Question about Sony KV-35S42 35" TV

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Tv was dead no vvidei no sound after checking found that power supply capacitor and horizontal deflection output transistor was defective i lost that tr no part no please tell me what should i do?

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Hello
There are few models of Sony telivisions which uses transistors in vertical output section. It will be a matched pair of PNP and NPN transistors. According to Sony schematic which I have with me used 2SB6494(PNP) AND 2SD669A(NPN) as vertical outputs and 2SC2383 as vertical drive, 2SC1364 as vertical oscillator. Just try to get the orginal numbers or find its equivalents from data book. Ok.

Posted on Oct 18, 2010

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Check for any short circuit at the horizontal output section circuit. Check all the non-electrolytic capacitors used there. Replace all suspected ones with same capacitance value. A winding short in the windings of deflection yoke, will too make the horizontal output transistor to get overheated. If so, there is no other way than replace the deflection yoke. If you wish to get more details, check the site linked here. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.

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Your fly back, horizontal is in good condition but the possible fault is in the deflection coils or the deflection correction , pin correction section or the hirizontal width coils.
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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.
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You've lost the horizontal deflection circuit. Most likely the horizontal output transistor and high voltage
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Stargazer

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2 Answers

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I disagree with given info, this tv has no horizontal output transistor because it is dlp tv.
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1 Answer

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try to check first if theres an output voltage in the wall outlet. if there is, you have a completely inoperative (dead) set. this symptom is usually caused by a breakdown in the power supply circuit. in most modern receivers (transistorized and/or IC), it may also be caused by a breakdown in the horizontal deflection circuits (horizontal oscillator, pre-drive or drive circuits). this is because the supply voltages for the tuner, video intermidiate frequency (VIF), video amplifier, sound intermidiate frequency (SIF) and vertical output circuit are usually supplied by the horizontal output circuit. but again, if you are not inclined in this kind of job, better bring it to a qualified tv technician. good luck!

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1 Answer

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