{444} SMPS OutPut Voltage Low and Fluctuating, SMPS Output Fluctuation
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- Опубликовано: 3 авг 2024
- SMPS OutPut Voltage Low and Fluctuating, SMPS Output Fluctuation. How To Repair Switch Mode Power Supply when the output voltage are less than the rated voltage and it is giving unregulated voltage
in this video i demonstrated How To Repair Switch Mode Power Supply SMPS, When it have low OutPut Voltage with Fluctuation. it is a KA7500 / TL494 based half bridge / push-pull topology power supply circuit, in this power supply the output was 5 volt instead of 12 volt. the output was unregulated and fluctuating. i found both smoothing dc capacitors open circuit. i replaced the capacitors and the supply started working normally.
i explained practically How to repair switch mode power supply SMPS. after watching this video you can capable to:-
how to repair smps
if SMPS have fluctuating output or output voltage unregulated
how to repair mobile charger
how to repair computer power supply
how to repair laptop charger
#smps #output #fluctuation
SMPS practical tutorial • SMPS Switching switch ...
in this tutorial i shared very easy & step by step practical troubleshooting / circuit tracing and fault finding techniques to find the faults in any switching mode power supply.
how to repair smps (switch /switching mode power supply), either it is industrial power supply, laptop charger, adapter, computer atx power supply, server power supply, mobile charger, battery charger, inverter ac board, inverter of solar system, inverter welding machine, led / lcd tv power supply, UPS uninterruptible power supply, washing machine control board, sewing machine circuit board, power supply of dth / digital satellite receiver, switching mode regulator, how to repair smps (switch / switching mode power supplies), very easy, step by step repair and practical troubleshooting & circuit tracing tutorial using smps circuit diagram & block diagram. i discussed how to test smps switching frequency, how PWM pulse width modulator work, what is filter and protection circuit, bridge rectifier circuit & how bridge rectifier circuit work. what is PWM pulse width modulator, how to test pwm signal. what is optocoupler or opto-isolator and what is its function in feedback circuit. what is voltage regulation and how it works in SMPS. switching mode power supply repair tutorial, how to repair / fix switch mode power supply / supplies. dead laptop charger repairing, electrical engineering, basic working of SMPS, basic working concept of SMPS switch / switching mode power supply, how switching mode power supply works, function of FET, MOSFET, BJT, IGBT or switching modules, how switching mode power supply works, most common faults in SMPS. smps output voltage fluctuation, SMPS is fluctuating output or output voltage unregulated , switch mode power supply have no output. smps input short circuit, fuse keeps blowing, smps startup circuit, smps switching frequency testing, rcd snubber circuit, secondary side, feedback circuit, TL431 adjustable reference, optocoupler, auxiliary voltage, vcc or bias voltage, current sense circuit, output fluctuation, voltage regulation. it is uc3842 / uc3843 / uc3844 / uc3845 current mode smps circuit. fuse keeps blowing. current sense in smps & short circuit protection, smps short circuit in output, SMPS dead or no output voltage or have low output voltage. smps ic have no switching frequency, smps no output voltage, how to troubleshoot PWM SMPS controller when there is no switching from MOSFET. if SMPS have a whistle sound or excessive noise or excessive heat, how to repair smps in cpu, how to repair, switch mode power supply, switching mode power supply, smps, switching mode regulator, very easy repair of SMPS, haseeb electronics, smps output fluctuating, smps output voltage fluctuation, output fluctuating, reasons for smps output voltage fluctuation, why smps fluctuates, SMPS OutPut Voltage Low, SMPS OutPut Fluctuating, SMPS Output Fluctuation, smps repair, smps low output voltage problem, smps repair step by step, switching power supply repair this video is translated in french, spanish, italian, telugu, hindi, bengali, portuguese, how to repair smps malayalam, tamil
00:00 Introduction
00:17 SMPS have low output and fluctuating
00:31 i cannot adjust power supply output voltage
00:51 How to disassemble power supply
01:24 KA7500 SMPS Controller IC Power Supply circuit
02:43 How to desolder component from PCB
03:01 How to Test Polarized DC capacitor with multimeter
03:45 How to find Good & bad polar capacitor
06:06 how to install dc capacitor in PCB
07:30 how to repair smps switch mode power supply 
Наука
nice Knowledge sir
MashaAllah very nice video 👍
Bhaijan wakayi ap bahut achhi tarah se batate hain
Meharbani karke bikes ke digital miter ki repairing ke bare me bhi batayen
Thanks Mr haseeb for uploading this video, I hope God bless you all the best
thanks a lot dear brother
Salam M Haseeb. Happy to see a video from you dealing with those nice and powerfull supply. Can't wait to see it schematic and explanati9n on how it starts up.
best regards and special thanks
sure i will share its design diagram very soon
Very useful video.
Keep making pcb repairing videos
thanks a lot
sure i will share pcb repair videos as well
Very good and uesfull information sir thanks for sharing this knowledge to us
Most welcome
Very good information video big like have a great day 😊
thanks a lot
Wonderful explanation. Anyone can learn about SMPS from your lecture
best regards and special thanks brother
Salaam Bhai Saab Aap Ka Channel Aacha Jaa Raha He Khoshi Huyi Liked It # 244
You're a genius. Now I will watch and like all your videos today
best regards and special thanks dear
A great teacher just straight to the point no complications
Walekum Salam Sir very Hard work And very Informative video
Very Informative video great work brother
Wonderful sir. Please explain the push-pull topology of this power supply and how it's different from flyback designs. Thanks for your help and support.
Will upload soon the complete design and will discuss the push pull in detail
Perfect explain . Thank you sir.
You are welcome
Wa alikum Salaam good sharing stay safe stay bless from uk 🇬🇧 🤝🤝🌹🌹
thank you sir your the clear and good explanation . your the best sir
best regards and special thanks for your valuable words
Hello My Talented Bhai
A very Good evening 🙏
You always come with your fantastic stuff
Impressive tutorial as well
My best wishes and a huge like to you
Stay blessed keep sharing 💐
Many many thanks dear sister
Lovely information sir keep up your hard work thanks for sharing. Take care 🇬🇧🇬🇧👍👍
Good content as always. Thank you.
SMPS guru. Good job sir
best regards and special thanks
Each every movement you are explaining with patience. You are a good teacher
I am convinced. Jazakallah
Thanks and welcome
Which means Jazakallah ?
Jazaak Allah means
God will reward you
MASHA ALLAH another superb and informative vlog, a big thumbs up from my side, stay safe and blessed
Thank you so much dear brother
good job dear brother
stay blessed
Thanks a lot Haseeb bhai.
it is my pleasure
Great sharing my friend. Fully watched. Stay connected..
Super sir u have solved my old problem I was facing same problem
wow i am happy that my efforts are helpful
Big like 272
Good morning ji
Very nice technical info sharing
Mashallah !! So helpful
Great 👍 God bless!!
You sir, are amazing! Thank you!
You're very welcome!
Very good job sir ur wonderful thank you sir
best regards
Excellent work dear friend, happy weekend!!!
Many thanks dear friend
lk thank you for sharing happy rakshabandhan bhai 🙏
Good evening. Excellent work as always
best regards
Wow very nice big lik stay connected 🌹🏵💮🌷🌼🌸
This meter is amazing and multi functional....
Your way of teaching has made the video even more learnable and extra ordinary 👍👍 keep it up. Best ever channel of electronics which is providing core knowledge , myths and facts about electronic world..
May Allah Bless you with great Health and peace of mind Ameen Sumameen ❤️❤️❤️❤️❤️❤️❤️
Jazaak Allah khair
What is the model sir ??
And price?
Thanks for your time and awesome work 😀 👏 👍
it is my pleasure
اشكرك
Super explain thanks sir 🙏
You're most welcome
Thanks, great explanation!
You're welcome!
Great tutorial like ever .....
thanks a lot
I'm very surprised to see that there is no protector between psu board and bottom chesis.. If any how the metallic bottom touch the backside of the board, a disaster will happen.. Thank you sir for you practical tutorial.. Lots of ❤️ From Bangladesh
no dear, it have a transparent insulator sheet, moreover it have mounting pads in bottom side and in vertical mounting
it have some good design engineering
i will show in upcoming video, in that i will discuss its circuit diagram and its working principle
Thank you sir very helpful
Thanks for the video. Greetings from Mexico.
best regards
Tnx sir. God bless you 🙏🏻❤🙌
it is my pleasure
Yes sir, It is great if you dicsuss the design in future.. i am waiting for it..
Good content as always
best regards and special thanks
Assalamualaikum dear brother.. MashaAllah excellent and informative upload as always. You always provides helpful tutorials on subscribers request... May Allah bless you with lots of happiness and success..
Wa Alaikum salaam dear sister
Allah bless you and your family.
it is result of blessings of Allah and prayers of my well wishers
stay blessed dear sister
Very helpful vlog👌
Thanks a lot
Thanks. Good explanation
best regards
Thanks god bless you
amazing bro. well done. i was looking everywhere to fix my psu. i will try it tomorrow in my psu. my psu is 220v ac/24v dc and it gives 3.6v although capacitors looks clean.
Best of luck
@@HaseebElectronics my capacitors are 560micro farads I desolder them and measure them in multimeter it gives 530 microfarads. I think the problem is not with the capacitors. what should I check? may you please help me?.
capacitors are good
within range
check RCD SNUBBER across primary winding of the transformer
Good video 👍
Nice upload
Thank you so much 🙂
On Dave Jones youtube channel (eevblog) and some other channels (Diode Gone Wild)It's been shown that a lot of chinese SMPS they use scraped capacitors from old power supplies, just change nylon shield and put some fake logo like nichicon, but with capacitance way out of specs in terms of ESR and capacitance. It's good to be aware of that and put some tested caps with ESR and capacitance within declared specs (usually +-10% capacitance and ESR of
Hai brother I am from Kerala, your videos are very helpful thanks a lot, can u do a video about STR type power supply which comes in Sony DVD home theatre, it would be very helpful for us , once again thanks lot brother..........
Brilliant fix thanks
best regards dear
Superb 👍👍👍👍
GOOD INFERMATION SIR . SAME COMPLAINT I HAVE ONE SMPS 12 VOLT 30 AM. OUT VOLTAGE NOW 6 VOLT
did you fixed it. or still it have problem
please reply
Sir waiting for detailed video of this smps. Working of two transformer and push pull topology. Thanks
Waiting for explaination how it works :)
yes dear. i will explain as soon as possible
Thanks Haaseb for your kind explanations. But there are some times when the fault is way more complex. For example, now I'm struggling with a switching power supply, which uses a MIC38HC42 IC in a very strange configuration. Since is not possible to me to find any schematic application for this IC, I wonder if it would be possible to feed externally to the IC a supply voltage to let it turn on and see if the oscillation is present before powering it with the mains supply. I would like to test it this way to void the blowing out of the power mosfets (2 present) brand new. The lamp trick did not work since even with a 25W lamp is enough to desttroy again the mosfets.
AOA Sir, I watched your most of the videos, they are very useful and full of knowledge. Thank you very much for providing such precious knowledge.
Sir, I have a question here. if a power supply is giving approximately 12 Volts and not fluctuating means stable, but we also call these as low voltage because when this power supply was new its adjustable voltages were nearly up to 14 volts. But now maximum voltages are 12 which cannot be increased through preset/adj/. What's the reason of decreasing voltages of such power supplies because when we take a physical examination of each component, everyone is looking good and not damaged. I want to know the reasons of decreasing output voltage and the method to fix it. Thank you in anticipation.
Wa alaikum salaam dear brother
it happens most of the time, it causes
1. leakage in power capacitors, in capacitance meter it will give good reading, but at full rated voltage and continuous operation, it provide internal leakage. it can be examined using ESR meter
2. due to devalue factor of resistors and their temperature coefficient
3. sometimes due to leakage inductance of the transformer
4. in some cases the drop in permeability of ferrite core used in transformer, as it is made by magnetic powder. some materials loose their magnetic properties in percentage, that may cause in loss of conduction and increasing core losses and copper losses.
5. in some cases cut off frequency of EMI filter involves in attenuation and sometimes it produces ringing factor, that can cause to disturb the current in dc rail
6. improper design of Snubber circuit may be one cause, when it doesn't discharge the primary properly,
these are some key problems of loss in power
Hello, thank you for your informative videos. My problem is with this power supply. I do not receive the voltage of 20 volts before ic tl494 and that if possible the pulse transformer of the same model Show how to wind it
*Thank you*
Very nice and useful information sir, I have a problem in my computer smps, it gives all voltages correct but when smps connect to load then the main chopper/ transformer makes same noise like shi... and voltages gets drop. so try to help me out.
please check and verify the output side capacitors, may be some of them have leakage
@@HaseebElectronics Thank you for quick help and replay sir, as you advice I checked the output caps, all caps are good.
Super video
Nice video
Thanks sir ji...
most welcome
Nice video sir
thanks a lot dear
Good one..
thanks a lot
Thanks sir.
Most welcome
Thanks sir....
Most welcome
144 like wow supperb
Many many thanks
ws wr wb MASHAALLAH
Good working
best regards and special thanks
Assalamu Alaikum sir,aye curcit Kaise work Karta Hai Iske Upar ek video banaaiye🥰
Wa Alaikum salaam bhai
me zaroor is per detail me video bnaaoon ga jaldi
Dear very good informative for us.
Pls make vedeo on 12v 60watt 5Am
Strip driver smps type driver.
Our this driver out put only 3 volt what is problem can reply
Tks awaiting your reply.
hi excellent video i have a same problem i change same capacitor and small capacitor fault still have but voltage not Fluctuation 6.56 v
👍 Grazie
special thanks and best regards
Good
Thanks
best regards
Sir this video is really informative. Can you make a video about working principle of this circuit, it will help me to trouble shoot one pcb in my hand. Please.
I have same circuit but the problem is output in millivolt. I need to know the mosfet numbers also. Please help.
Hi sir..,Good afternoon
best regards dear
nice
thanks,,
You're welcome!
Thank you, Mr. Haseeb. What is the reason for hearing a loud buzzing (zzzzzzzz )in the transformer in the same power supply? I replaced the capacitors and the same sound is coming out of the transformer?
Super 🧿
best regards
👌👌👌👍
best regards
Lk 60 👍👍👍😊
thanks a lot
thank you, very well explained.
for testing purpose only, can i replace the caps with lower capacitance? if the broken cap is 100uF, is it safe to replace it with 47uF (same voltage rating) ? again, this is for testing/diagnose only to make sure that it is indeed the cap is the broken one..
welcome dear
yes for testing purpose with no load we can install low value capacitor with same voltage rating or some above voltage rating
@@HaseebElectronics hi, thank you for confirmed it.
Wa. Salam
thanks a lot
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. 🙏🏻🙏🏻🙏🏻⚘
👏👏👏
best regards
good
best regards and special thanks
Sir ek baat poochni hai, maan lijiye hmare paas 12v 15A ka 180watt ki SMPS hai, agar hum ispe sirf 90watt yani ki load daalein to kya ye AC se poori 180 watt power khinchega ya fir 90watt power khinchega?
Nyc
best regards dear
MashaAllah bhut mushkil kam h
Sir please reply me i have an Tv power supply but have fluctuations in the vcc capacitor and in diode near the vcc capacitor no output and the bulk capacitor don’t fluctuate how to troubleshoot it please
please check the vcc capacitor (capacitance or its ESR value)
check secondary side of the SMPS transformer (might be some regulator is bad) which is causing the feedback failure, which is causing the smps IC in reboot mode
Sir I have a 36v 10A supply in which E13009L NPN transistor is used. Instead of this which NPN transistor can we use. Thank you.