{772} How To Repair SMPS Step By Step

Рет қаралды 67,732

Күн бұрын

in this video number {772} i explained and demonstrated How To Repair SMPS Step By Step. How To Repair SMPS || SMPS Repair Step By Step || Switch Mode Power Supply . it is UC1842, UC2842, UC3842, UC1843, UC2843, UC3843, UC1844, UC2844, UC3844, UC1845, UC2845, UC3845, based current mode controller switch mode power supply circuit. these ics are most commonly used in battery charger, power supply circuits, laptop charger adapters and tv power supplies. i demonstrated how to troubleshoot using multimeter and oscilloscope. because a smps circuit is electronic components based power converter, which takes line voltage, then converts it into dc voltage. afterwards these DC voltage are chopped in high frequency based pulse width modulation PWM based IC and the power mosfet, which are passed through a power transformer, after transformer, it will rectified into dc voltage. a feedback circuit is incorporated to maintain the voltage regulation. some circuits have a current limiting / current regulation circuit.
#howto #repair #smps
Download UC3842 SMPS circuit diagram
bit.ly/3V6gYNk
bit.ly/3uc8wB0
bit.ly/3a3KukQ
bit.ly/3NwZqFA
BOM bit.ly/3OiSTjJ
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. i explained basics of smps working and understanding repair smps. 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,
step by step repair & practical troubleshooting & circuit tracing tutorial using smps circuit diagram & block diagram. how to test smps switching frequency, what is PWM pulse width modulator, how to test pwm signal. what is optocoupler or opto-isolator and its function in feedback circuit. how to repair / fix switch mode power supply / supplies. basic working of SMPS, basic working concept of SMPS switch / switching mode power supply, 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. fuse keeps blowing. 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
00:00 How to repair UC384x KA384x SMPS controller based Power SUpply CIrcuit step by step
01:42 how to download circuit diagram of any SMPS power supply circuit
02:45 3842 smps circuit explained and how to trace the circuit
03:41 Inrush current protection NTC circuit
05:42 fuse keeps blowing in smps, input short circuit
08:07 how to perform cold testing for power supply circuit
08:16 how to find short circuit in smps input circuit
09:36 How to Test NTC negative Temperature Coefficient resistor
13:58 UC384x Startup circuit explained
15:04 How to Test SMPS Controller IC
15:43 how to test MOSFET gate drive signal using multimeter and oscilloscope
21:06 how to check capacitor charging discharging
25:46 How to Measure switching frequency of uc 384x PWM ic
33:13 SMPS output have very low output voltage

Пікірлер: 220

@ivanviduljevic Жыл бұрын

The best way to learn from this video is to get just pen, print out data sheet and take all notes and go along, pause rewind until you get it on the paper, take all notes, pause rewind again! And conforme that you know what every resistor or diode does in circuit and then you move to live PCB! When i start electronics i didn't quite understand what is "start up circuit for IC" and that cause me a lot of trouble. But Haseeb makes this grate videos explaining every step, so consider yourself lucky to have this kind of knowledge just served out! Thanks Haseeb.

@HaseebElectronics Жыл бұрын

best regards and special thanks for your valuable comment

@transparentlab8318 9 ай бұрын

1741G,is it opamp?

@transparentlab8318 9 ай бұрын

@@HaseebElectronics1741G ic, is it op amp

@trone32 Жыл бұрын

You are the Guru when it comes to SMPS repair. I don’t think anyone comes close to your knowledge on YT

@HaseebElectronics Жыл бұрын

no brother i am still learning thanks a lot for your valuable comment

@W1RMD Жыл бұрын

Great video! So there's now NO need to ask you 10 times how to fix my tv! You've covered this subject better than anybody. If I can't figure SMPS's by now, I probably shouldn't be taking anything apart. Thank you for taking the time to take what once was a completely foreign circuit to me and making it understandable! Best regards!

@HaseebElectronics Жыл бұрын

it is my pleasure. i am thankful for your valuable words please accept my best regards

@W1RMD Жыл бұрын

@@HaseebElectronics I've been recovering from an eye injury. I had to take a little break in watching videos, but I'm on the mend. I'm greatfull for God's healing. I appreciate your kind words!

@HaseebElectronics Жыл бұрын

you will recover soon take special care for yourself and stay away from blue screens specially mobile screen is a biggest enemy for our eyes wish you happy l, healthy life 💖 and fastest recovery

@W1RMD Жыл бұрын

@@HaseebElectronics Thank you! I am recovering at a fast rate. I was grinding metal under my truck and the goggles weren't tight against my face. Aluminum oxide cutting wheels can be VERY dangerous! I got a full face shield I will wear in addition to goggles. Thanks for your prayers!

@mohamedniyaz7530 10 ай бұрын

Haseeb you are the best i have come across in circuitry explanation Keep up your excellent work

@nirmanmulalic1824 Жыл бұрын

May Allah almighty bless you and and give you all the best in dunya as well as in ahirah for your helping people to understand these complex concepts of electronics, esselamu alaikum wa rahmetullahi wa berekatuhu.

@abdulzaheed5272 Жыл бұрын

Wa aleikum salam varhmathulla...jazzk allaha kairan...good explanation bro

@HaseebElectronics Жыл бұрын

best regards and special thanks

@akierum Жыл бұрын

Best video on smps troubleshooting i've ever seen

@HaseebElectronics Жыл бұрын

best regards

@NorthElectronFix 5 ай бұрын

No university teach like this man .thanks

@krunalthummar Жыл бұрын

Very good explanation in depth of each components and complete operation. How we get output and why we do not get output if any problem in parts! Thank you for giving scientific level of knowledge.🙏🙏 Loves from IND.

@susantaatha6468 Жыл бұрын

We are also following yous foot steps. Many many thanks for your motivation information.

@HaseebElectronics Жыл бұрын

So nice of you. it is my pleasure. i try to share the easiest ways to troubleshoot the circuits, might be it may useful for someone

@Jandersonmanhez 8 ай бұрын

Perfect explanation. I have learned so much with you. thanks so much.

@QARepair 10 ай бұрын

Very interesting 👍 and your English are very good

@HaseebElectronics 10 ай бұрын

best regards

@weiaungweiaung Жыл бұрын

စိတ်ဝင်စားဖို့ကောင်ပါတယ် 👍👍👍

@MarkPrince1317 Жыл бұрын

Very good and very informative Thank you very much for sharing Best regards from Philippines 🇵🇭

@HaseebElectronics Жыл бұрын

best regards and special thanks dear brother

@isahizhenfahm6576 Жыл бұрын

Thank you sir for your video lessons on SMPS your video series taught me everything I know about SMPS. Jazhakhum llah khairan.

@HaseebElectronics Жыл бұрын

it is my pleasure

@osamakosara 10 ай бұрын

Masha Allah great video to learn may Allah protect you!

@Dale-ih8uq 6 ай бұрын

I will never leave this channel , thx

@francismannion7075 Жыл бұрын

Thank you sir for an excellent video. Every time I watch your lessons I learn something new.

@HaseebElectronics Жыл бұрын

You are very welcome

@miadaali9628 2 ай бұрын

شكرا-- والف الف شكر لك --- وجازاك الله بالخير---دمت طيبا ومعطاء -بارك الله بك

@muhammadishtiaq24 Жыл бұрын

Excellent Weldon keep sharing

@HaseebElectronics Жыл бұрын

best regards

@abidinakdag658 Жыл бұрын

As-Salamu Alaikum Sir. Really great explanation. I watched every moment of the presentation and listened to it over and over. Thanks to the information which you shared, I believe that I have the knowledge to easily repair and redesign an SMPS. Thank you very much for sharing your valuable knowledge with us. May Allah be with you...

@HaseebElectronics Жыл бұрын

You are most welcome

@will_doherty Жыл бұрын

Very good and very useful in-depth explanation - thank you.

@HaseebElectronics Жыл бұрын

You are welcome!

@gauripartapshanker9197 Жыл бұрын

Thank u so much. Your all vedeos are informative and knowledgeable. Thank you so much.

@HaseebElectronics Жыл бұрын

You are most welcome

@kalross73 Ай бұрын

Love your videos! Thank you so much for sharing the knowledge.

@HaseebElectronics Ай бұрын

You are so welcome!

@LousyPainter Жыл бұрын

That was a very good video for quick troubleshooting ideas.

@HaseebElectronics Жыл бұрын

it is my pleasure

@temyraverdana6421 Жыл бұрын

A wonderful Video, excellent explanation! Thanks a lot

@HaseebElectronics Жыл бұрын

it is my pleasure

@nandakumar621 Жыл бұрын

you are a great master😊🙏🙏🌹👍i am proud. of u

@HaseebElectronics Жыл бұрын

Many many thanks

@AnandAnand-gr2tp Жыл бұрын

Your explanation is good i improve myself in your guidelines thanks

@HaseebElectronics Жыл бұрын

it is my pleasure

@heinsoe8013 Жыл бұрын

Very good video.Thank u Mr Hasssan

@HaseebElectronics Жыл бұрын

You are most welcome

@vijayakumarkumar9190 Жыл бұрын

Very good and very nice explained thanks for sharing this knowledge to us

@HaseebElectronics Жыл бұрын

it is my pleasure

@AbuLeena Жыл бұрын

Wonderful channel , very informative , Well Done Bro.

@HaseebElectronics Жыл бұрын

most welcome dear

@aanish2.094 Жыл бұрын

Hmaisha ki trha shandaar

@HaseebElectronics Жыл бұрын

best regards and special thanks

@eduardocastroisaac1630 5 ай бұрын

Excelente dominio del tema

@HarlavanisPanagiotis Жыл бұрын

Excellent video dear friend, have a happy Thursday ☺️

@HaseebElectronics Жыл бұрын

many many thanks have a happy weekend

@Aualas Жыл бұрын

Thank you so much to share your knowledge.

@HaseebElectronics Жыл бұрын

it is my pleasure

@msbbadsha1456 Жыл бұрын

Very nice & informative video

@HaseebElectronics Жыл бұрын

best regards and special thanks

@dilipthampi7853 Жыл бұрын

Thank you very much sir. Appreciate.

@HaseebElectronics Жыл бұрын

it is my pleasure

@b4ky Жыл бұрын

Can you briefly explain the differences between those ICs that are in the thumbnail (3844,3845..) and UC3846? Thank you, I really appreciate your informative videos. Cheers from Croatia.

@rabihnasr7228 Жыл бұрын

Woooow more then wonderful thank you

@HaseebElectronics Жыл бұрын

IT IS MY PLEASURE

@loganayagan Жыл бұрын

Good job.really clear explanation.can you pls make a video on troubleshooting 3s bms circuit.

@kaizen1071 Жыл бұрын

Emeğine sağlık kardeşim.Hayırlı günler dilerim.

@HaseebElectronics Жыл бұрын

best regards and special thanks

@math-electric2049 Жыл бұрын

terima kasih banyak, saya banyak belajar dari anda, assalamu alaikum

@HaseebElectronics Жыл бұрын

it is my pleasure

@chanthyiet6728 Жыл бұрын

Good job

@silvake Жыл бұрын

One quick observation, which you should probably advise in this video: ALWAYS use an isolation transformer when you're using an oscilloscope for troubleshooting the PRIMARY of any SMPS!!! In fact, I guess you are already using one (not shown in this video), or maybe your oscilloscope is not "grounded", otherwise we should have seen some big sparks when you are connecting the GND of the oscilloscope to the negative HV on the PSU primary. 😲

@kaveag 11 ай бұрын

All correct, I had exactly the same question... He has to have some galvanic isolation, otherwise, it's a guaranteed short.

@Versatiledani Жыл бұрын

Good informative video

@HaseebElectronics Жыл бұрын

best regards

@FishingNOutdoorFun Жыл бұрын

wow very well explained

@HaseebElectronics Жыл бұрын

best regards and special thanks

@Edmorbus Жыл бұрын

Keep up the good work

@HaseebElectronics Жыл бұрын

best regards

@jalal76 Жыл бұрын

Great job

@HaseebElectronics Жыл бұрын

best regards and special thanks

@electronicrepairservice2020 Жыл бұрын

Big fan of all your PS vids and O scope vids. What would cause a PS to have 168v stable on main cap (should be 320ish) and no voltages on the full bridge rectifier? 🤔NTC is good. What did I miss? Board is for a ccfl TV.

@mansirrabiu7412 Жыл бұрын

Thank You very much Sir 🙏

@HaseebElectronics Жыл бұрын

best regards

@allmobilesolution6613 Жыл бұрын

love you sir nice video

@HaseebElectronics Жыл бұрын

best regards and special thanks

@selimkoc4783 5 ай бұрын

Teşekkürler...

@prasadpalo9344 Жыл бұрын

Good evening guruji i love you sar

@HaseebElectronics Жыл бұрын

thanks a lot bhai

@hendriagustian7082 Жыл бұрын

Thank's for the block spike voltage circuit diagram.

@chotuusian4127 Жыл бұрын

Good work

@HaseebElectronics Жыл бұрын

Thank you so much 😀

@rapidcarwash4611 7 ай бұрын

Most excellant tutorial !

@user-nh7rg4sf2o Жыл бұрын

السلام عليكم ورحمة الله وبركاته واضح جدا بان حضرتك تمتلك خبرة عالية في الالكترونيات وانا اضع اعجابي بهذا الفديو المفيد جدا حدثت لي حالة لشاحن لابتوب ASUS وهي بمجرد ان اربط الشاحن على اللابتوب يشحن اللابتوب ل3 ثوان ثم تتوقف عملية الشحن استبدلت الشاحن باخر مستعمل غمل الشحن وعمل اللابتوب جيدا اكون شاكرا للمساعدة دمت بخير

@mirceacraciun4091 4 ай бұрын

Nice and very clear and educative video ! Not need to use a isolating transformer for use the oscilloscope to diagnose a SMPS?

@AbdulMomenZargar60 Жыл бұрын

Walikum Salaam Jee Have Aa Blessed Day

@HaseebElectronics Жыл бұрын

best regards and special thanks

@talhabhaiunique3652 Жыл бұрын

Excellent

@HaseebElectronics Жыл бұрын

Thank you so much 😀

@hadjnabil4811 Жыл бұрын

Thank you Sir😘

@HaseebElectronics Жыл бұрын

Most welcome

@MANINDERSINGH-bw4ms Жыл бұрын

Excellent video sir please make video on led tv driver voltage and current control by changing resistance and make compatible to our need.secondly which multimeter is suitable for 75 to 100 mhz measuring frequency. Thanks

@gururajmmutalikdesai4886 Жыл бұрын

Nice video sir

@HaseebElectronics Жыл бұрын

best regards

@computer4136 Жыл бұрын

Thank you sir

@HaseebElectronics Жыл бұрын

it is my pleasure

@turkialshehri5391 Жыл бұрын

Amazing

@HaseebElectronics Жыл бұрын

best regards and special thanks

@MadinaElectricals Жыл бұрын

Salaam bhai

@mohitarora149 Жыл бұрын

Thanks for a great understanding for working of pwm ic can you plz make a video for pwm ic with getting vcc voltage fluctuating and not able to turn on the driver mosfet..... thanks in advance

@user-mz6ur9re5j Ай бұрын

More than wonderful explanation. I have a question, sir, regarding the blue ceramic capacitor that is next to the connected transformer, such as a photocoupler connection between the input and output area. What is its function? Please reply.👍👍👍🌹🌹🌹

@HaseebElectronics Ай бұрын

it is class Y capacitor, it removes all common mode noises caused by the switching in the transformer, rectification noises in secondary side, and all noises biue to load, it will pass that noises into primary side ground

@CHUZA.FF257 8 ай бұрын

Sir Aoa.great learning video.I requested before for fault asolation of ac DC cieling fan circuit.plz emphasize

@acocrw5808 5 ай бұрын

perfect :)

@HaseebElectronics 5 ай бұрын

best regards

@memorywarrior8752 Жыл бұрын

I know that I post this on all your videos, but you are a legend. Just wondering have you ever read the Switch Mode Power Supply Repair book that was released by Jestine Yong. Or what are your opinions on it?

@ihsanwazir4611 Жыл бұрын

Thanks a lot sir for another informative video I am Ihsanwazir from north waziristan .I have requested u to make a video on account dc fan circuit but u did not made. now I am requesting to make a video on how to remove battery full command from ghotky battery charger plz make a video or reply about.Thanks

@ihsanwazir4611 Жыл бұрын

sir we do not have internet connection all the time but when we visit the city we got online from PTCL network so plz plz and plz reply.

@nayanjagirdar8408 Жыл бұрын

👌👌👌👍

@HaseebElectronics Жыл бұрын

best regards

@michaeltina3866 Жыл бұрын

Good morning sir please please do you have any vidéo on carbon fiber heater. Especially the one with temperature control circuit. Thank you so much for your work

@omeralid9271 Жыл бұрын

thank you in kurdistan

@HaseebElectronics Жыл бұрын

Best regards 💝

@yniwazai9877 Жыл бұрын

I have another safetytip for you. Many SMPS chips like the one you have in this video, can work at much lower voltages than the 220V/110V line voltage. Often - but not always unfortunately - 35V is already enough. You can find the necessary minimum input voltage in the datasheet for your chip. So buy yoursef a basic AC/AC transformer that can output 25V AC (or more) or an AC/DC adapter that can produce 35V DC (or more). Use that output as input for the SMPS under test. It can save you a lot of premature gray hairs.

@sanbhalara6312 Жыл бұрын

Good morning sir

@HaseebElectronics Жыл бұрын

good morning dear brother 💕

@user-cg7id5rw6s 9 ай бұрын

Wow

@akpowerinverter6880 7 ай бұрын

PWM815YBN equivalent ic kaun sa lagega yah ic welding machine ke power supply mein istemal kiya

@erkanmaller9695 Жыл бұрын

👍

@HaseebElectronics Жыл бұрын

best regards and special thanks

@sunilkarki5738 Жыл бұрын

As-salamu alaykum dear haseeb sir can you make some video series about EV chargers for 2 wheeler and 4 wheeler if possible. InshAllah.

@mobilered2776 Жыл бұрын

Hi sir, thanks for the video .since last time I was asking U to , how to find PWM ic part numbers, it is in SMD sot23-6L pakage. I did Google also using the print letters on components but still not get and perfect datasheet ... Nandri Vanakkam 🙏

@HaseebElectronics Жыл бұрын

welcome dear. you didn't mentioned the SMD code. if you can share it, i can also try

@nazakathussain4871 Жыл бұрын

More information for expert person

@HaseebElectronics Жыл бұрын

best regards

@bhavupatel2090 Жыл бұрын

Thank you sir for this informative video.. sir i am new in repair. I am working on atx smps(Lps450) with Utc7608d (str-a6151) and Hs8108 ic. Not getting standby vtg. 330v available at stb xmer primary coil1, on drain and source of utc7608. No vtg on secondary side. Checked all components on standby rail. Help me sir

@hichamtassi1753 Жыл бұрын

Hello, to share my experience with an 12v/220v inverter, the cold testing is good, when power is applied, it is short circuit. Drive signal at sg3525 is good, any idea where to look at ? thanks

@tekniksyantv Жыл бұрын

Is that ptc ? When u apply heat it increase resistance..

@rajeshmukherjee4166 Жыл бұрын

Hallo sir,if possible please explain in eny video how -voltage generates like as -5 or -12 volt DC which is used in optical transmitter of catv

@MajidKhan-br7uj Жыл бұрын

Sir plz chopper transformer k bary main video bnao k wo kesy kam krta hy jo china tv main 17inch screen k sath lgta hy... Horizontal yoke ka load km krny . Is k alava hm kesy yoke load km kr sakty hain

@tvbox8478 Жыл бұрын

👍 ✋

@HaseebElectronics Жыл бұрын

best regards and special thanks

@electronicrepairservice2020 Жыл бұрын

Any chance you could do a video on a dual output power supply for both 12v & 24v, how they work? Currently troubleshooting one that has 24v but missing 12v, only has 1.2v, can't figure it out. Checked caps & regulator.

@HaseebElectronics Жыл бұрын

it seems that the 12 volt section have short circuit check its rectifier and capacitors i hope you will detect the issue

@electronicrepairservice2020 Жыл бұрын

@@HaseebElectronics thank you. The first thing I did was to look at board under a thermal cam - no shorts detected. Then checked all 3 pin components & electro cap values. I came up empty. 😧 No schematics, this is turning into a rabbit hole.... but I will persevere. 🤯 I have a good board to compare it to luckily.

@Dc_tech386 7 ай бұрын

Hello sir I have a question what pwm ic can I use to design buck converter that the current can be adjusted without turning the voltage down,I can’t find a ic that I can latch comparator to control the current output

@mohammad45h Жыл бұрын

👌👌👌🙏🙏🙏❤❤❤🌷🌷🙏

@HaseebElectronics Жыл бұрын

best regards

@ladbla1752 Жыл бұрын

Thanks for your great tutorial. But is it possible t o use a thermal camera to find short in SMPS too? Both in Hot and Cold part of SMPS? Thank you for your reply

@HaseebElectronics Жыл бұрын

best regards yes thermal camera is also a very useful tool but it is expensive. but it is a great tool ad well

@ladbla1752 Жыл бұрын

@@HaseebElectronics Thank you for your reply. What is an advantage( if any ) of light bulb you use in repairs? I use an isolation transformer and not sure if it is still needed/good for me (to start using the light bulb too) during repairs

@HaseebElectronics Жыл бұрын

the series lamp is much better, when we are repairing some circuit card. it covers most of the time the mistakes while repairing. some component failure in the repair process. it will not allow to make more damages in the circuit. using isolation transformer, it is an excellent practice and it is much safe but use of series lamp saves the circuit from more destruction

@ladbla1752 Жыл бұрын

@@HaseebElectronics Thank you for reply. And is it possible to use bulb lamp (to cover most mistakes as you explaned ) and an isolation transformer ( for safety) together ?

@HaseebElectronics Жыл бұрын

please check video number 683 for more detailed answer

@mujtabanaqvitv7619 Жыл бұрын

What could be young👍👍👍

@TheJavaSync Жыл бұрын

Sir, I repaired some smps (laptop charger) when first time it start - it reach 26v then slowly decrease until 19,5v (it need @30 - 50 seconds) & then it in stable voltage, how can I solve this issue? I found this kind issue 2x in my experiences.

@jalal76 Жыл бұрын

Hi Haseeb I need your help to find two smd diodes datasheet. The first one 23m03 The other is 6bg04am. The two diodes were shorted in pcb of hard disk 4 tera.

@juanjody Жыл бұрын

Thank you. Please enable subtitle.

@HaseebElectronics Жыл бұрын

best regards subtitles will available tomorrow morning

@SuperHEROdes 3 ай бұрын

Great tutorial, already like comment subscribe. I'm from Indonesia, I have a problem with the SMPS on the "ANJING" brand battery charger made in China using IC UC3842B on leg 7 (imput) with a voltage of 12 - 14 VDC, on leg 6 (output) there is a pulsating voltage of 0,5 - 1.5 VDC which goes to the MOSFET gate 7N65, on the drain leg the voltage is 210 vdc connected to the transformer leg, primary Elko voltage 320vdc, output 0 vdc, where do you think the problem is sir? I removed and checked several important components in the primary and secondary which had normal values... In this conditions, is the UC3842B still normal or is there a problem? Thank You