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Line output transformer fault

Line output transformer and ic fault condition i want to solve this problem

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What is the brand name to your TV? Provide more details, please. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Nov 16, 2014

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Posted on Jan 02, 2017

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SOURCE: vertical line in center have replaced vertical output ic

If the line is vertical then the problem is no horizontal deflection. The vertical chip is probably fine.

Check connections around yoke (thats the connector with at least four wires that goes up to the coils around the neck of the tube)

Maybe that TV has two horizontal output transistors. One for deflection and one for high voltage? Check both of them. Look for bad solder joints!!!

Posted on May 22, 2009

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Sony 29 crt flat tv dabble picture and sifted horizontally


Main system chorma IC fault. Horizontal rolling is the fault. Replace that IC. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences of the author of that site.

Sep 22, 2016 | Sony Televison & Video

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How to solve horizontal lines on a CRT TV monitor and what could be the possible courses for it


Monitor horizontal lines problems usually caused by a defective vertical output/driver ic. A missing supply voltage to the vertical output ic may caused similar faults which is one horizontal line across the display. Dry joints and missing vertical output pulse from vertical oscillator ic also could contribute the same symptom. If you discovered that the protection resistor (usually from 1 to 4.7 ohm) open circuit or burnt, then replacing it won't solve the problem. The resistor burnt or open circuit was due to a short in the vertical output ic. Thus you have to replace the vertical output ic and the burnt resistor together before you switch on the monitor.

Jun 12, 2015 | Televison & Video

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There is a malfunction in the THT


Hi Hashim.
EHT (Extra High Tension) usually reefers to the 24kv to 30kv, focus and first anode (A1) voltages required to operate the crt (picture tube). These voltages are supplied by the line output stage, primarily the line output transformer (often refered to as the flyback transformer). This transformer steps the voltage up to 8kv and an embedded rectifier trippler circuit tripples this to 24kv dc to supply the final anode voltage to the tube (Hence the big rubber cap and thick cable.
The line output transformer is driven by a smaller transformer (line driver transformer) via the line output transistor.
The driver stage is fed by the hoizontal oscillator circuit.
So we can see that a failure in any part of this circuitry will most often result in no picture. The line output transformer is the heart of the system, it not only supplies the EHT voltage it also has to
supply an LT voltage for the vertical output stage but also the sound output stage.
A Fault in the A1 circuitry would result in a very dark picture but sound ok. Or the picture badly out of focus.
The line output transistor going short circuit results in no picture and no sound with the set shutting down to the standby mode or
hic upping (making a ticking noise. This problem would be amongst the most common and is easily confirmed with an Ohm meter. The line output transformer itself can develope an internal short with the same results (less common). Failure of the line oscillator and driver stages are most easily confirmed with an
oscilloscope. A fault in the power supply will also give these symptoms. To confirm line output stage is functional look to see if the tube heaters are glowing, this supply also comes from the line output transformer. Can you feel the static if you run the back of your hand across the front of the screen (often feels like running your hand through cobwebs. this would indicate that the EHT is present and the fault is elsewhere. Understanding how something
works enables you to find out why it doesn't. If you have occasion to replace a short circuit transistor, be sure to reslder all pin connections to the line driver transformer. I've found dry joints here
to be a cause for random inttermittent failure of this transistor,
Best regards from Vintie.

Jan 07, 2014 | Sony WEGA® KV-XR25M80 TV

1 Answer

Magnavox tp3273c102


You have not specified the condition of audio with your TV. If audio [sound] is present, and no picture is the fault, the horizontal output section circuit should be trouble shooed. In most cased, this type of fault can occur if the LOT {line Output Transformer} has damaged. It will be best to contact any experienced service technician to confirm the fault. It will look like this.

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Jul 17, 2012 | Philips Magnavox 27MS343S 27" TV

2 Answers

My picture tube displays all black except one thin horizontal line in the middle. There are no horizontal or vertical adjusts that I can fine. Is the picture tube burned out with just this one line?


Hello
A thin horizontal line across the screen denote that the vertical swep or output has damaged, or there are some loose solder points to vertical output section. Loose solder problems are very common to the vertical output sections of most of the picture tube based TVs. Just open your Tv, and pull out the main baord out of it, which has the vertical output section circuit. You must have some knoldge in electronics to proceed. Locate the vertical output section. usually, this section will be composed of an IC, which will be screwed on to a metal heatslink, to radiate heat out of it when it works. Check whether there is any loose solder terminals at this section, especially look for it at the solder terminals of IC and other components around it.
It is very difficult to detect the loose solder points, as some of them may be so microscopic to detect. Just do, what we do at service table, with this type of fault comes to us. Just resolder most of the suspected solder terminals by applying a little more solder without making any sokder bridge short between adjecent solder terminals.
If this does not help you, check the input voltage to the vertical IC. If found OK, replace the vertical output IC. If there is no voltage to this IC, check the track that brings voltage to that IC. Usually, this voltage will come from one amoung the terminals of LOT [Line Output Transformer]. Check the track, rectifier diode, limiting resistor etc. This is really a skilled work, and you should have all tools for an electronic work, and a skill to detect the faulty component. OK

Sep 16, 2011 | Durabrand DWT1905 TV

1 Answer

My china tv horezantal transister heatup


Hello
If horizontal output transistor heats up rapidly within seconds after the TV is switched on, surely there is some fault in the horizontal output section. It may be either with deflection yoke or horizontal output transformer. Deflection yoke fault is very rare, about 1% or so. but the horizontal output transformer fault is common. The winding in the horizontal output trnsformer, otherwise called as line output trnasformer [LOT] also. can be shorted inside it, and is irrepairable. It should be replaced with same type and number. Number and type is mor important, and should be insist on. Replace the horizontal output transformer. OK.

Feb 12, 2011 | Sanyo Televison & Video

1 Answer

I have a sony trinitron puchased 2001 after 911 standby light flashes constantly picture flashes off and on


Hello
Complete loss of horizontal oscillation and output is the trouble. To get it repaired you have to open your TV, Just look the horizontal driver transformer, a small transformer fitted on the main board very near to the line output transformer [LOT] for winding opened. If its primary winding gets opend, even though the horizontal oscillator section works, the pulses will not reach the horizontal output trnasistor, which drive the above said LOT, and the fault you describes will occur. Check the main secondary regulated supply voltage [140VDC] also. If this voltage is missing, check the reason and follo the supply rail print from the SMPS power supply reguator section.
Check the low voltage regulator IC, usually 7808 or 7812, which can be located on the main board, which supplies 8VDC or 12VDC to the ICs on the main board. Anyway, there is no horizontal output fuction in your tV. and try to find it. If you wants furthermore assistance, feel free to get me through Fixya. OK.

Jan 01, 2011 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

When I turn on tv,it shows a white screen and don't anything do


Hello
You haven't specified anything about your TVs sound condition. If the sound is there and only the picture is out, leaving a white screen behind, it is due to the R-G-B output section of your TV. The section mentioned above comes on the picture tube base card, a circuit board connected on the neck of the picture tube, directly pluged onto it, with the help of a socket called picture tube base socket. You just measure the voltage to it first. The main voltage comes to it from the secondary voltage winding from the line output transformer, [LOT], generally, or from the SMPS power supply itself. It will come upto 260VDC, and must be there. If this voltage is missing, the fault you mentioned will occur. If this voltage is there, the fault may be due to a decective video output section. It may be built in with transistors, or an integrated circuit [IC].
Usually, Samsung uses Philips IC, number [TDA 6007B], or its equivalent in this stage. Check for any loose, or bad soldering on the terminals of this IC. I advice you to resolder all the pins of this Ic, by applying a little more soder, without making any short circuit bridges in between them. zin most cases, this will solve the problem. If it doesn't help, replace the IC with an identical in type and number.
If you wants anymore asistance, feel free to get me through Fixya. OK.

Dec 20, 2010 | Samsung CSN2077 20 in. TV/DVD Combo

1 Answer

Stanby power and always blinker light what is the main troble of that?


Hello

There is no horizontal oscillation drive pulse reaching the horizontal output transistor. There are so many reasons for this fault. Line drive transformer's primary winidng open, its load resistor has opened, line driver transitor fault, absence of horizontal oscillating signal from the Ic , Line Output Tranformer otherwise known as [LOT] fault and so on.

If you have a digital multimeter, capable of measuring frequency, the thins will be easy. Take the frequncey at the base of horizontal output trnsistor, which in turn drives the LOT. It should be around 15625Hz or so, with no video signal. With a transmission signal it will synchronise to 15625hz; in PAL system. Anyway desolder the horizontal output transistor from board, and check it for collector to emitter leak, first. If it has leak, replace it with same type and number. If it is Ok, come towards the line drive trnsformer, a small transformer directly soldered onto circuit board, very near to the above said LOT. which in turn drives the horizontal output transitor.
One end of its primary winding will go to the collector of the horizontal drive transistor, which will be a small one, and the other end to the supply point through a resistor. Check the voltage of the resistor point of line driver transformer, and the check the voltage of the other end, which is connected to the collector of the line drive transistor. There must be wome voltage difference, between these two points, say at about 3 volts os so. If so, pto this point is ok, and line drive transistor is working, and it gets the above said frequency. If not suspect the Ic.
Upto this point is ok, and still there is no oscillation at the line outoput, means fault is in the above said LOT. Replace it with same type and number.
There is an easy way to check whether LOT is working or not. If LOT is working, there will be Extra High Tension voltage coming to the final anode of the picture tube. You just place your forearm parellel to the face of the picture tube, just a centmeter away from it, and switch on the tv with its mains switch. If LOT is working and EHT is there, the hair on your forearm should be attracted towards the picture tube and can make sure that LOT is working. If so fault is surely to mainjungle Ic, and it should be replaced. OK.

Gopakumar. India.

Nov 21, 2010 | Philips 14PT1686 14" TV

1 Answer

Turn on TV, no picture but sound is ok, thin white line running across screen


You have a frame collapse problem. Line, EHT, power supply, video and sound stages are all functioning. Check frame output ic for dry joints, resolder all pins. HT supply for output ic's derived from line stage check for open circuit safety resistors around line output transformer, if you find any then frame output ic will also be suspect. WARNING Very high voltages exist around the line stage. Make cold tests with Ohm meter with set unpluged from mains supply.

Feb 27, 2010 | Toshiba CN36X81 TV

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