Usually the series lamp stays on if short circuit and goes off if not. in this case, the lamp stays on (flashes) because the power supply wasn't taking power till needed?
when the PFC circuit tries to boost the voltage, in that specific time, if the input voltage are dropped, then the PFC controller stops boosting and waits until the voltage reach again at required volatge value. when using the series lamp. the lamps drops more volatge in that PFC startup time. thus the line voltage are dropped at input terminals of power supplies and PFC goes in reboot mode. which causes the flashing scene on the series lamp
Sir ji please show some of the weird faults for example a zener diodes apparently good on multimeter but in circuit it is failing after some time. I am talking about a zener diode in path of feedback to the Offline switching ic. If we solder both ends of this diode it will work upto next morning then again it stops working no output and if we solder again then it is working fine upto next morning. Please make a video about these problems. ❤
Very good investigation as usually. At 09:50 exactly near the bulging electrolytic capacitor, there is a diode which looks externally broken. I'm not sure if D810 is the pcb marking, I cannot see it clearly.
I have a powersupply using 3842 ic. In this supply I have problem og flucting output. If I place black prob on positive and red prob on positive it show stable -24v. But when I put black prob on negative and red on positive it show 8 to 35 v flucting voltage. At VCC capacitor flucting voltage, aut input optocoupler 0 to 0.9 flucting, at main capacitor around 250v in place of 315-320. I changed main capacitor, VCC capacitor,3842 but no benefit. Also check all diode, auxiliary supply. What may be the problem ? No short found in output.
The axial diode mounted just beside the bulged electrolytic cap is also physically broken. But maybe is working fine… You can look at the video to see the broken diode.
That is RCD snubber diode. Snubber diode's failure never causes short circuit at input line please check this link ua-cam.com/video/nf7IGVU1KYA/v-deo.html
Sir, I designed a 24V half-bridge SMPS with an IR2153 IC. I'm getting a 24V output, but when I connect a load, the voltage drops to around half of 24V. What is the problem, and how can I fix it?
Good evening Mr Haseeb. I have a question for you regarding the output of a 48vDC led drive for a 1200w light fitting. The drive gives good 48v output but when it’s connected to the light the fitting flashes constantly. The fitting is brand new and works fine with another drive. What could be problem? Maybe I could send you the drive for you to create tutorial video on the problem? Many thanks.
Great video as usual. You probably know this little trick already. When trying to measure a component that keeps moving around , like the diode did. Try and take a piece of tape (masking, duct, etc.) and place the component on it and it will stay still to measure it.
Vă mulțumesc din suflet dle Haseb,ptr materialele didactice pe care le oferiți; cu drag vă urmaresc din România.Dumnezeu să vă dea sănătate, și putere de muncă!
Usually the series lamp stays on if short circuit and goes off if not. in this case, the lamp stays on (flashes) because the power supply wasn't taking power till needed?
when the PFC circuit tries to boost the voltage, in that specific time, if the input voltage are dropped, then the PFC controller stops boosting and waits until the voltage reach again at required volatge value.
when using the series lamp. the lamps drops more volatge in that PFC startup time. thus the line voltage are dropped at input terminals of power supplies
and PFC goes in reboot mode.
which causes the flashing scene on the series lamp
@@HaseebElectronics Ah! Thank you very much!!!
Sir, there is a faulty diode
Next to the faulty capacitor
Check out the video at 9:56
Thanks for your valuable information
Yes, you are right. I showed this capacitor
I replaced that capacitor in next step.
Thanks for another great video
it is my pleasure
Awsome sir. This video is more information compared to other smps repair. 🎉
best regards
it is my pleasure
Sir ji please show some of the weird faults for example a zener diodes apparently good on multimeter but in circuit it is failing after some time.
I am talking about a zener diode in path of feedback to the Offline switching ic.
If we solder both ends of this diode it will work upto next morning then again it stops working no output and if we solder again then it is working fine upto next morning.
Please make a video about these problems.
❤
Very good investigation as usually. At 09:50 exactly near the bulging electrolytic capacitor, there is a diode which looks externally broken. I'm not sure if D810 is the pcb marking, I cannot see it clearly.
Yes it was damaged.
please check this link
ua-cam.com/video/nf7IGVU1KYA/v-deo.html
9:56 check the diode next to it too, it looke cracked
God bless very educative. ..
Sir, beside the damage capacitor there was a damaged diode.
please check this link
ua-cam.com/video/nf7IGVU1KYA/v-deo.html
Remove and check the mosfet or transistor
mosfet & transistors are in DC line. our problem is in input AC line
Thank you Sir
Most welcome
Good job haseeb.thanks .I have a question for bms.İf you make " how do work bms ( batary manengment system )" I will happy.
Thanks for sharing this repairing video
You are welcome
Hi brother namaskaar.
Good practice. Thank you 🙏
best regards and most welcome
Dabest / .electronics technician..vloger .
How much watt for series lamp for test (best practices)?
100 watt tungsten lamp is good for regular use.
For low wattage power supplies 60 watt is more safe
Very helpful, thank you for sharing 👍
most welcome
Thanks sir🙏🙇
I have a powersupply using 3842 ic.
In this supply I have problem og flucting output.
If I place black prob on positive and red prob on positive it show stable -24v. But when I put black prob on negative and red on positive it show 8 to 35 v flucting voltage. At VCC capacitor flucting voltage, aut input optocoupler 0 to 0.9 flucting, at main capacitor around 250v in place of 315-320.
I changed main capacitor, VCC capacitor,3842 but no benefit.
Also check all diode, auxiliary supply.
What may be the problem ?
No short found in output.
Very interesting fault finding Sir 💐 🎉 🎁 🍰
yes, it is interesting and logical,
The axial diode mounted just beside the bulged electrolytic cap is also physically broken. But maybe is working fine…
You can look at the video to see the broken diode.
That is RCD snubber diode. Snubber diode's failure never causes short circuit at input line
please check this link
ua-cam.com/video/nf7IGVU1KYA/v-deo.html
@@HaseebElectronicsyou’re absolutely right, Haseeb
Perfect 👍
Sir, I designed a 24V half-bridge SMPS with an IR2153 IC. I'm getting a 24V output, but when I connect a load, the voltage drops to around half of 24V. What is the problem, and how can I fix it?
nice
Very nice video sir....what can we do if half output is present,i mean 12 v output instead of 24v... please guide us sir ...
Good evening Mr Haseeb. I have a question for you regarding the output of a 48vDC led drive for a 1200w light fitting. The drive gives good 48v output but when it’s connected to the light the fitting flashes constantly. The fitting is brand new and works fine with another drive. What could be problem? Maybe I could send you the drive for you to create tutorial video on the problem? Many thanks.
Grazie 🙏👍
Thanks for your videos! 👍🖖
it is my pleasure
good
most welcome
❤❤
👍
😊
Great video as usual. You probably know this little trick already. When trying to measure a component that keeps moving around , like the diode did. Try and take a piece of tape (masking, duct, etc.) and place the component on it and it will stay still to measure it.
Sir I want to purchase electric desoldring pump plz give me site link or suggestions the same type that you use to desoldring
Excellent thanks for sharing❤❤❤
Asslam o alaikum sir please full video banae Arduino uno ki k kis tarah agay ipm say koi moter yah compressor chala sake apni marzi ki frequency say
Vă mulțumesc din suflet dle Haseb,ptr materialele didactice pe care le oferiți; cu drag vă urmaresc din România.Dumnezeu să vă dea sănătate, și putere de muncă!
How much I enjoy when I see you repair electronic devices. Keep it up, you are an example for those of us who are learning.Thank you very much!!
I think that luisperez
Good job Master Haseeb👍.
best regards
Thanks sir for sharing...
it is my pleasure
Yayın için çok teşekkür ederim. Türkçe altyazı olduğu için mutlu oldum. Allah razı olsun senden.👏👏👍
çok hoş geldiniz. Allah korusun
I am from sri lanka. Very usefull video i liked it. ❤❤
most welcome and special thanks for your valuable presence
And you forget to change this one.
please check this link
ua-cam.com/video/nf7IGVU1KYA/v-deo.html
I thought that diode was broke too :)
Very useful one,,Thank you sir..
Excellent mr haseeb👌👌👍👍
Informative vedeo. Thank you so much. God bless you.
most welcome
O God, bless and grant peace, increase and bless our Master Muhammad and all his family and companions
❤👍
So nice sir ji❤❤
I am from India bahut achcha lagta hai aapka yah bolane ki Andaaz.
most welcome dear brother
aap mera doosra channel dekh saktey hein
Haseeb electronics Urdu www.youtube.com/@haseebelectronicsurdu
us channel per videos urdu language mein upload karta hoon. aap chaho to urdu mein dekh saktey hein
Another good fix. Thanks for sharing
thanks a lot