{521} How to Repair Laptop Charger, No Power Solution
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- čas přidán 21. 07. 2024
- in this video number {521} How to Repair Laptop Charger, No Power Solution, i demonstrated How to Repair Laptop Charger, No Power Solution. #Laptop #Charger #repairing - (DEAD) No Power Solution | How to Repair Switch Mode Power Supply SMPS, this laptop Dell laptop charger using UC3842 current mode smps controller ic, it had no power, when power was connected or plugged in, it was not powering ON.
when i checked the voltage on DC rail on bulk dc capacitor, these were 330VDC but there was no output. then i checked voltage on vcc capacitor there were no voltage. vcc voltage are the most important for function of any ic. so that was the reason that pwm controller ic us3842 was not taking start. (uc3842, uc3843, uc3844, us3845, ka3842,ka3843, ka3844, ka3845 ics have the same pinout in their datasheet). pin number 7 is vcc pin, it must have vcc voltage for 3842 ic, it must have 12 working vcc voltage. these vcc voltage were missing due to the reason that the startup resistor was burnt. it was not providing initial vdd or vcc voltage to the ic. i checked that the original resistor was 180K ohm. for test purpose i connected 310K Ohm. (we can use a higher value resistor, it will cause a slower start)
explained practical How to repair switch mode power supply SMPS very easy. i shared my easiest and perfect troubleshooting techniques practical troubleshooting. smps concept and troubleshooting repairing or understanding repair switching mode power supply basics and working principle. also i discussed smps basics. after watching this video you can capable to:-
how to repair smps
fuse keeps blowing
how to repair switch mode power supply when short circuit at input
if SMPS is dead or no output
if SMPS have fluctuating output or output voltage unregulated
if smps have short circuit in output
how to eliminate short circuit
how to troubleshoot PWM SMPS controller when there is no switching from MOSFET
if SMPS have a whistle sound or excessive noise or excessive heat
how to repair laptop charger
how to repair laptop charger lenovo, how to repair laptop charger at home, how to repair laptop charger in tamil, how to repair laptop charger dell, laptop charger repair, laptop charger, how to repair switch mode power supply, how to repair smps, how to repair laptop adapter, switching mode power supply tutorial, basics of switching mode power supply, laptop charger no power
00:00 Introduction
00:27 UC3842 smps sample circuit
00:43 how to power up a circuit / use series lamp
02:14 how to troubleshoot fault in laptop charger
02:32 how to test switch mode power supply
02:57 how to test voltage on bulk smoothing capacitor
03:09 how to test vcc capacitor
04:04 how to test smps startup circuit - Věda a technologie
Thank you for this great explanation , I have a very similar PSU to the one you repaired that had the same resistor blown , I repaired it before watching your video BUT you gave me great insight for things to look for in faulty PSU units.
You are welcome
yes dear i try my best to explain fault conditions and their discovering process
@@HaseebElectronics sir do a video about how to clean solder bits. to hold more solder on tips. I got some hakko tips after few days it's not sticking solder led.
Very good and clear diagnosis. Obviously you have a great understanding of digital and analog circuits. Even as an electronic engineer I learned from you. Subscribed 👍
best regards and special thanks for your valuable comment
Nice tutorial. You explained everything about the circuit working very clearly.
Kindly while recording give clear view pause at schematic for 2 to 3 seconds so that we can capture the schematic. Thanks
Assalamu alaikum,
Dear Sir,
I am very much thankful for your detailed teaching about the laptop charger repair. Last month I was listened your SMPS repair program. Everything was very informative. Even though I am a commerce graduate, I am interested in these electronic classes.
I repaired very many things at my home, my own things, but the result was failure. I am not responsible to anyone for the loss, except me. After hearing your valuable and detailed classes, I have a confidence to repair very small electronic things. Very much thanks.. Expecting more classes, and will go through your previous posts. subscribed for more.
Mohammed Basheer
Sir i've been come across some of smps recently and was greatly frustrated to find that the control chip or pwm ic was damaged due to heavy short circuit. Please do some videos on how a pwm gets damaged . what are the good design practices to prevent such kind of issues. Because once the pwm gets damaged it becomes very tough to find a new one in the market and we've to leav the whole power supply.
تشکر سپاس وهزاران لایک بسیار عالی تشریح تحلیل تجزیه وتوضیح بخشها علمی وعملی نکته بنکته ..ومرحله به مرحله ...ممنونم جناب مهندس محترم ممنونم👌👌👌👌🙏🙏🙏🙏🙏🌷🌷🌷🌷🌷❤❤❤❤❤😘😘😘
That startup vcc resistor is one of the first things to check in a dormant switching supply. Some resistors don't do well with a high voltage or large pulses across it. No overload, just quietly drift open.
Power supply ke mamle me aaap ka koi jod ni sir ji bahot acha samjhaya aapne aab hum koi power suply aram se repair kar sakte hai
wow
it is really very valuable feedback for my efforts
Dear Siir, thank you for another great video. When we have laptop charger with no stable output, what are the steps to diagnose the problem on primary and/or secondary side?
Asalam o Alaikum,
Sir your content is great for understanding practical electronics here on CZcams. If possible, the I request you to please creat a video series on SMPS based UPS (Like Homage, Inverex etc) that available in every home. The true sense of repairing you present will help everyone to troubleshoot it.
Thanks for your spirit to helping others.
ماشاء اللہ اللہ پاک آپ کو کامیاب کرے اور سلامت رکھے آمین زبردست وڈیو
آپ چاہیں تو میرا اردو چینل
haseeb electronics urdu
دیکھ سکتے ہیں وہاں میں ساری ویڈیوز اردو میں اپلوڈ کیا کرتا ہوں
Sir, where did you connected the series light bulb at the fuse side? Thanks
biiiig like
waooo amazing bro u doing great job
Allah pak apko kamiyab kry ameen
stay connected
aameen
thanks dear hassan
Thank you very informative troubleshooting. I did same procedure checking the Vcc of the chip is 9v but the Vref is only 1.3v is this a faulty chip?
this video is what i have been looking for ever since. thank you so much sir for sharing your knowledge and experience for free. you are a great teacher.
You are most welcome
ma shaa Allah
another superb repair work tutorial
Many many thanks
Sir thank you very much I am Bangladesh se
Good afternoon engineer, thanks for your easy to learn explanation on adapter problems, please help me out with this problem. I was trying to fix a DELL laptop charger with power ratings: input voltage= 240 ac, output voltage =19.5v DC, 90W, i cannot recall the current rating as at this time of writing, the problem was that the capacitor and the bridge rectifier got bad and i replace them, now it is outputting 19.5v but CANNOT charge the laptop battery nor show the charging light bar any more, please help me out so that i can fix it
I loved your video. Good explanation
Lovely video sir!!! Appreciate your efforts and its very educative and a honest video. Just wanted to ask about the bulk capacitor calculation you had explained in ur video. Can you please make a video about how to calculate two parallel bulk capacitors of 150uF 450v in a 250W smps? Thank you sir
شكرا جزيلا اخي الكريم حسيب على ما تقدمه وجعله الله في ميزان حسناتك انشاء الله.
Hi Haseeb, great tutorial, and understandable.
But could you do a video how to check each component (how to test/ what to look for) without applying AC power.
For people who have faults with other components.
Thank you very much . The best video on this topic on youtube
it is my pleasure
hi sir thank you for sharing such an inspirational video tutorial where we get that schematic diagrams which u explaining the theory part pl z share it sir
ماشاء اللہ آپکی محنت
Jazaak Allah khair
sir I have seen many of your videos all are very easy explain thanks
Thanks and welcome
great explanation and follow up from the circuit diagram. you know what you are doing, thanks about the warning because of the 400 volts element
sir your videos are always very informative and your channel is very useful to learn ❤
thanks a lot
Really great troubleshooting demo and explanation....thank you!
best regards and special thanks
Salam Aleikum Ssi Haseeb. Thanks for lesson with interesting check points. Can you explain what kind of information sends the optocoupler toi the ic. Thanks.
wa alaikum salaam dear brother
sure i will try my best to explain it in detail
Informative video. Thank you Sir Jee
Most welcome
MashaAllah G Brother App Bhoot Talented Hu 🌺
Jazaak Allah kahair bhai Ji
Sir, Wa alikomsalam. Very informatic vedio. Iiked to much.
Thanks and welcome
Amazing video dear friend, happy Sunday!
Many thanks dear
Have a Happy weekend
stay blessed
Very nice explanation master... another new knowledge gained today thanks to you. masallah!
My pleasure
best wishes and special thanks
Very good class, Thanks
Good job and useful explanation, thank you عليكم السلام ورحمة الله وبركاته 🖐️❤
Thanks Hasseeb. I got my answer for how you discharged the capacitor using the PTC :)
Qst please: What would cause a resistor to go open mostly?
You're an artist my brother, hats off ❤️❤️❤️❤️
best regards and special thanks
Again I am here to learn how to explain properly. Keep sharing dear brother
thanks a lot dear sister
A. O. A sir kya haal hai allah apko sehat r kamyabi dy gud luck
Ji bhai Allah ka shukr he
Jazaak Allah khair
wow very informative video thanks sir 🙏
thanks brother Haseeb, nice video, please where can i get circuit diagram for any charger of circiut board
Thanks teacher, wonderful lesson
You are welcome!
Thank you, your sharing is very helpful.
جزاك الله خيرا يا غالي جهودك مباركه بإذن الله تعالى
اللہ یسعدک و یسلمک یا اخی الکریم
صباح الخیر
Very good and useful information sir thanks for sharing this knowledge to us
nice job! i can understand now how to repair my macbook power supply. there is a certain hierarchy in electronics. capacitors and resistors have to support the operation of the IC and transistors. so the power supply really looks like a mix and match of many vendors products integrated to look like a single solution by the designer/oem.
best regards
yes you are right
there is a complete of chain of engineering behind a final product
Thank you sooo much for your hard work!!!
You are so welcome!
I have PA-9E Flextronics 240W charger recently (seller said it's from Alienware laptop, bought it secondhand from online). It's written 19.5V on the spec, but only 19.08V when measured with multimeter. Also, when it connected with wattmeter, when idle/not connected to laptop, it's fluctuating between 0-1.9W (btw, this is level 5 efficiency adaptor. AFAIK, it shouldn't be more than 0.5W when idling/not connected to load. Because I had 19.5V 230W Delta charger, and it's 0.2W when idle/not connected to load). Is it something wrong, or is it safe to use in the future?
MashAllah so much informative vide
Thanks for sharing Sir
thanks a lot
best regards
Hi
Haseeb , I have a psb from Denon receiver ,most of Denon receivers with same board get issue after a while , actually output voltage to HDMI board (5.2 V and Ground) is ok but relay doesn’t clicking to turns on the receiver! I couldn’t find the damaged part, can U help me?I don’t know how can I send u a picture of the board!!!
Hello there,just wanted to know that I have a dell laptop charger with the output of 19.5voltage which is what it’s showing however, when I plug the wire, it’s not charging onto my laptop. I have also bought a new charger and it’s charges but the old charger doesn’t charge up. I have bought 4 chargers as well but it’s also the same voltage for all for of them in the multi-meter. The needle pin of the charger is not damaged either. If there is a video for this, could you please send me the link to find out what the error is please?
Thanks for the video..
In this video, in the sample circuit please explain the snubber circuit.
Usually we use RCD for snubber in parallel to primary winding, but in the sample circuit it is not there
sure i will explain it. in this technique the snubber is used in parallel to the mosfet. i will try my best to explain it as soon as possible
Masha Allah
Nice tutorial
Big like
Many many thanks dear sister
Excellent ,Thanks a lot sir, Keep it up
Most welcome
Really nice work, i liked the idea of measuring voltage on Mosfet which is higher than that across capacitor which indicates that switching is available and also indicated that primary of the transformer is good without shooting inside it, actually i diagnosed a bad secondary transformer (partially shorted) also it can happen in primary, thanks a lot to you , I really increased my experience from your videos, god bless you, barak allah feek, like and subscribe
wow. it is my pleasure
it is really a valuable and encouraging comment
thanks for writing
best regards
Zaberdast sharing dear👌🌹
thanks a lot
thanks for great video..
Greetings from Croatia !!
most welcome
ماشاء الله طريقة الشرح ممتازة وبسيطةواصل
صباح الخير
شكر خاص وأطيب التمنيات لتعليقك القيم.
اللہ یسعدک و یسلمک
Nicely done. Thank you.
best regards and lovely thanks
Hi sir thank you very much for this video.
Have a good day 🙏
best regards and special thanks
Thank you very much sir very useful and nice video
best regards
Subha Bakher Janab Bhai Saab
bahut shukriya bhai ji
Sir,i want 12 volt output from 20 volt
Which resistor do i use?
Assalamu alaikum sir I like to learn something new from your every video. May Allah grant you a good life Amen.
Many many thanks
please accept my best regards
MashahAllah sir. Great video. PlZ urdu may smja dya karay. Thanks🌹
thanks a lot bhai
urdu mein meri sabhi videos mere urdu channel (haseeb electronics urdu) per available hein
czcams.com/channels/LRRH_M_0oW1oLTuUOsDXdw.html
Very gud and smart troubleshooting
Dayum epic video😮
Hi mr dear Hasseb .one queation and please answer
Do you have a HP laptop schematic diagram?
If tou have please just show me for a while in your next video!
i need
it to study that.
Thanks a lot.
Very good informative.
good morning
thanks a lot
Thank you so much. Very much informative.
most welcome and special thanks
Mashallah you are a good teacher.
Many many thanks
Nice explanation.
Nice explanation thank you
You are welcome
Excellent Work Liked It # 284
thanks a lot bhai
Masha Allah zabardast sharing
thanks a lot and best regards
ازخدای مهربان بهترینها را برایتان ارزومندم بسیار باشکوه وعالی لطفا ما در فراگیری هرانچه حرفه ای شدن الکترونیک یاری فرمایید نکته بنکته استاد مهندس بزرگوار ودلسوز...🙏🙏🙏👌👌❤❤
Sir Namaste, Have a Nice Day.... Thanque..
best regards and special thanks
Jazaa kallah khair.
السلام عليكم ورحمة ٱلله وبركاته
جزاك اللهُ خيراً
AA, sir I am very impressed with your work and the way you teach. More over I have some ccps. Can you plz fix it. I can visit you.
best regards and special thanks for your message
i am in Jordan now. so if you are in jordan you can contact me on my whatsapp 00962-79-1161084
@@HaseebElectronics thanks for replying. Sorry I thought you are in pakistan.
@@hafeezm8627 no this time i am in Jordan
شكرا أخي الكريم و بارك الله فيك
most welcome
@@HaseebElectronics Your explanation of SMPS's is very simple, clear understandable and useful. Well done , thank you, brother. From Algeria.
assalamualaikum brother, i wonder what kind of bulb you use for this electrical protection, thank for reply
it is normal tungsten lamp (the old fashion clear incandescent lamp) 220V 60 Watt or 100 Watt
Wonderful job brother
Thank you so much 😀
Sir, Good troubleshooting steps
best regards and lovely thanks
Nice work am your follower continue.but i want to ask you how can i get such a complete digram as your handout.tell me the link the source
Great job!
it is my pleasure
Thanks for the sharing video 🇺🇸👍brother you doing great job 👏
thanks a lot dear sister
Bagus ilmu bermanfaat angkat saya jadi muridmu suhu
thanks a lot
best regards
Hello sir
Please make the video on Siemens make smps, used in the DCS system
Grazie amico. Ottimo come sempre. 👍🙏
best regards and special thanks
ما شاء الله شرح رائع👍
Allah bless you dear brother
Waah zaberdast big like
welcome dear sister
sis your vlog quality is excellent. just you need to add good description, and tags
Emeğine sağlık ustam
جزاك الله خير
best regards and special thanks
Sir I want know whether you have video on how repair fuel station pump control boards
Good Morning
No dear, i never experienced such product
Masha Allah
Very interesting sharing
Please stay connected
best regards and special thanks
Nice lesson
best regards
Hello. Can you please tell me the price of this Multimeter and where to buy it? Also tell me does this give accurate reading?
please check video number 470, that is practical review of this multimeter
czcams.com/video/HoOR26t45Zs/video.html
Shukriya Maestro
best regards
Amazing outstanding OSM Mind Blowing Incredible
Many many thanks