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 ❤️❤️❤️❤️❤️❤️❤️
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 💐
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
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
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 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. 🙏🏻🙏🏻🙏🏻⚘
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..........
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
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.
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?
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.
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?
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
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.
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.
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
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
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
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
SMPS after testing capacitor 450v 390uf" M"having power but automatically donot cicharged how to salve the problum or (difalt capcator have power after testing)
you are exactly right. but sometimes some designs don't have the polarity marking on PCB, so in that condition we need to follow the DC rail and in my experience i saw some PCB's have wrong marking. so it is much better to ensure the positive and negative terminals or we can put some identity sign before removal
Didn't work.. I have same issue. same 12v 10A power supply suddenly was giving 5v. I tired by replacing these two capacitors (220mf 250v) though none of them were buldge. It didn't work.. 😕😕
there are more than one reasons. might be vcc capacitor might be high power switching section have problem .smps controller issue auxiliary voltage section problem might be feedback circuit have some issue for fluctuation problem you can my latest video in that i covered the points to find fluctuations
@@HaseebElectronics thank you for your reply. I checked vcc capacitor. Voltage is 7.8 to 8v. Capacitor is ok. Check all other capacitors. Getting some hizz sound from transformer.. Could not find any problem. Except a small problem which I never thought.. Preset was faulty 😂😂
please check voltage on main dc capacitor. it just stable and (equal to = input ac voltage x 1.414) check diode in RCD snubber circuit (in parallel to the primary winding) check TL431 circuit
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
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
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.
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 💐
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
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
Wonderful explanation. Anyone can learn about SMPS from your lecture
best regards and special thanks brother
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 good and uesfull information sir thanks for sharing this knowledge to us
Most welcome
Bhaijan wakayi ap bahut achhi tarah se batate hain
Meharbani karke bikes ke digital miter ki repairing ke bare me bhi batayen
Very good information video big like have a great day 😊
thanks a lot
thank you sir your the clear and good explanation . your the best sir
best regards and special thanks for your valuable words
Lovely information sir keep up your hard work thanks for sharing. Take care 🇬🇧🇬🇧👍👍
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 💐
Thank you so much 😀
MASHA ALLAH another superb and informative vlog, a big thumbs up from my side, stay safe and blessed
Thank you so much dear brother
Salaam Bhai Saab Aap Ka Channel Aacha Jaa Raha He Khoshi Huyi Liked It # 244
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
SMPS guru. Good job sir
best regards and special thanks
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
Excellent work dear friend, happy weekend!!!
Many thanks dear friend
Super sir u have solved my old problem I was facing same problem
wow i am happy that my efforts are helpful
Wa alikum Salaam good sharing stay safe stay bless from uk 🇬🇧 🤝🤝🌹🌹
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
Thanks a lot Haseeb bhai.
it is my pleasure
good job dear brother
stay blessed
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. 🙏🏻🙏🏻🙏🏻⚘
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..........
Very good job sir ur wonderful thank you sir
best regards
Thanks for the video. Greetings from Mexico.
best regards
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
Yes sir, It is great if you dicsuss the design in future.. i am waiting for it..
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
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?
You sir, are amazing! Thank you!
You're very welcome!
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.
Thanks for your time and awesome work 😀 👏 👍
it is my pleasure
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?
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
Waiting for explaination how it works :)
yes dear. i will explain as soon as possible
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.
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
Nice upload
Thank you so much 🙂
Wow very nice big lik stay connected 🌹🏵💮🌷🌼🌸
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.
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.
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
Great tutorial like ever .....
thanks a lot
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 🙏
Very helpful vlog👌
Thanks a lot
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
144 like wow supperb
Many many thanks
Good video 👍
Thanks god bless you
Thanks sir ji...
most welcome
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
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
Brilliant fix thanks
best regards dear
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
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
Sir pls upload a video of smps making whistle noise. The noise comes from transformer or capacitor
Hi sir..,Good afternoon
best regards dear
Thanks sir....
Most welcome
Good
thanks a lot
Super video
Nice video sir
thanks a lot dear
Thank you
best regards
SMPS after testing capacitor 450v 390uf" M"having power but automatically donot cicharged how to salve the problum or (difalt capcator have power after testing)
Nice video
👍👍👍. Great
Sir, I have a power supply of 48 volts. Please tell me how to make it 12 volts.
please check video number 390
Thanks
best regards
nice
best regards
Good working
best regards and special thanks
sir please upload repair of cctv centralized powersupply no power and fluctuation...
👌👌👌👍
best regards
👍 Grazie
special thanks and best regards
The negative side of the capacitor is marked by the striped part on the PCB. Also just check such a thing before removing the old ones.
you are exactly right. but sometimes some designs don't have the polarity marking on PCB, so in that condition we need to follow the DC rail
and in my experience i saw some PCB's have wrong marking. so it is much better to ensure the positive and negative terminals
or we can put some identity sign before removal
capisiter konsa rang may check karna hai multi MTR ka
capacitor ko capacitor range mein he check karein ge
Didn't work.. I have same issue. same 12v 10A power supply suddenly was giving 5v. I tired by replacing these two capacitors (220mf 250v) though none of them were buldge. It didn't work.. 😕😕
there are more than one reasons.
might be vcc capacitor
might be high power switching section have problem
.smps controller issue
auxiliary voltage section problem
might be feedback circuit have some issue
for fluctuation problem you can my latest video
in that i covered the points to find fluctuations
@@HaseebElectronics thank you for your reply. I checked vcc capacitor. Voltage is 7.8 to 8v. Capacitor is ok. Check all other capacitors. Getting some hizz sound from transformer.. Could not find any problem. Except a small problem which I never thought.. Preset was faulty 😂😂
Nyc
best regards dear
MashaAllah bhut mushkil kam h
good
best regards and special thanks
sir please work for printer smps
oaky dear i will arrange it
Sir I have same problem.
Please help me to solve the issue
Low voltage 6.9 volt out this type same circuit
please check voltage on main dc capacitor. it just stable and (equal to = input ac voltage x 1.414)
check diode in RCD snubber circuit (in parallel to the primary winding)
check TL431 circuit
Dear sir my smps led less glow and voltage drop on load
please check RCD snubber circuit
and check output capacitors
and main dc capacitor
After 22sec later my smps out put off & then auto on how it Repairing
please check electrolyte capacitor have internal leakage.
possible in secondary side
check input PTC or NTC
@@HaseebElectronics sir few smps use 13007s transistor bt market r available 13007 transistor this is same ?
وعلیکم السلام
Jazaak Allah dear
Kitne prize bhai
bhai Jordan mein is ki Price 60JD he jo indian 6500 rupees hotey hein
اشكرك
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
Good
thanks a lot
Perfect explain . Thank you sir.
You are welcome
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
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.
Heya, nice and easy repair
Good content as always. Thank you.
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 useful video.
Keep making pcb repairing videos
thanks a lot
sure i will share pcb repair videos as well
Thanks, great explanation!
You're welcome!
Very Informative video great work brother
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
Walekum Salam Sir very Hard work And very Informative video