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No power supply regulating and str no x6757 - Computers & Internet

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The STR or voltage regulator is probably bad. If you are not familiar with soldering and using a multi meter for troubleshooting then I suggest buying another power supply they are not too expensive. Try e-bay. Good luck

Posted on Mar 30, 2014

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Posted on Jan 02, 2017

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Hi! i have sanyo televesion, model ts21sf1k. the problem is no power. i replace the power ic regulator STR w6753. but still no power. no voltage out in power supply.


SMPS circuit is not functioning. Check and replace all the associated component to STR. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Jun 24, 2015 | Sanyo Televison & Video

1 Answer

Is str f6707 the right power supply for daewoo tv model DTU-14d3


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/
Schematics to power supply regulator section to many popular brand TVs are given. Search the site with the STR number to your TV.

Dec 31, 2014 | Daewoo Televison & Video

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My china crt tv uses str w 6554 but has a fault in power when you fuse it with a bulb it blick the bulb bright.


Check the entire circuit around the STR for any faulty component/s; especially to used Zener diodes. You should check each component in the power regulator section circuit, before replacing an other STR. Any of the faulty components at its circuit, might damage the new STR too. Be care.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/
Power supply regulator section circuits to some popular brand TVs are given. Search the site by the number of STR, used at your TV.

Jul 20, 2014 | Televison & Video

1 Answer

What is the number of str ic,regulator power supply a 14 inches sharp tv. model primo sharp tv 14 inches


Try the site linked here. It has schematics of power supply section to many popular brand TVs. http://electronicshelponline.blogspot.com/ Hopes it will help you to check out the number of the STR.

Dec 18, 2013 | Televison & Video

1 Answer

Sony TV has a power supply problem both ics irf1b7n50a in the power supply section are all shorting which number could I use as an equivalent. is there a way I could use a power modular with two power id's


Hi Saidi
Have you checked all the other components used in the main power supply regulator section circuit, before replacing a new STR? You should do it. There should be a reason for the failure to STR. You should find it, and rectify it, before replacing an other STR. Check all the small components, resistors, zener diodes, small value ceramic capacitors etc: Make sure all of it are OK. Especially give a keen attention to zener diodes used; if any. It will be best to replace these diodes, even if you do not find any fault with it with multimeter test.For more information go to http://electronicshelponline.blogspot.com/
Power supply schematics to some popular brand TVs are given. Pull up older posts. Good Luck.

Nov 26, 2013 | Televison & Video

3 Answers

No Display, no sound- not working, showing dead. But input Power is ok. Picture tube filamment not getting power. model sony KV-2192M3


Hello
Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
If any further assistance you needs, get me through Fixya. Ok.

Nov 27, 2010 | Sony FD Trinitron WEGA KV-21CL10 21" TV

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TV won't turn on, standby light blinks seven times over and over


Hello
Seven continous blinks denotes that your Sony TV has some high voltage more than normal inside its final anode of your TVs picture tube.. When high tension volltage exceeds abve 33KV [33,000VDC], to the final anode of the picture tube, TVs microcomputer Ic will detect it and get it shutdown, to prevent it from further damages.

You have to check its power regulator section for this fault. Usually Sony TVs uses STR regulated power supply regulation in their TVs.
You must open the back cover of your TV, and locate the power regulator section, sometimes be as in a seperate board or in the main board itsef. Check for any loose solderings it it. As components in the power regulator system will heat up during working. As it heats up and cools down for several times, some loose soldering may occure in it, and is usual. It is difficult to locate the exact point of loose, and is risky too, as the power supply regulation side is directly connected to mains supply and will always be "Hot", so i recomends you to resolder all the points, especially the points of high watt resistors in it. Resolder the the STR legs also. Sometimes the STR itself may need replacement. If so go for the same number and type. This might retify your problem.
Normally Sony 32" TV has a working voltage between 125 to 140vDV, at the secondary side of the power regulator. It it exceeds this type of problem will occur.
Take all precautions we take when work with an electrical equiments. Keep chlidren away from you, and note even stand beside you when you do works. Keep an adult beside you as a precatiounary measure. As high as 27KVDC [27,000VDC] points are there inside your tv, while it works. Take care. Never use metal a metal chair. Ok

Oct 26, 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

1 Answer

Have a sony trinitron tv which turns off automatically and sporadically on average every 15 minutes


Hello
Most of the sony Tv power supplys are based on STR type regulators. Regulation of an STR is very accurate and if any overload inside the ciruit board of the TV, will be sensed by the STR and will shut off all the supply to the system itself. From your complaint we understands that there is some sort of short, not a direct short, is in your tv. Usually it may related to horizontal output transistor. At first it will work fine, but as time pass on, it will get over heated, passes more current, and place a short like circustance to the power supply rail itself, and as described above, STR will sense it and will shut down the system. After some time, say after 10 or 15 minutes, after the heat generated has gone off, the TV will again switch on, and the cycle will be repeated. You just call a technican and keep this in mind, and ask him to repair the same.

Oct 18, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

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