Very nice! At first you've just bypassed the PFC section and let the SMPS work completely without it right? That way you could identify 24V at the output.
Yes, exactly first i verified, standby section then secondary section at last PFC section in some power supplies, secondary stage is interlocked from PFC, first PFC must turn on and then secondary section will work. in that power supplies, first we need to operate PFC and then secondary will run
Hi Haseeb, greetings from UK! 😊 So glad I found your channel, you have one of the best teaching styles, clear, calm and concise with practical demonstrations and clear circuit diagrams. I have some electronics knowledge but am looking to build on this and your channel will help immensely! Thanks to this video, I finally grasped the intricate circuitry of the PFC PWM controller! Thank you and have a great day! 😊
Sir, knowledge is power 😊 Vidya danam sarva danal pradhanam". There is no death for good knowledge, think and do, you showed with practical mixed with knowledge, you used brains Sir, with out uttering any thing you could repair 😊but for us you explained, thankyou sir 😊
I recently watched your video about feedback , I learned a lot. Can you make a video on how to measure secondary voltage when SMPS have standardby circuit and I will also like to learn how does an SMPS with standardby and main circuit work with eachother.
When you removed the PFC FETs and DIode , did you have to add link on the PCB across PFC output diode holes to connect the bridge output to the large filter capacitor ?
this power supply have 2 rectifiers, d2 (single diode) for coupling supply voltage to the capacitor in parallel there is PFC circuit which have 2 mosfets, and D3 diode. d2 & D3 are connected to same point at capacitor +ve terminal
Very good video . What was the root cause of this fault . Often we see with power supplies one fault that then leads to a number of other related failures . So it very interesting at the end to describe what the root cause of the fault was and how it lead to the other secondary failures . Also I was not able to see the Vcc resistor on the schematic . How is the Vcc supply generated after initial turn on of the PFC circuit ? Many good debug techniques demonstrated !
i think it was failure of the MOSFET, which damaged the gate resistors, fuse because (both mosfets in PFC section are in parallel, one of them get short circuited) which caused to all damages
sometimes it shows resistance but there is no authentication for any resistance value if it gives continuity, then it will short circuit otherwise its functional check will the final serviceability check
@@HaseebElectronics thank you friend, unfortunately it turns out that there is a broken line to the ic, after buying a new one I tried the old ic it was still working, 0.5mm the broken line, seeing the track and signs of burning or checking is indeed an important first step before deciding on a component damaged, blessings are always for learning and always healthy my friend. greetings from Indonesia.
Hi Haseeb, quick question unrelated to they power supply even though it could apply to some of your repairs, how do you remove potting compounds from circuit boards? I have an inverter which is encased in potting compound I tried using heat from a hot air gun which works but it remove the surface mount components at the same time so it no good especially since I dont have a circuit diagram so dont know what components were blown off and from where
no if pfc circuit is out. when the line voltage will drop less than 200v ac rms approximately. this board will turn off. because it's smps controller needs regulated DC voltage at 400 volt
Good video sir, it shows some tests that I learned from you in previous videos and applied when diagnosing a car battery charger of mine which was blowing the fuse. The culprit in that case was 2SK3548 900V, N-Channel Power MOSFET - Fuji, package TO-3P on the primary side of the battery charger. Is the pinout always gate, drain, source from left to right for a similar MOSFET? I have noticed that sometimes a full bridge rectifier is before a transformer and in other cases after the transformer in the circuit. Why is that and what is the difference? The battery charger I have is Anjing AJ-618A, I have been looking for a circuit diagram for months and I can not find it. I have circuit diagrams for the MOSFET and for the IC 3842B, additional code on it is XBLQ but they are quite different from the circuit in the battery charger. I want a circuit diagram for this specific car battery charger for the next time I abuse it and need to repair it. Is someone here that knows where to find it if it exists online?
Thank you Sir for this very informative video. But if the series lamp is fluctuating on and off without the pson command and the voltage on the bulk capacitor is fluctuating drastically. Does this imply theres a problem with the input section?
Hi! Maybe someone can help me with my ILPI-263 SMPS from my HP monitor. It had a blown rectifier diode in the secondary circuit that i replaced. The monitor is now working fine with on a variable transformer from around 120 - 200 V. When reaching 230 V (standard in europe) the diode blows. Do you have an idea what could be the problem? I am totally clueless at the moment. Thanks
awesome video dear haseeb sir, i have a problem, one of smps has tvs diode on pfc section, i replaced mosfet that was short ,the short on gate drain caused gate resistor to shift value i removed that as well but now i dont have tvs diode, i tried it without tvs diode and mosfet shorted once again, can you tell me if we can use RCD instead of tvs on pfc section?
Sir mere pass harman kardon avr1700 5.1 music system hai system on hota hai pr amplifier section pr supply 45+45- ki dual supply on nahi ho Rahi please help
Actually 6.3 ampere is approximately 150% of the actual current. We can say the system peak current with full load will 4 ampere. Without load might be in milliamps (less then 0.25 ampere approximately)
Very nice! At first you've just bypassed the PFC section and let the SMPS work completely without it right? That way you could identify 24V at the output.
Yes, exactly
first i verified, standby section
then secondary section
at last PFC section
in some power supplies, secondary stage is interlocked from PFC, first PFC must turn on and then secondary section will work. in that power supplies, first we need to operate PFC and then secondary will run
For sure, one of the best youtube channel, never fake, always really true.
special thanks for your golden words
it is my pleasure and your words are valuable for me
please accept my best regards
@@HaseebElectronics Your channel's been a blessing for me. Thank you too for your words.
Mashallah sir kamal explained ap se bohot koch seeknay ko mela allah ap ko Zindagi or sehat de
aameen
Jazaak Allah khair
Hi Haseeb, greetings from UK! 😊 So glad I found your channel, you have one of the best teaching styles, clear, calm and concise with practical demonstrations and clear circuit diagrams. I have some electronics knowledge but am looking to build on this and your channel will help immensely! Thanks to this video, I finally grasped the intricate circuitry of the PFC PWM controller!
Thank you and have a great day! 😊
I am from Kerala.I often watch your videos. You are genius and a good teacher. So I subscribed the channel just now.Expect more useful videos.
You are indeed the master of SMPS repair. Excellent job and thanks for sharing your knowledge and tips
please accept my best regards and special thanks
Thanks mr haseeb ,you are professionally technician👌👌👍👍🌹🌹
Thanks and welcome
You're one of best teachers,
👏👏👏Excellent troubleshooting sir, very nicely explained.🙏
Haseeb bhai that was a very educational video thank you sir.
it is my pleasure
Thanks for sharing your technical skill .
Very informative troubleshooting technique! Ty Sir Haseeb!
God bless your household.
You are most welcome
God Bless you and your family
I really appreciated your approach to this troubleshooting. I will watch the other videos you posted.
best regards and special thanks
بارك الله فيك استاذنا الفاضل وجزاك الله خير الجزاء على معلوماتك القيمة وجعله في ميزان حسناتكم
الحمد للہ
اللہ یسلمک و یسعدک یا اخی الکریم
Thank you so much for the very useful tutorial , may Allah bless you , wish you all the best
Many many thanks
New suscriber here! Greetings from México and thank so much for share your knowledge 👍👌👏
most welcome and special thanks for your valuable appreciation
Sir, knowledge is power 😊 Vidya danam sarva danal pradhanam". There is no death for good knowledge, think and do, you showed with practical mixed with knowledge, you used brains Sir, with out uttering any thing you could repair 😊but for us you explained, thankyou sir 😊
Masha Allah.... Very very interesting guidance. I lean a lot. Thanks Brother.
You are most welcome
Real instructor ❤
thanks a lot
I love your troubleshooting of this power supply.
it is my pleasure
Very good explanation, this time I watched video and commented!lol
thanks a lot bhai
Very important. Sir, my congratulations. 👍🙏
Really I learned new about pfc Circuit thank you so much sir
it is my pleasure
Very nice video once again Haseeb! Thank you 🙏🏻
So nice of you
Excellent Weldon helpful video keep sharing
Many many thanks
Beautiful explanation brother
Thank you so much
best regards
Beautiful explain. Thank you sir.
You are most welcome
Very good and useful information sir thanks for sharing this knowledge to us
best regards
Keep up the good work
best regards
thanks for sharing and Great video new gift 👌👌🎄🎁🎁🎁🎄
Great job 👍
best regards and special thanks
Awesome, find it gr8 and very useful.
Keep you on high regards Sir.
Thanks
Interested case study ❤❤
Thanks 🙏
like wow so great skills job best wishes
best regards
Bilgi dolu video olmuş.Allah CC senden razı olur inşallah. Teşekkürler . Sağlık lı günler dilerim.
Another great lesson Sir!
it is my pleasure
Thank you for another excellent video but how did you know that standby voltage should be
5V without mosfets?
I recently watched your video about feedback , I learned a lot. Can you make a video on how to measure secondary voltage when SMPS have standardby circuit and I will also like to learn how does an SMPS with standardby and main circuit work with eachother.
Thank you very much sir 🙏🙏🙏
Most welcome
When you removed the PFC FETs and DIode , did you have to add link on the PCB across PFC output diode holes to connect the bridge output to the large filter capacitor ?
this power supply have 2 rectifiers, d2 (single diode) for coupling supply voltage to the capacitor
in parallel there is PFC circuit which have 2 mosfets, and D3 diode.
d2 & D3 are connected to same point at capacitor +ve terminal
Master .💯😊
best regards
@@HaseebElectronics Dear Master.Give a brief introduction to the pfc and boost converter described in this video
wah! Explained neatly.
thanks dear brother
Great informative video
best regards and special thanks
Super vidéo! Merci!
Very good video . What was the root cause of this fault . Often we see with power supplies one fault that then leads to a number of other related failures . So it very interesting at the end to describe what the root cause of the fault was and how it lead to the other secondary failures . Also I was not able to see the Vcc resistor on the schematic . How is the Vcc supply generated after initial turn on of the PFC circuit ? Many good debug techniques demonstrated !
i think it was failure of the MOSFET, which damaged the gate resistors, fuse
because (both mosfets in PFC section are in parallel, one of them get short circuited) which caused to all damages
Informative vedeo. Thank you so much.
it is my pleasure
Videolarınızda kullandığınız lehim sökme makinesi özel bir tasarım mi ? Bu lehim makinesi hakkında bilgi verirmisiniz ?
WELLER WR3M yeniden işleme istasyonudur. daha fazla ayrıntı için 511 numaralı videoya göz atabilirsiniz
@@HaseebElectronics yanıtınız için teşekkür ederim
Cool videos,thank you
best regards and special thanks
Merci pour le sous-titres
avec plaisir
reste béni
Very nice sir
Thanks and welcome
Thanks sir,👍
best regards
Greate informative vedio
Many many thanks
Dear Sir , In this video which pins are shorted though a push switch.
How you connect the lamp, it s direct to input 220vac from p.s??
Sir ek bar subtitles upper karke ek video banavo plz some time can't see because of subtitles ☺️☺️🙏🙏🙏
bhai subtitles location TH-cam ki tarf se hoti he.
aap apni video screen per click kr k CC button top right corner per he. us se off kr lein
#ask
My friend, will vcc and ground in the ic show resistance when measured with an ohm meter?
sometimes it shows resistance but there is no authentication for any resistance value
if it gives continuity, then it will short circuit
otherwise its functional check will the final serviceability check
@@HaseebElectronics thank you friend, unfortunately it turns out that there is a broken line to the ic, after buying a new one I tried the old ic it was still working, 0.5mm the broken line, seeing the track and signs of burning or checking is indeed an important first step before deciding on a component damaged, blessings are always for learning and always healthy my friend. greetings from Indonesia.
Thank you!
it is my pleasure
ما شاء الله علم وكرم
If we bypass pfc circuit tv will work or not
Tv will work but at low line voltage
It will drop video quality or may damage other things in power supply circuit
Shukriya Maestro
Hi Haseeb, quick question unrelated to they power supply even though it could apply to some of your repairs, how do you remove potting compounds from circuit boards? I have an inverter which is encased in potting compound I tried using heat from a hot air gun which works but it remove the surface mount components at the same time so it no good especially since I dont have a circuit diagram so dont know what components were blown off and from where
Tq mr haseeb
So. Ok to just leave pfc circuit out, right?
no
if pfc circuit is out.
when the line voltage will drop less than 200v ac rms approximately. this board will turn off. because it's smps controller needs regulated DC voltage at 400 volt
I just ripped an almost similar power supply board from a huge monitor.
The output section is exactly the same.
Wonder what tv model use it?
wow that is great
it is normally used in Suuny, National Electric, Axen, Woon and many other LCD TVs and monitors
good job. ve aleyküm selam...
Hai 👌👌👌👍👍👍
best regards and special thanks
assalamualaikum..sir..after power on..if bulb lightup
.it is short circuit?
that means there is short circuit
check bridge rectifier, capacitor
mosfets
PFC section MOSFETS and rectifiers
Good video sir, it shows some tests that I learned from you in previous videos and applied when diagnosing a car battery charger of mine which was blowing the fuse. The culprit in that case was 2SK3548 900V, N-Channel Power MOSFET - Fuji, package TO-3P on the primary side of the battery charger. Is the pinout always gate, drain, source from left to right for a similar MOSFET?
I have noticed that sometimes a full bridge rectifier is before a transformer and in other cases after the transformer in the circuit. Why is that and what is the difference?
The battery charger I have is Anjing AJ-618A, I have been looking for a circuit diagram for months and I can not find it. I have circuit diagrams for the MOSFET and for the IC 3842B, additional code on it is XBLQ but they are quite different from the circuit in the battery charger. I want a circuit diagram for this specific car battery charger for the next time I abuse it and need to repair it. Is someone here that knows where to find it if it exists online?
Meter works good
Thank you Sir for this very informative video. But if the series lamp is fluctuating on and off without the pson command and the voltage on the bulk capacitor is fluctuating drastically. Does this imply theres a problem with the input section?
السلام عليكم مرتضي ادريس من السودانi ask for solar charge tow type circuit expained i see your vidio solar inverter 5 vidio very good 1
758 to 774 तब तक का वीडियो आपने उर्दू chennal मे भी दिजीए कृपया हमको भी हमारे ग्यान मे इजाफा हो और हमको उपयोगी हो आपको गुजारिश है
Walikum Salaam Bhai Jee
shukriya Zargar bhai
Sir teach us on how to replace faulty lED on lED tvs
assalamualaikum..5v stanby jumper tu what pin sir.?
it is to be connected to PSON on pin
@@HaseebElectronics thanks
How did u learn these things and where ❤
it needs electrical or electronics engineering and then practical work in specific field
@@HaseebElectronics what did u study ?
And how much years
Hi! Maybe someone can help me with my ILPI-263 SMPS from my HP monitor. It had a blown rectifier diode in the secondary circuit that i replaced. The monitor is now working fine with on a variable transformer from around 120 - 200 V. When reaching 230 V (standard in europe) the diode blows. Do you have an idea what could be the problem? I am totally clueless at the moment. Thanks
awesome video dear haseeb sir, i have a problem, one of smps has tvs diode on pfc section, i replaced mosfet that was short ,the short on gate drain caused gate resistor to shift value i removed that as well but now i dont have tvs diode, i tried it without tvs diode and mosfet shorted once again, can you tell me if we can use RCD instead of tvs on pfc section?
RCD snubber will not work in that stage. because that TVS have a specific clamping voltage, so you will need same value TVS
Sir you should make a series board not loose series board.
12v line is giving 24v what causes that?
Welldon
thanks a lot bhai
👌👌👌👍
best regards and special thanks
وعليكم السلام ورحمة الله
Sir mere pass harman kardon avr1700 5.1 music system hai system on hota hai pr amplifier section pr supply 45+45- ki dual supply on nahi ho Rahi please help
👍👋👋
thanks a lot dear friend
❤
S.A. original fuse is 6.3 A but 3 pcs of wire = 3 A is used? Why?
good point
this jumper fuse for troubleshooting only.
for permanent solution, it must be replaced only with original rating fuse
@@HaseebElectronics thanks for response yes that is permanently. but I had asked the current value since 3 A (3 pcs of wire) is lower than 6.3 A
Actually 6.3 ampere is approximately 150% of the actual current. We can say the system peak current with full load will 4 ampere.
Without load might be in milliamps (less then 0.25 ampere approximately)
@@HaseebElectronics you are good trainer Mr Eşref.(your name in Turkish)
Ok🌷🌹🌷
best regards
🧿
👋🙏👍
best regards and special thanks
Power supply of LCD tv diegrame.need.
Great job 👏