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What's the cause I already install three horizontal output of Samsung TV model number CT-15N30MJ always busted horizontal transistor?

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Check the capacitor connected to the collector of the horizontal output transistor to ground for loose solder or open. Replace that freewheeling capacitor [ usually comes between 3900Pf to 9600Pf 2000V]. Replace it with an other one of same capacitance value; before proceed. Even if it blows out the horizontal output transistor; entire circuit should be checked. Check the deflection coil too for shorted winding.
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 Apr 26, 2015

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Posted on Jan 02, 2017

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SOURCE: always damage the horizontal output transistor..if

Check the Line Output transformer and associated circuitry.for a short.

Posted on Jan 26, 2010

gopakumarg43
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SOURCE: what causes the horizontal transistor to short?

Hello
You just replace the capacitor fitted very near to the horizontal output transistor,[freewheeling capacitor], there may be one or two of them, whcih comes to a value of 3900pf to 6700pf 2000V or so. It is connected to the negative rail and the collector of the horizontal output transitor. If it gets opened, or its value gets reduced, this fault will occur. If so the transistor you replace will get shorted as you swich on the power to TV.
The second one is deflection yoke short. If so the transistor said above will overheat within seconds. Even a single winding inside the horizontal deflection yoke shors, it puts a tremendous load to flyback transformer, which in turn effects the transistor.
After replacing the above said capacitor, you do one thing to make sure about whether there is a short inside the yoke or not. It cannot be measured by normal methods. Fore that, unplug the base card from picture tube and place it somewhere near without getting any of its contacts to other parts inside your TV. This time only the EHT chord will be connected to picture tube. Unplug the horizontal yoke connection from main board. Switch on the tv, and wait for some time, say at about 10 seconds, and check whether the transistor gets overheated or not If it does overheats now also, the winding or EHT retifier diodes inside your flyback transformer has some trouble, and it should be replaced with same type and number. If it does not overheats now, the deflection yoke's winding have some short in it. Ok.
NB: Never connect the TV with base card is in postion while deflection yoke connection is isolated. keep it unpluged.

Posted on Oct 27, 2010

gopakumarg43
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SOURCE: what is the cause

This is a common fault that everybody feels, when replacing the horizontal output transistor for Samsung CRT TVs. Samsung has provided no heat sink to this transistor, and generally, it wont't heat up abnormally. You should use the exact number of this transistor when replacing it. We can't get it from open market. Only authorized service center for Samsung can supply us its exact replacement. No more experiments should be done further, with any other number horizontal transistor. All of it work for a while, and will get shorted.
Gopakumar Gopalan Google

Posted on May 07, 2014

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What's the flyback number of Samsung CRT TV model number CT-15N30MJ?


FCM2014FL / FCM14A025 If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ .

Apr 26, 2015 | Samsung Televison & Video

1 Answer

What is the cause


This is a common fault that everybody feels, when replacing the horizontal output transistor for Samsung CRT TVs. Samsung has provided no heat sink to this transistor, and generally, it wont't heat up abnormally. You should use the exact number of this transistor when replacing it. We can't get it from open market. Only authorized service center for Samsung can supply us its exact replacement. No more experiments should be done further, with any other number horizontal transistor. All of it work for a while, and will get shorted.
Gopakumar Gopalan Google

May 07, 2014 | Samsung Televison & Video

1 Answer

HOT transistor TT 2222burn after second replace. TV Samsung Model CS-21Z45MJ


Hello
Before replacing an other one, replace the freewheeling capacitor, the capcitor fitted between the collector of the 2222 and earth; usually of a value of 3500pf 2000VDC, some times this value may differ from set to set. If this capacitor has opened of developed in value, the result will be the failure of the horizontal output transistor, at switch ON itself. The second reason is the short in horizontal yoke windings. Even one winding get shorted, it will cause to a heavy load flyback transormer which in turn to 2222 failure. The last reason for this fault is defective Line Output Transformer itsef. Check these three.
Before proceeding, desolder out the horizontal output transistor 2222 fro circuit, and measure the frequency at the collector point of horizontal driver transistor. It should be around 15625HZ [may differ a little], with no signal. If this frequency is found higher than normal, The main IC jungle should be suspected.
Anyway, go forward after checking this frequency. OK.

Jun 10, 2011 | Televison & Video

1 Answer

What causes the horizontal transistor to short? flybak ok, supply line ok. my tv is a samsung with a model #: ct-21k30mh.


Hello
You just replace the capacitor fitted very near to the horizontal output transistor,[freewheeling capacitor], there may be one or two of them, whcih comes to a value of 3900pf to 6700pf 2000V or so. It is connected to the negative rail and the collector of the horizontal output transitor. If it gets opened, or its value gets reduced, this fault will occur. If so the transistor you replace will get shorted as you swich on the power to TV.
The second one is deflection yoke short. If so the transistor said above will overheat within seconds. Even a single winding inside the horizontal deflection yoke shors, it puts a tremendous load to flyback transformer, which in turn effects the transistor.
After replacing the above said capacitor, you do one thing to make sure about whether there is a short inside the yoke or not. It cannot be measured by normal methods. Fore that, unplug the base card from picture tube and place it somewhere near without getting any of its contacts to other parts inside your TV. This time only the EHT chord will be connected to picture tube. Unplug the horizontal yoke connection from main board. Switch on the tv, and wait for some time, say at about 10 seconds, and check whether the transistor gets overheated or not If it does overheats now also, the winding or EHT retifier diodes inside your flyback transformer has some trouble, and it should be replaced with same type and number. If it does not overheats now, the deflection yoke's winding have some short in it. Ok.
NB: Never connect the TV with base card is in postion while deflection yoke connection is isolated. keep it unpluged.

Oct 27, 2010 | Samsung Ultra SlimFit 20" Digital TV

1 Answer

Aiwa tv-14ST3 horizontal output always shorted


Hello
If horizontal output gets shorted always, something may be wrong with Line Output Transformer [LOT], or deflection yoke. If LOT windings inside is short, hrozontal output transistor will get overheated, and will be get shorted soon. If there is winding short in the Deflection yoke, even a sinlgle winding gets shorted, it puts a great load on LOT, which in turn effect horizontal output transistor. The third main reason for horizontal output transistor failure is due to an open or dry solder at the capacitor connected to its collector to negative It will be usually 2500pf to 3500pf, according to the TVs screen size. You just check these three and be sure about the fault.
Ok.

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1 Answer

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5 Answers

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The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.

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