{466} SMPS Output voltage Fluctuation How To Repair SMPS Switch Mode Power Supply Output fluctuating

Рет қаралды 44,284

Күн бұрын

in this smps repair tutorial i explained how to fix SMPS Output voltage fluctuation problem, How To Repair SMPS Switch Mode Power Supply Low OutPut Voltage, smps fluctuation fault have many causes. basically it happens when smps controller is unable to find feedback or some over voltage or short circuit protection is active, in this condition we have to search the root cause of the fault based on nature of fault
CORRECTION. PLEASE NOTE THAT R6 IS NOT CONNECTED TO THE D6 CATHODE, IT IS CONNECTED TO C8 CAPACITOR. (IT WAS MISTAKE IN DIAGRAM BY ME, WHEN I WAS DRAWING THIS CIRCUIT). I AM SORRY FOR THE CONFUSING SHORT LINK ACROSS THE C8CAPACITOR
Please check other videos on same fault
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it is a TOP214 based flyback converter power supply, in this power supply that output was varying 0 to 1 volt instead of 5 volt. the output was unregulated and fluctuating. top214 ic was unable to receive control voltage (feedback voltage). one zener diode was short circuit in secondry side, which was causing to drop all the output in secondary, so TL431 was unable to find feedback voltage and optocoupler was inoperative, that was the main reason that the optocoupler was not allowing to pass the vcc auxillary voltage to the control pin of the top214 smps controller ic.
i explained the functional description of the circuit with circuit diagram & datasheet. so the troubleshooting becomes easy when we repair with schematic
also i discussed smps basics. after watching this video you can capable to:-
how to #repair #smps
smps output fluctuation
output is not stable or unregulated
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if smps have short circuit in output
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Пікірлер: 144

@pratik.tv.38 2 жыл бұрын

Super paylaşma..1..like

@rogerschelling5668 2 жыл бұрын

Thank you very much for these continuing very helpful videos. I had a refrigerator that had flashing LED lighting as bad symptom. I just shotgun tested diodes and found the Zener shorted. These videos are SO helpful for teaching me CORRECT analysis. I now see that the Power Supply was turning itself on/off (fluctuating) to cause the 14VDC LED circuit to flash the lights. Very helpful video.

@HaseebElectronics 2 жыл бұрын

it is really a most valuable comment for my. it is my pleasure to share my experience so if my efforts are helpful then it is biggest reward for me please accept my best regards and special thanks

@arbabnorway2027 2 жыл бұрын

Mashallah very Informative vidoe Thanks for sharing

@sherinthomas1726 Жыл бұрын

A very good presentation, hats off to the lucid style and voice modulation. I have seen most of your videos and all of them are worthy to view and understand. May god bless you. Thank you very much. With deep love from Kerala a State in south India

@janasmeal7916 2 жыл бұрын

ma shaa Allah fantastic and superb informative tutorial. thanks for sharing

@opposites-369 2 жыл бұрын

wa'alaikumussalam warahmatullahi wabarakatuh, Salam from Indonesia, is the best for my life to found this channel 🙏🏻

@W1RMD 2 жыл бұрын

All diodes secretly want to become jumpers in their next like. Great one! I enjoyed it!

@HarlavanisPanagiotis 2 жыл бұрын

Excellent video dear friend, happy weekend!!!

@anonhollmuller4032 2 жыл бұрын

it tries to restart all over ...thank you! may the day will come for us to speak.....eye to eye, ear to ear. i wish you good luck and live long:)

@user-cs6ly5qe1x 10 ай бұрын

ow thank you for your lecture all of your tutorials are direct to the point and at high quality when it comes to electronics theory and practical. from Philippines hehehe❤

@BlackOpsJuJu 2 жыл бұрын

You are the best Repair Tech Ever and also Explain the circuit so Well Love All Your Vids Thanks for Sharing can't wait till the next one !!!

@HaseebElectronics 2 жыл бұрын

i am thankful for your valuable words, please accept my best regards and special thanks

@AbdulMomenZargar60 2 жыл бұрын

Excellent & Beautiful Performance Dear Brother # 157

@HaseebElectronics 2 жыл бұрын

Many many thanks

@hichamtassi1753 2 жыл бұрын

Nice Video ! as usual my favorite teacher ! God Bless you

@HaseebElectronics 2 жыл бұрын

please accept my best regards and special thanks

@aneesrazakh 2 жыл бұрын

Mashallah very good explanation sir thank you for your valuable time to teach us

@meandbabajan76 2 жыл бұрын

Best regards to you and your adorable work

@AHMADFES 2 жыл бұрын

eautiful Masha Allah Very nice sharing Stay blessed and stay safe Always be happy

@udithasanjeewa9392 2 жыл бұрын

🙏🙏🙏 Best explanation sir... God bless you .

@blackartista 2 жыл бұрын

Its always a pleasure seeing your video notification. thanks

@HaseebElectronics 2 жыл бұрын

wow it is your greatness and my pleasure please accept my best regards and special thanks

@blackartista 2 жыл бұрын

@@HaseebElectronics respectfully accepted

@arekrouet_8218 Жыл бұрын

Asssalamualaikum, fantastic tutorial very clear and help a lot for me as begineer. Thank you.😀

@ShineSakshi 2 жыл бұрын

You not only have good command upon the topic but also have a fantastic command over the Explaining method Awesome tutorial in perfect way Stay blessed my Respected Brother Keep shine ⭐✨

@HaseebElectronics 2 жыл бұрын

boht shukriya piayari behna , khush raho

@Ushasharmakitchen 2 жыл бұрын

good afternoon brother very helpfull tutorial for ppl good work 🙏

@muhammadishtiaq24 2 жыл бұрын

Excellent thanks for sharing this information

@saleemkhan-mx9jw 2 жыл бұрын

Most useful technical knowledge for all related person. Thanks

@HaseebElectronics 2 жыл бұрын

Most welcome dear brother

@khanlalavlogs 2 жыл бұрын

Great informative video shared, keep it up.

@Dr.QaisarAbbas99 2 жыл бұрын

Nice job dear brother 👍Stay safe and happy

@vikrammishra9136 Жыл бұрын

Please make a detail video on led driver circuit because most of house hold use led light and it is demanding a lot no any satisfying video on led driver circuit if it is available your way of learning is massaallah .thanks in advance.

@sonubaba6906 2 жыл бұрын

Sir ap bht khobsutat brief krty Hain lykin kindly Urdu m Kya Karin shukria

@HaseebElectronics 2 жыл бұрын

بہت شکریہ بھائی آپ اردو میں میری ویڈیوز میرے اردو چینل haseeb electronics urdu پر دیکھ سکتے ہیں۔ وہ چینل میرے اردو بولنے والے بھائیوں کے لیے ہے

@ummoibrahimhassan4616 2 жыл бұрын

Wa alikum salam u r good in teaching

@kuchpanktiyajindagiki 2 жыл бұрын

Again I am here to say good evening and happy weekend to my brother. Knowledgeable sharing

@HaseebElectronics 2 жыл бұрын

thanks a lot dear sister

@giorgostexnikos6976 2 жыл бұрын

excellent analysis.thenks proffesor

@HaseebElectronics 2 жыл бұрын

special thanks

@farihabaloch4805 2 жыл бұрын

Super fantastic 👍💯

@Versatiledani 2 жыл бұрын

Very informative video

@k3lanka 2 жыл бұрын

Yes dear Good job 👏

@kahlid-ataya 2 жыл бұрын

thanks for sharing do you have a video about induction cooker?

@vijayakumarkumar9190 2 жыл бұрын

Very good and useful information sir thanks for sharing this knowledge to us

@HaseebElectronics 2 жыл бұрын

So nice of you

@rammohan5435 2 жыл бұрын

Thank you very much sir very useful and nice video sir

@HaseebElectronics 2 жыл бұрын

Most welcome

@zahidainkitchen 2 жыл бұрын

Nice sharing 👍

@anissbencherqui3540 2 жыл бұрын

Thank you for good and clear explaination . you are the best .

@HaseebElectronics 2 жыл бұрын

You are welcome! please accept my best regards

@anissbencherqui3540 2 жыл бұрын

@@HaseebElectronics Ok

@gkhan1446 Жыл бұрын

MashAllah very good thanks 😊

@HaseebElectronics Жыл бұрын

best regards

@poweronadministracion9508 2 жыл бұрын

Dear Haseeb, I never apply mains and power up a failed equipment before I have checked all power semic and electrolytic capacitors. The 5V1 zener you found shorted- dead in 5V section seems to be for overvoltage protection purpose. When you unsoldered it the output voltage climbs to 5.8V and the 12V section increases too. My diagnosys is: 5V section output voltage must be callibrated to 5.0 V so the 5V1 protection zenner never conducts and never slowly heat up and burn. If power supply not suffered an overload problem there s no other reason to get this type of failure.

@ARA-HOUSE 2 жыл бұрын

Lk 32 good job brother 👏👏👏

@ranasinghearachchi1709 Жыл бұрын

Welldone sir, really good video

@HaseebElectronics Жыл бұрын

Many thanks

@rashminaik6039 Жыл бұрын

Good one...sir ji...

@HaseebElectronics Жыл бұрын

Thanks and welcome

@Simon-dd4gk Жыл бұрын

Thanks for the tutorial. I am trying to fix a original Nintendo console with fluctuations to the voltage. I'm basic at this, so it may take me a while to find the fault

@k3lanka 2 жыл бұрын

Thanks Thanks dear 😘❤☺

@dhananjaykhapli2872 2 жыл бұрын

Can we check if the feedback ckt is ok or not,by giving 5v externally at the output side?

@susantaatha6468 2 жыл бұрын

Beautiful information

@HaseebElectronics 2 жыл бұрын

So nice of you

@mdmobasshermimobassher1005 2 жыл бұрын

nice video .thanx sir

@HaseebElectronics 2 жыл бұрын

Special thanks

@zainarabicteaching 2 жыл бұрын

Good work

@Gelf54 2 жыл бұрын

Nice. Should D6 be drawn across C8 in-place of the short circuit shown? Edit: Corrected in your thumbnail I see.

@mehaktravel 2 жыл бұрын

So nice

@rakeshkumarchopra3624 2 жыл бұрын

Superb Sir

@HaseebElectronics 2 жыл бұрын

thanks a lot

@shefqetkaralliu6816 2 жыл бұрын

Grazie 👍

@robertwood4234 2 жыл бұрын

Thanks for all your videos. I've learned alot about SMPS. However, I've been working on a 3 output laser printer power supply that failed after sitting for a year or so. I checked all the caps, diodes, and the MOSFET with no luck. What I finally found was that the hold up capacitor for the controller chip was 47 ufd, as printed on the part, but the ESR was about 200 ohms which is obviously way too high. Once I replaced it with a new part, the supply came up and works fine. So, the lesson learned is that it is not enough to measure only the cap value, but also make sure the ESR is low (

@HaseebElectronics 2 жыл бұрын

wow it is really awesome it is my pleasure that my efforts are useful for my viewers please accept my best regards

@CookingKhabir 2 жыл бұрын

100 like very nice

@arunkumar-bh2dp 2 жыл бұрын

you are always good explain of smps. what is difference between fly back transformer and chopper transformer

@HaseebElectronics 2 жыл бұрын

thanks a lot. every smps transformer is chopper transformer in early days any smps transformer was called chopper, at that time only one type switching topology was used which is flyback. but now there are numerous topologies to switch and we design a transformer as per our requirements

@omarolman 11 ай бұрын

dear sir I like how you explain circuits .I would like to know when you rotate the trimmer at the exit of circuit o regolate 12 V where this trimmer act ? in wich part of the circuit ? regards

@Ramkumar-le4me 2 жыл бұрын

Hi nice explanation. Could you please explain push pull ,forward converter with design reference and calculation

@HaseebElectronics 2 жыл бұрын

best regards sure i am planning to share it soon

@lvwilb5687 2 жыл бұрын

good video but why did you not put a diode across the optocoupler and check for heated component.

@msbbadsha1456 2 жыл бұрын

Awesome video

@HaseebElectronics 2 жыл бұрын

best regards and special thanks

@vijaythakurrfab-jf4439 2 жыл бұрын

Awesome 👍

@HaseebElectronics 2 жыл бұрын

special thanks

@hadirizvi2670 2 жыл бұрын

Thank you for this video, sir we are making a switching charger for 48V 24A lithium iron phosphate battery for ebike, we have arrange all parts except flyback transformer, for 48V 6A flyback transformer where to buy please advise.

@realisticartist9212 2 жыл бұрын

Sir i need one help, we have used one design of smps using ACT364-US-T Primary Switching Regulator IC. Because of it theres no need of optocoupler in design. Bridge is giving 311 volt to primary. We are using bu508 for switching. We are using EPC 13 bobin to drop down vtg upto 5v and 1a. But certainly we are not getting the voltage. Like we have 0 voltage at output. Can you help us where the problem might be.

@tapashaldar1506 2 жыл бұрын

Thank u sir for this great video...All video r very helpful & knowledgeable .. Sir i have a 24volt 5A smps but output volt is flauxtuate in no load condition & some noise occurred also main filter capacitor volt is 153v. What is the fault..Please help me.. Sir hindi main agar video banai to aur jada clear hoga samaj ne mai...Thank u sir...

@TheBassline303 Жыл бұрын

Do you have any idea why the circuit is working fine with lower input voltages for e.g 150 V but breaks down at 230 V? The main cap is fine. Checked all electrolytic caps. power is unstable in the feedback circuit.

@HaseebElectronics Жыл бұрын

please increase the resistor value connected in vcc section, in series with auxiliary winding and the diode. there is a resistance normally 10 ohm to 47 ohms if it is 10 ohm, try with some higher value 15 ohm, 22 ohm or 33 ohm and check result also check startup resistance (connected between main dc capacitor's +ve terminal and the vcc pin of the smps controller) try to increase some higher value (for example if 200K add 10K or 20K and check result) verify VCC capacitor connected at vcc pin of the smps controller ic

@TheBassline303 Жыл бұрын

@@HaseebElectronics thank you, i will try that 😀

@nayanjagirdar8408 2 жыл бұрын

👌👌👌👍

@HaseebElectronics 2 жыл бұрын

best regards

@asmafoodvlogs9954 2 жыл бұрын

Nice shirng🌹🌹✅

@HaseebElectronics 2 жыл бұрын

best regards and special thanks

@farajiabilahi7393 2 жыл бұрын

I was repairing an adapter, a power supply for digital weighing balance machine, specifications for this adapter printed outside of the adapter case shows the output voltage is 15v, the adapter had problem of voltage fluctuation, after following your video I was able to change the Vcc capacitor and problem was solved (no fluctuation anymore), however after repair the when i tested output voltage, results was 22v, is there any explanation for this, what could be a reason and what could I do more to rectify this second emerged problem of voltage output being 22v instead of 15v?

@HaseebElectronics 2 жыл бұрын

welcome dear did you replaced the same value of capacitor if it is the same then change optocouoler

@orlandoalarcon4158 8 ай бұрын

profe tengo una fuente , gpm-200a la salida 5v es normal la salida 12v fluctúa entre 9v y 11v no es constante, gracias

@AbdulMomenZargar60 2 жыл бұрын

Walikum Salaam

@HaseebElectronics 2 жыл бұрын

thanks bhai

@rattamarengineer6113 2 жыл бұрын

Hello sir how are you exillent video

@HaseebElectronics 2 жыл бұрын

So nice of you

@bongelectronics7773 2 жыл бұрын

Watching bong

@gayanwijethilaka9135 2 жыл бұрын

Sir , i have two questios 1) If we found a zenor in a circuit that is completly burn out,that means we cant find the zenor number of that diode how can we find the zenor voltage at that point? 2)If we want to see fluctuations, the analogue multimeter is the good multimeter for that?

@HaseebElectronics 2 жыл бұрын

if there is no number on the zener diode's body then it becomes headache but we can analyse the circuit, sometimes we get alternate to see fluctuations, analog multimeter is not much helpful as it have mechanical pointer so it have no quick response with compare to digital multimeter. digital multimeter have quick sampling so it is better than analog.

@boybravo689 2 жыл бұрын

Good trouble shooting technique for this type of smps sir it is applicable this type of trouble shooting for other type of smps sir? tnx

@HaseebElectronics 2 жыл бұрын

please check video number 528 that will enough for any type of smps

@boybravo689 2 жыл бұрын

@@HaseebElectronics tnx for the reply sir tumbs up done sir

@gurkandemirtas7673 2 жыл бұрын

S.a. mubarek, why the multiply ac v. 1.414?

@adilzahidan5580 2 жыл бұрын

Salam and chokran Brother haseeb..please can i replace ice2a180z with ice3br0665j Power ic.?!

@geraldfactor5781 2 жыл бұрын

👍👍👍 the value of zener sir is 5v?

@HaseebElectronics 2 жыл бұрын

1N4733A

@abcabdi8523 Жыл бұрын

Thank You. what Is 1.414V?

@HaseebElectronics Жыл бұрын

it is RMS to peak voltage conversion

@sanjaykumarsharma7921 2 жыл бұрын

Sir aapke pas top244pn ic ka smps diagram hai to pls send me ya phir is pr video banaye ( ESAB welding machine ) thankyou

@marinvidovic763 2 жыл бұрын

👏👏👏👏👏👏👏👏👍👍👍

@HaseebElectronics 2 жыл бұрын

best regards

@osmancanbaz7312 Жыл бұрын

Dear friend I am from Türkiye I follow your videos I need your helps I am an old technician How to find schematic like this for smps (without schematic its not easy to find the problems)

@dabdoube92 2 жыл бұрын

I didn't understank what the Zener diode was for. Could you explain that again please ?

@HaseebElectronics 2 жыл бұрын

yes dear. i am going a very detailed video on this power supply as a power supply model. and i will explain it in detail.

@dabdoube92 2 жыл бұрын

@@HaseebElectronics Still waiting for that Zener diode explanation. Any plans yet ?

@christosmakariou4574 2 жыл бұрын

Did anyone notice that the Zenner diode's output side, R3 input side, and L3 outputs side, and the SMPS's ground and C8's positive terminal are shown as the same node? I think the schematic is shown (follow the dots where all the lines cross) has an extra dot that should not be there otherwise the second output the one in the middle should be at zero volts. Which one should not be there? Anyone knows? The Schematic is shown at timestamp 1:42. Also please include the link for the video he promised to explain how the output circuit should work right at the end of this video.

@HaseebElectronics 2 жыл бұрын

i salute you for watching my work deeply, i already added correction in video description, that there is a confusing short link acrocc C8 capacitor, the current limiting resstor R3 is connected to +5 volt line (c8 capacitor +ve terminal)

@HaseebElectronics 2 жыл бұрын

yes dear that video is still pending, i will explain it

@christosmakariou4574 2 жыл бұрын

@@HaseebElectronicsI just looked at the description and there is no new comment regarding the short across the 5v cap. In addition at time stamp 17:00 where you discuss the role of the Zenner diode in conjunction with R3 and the optocoupler, its confusing taking into account what you just replied, i.e. that R3 is connected to the Cap + terminal and not with the diode. The role of that Zenner diode is still not clear in this case.

@HaseebElectronics 2 жыл бұрын

@@christosmakariou4574 no problem i will explain it in detail with corrections and apologies

@franskwaks5915 Жыл бұрын

You always talk About a flyback converter but wat is or do you mean with flyback.

@HaseebElectronics Жыл бұрын

kzfaq.info/get/bejne/eKmerbF90J-VhGg.html please check this video, if it is okay please give your feedback and if any query, please let me know. i will discuss in detail.

@Thong-Eit 8 ай бұрын

hello sir why output voltage fluctuation 30-40V (output 12V) what wrong?

@2153Annu. Жыл бұрын

Kya...yar dimag ka dahi kar diya...🤨

@HaseebElectronics Жыл бұрын

sorry bhai agr dimagh ka dahi hua to sorry again aap mere channel ko unsubscribe kr dein ta ka aap ko phir aisa loss na ho. aap ka time waste karney per sorry

@2153Annu. Жыл бұрын

Time waste nhi hua....bas english bol bol ke irritate kiya..... Mujhe koi bhi video nhi milli pure youtube par.... Output voltage problem k liye.. primary section bilkul ok and secondary no output ,, koi bhi shi video nhi mila.. hairani bhi hui aur gussa bhi,, ... ,,....

@HaseebElectronics Жыл бұрын

bhai ye mera English channel he, to is per English he bolta Hoon. aap mera Urdu channel Haseeb Electronics Urdu visit kr saktey hein wahaan ye sabhi videos Urdu language mein apney Pakistani aur indian bhaion keliey bnaata hoon

@HaseebElectronics Жыл бұрын

aap apni power supply ka problem aur us ki picture mujhey Whatsapp kr dein 000962795324272 or Gmail id ashraf4ta4