I replace horizontal output transistor with new one but it happens the same short

Hello
You are talking about the horizontal output transistor damage I assumes and post this solution. If LOT has internal winding short, the horizontal output transistor will get shorted. It will be best to replace the horizontal output transistor, alongwith the LOT

Hello
Check its horizontal output transistor for short circuit. It is a common fault to all type of CRT based TVs, and show this type of fault. If it is found shorted [collector to emitter], the LOT should also be checkd for winding short [internal]. Normally; LOT cannot be checked with normal measuring instruments. If LOT has internal winding short, the horizontal output transistor will get overheated and finally shorted.
Replace the horizontal output transistor first, and check whether it heats up ubnormally within seconds after switch ON the Tv. If it heats up so, make sure that the LOT is defective, and it should also be replaced. OK.

Hello
Check the supply rail to LOT. If LOT [Line Output Transformer] is fauty, it will take tremendous current from the SMPS power supply output, and the overload sensor circuit will be energiised and the supply to the whole system will sut OFF. That is happening eith your TV now. Just desolder out the horizontal output transistor, the transistor that drives the LOT, and switch the set ON, and see whether it stays on or not. If stays on, check the collector to emitor resistoance of the horizontal output transistor. If there is any short with it, replace it and switch ON the set for a short time, say 5 seconds or so, and check whther the replaced transistor gets overheated. If it overheats, make sure that the LOT said above has damaged, and must be replaced with same type and number. If the fault is with the horizontal out put transistor, the set will work normally after replacing it.
The components can be bought from local electronic spare part shops at your town. OK.

Try to replace new harizontal output transistor.Before replacing the transistor,check the regulator and the flyback if shorted or not.If the flyback is shorted the harizontal output transistor will be damage again if you trying to turn on again.Thanks..

Hello
Six blinks denotes the absense of horizontal sweep. Check the horizontal output transistor, whcih can be located very near to the LOT [Line Output Transformer]; for short. If it is shorted, LOT must be suspected. Replace the line output transistor with a new one, and switch ON the tv for a short period of time, say 6 seconds or so, and check the heat of the replaced transistor. If it overheats within this time, be sure that LOT is damaged; shorted inside; and should be replaced with same type and number. If a digital multimeter which can measure frequency is available, take the frequency at the collector of the horizontal driver transistor. It should come around 15525Hz. If not replace the jungle IC. OK.

Hello
Check the LOT and Horizontal Output Transistor. If horizontal output transistor get shorted [collector to emitter or collector to base], this kind of fault will occur. Here there is nocollector to emitter short as B+ is ok. Check for collector to base leak. It is best to repalce the horizontal transistor with a new one, and switch on the Tv for a short while, say 10 seconds or so, and feel the heat of the replaced transistor. If it gets overheated, of LOT makes a whisiling of hissing sound, LOT is faulty, and shoul be replaced sith same type and number. OK.

Your main power supply may have failed or you've lost the horizontal drive pulse to the the horizontal output transistor. Also the flyback may be bad and the horizontal output transistor may be shorted. If this is the case the main power supply will not start up. These are a few things that may have happened. Stargazer

The F27442 uses the CTC203 series chassis and that symptom is very common. If the horizontal output is shorted you MUST resolder the coil in series with the base of that transistor and the pins of the small horizontal drive transformer. When they have been properly resoldered you can put in a new original horizontal output transistor. If the output transistor shorts out again then your flyback (high voltage) transformer is shorted and needs to be replaced.

The F27669 uses the CTC203 series chassis. The most common cause of that symptom is a shorted horizontal output transistor, caused by a cracked solder joint on a small coil connected to that transistor's base. When this happens, the main B+ supply is shorted to ground so the power supply squeels. Every once in a while I also see the horizontal output transistor shorted due to a shorted flyback (high voltage) transformer. A good tech will replace the horizontal output transistor, resolder the coil and drive transformer, test the flyback (replacing it if necessary) and your set will be back to perfect.

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.