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.
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 ❤️❤️❤️❤️❤️❤️❤️
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.
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 💐
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.
@@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?.
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
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?
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.
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.
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, 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..
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
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?
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
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
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.
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. 🙏🏻🙏🏻🙏🏻⚘
Sorry sir, I want to ask. when the atx power supply is turned on, the 12v voltage becomes a bit high almost to 13v, and the 5v drops under 5v. I experience it quite often. Problems like this are usually because of what?
when 12 volt is high, that section is OK when 5V & 3.3 V sections are slightly low, that means any one section from these (5 & 3.3) have problem. might be capacitor, rectifier etc. some component is drawing more current.
@@HaseebElectronics when I encountered this problem on a power supply that had a trimpot. I tried turning the trimpot, for the 5v voltage it can go up to 5.1v and the 12v goes down to around 12.3v. so the output voltage is normal, but by turning the trimpot, even though the output voltage is normal, but it can't enter windows. my analysis voltage 5v and 12v are related. what components affect the 5v and 12v output the most? so if 5v is less, 12v is high. if 12v is high, 5v is low.
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.
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..........
Sir ye smps me over voltage ke resion kya honge, or smps behaviour like short circuit series bulb dansing , output voltage acceptable 12 v but this smps over voltage like 16/17 with sounding notice
Hi engineer, I have built dc to dc inverter using ic tl494 is working fine, but my problem is h-brige i need your help i want inverter h-brige using ic tl494 with feedback circuit. Thank you
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
My 12v 3.2A sony power adapter is giving 23.2v , i checked every component but didnot find any issue or may be i dont understand whats going on, Kindly share me your knownledge regarding this what could be the possible issue that cause smps to output more than rated voltage , (There is a fluctuation of only 0,2 to 0.3v ) Dear! Do reply me as soon as possible. Thanx
in your situation. it seems there is feedback failure, check TL431 or any reference circuit or optocoupler, that is not acting in close loop circuit so it is causing to switch the PWM IC to its maximum duty cycle. please check the feedback circuit
Peace be upon you, my dear brother... I have a problem with a 24 volt power supply, but there is no amp... Can you help me solve it? Thank you in advance
Assalamu alikum g haseeb bhai..aik help chahiya g. Aap ki video daikhi ha.is ma to capacitor kharab saamny nazar aa raha ha.mery pass jo power supplies hain wo 2.5 aur 3.6 ya 3.7 volts dy rahi hain..5v power supplies hain.in ma capacitor bilkul theek hain.koi capacitor b nhi phoola hua. Kia aap bata sakty hain k kis cheez ma masla ho sakta ha..
Hi Bro, same SMPS but 12v 15A I'm having and same low voltage issue, but it's very new and not used, Just I was playing short circuit testing and suddenly voltage went down to around 5v. My case capacitors are looking fine in appearance and getting some tick tick low noise if you hear closely in center yellow transform, Is there any other checks need to do ? Please support 🙏
Sir one component I found in smps is short.which is connected to MOSFET gate terminal.Its a 3 pin smd .looks like a transistor but I unable to find the part number.plz help to identify the component.SmD code is A7I
Hello haseeb sir please is power supply ko explain kar dijiye ki ic tl 494 kaise work kar raha hai signal transformer kaise work kar rha hai feedback kaise work kar rha hai current sense kaise ho rha hai ye all in all ye power supply ko diagram mein explain kar dijiye
salam aleykum warahmatulahi wa barakatu sir i have a problem with a 24v 16,7a power supply its dc voltage keeps changing when i connnect any load like a 12v 10a dc motor do you maybe know whats causing the issue? Thank you
I have 24volt 10 amp smps. But it now giving only 5-6 volts. capacitors are ok. But the transformer making some noise, what should i do now.. Please reply
nice Knowledge sir
MashaAllah very nice video 👍
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
Thanks Mr haseeb for uploading this video, I hope God bless you all the best
thanks a lot dear brother
Wonderful explanation. Anyone can learn about SMPS from your lecture
best regards and special thanks brother
A great teacher just straight to the point no complications
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
You're a genius. Now I will watch and like all your videos today
best regards and special thanks dear
Excellent work dear friend, happy weekend!!!
Many thanks dear friend
اشكرك
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?
Very useful video.
Keep making pcb repairing videos
thanks a lot
sure i will share pcb repair videos as well
Bhaijan wakayi ap bahut achhi tarah se batate hain
Meharbani karke bikes ke digital miter ki repairing ke bare me bhi batayen
Salaam Bhai Saab Aap Ka Channel Aacha Jaa Raha He Khoshi Huyi Liked It # 244
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
Thanks, great explanation!
You're welcome!
Very good and uesfull information sir thanks for sharing this knowledge to us
Most welcome
Great sharing my friend. Fully watched. Stay connected..
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
Very good information video big like have a great day 😊
thanks a lot
Lovely information sir keep up your hard work thanks for sharing. Take care 🇬🇧🇬🇧👍👍
good job dear brother
stay blessed
Walekum Salam Sir very Hard work And very Informative video
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
Very Informative video great work brother
Perfect explain . Thank you sir.
You are welcome
Super sir u have solved my old problem I was facing same problem
wow i am happy that my efforts are helpful
thank you sir your the clear and good explanation . your the best sir
best regards and special thanks for your valuable words
SMPS guru. Good job sir
best regards and special thanks
Big like 272
Good morning ji
Very nice technical info sharing
Mashallah !! So helpful
Great 👍 God bless!!
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
Very good job sir ur wonderful thank you sir
best regards
Wa alikum Salaam good sharing stay safe stay bless from uk 🇬🇧 🤝🤝🌹🌹
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 content as always. Thank you.
lk thank you for sharing happy rakshabandhan bhai 🙏
Good evening. Excellent work as always
best regards
Thanks a lot Haseeb bhai.
it is my pleasure
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?
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.
Yes sir, It is great if you dicsuss the design in future.. i am waiting for it..
Tnx sir. God bless you 🙏🏻❤🙌
it is my pleasure
Thank you sir very helpful
Thanks for the video. Greetings from Mexico.
best regards
Superb 👍👍👍👍
Heya, nice and easy repair
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.
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, 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.
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
Super explain thanks sir 🙏
You're most welcome
You sir, are amazing! Thank you!
You're very welcome!
Thanks. Good explanation
best regards
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.
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?
Thanks for your time and awesome work 😀 👏 👍
it is my pleasure
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
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
Good content as always
best regards and special thanks
Wow very nice big lik stay connected 🌹🏵💮🌷🌼🌸
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.
Sir waiting for detailed video of this smps. Working of two transformer and push pull topology. Thanks
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. 🙏🏻🙏🏻🙏🏻⚘
Very helpful vlog👌
Thanks a lot
Great tutorial like ever .....
thanks a lot
Sorry sir, I want to ask. when the atx power supply is turned on, the 12v voltage becomes a bit high almost to 13v, and the 5v drops under 5v. I experience it quite often. Problems like this are usually because of what?
when 12 volt is high, that section is OK
when 5V & 3.3 V sections are slightly low, that means any one section from these (5 & 3.3) have problem. might be capacitor, rectifier etc. some component is drawing more current.
@@HaseebElectronics when I encountered this problem on a power supply that had a trimpot. I tried turning the trimpot, for the 5v voltage it can go up to 5.1v and the 12v goes down to around 12.3v. so the output voltage is normal, but by turning the trimpot, even though the output voltage is normal, but it can't enter windows. my analysis voltage 5v and 12v are related. what components affect the 5v and 12v output the most? so if 5v is less, 12v is high. if 12v is high, 5v is low.
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.
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..........
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
Hello sir jo 13009 mosfet hote hai ye do size me hote hai ek chota ek bada agar bada na ho to chota lag jayega uski jagah
Nice upload
Thank you so much 🙂
Waiting for explaination how it works :)
yes dear. i will explain as soon as possible
*Thank you*
144 like wow supperb
Many many thanks
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 ye smps me over voltage ke resion kya honge, or smps behaviour like short circuit series bulb dansing , output voltage acceptable 12 v but this smps over voltage like 16/17 with sounding notice
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
Good video 👍
Thanks god bless you
Hi engineer, I have built dc to dc inverter using ic tl494 is working fine, but my problem is h-brige i need your help i want inverter h-brige using ic tl494 with feedback circuit. Thank you
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
My 12v 3.2A sony power adapter is giving 23.2v , i checked every component but didnot find any issue or may be i dont understand whats going on,
Kindly share me your knownledge regarding this what could be the possible issue that cause smps to output more than rated voltage ,
(There is a fluctuation of only 0,2 to 0.3v )
Dear! Do reply me as soon as possible.
Thanx
in your situation. it seems there is feedback failure, check TL431 or any reference circuit or optocoupler, that is not acting in close loop circuit
so it is causing to switch the PWM IC to its maximum duty cycle. please check the feedback circuit
Lk 60 👍👍👍😊
thanks a lot
Brilliant fix thanks
best regards dear
Peace be upon you, my dear brother... I have a problem with a 24 volt power supply, but there is no amp... Can you help me solve it? Thank you in advance
What was your soldering gun company sir
that is Weller wr3m rework station
made in Germany
Thanks sir ji...
most welcome
👍👍👍. Great
Assalamu alikum g haseeb bhai..aik help chahiya g. Aap ki video daikhi ha.is ma to capacitor kharab saamny nazar aa raha ha.mery pass jo power supplies hain wo 2.5 aur 3.6 ya 3.7 volts dy rahi hain..5v power supplies hain.in ma capacitor bilkul theek hain.koi capacitor b nhi phoola hua. Kia aap bata sakty hain k kis cheez ma masla ho sakta ha..
Hi Bro, same SMPS but 12v 15A I'm having and same low voltage issue, but it's very new and not used, Just I was playing short circuit testing and suddenly voltage went down to around 5v. My case capacitors are looking fine in appearance and getting some tick tick low noise if you hear closely in center yellow transform, Is there any other checks need to do ? Please support 🙏
Sir one component I found in smps is short.which is connected to MOSFET gate terminal.Its a 3 pin smd .looks like a transistor but I unable to find the part number.plz help to identify the component.SmD code is A7I
Thanks sir....
Most welcome
Hello haseeb sir please is power supply ko explain kar dijiye ki ic tl 494 kaise work kar raha hai signal transformer kaise work kar rha hai feedback kaise work kar rha hai current sense kaise ho rha hai ye all in all ye power supply ko diagram mein explain kar dijiye
salam aleykum warahmatulahi wa barakatu sir i have a problem with a 24v 16,7a power supply its dc voltage keeps changing when i connnect any load like a 12v 10a dc motor do you maybe know whats causing the issue? Thank you
Super video
👍 Grazie
special thanks and best regards
Hi sir..,Good afternoon
best regards dear
Sir pls upload a video of smps making whistle noise. The noise comes from transformer or capacitor
How can i have classes sir ! Thank you
you can follow my videos
I have 24volt 10 amp smps. But it now giving only 5-6 volts. capacitors are ok. But the transformer making some noise, what should i do now..
Please reply