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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.

Model ts21sf1k. i tried to replace power ic regulator. but still no power

Posted by leonardo on

  • De ice
    De ice Jun 24, 2015

    you check the fuse and for bad caps

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1 Answer

The Knight

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  • Sanyo Master
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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/

Posted on Jun 24, 2015

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Make sure your main power supply from the wall has proper voltage, also new parts is no garuntee they work, check their input and output

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What's your problem?


Problem in the power supply. Check connections around voltage regulator ic, will be mounted to a heat sink marked with str or strz or mxaoi. Check for bad connections in power supply, Voltage reg ic is very common to go out in Sony's.

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Did you check if there's a B+ voltage at the STR regulator.If there's a B+ voltage at the regulator check if there's B+ at the playback aand at the horizontal output transisor.

Aug 20, 2011 | Televison & Video

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I have sony J21mn11. problem not power on only red lit led only.i check all the components on the power supply area and horiz. output D1878 all are good. there is power IC STR S6707 on power supply area. i...


If you have a digital tester or analog try to check the voltage reading from the power supply if high or low or no supply.Check first following voltage location and section. * Check the AC voltage from ac cord to fuse and before the bridge type diode. * Check the DC voltage after the bridge type diode.if normal voltage. * Then check the voltage into the filter capacitor to regulator ic.the power ic.If theres a input voltage in the power ic,check the output voltage going to harizontal output.If no output the problem is you power output.You need to replace it.

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What is the STR number used in power supply of tv model no kp-w41mh11 sony projection tv


Hi adnan_khan_g,
KP-W41MH11 Voltage Regulator IC is the STR81159A.
Hope I helped you.
Have a nice day!
Thanks for using Fixya

Mar 04, 2011 | 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.

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1 Answer

TV red light blinks seven times. Is this a code for the problem?


Hello
Seven continous blinks of standby light in Sony TVs indiates that there is some problem in power regulator side or on horizontal output side. It is due to high voltage shutdown. When the [EHT] voltage ie Extra High Tension voltage given to the final anode of the picture tube exceeds 33KVDC [33,000VDC], this happens. The cause may be in the power regulation side in your TV. Normally Sony TVs are working at about 120 to 135VDC. If voltage at this DC rail exeeds, EHT said above will increase beyond its limit, and CPU Ic inside your TV will detect it and shuts the whole system down to prevent further damages to more components. This is happening in your TV now.
This process is called saftey shutdown.
To rectify this problem you have to open the TV. Proper care should be taken before opening it as you are going to work with an electrical equipment, which has very high voltage points are there inside. All precautions must be taken before opening the TV.
Normally this fault will be due to the poor regulation of the power supply section inside your TV, that causes a voltage higher than normal is comming into the main circuit from power supply. STR type regulatros are being used in Sony sets for this regulation purpose. You just locate the power regulation side, and check for any loose solderings to the legs of the STR regulator or its nearby components. You must have some concept of sodereing in this matter. Components fitted on the power supply section will heat up while TV works. Ater long use, the soldering at the legs of the heated components may get loose. We can't detect loose contact exactly where it is. So it is a good practice to resolder the sodering of suspected components, and we in practical servicing field also do this trick.
If it doesn't help, the STR fitted inside may faulty. Desolder it out from the board and go for a same type and number. Replacing it will solve the problem. Ok

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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

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3 Answers

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Your problem could be the Convergence board is loading down the power supplies and will not let the TV set come on, or the power/deflection board, part number AA94-08574A, or the STR type regulator IC, part number AA13-00105A. If you locate the convergence board, unplug the connectors, and see if the set will come on. if the set does come on, replace both of the STK convergence IC's at once. The part numbers for those IC's are STK392-40. You can get the original replacement IC's from MCM electronics for about 15 to 16 bucks a piece. Do not use the less expensive STK IC's as they are not the same. the replacement IC's should have the name of SANYO printed right on the face of the IC's. Good Luck

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1 Answer

No power, LED blinking, Low voltage regulator IC?


check for bad solder connections then check all fuses the ones that look like resistors too get back to me

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