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Can i get onida CO21BLDU Schematic . no power suppely out to horizondal section ,but 330v store n capacitor{using STR F664 IN SMPS how to drive supply to h out

I checked the 110v across de coil there is no out put but at the tme of power ON LED Blinks once

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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/
Schematic diagrams to many popular brand devices are given.
Type in the brand name to your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Posted on May 01, 2015

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Supply through sm transformer to diode, 100/160 v capacitor ,,,then fusible resistance to EHT pin of primer winding to bu transistor,,,voltage dropage due to bu short circuit

Posted on May 01, 2015

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1 Answer

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

2 Answers

Power supply board not working, what section i have to cheke...?


Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

May 03, 2016 | Televison & Video

1 Answer

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

No power suppely out to horizondal section ,but 330v store n capacitor{using STR F664 IN SMPS how to drive supply to h out


supply through sm transformer to diode, 100/160 v capacitor ,,,then fusible resistance to EHT pin of primer winding to bu transistor

May 01, 2015 | Televison & Video

1 Answer

Onidi crt tv Dead condition At the tme of swithing power led blinks once No power suply in hout Bt 310 v across capacitor Hw i ll chech There is no out in choppt to hout section model CO21BLDU onida


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. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Apr 30, 2015 | Televison & Video

1 Answer

In onida ky thunder strf6654 getting burn,fuse blown when also change of str.????


Check all the associated components at the power supply regulator section circuit; especially check the zener diode/s. Replace them. Replace the STR only after replacing these components. There is a chance to these components too can damage, when the original STR has burned out by any reason. If you wish to get more, about the schematic diagram; check the site linked here. Type in the number of STR in its search box, or Pull up previous posts, either by type in the Brand name to your set in its search box, or view it in Mosaic / Timeslide / Flipcard option. http://electronicshelponline.blogspot.com/

Aug 06, 2013 | 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

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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