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No power replaced fuse ,str and resistor 10w3.3ohm

The tv keeps on blowing the fuse so i replaced the components on top and now there is no power to the screen

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Check and replace the horizontal out put transistor

Posted on Nov 26, 2008

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The components you have replaced fixed a short in the circuit which caused the fuse to blow. A different component is still causing problems. The components you replaced may have failed in a different way so as not to blow the fuse or you are close to fixing the problem. It could be a high voltage component failure or worse a picture tube failure.

Posted on Nov 26, 2008

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What could be a cause of my sony trinitron 21''crt tv it's problem is fuse burned and STR is shorted when i change it it burned and shorted again ?


If STR is found damaged, you should check all the assciated components with it; like resistors, zener diodes etc: before replacing a new STR. All such components should be checked individually [out from the circuit]. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

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Do you have the schematic for this TV?

Oct 29, 2008 | JVC AV-20420 20" TV

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The tv will not power up, nothing happens when i press the power button


Hello
The power supply section inside your TV is not working. It may be due to a blown fuse, or its inverter secion itself. You have to open your TV to detect and repair the fault. If you are aware in electronics, open it, and check the fuse first. If it is found blown up, replace a new one with same rating. Do not use an other rated fuse, as it may damage more components, if there is a fault inside the circuit section of the power inverter board. If the newly inserted fuse also blow out, as you switch ON the TV, never put any fuse there, and it must be due to some fault to that section, should be checked well. Without any reason, a fuse won't blow up you see. We must find out the reason for that and rectfy it before replacing an other fuse in place. Normally, rectifer diodes, inverter device, a transistor or an STR, whatever may be the case, should check with its schematic diagram, and replace them. Whe power reguator [inverter] side get a fault, it will cause more component in that section to be out of order. So you have to check each component on that section before replacing and switch ON the TV.
If you have a sound knoledge and measuring instruments with you, you can do it by yoursef at home. If not, get it repaired with an experienced service technician. OK.

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1 Answer

Dear Sir, I'm Bangladeshi Tv Techanician, Sony tv


Hello

Before replacing the STR, have you checked all the components related to it? When STR burns out some of the nearby components, such as zener diodes and other resistors will also get damaged. You just replace the components, especially, zener diodes, in case it does not show any fault, replace it. Connect a 100W filament type bulb in seris with the power supply, and switch on the set. This will reduce the power concumton at the begining, and we can check its heat effect also, after all are ok we can connect directly. Check the smoothing capacitor at the secondary 130VDC. Replace it also. If you need furthermore assistance, feel free to contact me through Fixya. I'm an Indian, residing at Trivandrum, the capital city of Kerala State.

Dec 11, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

In my tv fuse is blowing off immediately


Hello
If fuse blows off immediately, i means that there is a short circuit occured in your telivision. This can mainly due to some diodes or regulators inside your tv. An overvoltage, spikes, ie [sudden high rise and go low], in the supply votage in your home, could damage power supply regulator components inside your tv.
All Sony Tvs has high accuracy power regulating systems inside. It is an onboard assembly, usually take 1/4th of the area of the TV. In older Sony TVs, this section was built in with use of transistors of different types. But your tv is not so old, so its power supply system is built with an STR, an Ic meant only for power regulations. Normally it willb numbered STR S6707, STR S6703 etc; according th the working voltage of the main board, and screen size of the TV.
This STR may get shorted due to power fluctuations, or any other reasons. A I mentioned above this is an Ic look like small squuare biscut of about an inch in square, and will be black in colour.
The rectified main power supply is given to it via an SMPS transformer [Swiched Mode Transformer], and the Ic will swictch it on and off at the rate of sbout 25KHz or more, and this transformeres secondary voltage is used to power up the other part of the ciiruit board.
If the fuse is blowing as soon as the set is switched on, this Ic will be faulty [Shorted inside]. If you put an another fuse, it also will blow up due to short. It is not good to play with power supply system by doing this as it may harm to other components also.
You have done it I thinks. Here in India, we gets 220VAC as home power supply. Sony TVs used here have a fuse rateing of 250V 3.5Amps. If your household supply system voltage is also this you must put only this rated fuse. If it is 110 or 120VAC, the fuse rating may differ; and will go upto 6 to7 Amps. More than this rated fuse should not be used.
You just do one thing. Just open the back cover of the TV, locate the power regulator section, and chech whether any main rectifier diodes for leak. There may four of them. In some sony Tvs, rectifier stalks are used. Check it for leak. If thery are all good, measure the resistance across the main filter capacitor with a multimeter set in Ohms range. If the STR said above is short, the meter will give full scale deflection. Unsoder the STR and pick it out after loosing its fixing screws to the heat sink. Again check the resistance accross the main filter capacitor. It must sho a low deflection or no deflection at all. Never replace the STR with a new one as there may be some other faulty components in that section. Usually when STR fails, there are some Zener diodes, Wire wound resistor etc will also gets shrted. If you replce the STR before checking them for fault, the STR you puts in will get shorted as you swich on the set. It will take just 1/100 part of a second.
So check all the components related with power regulator system, and then only repace the regulator. Caution: Keep chlidren away from you while you open the tv. Never touch any part of the circuit board while power supply is there. Plug out from the wall socket each time you touch the printed circuit board. As your Tv screen size is 32", an approximate of 25KVDC [15,000VDC], will be present at the first anode of the picture tube while it is working. It is too dagerous to contact.
If you haven't through knoledge, skill and patience, never try to repair it. If you knows to follow its schematic digram, buy one book and follow the circuit.
Keep an adult beside you as you try to repair your set, as a precaution.
If you have any doubt, report to Fixya, they will give me alert. Ok

Oct 20, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

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