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High voltage on horizontal output transistor on base side

Hitachi tv model c29cs1

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Helo sir, i have a L.G T.V. Model No kf-20p32..is blowing the horizontal output..i change the flyback tranformer ,bt is still blowing the horizontal output


Check all the capacitors connected to horizontal output transistor. Especially one connected with its collector to ground. a high voltage [1.5Kv]. capacitor. Replace them. Check for any short inside the winding of the yoke. It is difficult to detect the winding short inside the yoke. Connect an other yoke in place, after pulling out the CRT base card out of the TV. This you can make sure about the condition of the deflection yoke.

Oct 02, 2012 | Televison & Video

1 Answer

When i turn on horizontal output tripping. B+ and low voltage 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.

Apr 17, 2011 | Sony PVM-14N6U TV

1 Answer

My rca, when started, the sound come on but not the picture


Hello

Either your RCA tvs horizontal oscillator section or it LOT [Line Output Transistor} has some trouble. You just open your TV and check the voltage at the LOT pin. It should be around 112VDC or so. Check the voltage at its line drive transformer also. It is a small transformer diretly soldered on to the main board, and can be located very close to the above said LOT. Check voltage at its primay side , and if you have a digital multimeter capable of measuring frequency, check the frequency at this point. It should come around 15500Hz or so, without video signal. As far as sond is OK, all othere sections, ie video IF, Tuner Audio output and so, are working properly, only horizontal output is not. Check the horizontal output transistor, which drives the LOT, can be located very near to the LOT screwed onto a metal heatsink. If it collector to emitter or collector to base junction has some leak, it won't work properly, LOT will not work, and there will be no EHT [Extra High Tension], and will be no screen at all. Check these. If you wants anymore asistance from me, get me through Fixya. The fault with your TV is no horizontal sweep. OK.

Jan 08, 2011 | RCA F27442 27" TV

1 Answer

Hitachi 51f59a lost picture powers up and can hear sound amp come on when turned on and off but no picture


You may have a shorted horizontal output transistor. This transistor drives the high voltage transformer which in turn drives the picture tubes. High voltage can be dangerous so you may want to have a repair shop check it out for you. Also have them apply a bead of silicon around the anode caps on the picture tubes. This will prevent high voltage leaking out and causing the horizontal output to short again. Thanks

Oct 27, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

I have a hitachi ultravision 60sx11ka


cory, your losing the high voltage, could be bad solder joints in the horizontal circuit, ie; driver transformer, horizontal output transistor, or the transistor and associated capacitors have finally failed. If you keep trying and it will eventually start then it`s definitely bad solder and that`s a cheap fix from any local tech.

Nov 28, 2007 | Hitachi UltraVision CineForm 55VG825 55"...

2 Answers

My tv rca


there is loose contact on the high voltage section in your tv.what you are going to do is open it,and reheat  with soldering iron and a piece of soldering lead the video chroma section and the high voltage section,near the flyback

Oct 23, 2007 | RCA 32F531T 32" TV

1 Answer

Tv problem


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.

Aug 08, 2007 | RCA F27442 27" TV

1 Answer

RCA F27669 27"


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.

Aug 08, 2007 | RCA 27V570T 27" TV

2 Answers

Rca f27442


Check for shorted base-collector junction on horizontal output transistor designator Q14401. Also coil L14401 going to base of transistor needs to be desoldered, scrape ends, resoldered. If horizontal transistor is shorted, real possible flyback transformer bad.

Dec 16, 2006 | RCA F27442 27" TV

1 Answer

My tv is making a chirping sound with no picture


Sure can as its the most common problem RCA ever had with their tv sets, besides the tuner sheild problem in the past.. Your problem maybe a small coil off the horizontal driver transformer and the other side going to the base of the horizontal output transistor, as the coil needs to be taken out and the leads scraped as at the factory the robot left too much enamial on the coil wire and it causes a bad connection. Problem 2 could be a shorted horizontal output transistor that is shorted and or the main high voltage tranformer/flyback. If you know how to work on tvs then all you gotta do is give the model or chassis # to the parts distributor and they will give a kit with alot of papers to read and follow as well as a small blue cap along with a new transformer and be sure you measure the horizontal output transistor out of the circuit as in circuit it will measure shorted because the horizontal drive transformer to the base of it. Now if your not a tech then your gonna want to take in this set to a pro but let me warn ya its gonna cost between $175.00 to $250.00 bucks to fix.. Good luck

May 30, 2006 | RCA F32650 32" TV

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