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Ive got a unbranded tv set. i replaced the horizontal out put transistor twice and same result H-out get busted. try another H-out transistor disconnect the collector of the transistor from the board

Tv totally dead set. busted H-oout

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  • 124 Answers

Replace fly back capasitor

Posted on Apr 29, 2014

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Posted on Jan 02, 2017

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SOURCE: Question about the voltages.

I have read your two previous questions on this TV. I am not sure what your original problem was. Is the High Output Transistor the same as the Line Output Transistor? 161 volts sounds correct for USA. Is the HOT Emitter/Base at ground potential, if so then you do not have a dud line output transistor, otherwise it would not sustain 57 volts.

Posted on Oct 22, 2006

gopakumarg43
  • 74459 Answers

SOURCE: I have a dead tv make konka model kp2905qyt

Check the frequency of oscillation at the base of horizontal output transistor. It should be around 15.6KHz. If there is no frequency, the horizontal osciallator jungle IC should be suspected.

Posted on Nov 29, 2012

gopakumarg43
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SOURCE: Iam having problem with a konka tv model kp2905qyt. there is no EHT but 130 volt is present on collector of horizontal output transistor, pleasse help

This problem has been answered a few while ago. Check the horizotal oscillator frequency.

Posted on Nov 29, 2012

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1 Answer

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


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/

Apr 26, 2015 | Samsung Televison & Video

1 Answer

Horizontal transistor all damage in few hours after replace


Dear Sir:

Please review your schematic T.V, any component around from Horizontal transistor can destroy it.because is in Short Circuit, use your DVOM for isolate the components, measure the resistance, continuity ,and test for transistor, capacitor, resistor, diode, etc. 2) You must shure if the replace is the same caractheristic from the original.
Otherwise, the componente can not be result.

You can download the schematic from www. retrevo.com

sincerely. God bless you

May 05, 2012 | Sanyo Television CRT TV 27in * AVM300U...

1 Answer

TruFlat Tv turns on then off


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.

Oct 24, 2011 | RCA TruFlat 27F520T 27" TV

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

The tv won't come on...when you turn it on the green light on top comes on...blinks twice and then goes off


Hello

There is some short circuit in the horizontal output section inside your RCA tv. The blinking of ztandbylight twice denotes it. it may be due to a short in the horizontal output transistor, or defective LOT [Line Output Transformer]. Remove the horizontal aoutput transistor, by resoldering it out. It can be located very near to the above said LOT, screwed on to a metal heatsink. It is a three terminal device usually black in colour. After resoldering it out, switch on your TV, and see whether the standby LED blinks or not. If not, replace it with a new one, and switch the TV for a short time, say 3 seconds or so, and switch it off, unplug it from mains supply, and feel the heat of the transistor replaced. If it overheats, LOT said above is defective, and should be replaced with same type and number. OK.

Jan 05, 2011 | RCA F32450 32" TV

2 Answers

Tv will not turn on


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 25, 2008 | Toshiba 32A33 32" TV

1 Answer

Tv is not wrking


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 17, 2008 | Sansui DTV2760 27" TV

1 Answer

No power.


Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.

Aug 23, 2007 | Sony KV-32V35 TV

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