{581} Why SMPS Fluctuates / Reasons for SMPS Output Voltage Fluctuation Switch Mode Power Supply

[@zehrainternationalcooking3217]

1 like walikum salam pin 📌 please

[@rahil27dz]

Every time i watch your videos i feel myself more capable to troubleshoot any Flayback SMPS. that's becouse your videos are so informative. now i am looking forward to learn how to troubleshoot more complex SMPS with PFC (like computer power supply, laptop adapter, and SMPS with more than 150w....). thank you and please keep learning us. ramadhan kareem.

[@venusvenus9293]

Greetings from Turkey, thank you for taking the time to reply, I will check your points and write to you.

[@HaseebElectronics]

it is my pleasure

[@ashoksamal7894]

excellent, this is the most common fault for me and always i failed to repair. i think your tips will help me very much. thanks a lot.

[@HaseebElectronics]

You're welcome! wish you best of luck and success in every field of your life

[@Erlinda60MixVlog]

fantastic sharing this is helpful for those who wanna learn about This Fluctuation , God Bless you sir Watching From NZ 😍

[@chazlabreck]

I work on these all the time and your description is very good in troubleshooting these power supplies for their usual problems.

[@HaseebElectronics]

it is my pleasure

[@ganesh3205]

What causes some delay in output voltage. Like output cap taking some time to start giving fix voltage. Please help me🙏

[@chazlabreck]

@@ganesh3205 That would indicate the oscillation is not fully comming in stable or in a proper square wave.. If the pulse modulation from the mosfet (high side) is distorted it could cause the output caps to slowly charge up and if connected to any load might not stay running.. I would check any of the small capacitors around the regulation IC and high side of the transformer.. Usual a small cap 1mf to 2.2 or even 4.7 capacitor (several may be there need changing) it helps start and run the oscillator IC,, this IC will turn on and off the driver mosfet.. So main power from AC that is turned to DC by the big voltage capacitor from the line input goes to one side of the transformer then mosfet then is used to ground one side of the primary with the output of the timming regulation IC driving it's gate ... there is a feedback loop from the optocupler that changes the pulse width of the ic to regulate the voltage.. But check into the capacitors in the input... All caps (electrolytic) might be suspect though, even in output..a bad cap there can load down the supply and make it struggle to keep up..

[@ganesh3205]

@@chazlabreck Thanks a lot for sharing the valuable knowledge and time😊

[@chazlabreck]

@@ganesh3205 Absolutely you are welcome...watch this video he really does do a great explanation...but like I said many times these supplys are simple to understand and capacitors in these circuits are under strain and often go bad...electrolytic capacitors are prone to self destruct after some time...chemical breakdowns can be slow and not fail tottaly but get worse and worse and this is why we see odd behaving from these type of power supply..they work in a feedback loop...one thing fails and the whole thing won't work..so it's tricky to trace.. One component bad it won't start up...one component a little bad and it will behave strange.. I wish you good luck in finding the solution...

[@exploreumairshah6806]

ماشاءاللہ ماشاءاللہ بہت ہی عمدہ اور دلکش شیئرنگ ❤️🌹💐🤲

[@HaseebElectronics]

جزاک اللہ خیرا

[@vsagrarwal]

Thanks Haseeb bhai. I could be able to find out fault in my smps by watching this video.

[@jhunyson593]

wow,its so nice and clear,,two time i watch,since yesterday,i like your video's because everytime i watch, i learned a lot,thank you Haseeb for sharing your knowledge

[@HaseebElectronics]

special thanks for your valuable comment your appreciating feedback, means a lot for my efforts best regards and lovely thanks

[@allproelectronics7447]

You are awesome. I have learned so much from you! I have repaired a lot of SMPS PSUs lately and your tips helped me. A ouple of them were fluctuating and some just needed tank caps. Thanks again :)

[@ajaoibrahim1405]

What tank cap? Pls help me, mine is fluctuating too

[@HaseebElectronics]

Tank capacitor is bulk capacitor or smoothing capacitor or main dc capacitor Connected after bridge rectifier

[@jimmyenglish9153]

Yes. the tank cap(s) are the large high voltage caps in the AC to DC rectification circuit

[@santoshmishra5843]

Sir Namaskar, after a long time the complete solution of output fluctuations video sought out and special thanks for your explanation sequence. With regards Santosh.

[@HaseebElectronics]

best regards and special thanks for your valuable feedback

[@gamiwv]

Excellent - as all way - presentation and troubleshooting. Although if someone (me 😊) likes to increase efficiency and reduce THE EMITTED EMI from L2 using a toroidal core and litz wire, what type of material you think it is the most "appropriate" for the core ?

[@machiElectronics]

Very easy simple learn electronics on your channel thanks sir

[@HaseebElectronics]

best regards and special thanks

[@susantaatha6468]

Excellent method used for complex SMPS circuit fault. Thank you sir.

[@HaseebElectronics]

You are welcome

[@vijayakumarkumar9190]

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

[@HaseebElectronics]

it is my pleasure

[@ElectronicUrdu]

Sir, you have solved my problem. Thank you very much

[@HaseebElectronics]

You are most welcome

[@ElectronicUrdu]

@@HaseebElectronics thanks sir

[@HarlavanisPanagiotis]

Wonderful video dear friend, have a happy Friday!

[@olisesundaynduka3689]

Nice one Sir. God Keep up for me from Nigeria

[@shekharvartak1306]

Teaching method is excellent as usual.All points covered.Thanks for sharing

[@HaseebElectronics]

best regards and lovely thanks

[@insanelydigitalvids]

Excellent tutorial. Thank You!

[@muhammadishtiaq24]

Excellent thanks for sharing

[@HaseebElectronics]

best regards

[@snhongo1]

Very informative 👏 🙏thank you Sir...

[@vlogswithraj6491]

Really you are doing great job Weldon keep it

[@HaseebElectronics]

thanks a lot Raj bhai

[@adamrazzor4476]

mann i need to learn these things, pls continue to make more videos, great work 👏👏👏

[@irfanshafiqueelctronics5257]

Sir exelint information video great tech 110%good work s

[@uvarajkavin414]

Nice explanation sir

[@HaseebElectronics]

Thanks and welcome

[@Dr.QaisarAbbas99]

very informative video 👍 stay blessed

[@dellodel9502]

Good video Ggood explanation Good information . . . . Especially with good teacher Thanks

[@rahulpatelgujratahmedabad3497]

Good tiching karte hai 👌👍👍👍👌👌👌

[@HaseebElectronics]

special thanks

[@lemon_noor]

Super sharing excellent 👍

[@HEMANTKUMAR-rz5io]

Your teaching method is too good I have a question Sometimes power supply output volt is ok but on load mains on voltage drop& fluctuate but without load mains on voltage ok than connet load than on load ok At this condition what we should do and hou to test Dso will help us understand it problem in secondary/ primary section ? क्या कोइ step by step method नहीं है जो हमें 2/3 camponent par dout कराये or fault clear हो जाये Please make a video with dso on this topic

[@ayazshah7628]

Thanks for friends entertainment. We can say u "smps guro "please also make detailed vedios on complicated smps like HP dps800gb & dell DPS-480CP .I,ve these smps but faulty.

[@RafiqulIslam-bd4wh]

Your teaching style is awesome. But you should use bengali subtitle to your video for better understanding for the baengali people.

[@calligraphe0125]

السلام عليكم اخ حسيب عودة محمودة انشاءالله

[@HaseebElectronics]

wa alaikum salaam dear brother Ramadaan mubaarak

[@electroniquepassion]

Good job 👍👍👋

[@HaseebElectronics]

Many many thanks

[@CookingKhabir]

Amazing big like

[@BricoolinoSenyor]

اللهم بارك رمضان مبارك

[@HaseebElectronics]

رمضان مبارک علیکم و علینا کل عام و انتم بخیر

[@vongtaynhanaikptt6066]

Nice video well see you well my friend

[@rmjnm]

Nice explanation. Excellent sir.

[@HaseebElectronics]

best regards

[@nyambemundopu1168]

Superb. Wonderful explanation.

[@HaseebElectronics]

best regards and special thanks

[@nyambemundopu1168]

@@HaseebElectronics My pleasure.

[@abughoush5132]

You have an outstanding knowledge

[@HaseebElectronics]

thanks a lot dear brother رمضان مبارک کل عام و انتم بخیر

[@khanlalavlogs]

Great informative and detailed video shared brother. Keep it up. Keep up the hard work.

[@HaseebElectronics]

thanks a lot bhai

[@coloradowilderness3139]

You are a hero in SMPS

[@HaseebElectronics]

i am thankful

[@maliksiyal7357]

very nice brother very beautiful

[@mobilewildrift]

Thanks you so much for sharing the idea

[@YoutubeBaruHamid]

Good job brother 👍👍🤝

[@raoamarjeet5473]

Sir very informative video, Sir please make some videos on inverter ac pcb please🙏

[@derardjaouaheb2700]

Thank.s a lot for your work it.s very good

[@HaseebElectronics]

thanks a lot dear

[@zikermu]

Thanks a lot , Sir , for yours explanations .

[@HaseebElectronics]

You are most welcome

[@reinforce2004]

Very good. Thank you

[@hichamtassi1753]

Very nice and comprehensive video ! I have hard time to increase voltage of some ATX where the voltage is regulated by OP AMPS, can you please explain how do they work ? thanks and Salam Aleikum.

[@AllGoldcollcetion65]

Well explained👍👍🙏

[@mahmudbabul2576]

Thanks Sir, for your informative vedio...

[@HaseebElectronics]

Most welcome

[@giorgostexnikos6976]

excellent analysis

[@HaseebElectronics]

best regards and special thanks

[@FixTronics]

Beautiful explanation

[@HaseebElectronics]

most welcome and special thanks for your valuable comment

[@owenpalma2982]

Thanks again for your informative tutori hasseb... hope u will also have t explain the schematic diagram of split type ac .... samsung for example....more power haseeb... god bless u..

[@mindaugaskazlauskas5530]

Thank you 👍

[@homamalsrour5673]

جميل الله يديم عليك الصحة

[@HaseebElectronics]

اللہ یسلمک و یسعدک کل عام و انتم بخیر بالصحۃ والسلامۃ رمضان مبارک علیکم و علینا

[@marphymarphy]

Nice....Love Ur chanel👍🏻

[@HaseebElectronics]

Thank you so much 😊 best regards and special thanks

[@kitchenqueen2200]

MashaAllah bhai good jobe stay connected i am new

[@HaseebElectronics]

most welcome and special thanks

[@englishrupe01]

Fantastic guide....thank you so much!

[@HaseebElectronics]

it is my pleasure

[@cookingwithadnan5698]

وعلیکم اسلام ورحمۃ اللہ وبرکاتہ رمضان کا جمعہ مبارک

[@TECHNICALPATRA]

👌👌👌

[@HaseebElectronics]

thanks a lot

[@babumanikuttan2258]

Super super info

[@HaseebElectronics]

so nice of you

[@robinTechelectric]

Thank You Sir 👍

[@HaseebElectronics]

most welcome

[@garn6223]

Thank you very much sir 🙏 🙏🙏

[@HaseebElectronics]

Most welcome

[@pakandi9287]

sorry sir, I want to ask. i am trying to repair psu atx with active pfc. the problem is when it is turned on it sounds like a ticking sound tick tick tick (ticking noise), when I check the voltage on the main capacitor (2×150uf 450v) fluctuates, the range is 380-400vdc. but the output is normal and stable. What are the components that I need to check? what causes ticking noise, with the voltage on the primary fluctuate?

[@arunkumar-bh2dp]

good explanation

[@HaseebElectronics]

Thanks and welcome

[@msbbadsha1456]

Very nice video

[@HaseebElectronics]

special thanks

[@ucheinnocent2680]

Thank you very much sir. The video is very informative. Please sir, how can someone get the schematic diagram of power supplies or any other electronic devices? Is there a website where someone can get it?

[@mohammadkhalid6886]

Walekum as salam bhai,,, jazakallahu khaira,,, 👍

[@HaseebElectronics]

best regards and special thanks

[@mohammadkhalid6886]

@@HaseebElectronics RAMZANUL MUBARAK ki dher sari mubark baad,,,

[@Aisi555]

Elco replacement in smps sometimes make you a very rich technician.. Just find the correct company examples in telco or automotives. Nowadays chinese elcos are mostly defect

[@etw1649]

Hello I have a similar PSU that is rated to output +/-12V. When unloaded, the output terminal has +/-15V. When loaded with a PCB board, the output jumps to +/-19V. I purchased a 10 ohm 3 w resistor. When I load it on the +5V rail, the +/-12V rail jumps to ~ +/-26V. Any idea what type of issue this is?

[@anirban3072]

Please provide this circuit diagram ! Very Very good informative video !

[@ahoorapersia4698]

Hello sir thanks a lot for your good explanation. I have a question: in a smps that I want to repair it, with replace x capacitor voltage on secondary side appear on 12V. But when install a load to it voltage dropped and fluctuated to 0-5 volt and load does not work. Please help me. 🙏🏻🙏🏻🙏🏻⚘

[@DjTsuky]

Good work. Please the voltage between drain and source of ICE3B0365J fluctuates when tested, please what is the cause of it?

[@mdazhardware]

Assalam Alaikum, Ramadan Mubarak, I have almost the same power supply 48V 4A, with power fluctuation problem and ticking sound, when I check the voltage on the main capacitor 150uf 4050v the voltage is fluctuating too, an Idea? Thanks in advance.

[@macknumber9]

I have intermittent power loss on a relay...12v supply is dropping out....what could/would be cause? Which components to check?

[@habibkhyata2983]

hello thank u for all videos first please can i ask u about somthing please ihave power12v 5 amps there is 12voltage on vcc ic3842 but no voltage on output what u think the problame ireplaced ic its new now and optocupler new what u think can u helpe me please thanks

[@premkxk]

Sir , the voltage is stable in unloaded condition , once loaded it fluctuates , the capacitors are good . I see the PWM IC VCC also fluctuates only output is loaded ,what the problem in that case

[@raoamarjeet5473]

Nice

[@JunaidKhan-so1fh]

ماشاءاللّٰه sir

[@HaseebElectronics]

جزاک اللہ خیرا رمضان مبارک بھائی

[@JunaidKhan-so1fh]

@@HaseebElectronics جزاک اللّٰه بہت بہت شکریہ

[@HanaartsTamil]

Ea alaikum salam bro support u r ch

[@atiyatech]

Dear sir, first of all ROMDAN MUBARAK. Your every tutorial is very sharp and clear thanks for your great contribution. Sir, I want to make a CVT using triac with phase angle control rather using bulky dimmer. Load capacity 1KVA, Triac part no. BTA41. My question is Is it good practice for doing so? Is there any adverse effect of doing so?

[@HaseebElectronics]

Best regards and special thanks Ramdan Mubarak yes BTA41 series is good to use, because it have a great headroom of 40 Ampere so it can be utilized comfortably

[@dineshlal4505]

Sir, can you please make a video for troubleshooting projector power supply model no PH-AIO-312. I am getting stand by voltage 5v and when I switch on the projector the series lamp glows brightly and goes dim and then glow brightly after 5 seconds and stops. Sir can you explain the above mentioned power supply board working with circuit diagram. During the on time the main filter capacitor is not charging full. I have replaced it also but again same problem. Sir can you help me to fix this problem thankyou

[@lakshminarayandhara5718]

Change the short key diode .. Of out put side.

[@jiouse5881]

Sd6834 no output, voltage fluctuates at the VCC point 12v-14v, no short circuit found, still trying to find the fault.

[@kabandajamir9844]

So nice

[@HaseebElectronics]

best regards

[@kabandajamir9844]

@@HaseebElectronics your welcome

[@aneesrazakh]

Ramazan Kareem dear sir pls give us some of your valuable knowledge regarding software for electronic,s circuit designing in laptop 🙏👍

[@psnvprasad9654]

Tq sir

[@HaseebElectronics]

Best regards

[@peterfrancis3865]

Thanx

[@HaseebElectronics]

most welcome

[@sweetykhanom6689]

Thnxx

[@HaseebElectronics]

special thanks and best regards

[@shefqetkaralliu6816]

👍

[@HaseebElectronics]

thanks a lot dear friend

[@nayanjagirdar8408]

👌👌👌👍

[@HaseebElectronics]

best regards and special thanks

[@bantidasAB9475]

Hello sir uc3843 ic ke pin 1 comparator pin low hone per output pwm off ho jata lekin circuit mein to optocoupler positive reference 5volt se connected hai to ic ka pwm kaise off hoga matlab optocoupler on hone per to pin 1 mein 5 volt aayega to wo ic ka pwm kaise oof hoga

[@HaseebElectronics]

basically optocoupler aik varying signal deta he jo k depend karta he secondary side variation per is feedback control system ki calculation depend karti he k aap kis type compensation use karty hein normally type 2 compensation use ki jaati he error amplifier ki pin per kabhi bhi aap ko voltage nahi milien ge k ye sink current per kaam karta he mein try karoon ga k error amplifier per detail se discuss karoon

[@bantidasAB9475]

@@HaseebElectronics thankyou sir please is par ek video banayiye

[@bantidasAB9475]

@@HaseebElectronics isko aap explain kare

[@digitech5205]

Hell sir. Mera SMPS. Not working on home inverter Dell optiplex pc SMPS But work on Ac And other cpu working

[@directsystems2225]

Wonderful explanation bro. love u 😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍

[@HaseebElectronics]

best regards

[@krishnendu627]

One smps have two photo transistor one photo transistor both side voltage 10.5 volt another acutocupler no voltage both side ..smps not on what problem

[@gamingnoobie1700]

🤒In my computer smps primary transister 13007 ate heating too much in idle after 20 min Help me

[@lakshminarayandhara5718]

Send me the circuit

[@vilir3575]

Power supply circuit diagram downloaded from .. which site Sir?

[@ganesh3205]

What causes some delay in output voltage. Like output cap taking some time to start giving fix voltage. Please share you valuable knowledge here🙏