{466} SMPS Output voltage Fluctuation How To Repair SMPS Switch Mode Power Supply Output fluctuating
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- Опубликовано: 3 авг 2024
- 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
if SMPS is dead or no ouput
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if smps have short circuit in output
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if SMPS have a whistle sound or excessive noise or excessive heat
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Super paylaşma..1..like
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.
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
wa'alaikumussalam warahmatullahi wabarakatuh, Salam from Indonesia, is the best for my life to found this channel 🙏🏻
ma shaa Allah
fantastic and superb informative tutorial. thanks for sharing
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:)
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
Mashallah very good explanation sir thank you for your valuable time to teach us
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 !!!
i am thankful for your valuable words, please accept my best regards and special thanks
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❤
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.
Excellent & Beautiful Performance Dear Brother # 157
Many many thanks
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 ⭐✨
boht shukriya piayari behna , khush raho
All diodes secretly want to become jumpers in their next like. Great one! I enjoyed it!
Sir ap bht khobsutat brief krty Hain lykin kindly Urdu m Kya Karin shukria
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
Best regards to you and your adorable work
Most useful technical knowledge for all related person. Thanks
Most welcome dear brother
Nice Video ! as usual my favorite teacher ! God Bless you
please accept my best regards and special thanks
Asssalamualaikum, fantastic tutorial very clear and help a lot for me as begineer. Thank you.😀
eautiful Masha Allah Very nice sharing Stay blessed and stay safe Always be happy
Nice job dear brother 👍Stay safe and happy
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.
Its always a pleasure seeing your video notification. thanks
wow
it is your greatness and my pleasure
please accept my best regards and special thanks
@@HaseebElectronics respectfully accepted
🙏🙏🙏 Best explanation sir... God bless you .
Mashallah very Informative vidoe
Thanks for sharing
Excellent video dear friend, happy weekend!!!
Again I am here to say good evening and happy weekend to my brother. Knowledgeable sharing
thanks a lot dear sister
good afternoon brother very helpfull tutorial for ppl good work 🙏
Wa alikum salam u r good in teaching
Very good and useful information sir thanks for sharing this knowledge to us
So nice of you
excellent analysis.thenks proffesor
special thanks
Excellent thanks for sharing this information
thanks for sharing
do you have a video about induction cooker?
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
Nice. Should D6 be drawn across C8 in-place of the short circuit shown? Edit: Corrected in your thumbnail I see.
Great informative video shared, keep it up.
Thank you very much sir very useful and nice video sir
Most welcome
Thank you for good and clear explaination . you are the best .
You are welcome!
please accept my best regards
@@HaseebElectronics Ok
Lk 32 good job brother 👏👏👏
Yes dear Good job 👏
Very informative video
Super fantastic 👍💯
Nice sharing 👍
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...
MashAllah very good thanks 😊
best regards
Welldone sir, really good video
Many thanks
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 (
wow it is really awesome
it is my pleasure that my efforts are useful for my viewers
please accept my best regards
you are always good explain of smps. what is difference between fly back transformer and chopper transformer
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
Thanks
Thanks dear 😘❤☺
Beautiful information
So nice of you
Hi nice explanation. Could you please explain push pull ,forward converter with design reference and calculation
best regards
sure i am planning to share it soon
Good one...sir ji...
Thanks and welcome
Good work
nice video .thanx sir
Special thanks
100 like very nice
Superb Sir
thanks a lot
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
So nice
Grazie 👍
Nice shirng🌹🌹✅
best regards and special thanks
Awesome video
best regards and special thanks
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.
Awesome 👍
special thanks
good video but why did you not put a diode across the optocoupler and check for heated component.
Can we check if the feedback ckt is ok or not,by giving 5v externally at the output side?
Hello sir how are you exillent video
So nice of you
Walikum Salaam
thanks bhai
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)
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
please check video number 528 that will enough for any type of smps
@@HaseebElectronics tnx for the reply sir tumbs up done sir
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?
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.
👍👍👍 the value of zener sir is 5v?
1N4733A
👌👌👌👍
best regards
Thank You. what Is 1.414V?
it is RMS to peak voltage conversion
Watching bong
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?
welcome dear
did you replaced the same value of capacitor
if it is the same
then change optocouoler
profe tengo una fuente , gpm-200a la salida 5v es normal la salida 12v fluctúa entre 9v y 11v no es constante, gracias
🙏🙏🙏🙏🙏🙏
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.
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
@@HaseebElectronics thank you, i will try that 😀
Salam and chokran Brother haseeb..please can i replace ice2a180z with ice3br0665j Power ic.?!
I didn't understank what the Zener diode was for. Could you explain that again please ?
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.
@@HaseebElectronics Still waiting for that Zener diode explanation. Any plans yet ?
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.
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.
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)
yes dear that video is still pending, i will explain it
@@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.
@@christosmakariou4574 no problem i will explain it in detail with corrections and apologies
👏👏👏👏👏👏👏👏👍👍👍
best regards
You always talk About a flyback converter but wat is or do you mean with flyback.
ruclips.net/video/BCnzNLk91T4/видео.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.
Sir aapke pas top244pn ic ka smps diagram hai to pls send me ya phir is pr video banaye ( ESAB welding machine ) thankyou
S.a. mubarek, why the multiply ac v. 1.414?
Kya...yar dimag ka dahi kar diya...🤨
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
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,, ... ,,....
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
aap apni power supply ka problem aur us ki picture mujhey Whatsapp kr dein
000962795324272
or Gmail id
ashraf4ta4
hello sir why output voltage fluctuation 30-40V (output 12V) what wrong?
Selamın aleyküm ustam çeviriler bölümüne Türkçe yi ekliyebilirmisiniz
ve aleyküm selam. evet kardeşim şimdi ekledim
12 like ur can do it
Sport me
Good work