addition usually in this model a resistor which may appear to be burned.

Jun 15, 2011 | RCA F25645 25" TV

1 Answer

Toshiba Model 53HX71: Bottom half of screen and sound is fine; top half of screen has collapsed to a horizontal line in the middle of the screen. Repairman I spoke to briefly said it probably won't be...

Your TV has vertcal scanning problem. All picture tube based TVs have, both vertical and horizontal scan to spread the picture to entire screen. When vertical scan section meets with a fault, the picture will collapse horizontally and fi horizontal scan section has a troubl, picture will collapse vertically. Your TV s fault , we technically say, to be vertical foldover. This is due to the vertical output section, a circuit part, inside the circuit board of your TV.
To rectify this fault you must open your TV. Unplugh it from the power socket, and open it. Locate the vertical output section, which is easy to do. Look at the deflection yoke, the coil fitted on the neck of the picture tube, and you will see four wires from it going to the main circuit board. Out of which, two will be thick, normally red and blue in colour, connected to the opposite direction on the deflection yoke, and the other two will be thin. follow the two thin wires, said later, and you will reach to a plug in point on the printed circuit board.
Before doing anything, just look at the soldering of that section carefully for any loose soldering, or bad soldering. Usually, the components in the vertical output section will get heated during working, and ahve a cahnce to get loose contacted soldering joints. Just resolder all the suspected points by applying a little more solder, and see the effect. If thi doesn't help, check the IC used in that section for trouble. Some capacitors will be there in this section, will get dried as aging, replace them first, as they are ver few in numbers, When replacing capacitors, note their polarity, as electrolytic capacitors have both positive and negative terminals like torch cells. Before replacing the vertical IC, replace all the capacitors, especially, two or three large capacitors on that section. Just do these and if you want any more assistance feel free to contact me through Fixya. OK

Dec 08, 2010 | Toshiba 27AF42 27" TV

2 Answers

My TV picture has collapsed to a single horizontal line

If it is an standar analog tv, I'm sorry to tell you but, is time to get a new one.

Dec 05, 2009 | Panasonic Standard (CRT) Televisions

1 Answer

I have a 35in Toshiba tv and it come on but have a stright line in the middle of tv.


If the line is VERTICAL and at the centre of the screen it is called LINE COLLAPSE, but when the line is HORIZONTAL this is called FIELD COLLAPSE.

It may be dry joints on the field/frame output IC or it may have gone open circuit. I know that the field/frame output IC's can be obtained, but if you are no good with a soldering iron then you'll have to put it in for service.


Oct 06, 2009 | Toshiba CX35F60 35" TV

1 Answer

Picture appears only as a thin, horizontal line...

chk vertical amp /vertical drive i/p from oscillator/power to it/power to vertical amp/chk dry joints-hot area/look at vertcal amp capacitors-swelling etc

Jul 04, 2009 | Akai Standard (CRT) Televisions

1 Answer

Panasonic 25'' 4:3 CRT Vertical collapse.

Change the vertical IC they are damaged

Jul 02, 2009 | Standard (CRT) Televisions

1 Answer

Line across screen if i hite it it will work for a some time

If the line of which you speak is a horizontal line that looks like the picture collapsed, the problem is a vertical circuit problem. If hitting the set "fixes" it, then it is likely to be a bad solder connection. If you can solder, resolder the pins on the vertical IC. This is a small flat IC with about 11pins attached to a heat sink that may me marked LA7837 or something similar.

Let me know if that fails to resolve the problem.


Sep 26, 2008 | Toshiba 36A50 36" TV

1 Answer

Sanyo 25" Standard Tube Vertical Deflection Problem

you can proceed as follow to fix it.

  1. reduce brightness to minimum to avoid screen burn.
  2. check voltage on vertical uotput
  3. check yoke connector for loose.
  4. check v/yoke winding.
  5. check v/drive from signal processor to vertical output

now your problem how to find out whether drive is there or not it is very simple even you donot have scope.

you simply touch with screw driver or meter prob  at the poibt where vertical signal is input to vertical stage

if h/line is spreadindg or tries to spread then your output is ok &problem is in drive ckt.

for schematic try given site give model no &download it

hope this will help



Oct 12, 2007 | Sanyo AVM-2557 TV

1 Answer

Mitsubishis TV Problem

have a Mitsubishi TV 1993. Model CS-35301. The problem is that there is a white line that is running through a blank screen. The sound is fine just no picture. Have you heard of "Vertical Collapse?" I would love to save the TV. Hi nothing to worry just minimise brightness to avoid screen burn. "Vertical Collapse?" means one bright hor.line in the middle of screen. this problem can be solved 1 check vertical yoke connector or wire loose 2 check supply to vertical section which normally comes from EHT transformer check components in vertical section or print loose regards thanks

Sep 10, 2007 | Standard (CRT) Televisions

Not finding what you are looking for?
Standard (CRT) Televisions Logo

Related Topics:

78 people viewed this question

Ask a Question

Usually answered in minutes!

Top Samsung Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66499 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Jaime Hernandez

Level 3 Expert

2267 Answers

Are you a Samsung Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides