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Tv circuit diagramlg sampoorna

Str 6707 not working

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If you wish to get the schematic diagram of the SMPS to LG, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window. Schematic diagrams are in PDF, and cannot upload it by this window.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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LG tv str w6754 glows and short. power supply is not working?


Replace that STR. Before replacing, check all the related component/s at the SMPS section [HOT] side. any one damaged component will make the replaced STR to fail. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
SMPS Circuit diagrams [STRW6754] of many popular brand TVs and other devices are given.
Search the site by type in the "BRAND NAME" or the STR number; of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Sep 04, 2016 | LG Televison & Video

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STR 6707 give output voltage more than 110 voltage of TV Onida model BLACK


Check it with load. If it shows more than 112VDC, the IC is faulty. 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/
Check all the related components at the SMPS section circuit, before replacing a new IC.

Jul 15, 2015 | Televison & Video

1 Answer

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

3 Answers

Model Sony KV-G21q2S Problem-STR 6707 has been changed. After an hour the went down. The fuse and STR 6707 are working. But no picture no sound. When plug in it gives "boo" sound for few...


This is the SMPS Power suply drive and the IC fails ONLY if there is fault in the circuit. You need to check on the SMPS section
check this link below for tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Next you need to check if the LINE output transformer has failed. If so this will have a higher current drain and so switch off the SMPS unit. check for the EHT drivers, capacitors in the HT circuit.

Jun 25, 2011 | Sony FD Trinitron WEGA KV-20FS120 20" TV

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

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

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

WIN VISTA Ultimate does support Philips SAA7130 TV Tuner/FM Radio/Video...


I couldn't get to work in Vista. So I tried in linux and My SAA7130 is working great in Ubuntu linux. bye vista.

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