Question about Sony FD Trinitron WEGA KV-21CL10 21" TV

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I have renew a fuse,Transistor D 1878 7G1 on a TV make Sony Model j21mf2,but the Tv not starting.Fuse..OK,Transistor..OK,Power switch..OK.The TV not started..Can you tell me why??

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  • Shahid Electronics
    Shahid Electronics May 11, 2010

    Check horizontal oscillator and driver section of TV. Use oscilloscope to observe horizontal pulse waveform.

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Probably PTC in power supply faulty

Posted on Jun 13, 2009

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Have you check power ic if okey your volteage is below 90v ac

Posted on Apr 23, 2009

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The fuse of my Sony KV-27s42 somehow got burnt.Can anybody tell me what is the fuse model and where to buy it?


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1 Answer

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Hello
You haven't specified anything about your Sony Tv. No model number or anything to compare. Although I hereby giving you a general trouble shooting method, first adopted by technicians like me. You have stated that the fude has blown out. Fuse will not burn out without any reason. it is a protective device used in every telivisions,as if any internal components inside it gets shorted, especially in power supply section, the fuse will get burned and protect the other components from further distruction. Therefore you have to trace the reason for the failure of fuse first.
You must beging it from power supply regulator section itself. Chech the resistance accross the main filter capacitor first. Set the multimeter in Ohms range, and the resistance must be above 250Ohms in one direction, and upto infinite in the other direction. If both readings comes below 20Ohms or so, suspect the power regulator Ic; usually sony sets udes STR type regulated power supply, and this STR will get shorted. As you haven't specified your sets model, I can't make sure whether it is circuted with STR or a switching transistor. As both cases, this regulator has a chance to get shorted. Desolder it out and check for short. if it finds shorted, check the rlated components also, such as zener diodes and resistors, for open and short,as they also will get damaged due to this main switching transistor, or STR; whatever may be.
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1 Answer

We have a Sony Bravia lcd tv model KLV-S40A10 - no power


Hi,the problem is from the fuse in the tv,it's blown and it's a means of in-built security against power fluctuations from damaging the unit,so the solution is to replace the fuse of the TV to restore your unit back to a normal working condition.

Be cool.

Jun 13, 2010 | Televison & Video

1 Answer

Tv wont switch on


This could be a problem with the power supply. Yes there is a fuse on the power supply & if you have a multi-meter & are competent with electrical safety, you could test it. However, if it has blown then almost certainly something else will have caused it. You might have a short circuit bridge rectifier or faulty chopper transistor. If the fuse is ok, then you will need to check voltages from the power supply to find out what feeds you have. There may be a start resistor open circuit for example. If most of the start up voltages are ok, then you need to look at the line output stage & check if this circuit is getting any voltage supply.

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1 Answer

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fuse, power transistor, zener diodes,also rectifier diodes
if you can manage do it at home
or take it to a w/shop

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1 Answer

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your tv has a  short  circuit, the power supply see that and put away the polarizatio n , you have to check  if transistor of power on flyback transformer is  good
or bad - delfo

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1 Answer

TV - worth fixing or pitch?


Horizontal output and regulator transistor often short out on this model causing a dead condition. Also the resistor right next to the regulators goes open as well. Electronix.com has a sony repair kit to fix the power supply. You just have to check the numbers on your Horizontal output transistor to make sure you get the right kit for your model.

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2 Answers

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