{772} How To Repair SMPS Step By Step
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- čas přidán 29. 06. 2024
- 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 - Věda a technologie
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.
best regards and special thanks for your valuable comment
1741G,is it opamp?
@@HaseebElectronics1741G ic, is it op amp
You are the Guru when it comes to SMPS repair. I don’t think anyone comes close to your knowledge on YT
no brother
i am still learning
thanks a lot for your valuable comment
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!
it is my pleasure. i am thankful for your valuable words
please accept my best regards
@@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!
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
@@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!
شكرا-- والف الف شكر لك --- وجازاك الله بالخير---دمت طيبا ومعطاء -بارك الله بك
Haseeb you are the best i have come across in circuitry explanation
Keep up your excellent work
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.
No university teach like this man .thanks
Perfect explanation. I have learned so much with you. thanks so much.
Best video on smps troubleshooting i've ever seen
best regards
Wa aleikum salam varhmathulla...jazzk allaha kairan...good explanation bro
best regards and special thanks
Very interesting 👍 and your English are very good
best regards
Masha Allah great video to learn may Allah protect you!
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.
We are also following yous foot steps. Many many thanks for your motivation information.
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
Very good and very informative
Thank you very much for sharing
Best regards from Philippines 🇵🇭
best regards and special thanks dear brother
Thank you sir for your video lessons on SMPS your video series taught me everything I know about SMPS. Jazhakhum llah khairan.
it is my pleasure
Thank you sir for an excellent video. Every time I watch your lessons I learn something new.
You are very welcome
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.👍👍👍🌹🌹🌹
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
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...
You are most welcome
I will never leave this channel , thx
Thank u so much. Your all vedeos are informative and knowledgeable. Thank you so much.
You are most welcome
Very good and very useful in-depth explanation - thank you.
You are welcome!
စိတ်ဝင်စားဖို့ကောင်ပါတယ်
👍👍👍
A wonderful Video, excellent explanation! Thanks a lot
it is my pleasure
Emeğine sağlık kardeşim.Hayırlı günler dilerim.
best regards and special thanks
That was a very good video for quick troubleshooting ideas.
it is my pleasure
Your explanation is good i improve myself in your guidelines thanks
it is my pleasure
you are a great master😊🙏🙏🌹👍i am proud. of u
Many many thanks
Excellent Weldon keep sharing
best regards
Excellent video dear friend, have a happy Thursday ☺️
many many thanks
have a happy weekend
Very good video.Thank u Mr Hasssan
You are most welcome
Wonderful channel , very informative , Well Done Bro.
most welcome dear
Very good and very nice explained thanks for sharing this knowledge to us
it is my pleasure
Walikum Salaam Jee Have Aa Blessed Day
best regards and special thanks
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. 😲
All correct, I had exactly the same question... He has to have some galvanic isolation, otherwise, it's a guaranteed short.
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.
Good job.really clear explanation.can you pls make a video on troubleshooting 3s bms circuit.
Good evening guruji i love you sar
thanks a lot bhai
terima kasih banyak, saya banyak belajar dari anda, assalamu alaikum
it is my pleasure
Thank you so much to share your knowledge.
it is my pleasure
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
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.
Thank you very much sir. Appreciate.
it is my pleasure
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.
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
Thank's for the block spike voltage circuit diagram.
Excelente dominio del tema
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
Woooow more then wonderful thank you
IT IS MY PLEASURE
Very nice & informative video
best regards and special thanks
Nice and very clear and educative video ! Not need to use a isolating transformer for use the oscilloscope to diagnose a SMPS?
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
Thank You very much Sir 🙏
best regards
Hmaisha ki trha shandaar
best regards and special thanks
Sir Aoa.great learning video.I requested before for fault asolation of ac DC cieling fan circuit.plz emphasize
wow very well explained
best regards and special thanks
love you sir nice video
best regards and special thanks
Good informative video
best regards
Keep up the good work
best regards
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
Good job
thank you in kurdistan
Best regards 💝
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?
Great job
best regards and special thanks
Good work
Thank you so much 😀
Nice video sir
best regards
As-salamu alaykum dear haseeb sir can you make some video series about EV chargers for 2 wheeler and 4 wheeler if possible. InshAllah.
Thank you Sir😘
Most welcome
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.
Teşekkürler...
Most excellant tutorial !
Thank you sir
it is my pleasure
Excellent
Thank you so much 😀
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
Amazing
best regards and special thanks
PWM815YBN equivalent ic kaun sa lagega yah ic welding machine ke power supply mein istemal kiya
More information for expert person
best regards
perfect :)
best regards
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 🙏
welcome dear. you didn't mentioned the SMD code. if you can share it, i can also try
Good morning sir
good morning dear brother 💕
👌👌👌👍
best regards
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
Salaam bhai
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
👍
best regards and special thanks
Wow
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
best regards
yes thermal camera is also a very useful tool but it is expensive. but it is a great tool ad well
@@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
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
@@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 ?
please check video number 683 for more detailed answer
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
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.
it seems that the 12 volt section have short circuit
check its rectifier and capacitors
i hope you will detect the issue
@@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.
Is that ptc ? When u apply heat it increase resistance..
What could be young👍👍👍
Confusing, the resistance of the NTC increases when heat is applied ? This is actually the characteristic of PTC !
In Negative temperature coefficient ntc resistance
When temperature increases the resistance decreases
As it responds in reverse
👍
✋
best regards and special thanks
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
Thank you. Please enable subtitle.
best regards
subtitles will available tomorrow morning
Assalaam alaykum. Can u eplain how does home theatre amplifier work please
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.
Hasib sir please let me know what happens when smps transformer got shorted . I'm very curious about that sir
if transformer short circuited of it is partially shorted, it will damage the mosfet
👌👌👌🙏🙏🙏❤❤❤🌷🌷🙏
best regards
IN NTC THERMISTOR , REISTANCE DECREASES WITH INCREASE IN TEMPERATURE . THERMISTOR USED IS PTC THERMISTOR IN CIRCUIT SHOWN IN UTUBE
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