Laptop Motherboards Repairs - The power input circuit

[@essambakhashwein]

Best teacher ever, May God bless you for giving us your precious times

[@ЗлаткоЗлатев-э5к]

Hi Sorin! Don't underestimate the theory. It is very useful to us. To the people who have not studied electrical engineering we are very helpful. Please continue with the theory too. For example, I did not know that at full short the power supply will show 0 volts and at partial short will show 2 - 3 volts. The theory and schemes you draw are very useful to me. Greetings from Bulgaria.

[@jeepee7091]

Златко Златев can’t agree more

[@jonclement]

Just be sure to limit your power supply to 2 amps otherwise you'd melt the partial short

[@karuppanllc9675]

"THIS IS NOT A LESSON,"THIS IS LIFE." : ( OUR LIFE) .THE VIDEO YOU GIVES US TO LIKE " WATER PLUNGED ON A DESERT".EVERY SECOND THIRST FOR KNOWLEDGE ,VAINS RUNNING ON ELECTRONICS. GOD BLESS YOU THE GREAT MAN ( YOUR NAME CHANGED ME AS GREAT MAN) please do basic laptop repairing videos and so me like millions of new commers can learn and understand the things.so that they can change the world into a better place .

[@tinkmarshino]

another outstanding video Sorin! you give us insight to your troubleshooting methods and a good understanding of what we see when we take time to look.. I thank you for all of the time you take for us not only on these you tube videos but on discord also plus the various other platform you are on.. You will live on long after you are gone because all of the kids here will carry your shared knowledge down the years.. and who know who they will pass it to... as spock used to say "live long and prosper" Sorin!

[@Mohamed-jn4yr]

i love how u put up things .. greatings from Tunisia 🇹🇳

[@MouSotto]

No need to explain yourself about your tactics, you've proved yourself again and again!!

[@markpenn4831]

Surely the skill is in diagnosing the fault, rectifying it and understanding what caused the fault in the first place ! Anyone can swap a part like for like. Professionalism is understanding to the minutest detail 'cause and effect.' Absolutely fascinating Sir !!!

[@czjsemnoobcz]

This is probably best channel by far. Best explanation and what's really important is that it is USEFUL and HELPFUL. Thank you for your videos. :) have a nice day :) :)

[@mugurelrosca9774]

Mulțumesc pentru tot ce faci în aceste vloguri. Am învățat multe și te urmăresc cu plăcere. Mă înclin altruismului tău!

[@diemiesepetra]

I really do love this guy, he is teaching life! Everything can be easy when you know how it works 😊 Please keep on going !

[@LVTMVP]

Amazing. I have decided to watch your very first video till now. I'm glad that i have learnt alot of things, many that an engineering school could not teach. My desktop unfortunately decided to die on me during this period where repair shops aren't open and I cant wait to test what i've learned from you and apply it on my desktop. Cheers Sorin ;)

[@bernardvermeulen8031]

Haha, two hand writing love to see you switching hands Evert time you draw something.

[@wisher21uk]

Bernard Vermeulen not many people are ambidextrous

[@bernardvermeulen8031]

@@wisher21uk that is a fact, Leonardo Da Vinci was one of them, Mayby Sorin is related🎨

[@BAMB00STE]

Probably would never have understood these things, if it wasn't for your great videos. Thanks very many

[@ohmware2020]

nice video sir.. i learnt a lot today... were still waiting for desktop motherboard repair... the step by step just like u did on laptop mobo... more power! greeting you great day from philippines!

[@Kreska0]

Hi Sorin, I'm going through rough time and I had to stop my patreon support. I just want to thank you again for all the knowledge you shared and once I will be back on my feet I renew the patreon pledge.

[@ricardoacostatorres1350]

Initial my school laptop costed 700€: i7, 16GB Ram, 940 graphic card 2GB, 500GB HDD 128GB SSD. The hinge broke down and my screen acted funny. I started to diagnose and figured out putting pressure on my screen/ screen chip at the bottom made it go away. but came back after a while. So I first repaired the hinge with 3 small bolts. And then changed the screen for 100€. I also changed my HDD with 500GB SSD Samsung EVO. Glad to do it because a new computer would cost me 1000€+ for a decent one. In total I wasted 200€ so 700+200 = 900€. Build up experience and also always had my laptop available for school. Mostly this is because of people like you sir. Made me realize nothing to be afraid of and just analyse and repair carefully.

[@jay22alco]

Best electronics and life teacher. Thanks for teaching me allot of things sir! To those who really want to learn repair, learn electronics first, then learn to repair and improve through experience.

[@knightwar3]

Terrific diagnostic you made it look so simple with the drawing

[@carlo2491]

Thank'you for sharing your experience. Learn the technique to find the faults is really very difficult. Your lessons are the most interesting TV series of the moment.

[@jonaspersson1975]

Thank u for good videos Sorin! They help me to learn alot!! Its nice of you to give us all help to learn. 👍

[@giorgostexnikos6976]

thenks for the theory professor.amazing video.

[@MF-jo6jt]

A little bit off electronics a little bit of experience and a LOT OFF DODGY 🤣🤣🤣

[@dimitarnikolov3527]

If it's not dodgy the job is not done properly 😂

[@dimitarnikolov3527]

@Skill Hunter dodgy is to use a piece of shoe rubber to press against an ic

[@Mustafay3sil]

M F hahahaha 👍🏻👍🏻

[@kenken5599]

thank you so much Mr.sorin for the great lessons

[@ravindraadapa2952]

sir i very impressed about your skills and knowledge experience what ever really its awesome to learn from you sir till know i watched your all videos each one has different and unique and i had good learning improvement the way to handle and diagnose the faults unfortunately i in India if there i will carry my journey with you sir any way thanking you very much for good skills like this

[@MindYourBusiness1970]

When you get confident you make mistakes ,it's not a fault ,it's normale everybody should learn this mechanism,I fly over when I see this kind of mistakes

[@kgiorgosGR]

I make a playlist because of this video....Best of...videos.you are grand ....you are titan... you are godlike level .respect.one more time.... thank you Sorin

[@VincentTubed]

Thank you very much for your detailed explanation, it's very much appreciated!

[@nkhjk3457]

referring to the things you pointed out at the start of the video, i used to fix computers from a very young age , not really know what i was doing theoretically , but i knew that if i did "thins thing" on "the other thing" things would work again (i read and watched many sources online and videos like yours XD) , but my customers and ALL customers in my country ... think that are always right , demand of warranty like 100+ years , and sometimes they even tell you how to fix the things when they have no idea about them, i remember that once i literally explained to someone for half an hour about his iPod that had a cracked screen and how i could not find an original screen for it because the model was way to old for the local part suppliers to have Original parts in stock and the customer just said to me "well since you cant find original parts for it then you are not a good repair guy!" .. and what do you expect from a guy fixing things at home .... of course they went to the trusted apple reseller and they got a straight big NO , and when returned they got a big NO from me also ... then shortly after i quit self learning electronics and changed my career plans , now it looks like i am starting to like it again thanks to this channel , maybe i will start self teaching again soon as a hobby , and i hope that the people changed and can understand better now :)

[@robertisaacs5122]

Thanks for the picture of the circuit. I wish you would have talked about how the coil works within a power rail.

[@J1media_24]

Hi from Tz .Thank u sorin be blessed a million times

[@husseinSingano]

I,m also from Tz

[@J1media_24]

@@husseinSingano singano 👍👍👍

[@zx8401ztv]

Sorin i always enjoy your repairs, that shop is lucky to have you :-D. Replace the mosfet... ha ha that's a good one :-D

[@electronicsrepairschool]

admit it, that burned mosfet still working as a wire, looks better on the board compared with a boring wire :))

[@zx8401ztv]

@@electronicsrepairschool LOL :-D

[@aggravate83]

Hey Sorin, you can start a patreon goal for the thermal cam! We may save your fingers from burning :) thx for the great content!

[@electronicsrepairschool]

idk, i kinda like it :P The skin burn is the price i have to pay for finding the fault :))

[@aggravate83]

@@electronicsrepairschool job first, burn later...

[@ganesansurya]

You are great Teacher. Mr.S

[@PcParamedics868]

Hey good day man I must say thank you to you.... I learned soo much from videos. Easy to understand.

[@danbeuscher9679]

I got me one of the screw drivers like you are using. It has been very good for the tendon in my thumb.

[@loayabbas2454]

Thousands Thanks Sorin. You are a great teacher 👍🏻😉

[@docfoot316]

Very clever fellow this professor ,well done Sorin ,admire ur knowledge ,Cheers

[@cherifboy6479]

You are always the best.... Thanks fot teaching us for free

[@Oak690]

As always - thank you for sharing your troubleshooting methods!

[@raymie5612]

Thanks for all your vidéos Sorin!

[@kriswillems5661]

Somehow I don't believe you'll replace the blown up mosfet :)

[@wassikt]

I think it got replaced by a proper calibrated fuse 😁

[@nicolawills7571]

Great video lessons and a HUGE THANK YOU i am only learning .

[@sprinter768]

Good lesson, Mr. Sorin. Thanks.

[@electronic7979]

Nice repair video 👍

[@alcapony2012]

more videos like that with detales. nice, thank you

[@markverklas6603]

Thanks for sharing amazing skill Keeping the process of repair simple and straight forward Knowing what can’t work and Finding what will Really appreciate you giving your time to teach Maybe you could tell me if that electric screwdriver is worth getting Or not?? If it is , would you post the brand Regards Mark

[@blackdotkiller1]

Mr give me one second another helpful video thank you

[@pedrobernedo1811]

33:50 I thought the same, you should buy a thermal camera. Good video!

[@mmbbsqw1d]

Nah, he could maybe pour some alcohol on and see it evaporate (it will evaporate quicker on hotter components)

[@mohammadzare9927]

hey sorin, i love you, 😉 i love your english accent and words you choose 😂 and you are very professional man.

[@LatvianMinecrafter]

Did you ever replace the mosfet or add a new capacitor? If not, is it safe for the other components to not put new ones on or not?

[@MrRvdbeek]

Nice job nice explanation It works with blowup parts thank you

[@MRDEEPAKVASWANI]

My highest respects goes to you,I love you my teacher,your videos are inspiring ,and have teach me a lot.I have a question this smd capacitor have no value written on it how do you know what value capacitor to use.Thank you beforehand.

[@malikkhan_01]

man your the best keep on teaching us and may Allah bless you

[@sayedtadoun2169]

more videos like that with detales nice you are a good manthank you ( from Tunisia )

[@hadireg]

so nice sharing!!! thanks Sorin!!

[@azetech2232]

thank you very much all yr lesson is helpful . fan from morocco

[@lvwilb5687]

HI SORIN GREAT JOB.WHY DONT YOU USE THE NEW PORTABLE POWER SUPPLY THAT YOU HAVE TO DO DEMOS WITH,I HAVE ONE LIKE THAT, AND ON YOUR NEXT VIDEO WILL YOU USE IT, I GET CONFUSED ON THE AMP SETTING WHEN YOU INJECT AMPAGE INTO THE MOTHERBOARD,

[@poziomy5273]

I like this channel very much. But i have VERY important (to me at least) question. Why there is no desktop board repairs?? Its not about your channel, but others as well. Are desktop boards not impossible to repair? Too difficult? Too expensive? Why no one seem to repair desktop boards???? Can you explain please?

[@abuubakarosmanaweys9106]

Thanks for the lesson

[@muhammadsameer883]

excellent brother. keep up the good work

[@sh0352]

What an exciting channel...

[@rizwanshaa]

wonderful teacher. i love you sir.

[@arnoant1438]

I study electronics in high school but I don't learn much, hehehehe. If I had internet before... now is much easier to learn.

[@f1lab535]

Did the chipset for cristian's laptop arrived yet?

[@electronicsrepairschool]

adel saidi not yet

[@Shanus00747]

I am also waiting for this, Mr.Sorin

[@paolomonai9511]

I, too....very curious to see how a chipset can be replaced without the proper special soldering tools.

[@DanielsGameVault]

You should go a little more in depth about those input FETs and how they actually operate, instead of simply treating them like switches. I for one, to my shame, although I fix laptops myself, still cannot wrap my head around how they work and how they "act". There's both P and N channel types in there which also have body diodes in them, further confusing the way they operate. Can't figure out what the gate needs to switch the D-S junction on/off.... A look at an actual schematic for any laptop would be great to illustrate this. Cheers !

[@cosmincararusa8044]

Hello Sorin ! I have an issue with an faulty display on my Lenovo Y50-70 laptop. Long story short: Everything was ok, laptop fell around 20 cm height on a bed: Black screen of death! Everything else works perfect, including camera on display. I have illuminated the screen with a bright light and the image is theren but very very dim. What could be? Is it posiible to be a cable problem, or something more complex? Multumesc frumos! Very nice channel an very nice information here!

[@massimilianobarresi.]

Sorry Sorin i've asked in the last video how do you recognize N-Channel or P-Channel.. but on minute 11:27 you explain it.. "based on the configuration on 1 side we have 4 pins togheter and in the other side we have 3 togheter and 1 gate.." ok and in this case we have N-Channel mosfet? If i don't have the schematics i don't recognize it.. but you in very simple method recognize it! I do not know how :D

[@K1ZEK]

Very interesting and very good talk/video.

[@uchesoncomputerconcept2856]

Thanks so much, pls can I get a detail video on good usb port but not working for any laptop

[@auguststas7770]

Will power supply check work on HP. As far as I remember it has to have 2 different voltages: one for identification and one for power ?

[@Fourty_7]

Hi Sorin happy to see you again , i have a question about the graphic chip : can we do the reballing of the chip manually ? Is it possible ?

[@dalecostich8794]

stupendous teaching!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@Mgcomputermarcianise]

Well always well when Explain you make everything easier 😃 but it is only when I work on my MB I always find it difficult .... bah I'm trying to learn for the moment! ok Mr. Sorin, I have 1 question if there are 7v on the second mosfet and not 19v what was the problem?

[@Electricworld-1]

Thank you very much, a big thumbs up

[@AdamSNook.]

instead of removing the mosfet and putting a wire couldent you use a Diode to stop the volts from going back into the dc soket and down the charger

[@AdamSNook.]

i have a asus laptop that as had the mosfet removed and when i unplug the charger from the mains the charger light stays on lol as its sending current down the dc socket back to the charger

[@Abdallah.795]

God bless u your ownest in everything....... ❤️ A heart from my heart.

[@greenishaq]

Thank u sir. from Sri Lanka....

[@metalacos]

If you get a pound for every time you said "I should buy a thermal camera" you could be a millionaire :D

[@frankfernandez1569]

best teacher ...

[@xkhokokox]

How was he able to measure the amps between power supply pin and ground at 9:30? Can you do this with a voltmeter too somehow?

[@ЗлаткоЗлатев-э5к]

I would also like you to explain to me what a coil (inductor) is. How it works. Whether it increases the voltage or can only reduce it. I'm aware of a tansformer but not of pulse power supplies . Can you bring a little clarity on this to us beginners. Thanks! Sorry for my English (Google Translate) (I watched your videos for beginners. there you explain how two mosfets close and open with 300,000 hertz and from there the coil makes a high voltage, but unfortunately I can't understand it)

[@WeFixTvs]

Louis Rossmann explain it very well,

[@ЗлаткоЗлатев-э5к]

@@WeFixTvs Link please! Thank you

[@samslog]

When the PCB has exploded or is flaking apart. When a 'big' chip is dead. (Bigger than super IO) that's when its risky, some things are a massive uphill battle.

[@geoepi321975]

You should check the charger under load not the surface voltage sir sorin

[@evo8511]

(thyrestor) Thank you for apologizing, I thought I was wrong

[@xkhokokox]

I don't really get his explanation at 13:10 about why it is ok to remove the mosfet and short it. Can someone explain this?

[@danteaguila6772]

how much degree are you using when you are removing the component ?

[@wahyupamungkas5331]

Brother, I want to ask something, what's name screwdriver machine that you use?? Thanks..

[@mmbbsqw1d]

I have no power or led and first two MOSFETs (are scorched) and they are shorted on Gate-Drain. This must be my issue right?

[@gastonb1318]

And with the comment We are not doing electronics We are doing repairs you can finally stop explaining when you do a dodgy job. Wisdom genius. Put that in the channel page so ppl understand clap clap clap clap 👏👏👏👏👏👏👏

[@davevv1]

what screw driver is that you are using and is it worth it?

[@loverboykimi]

You forgot the connect screen connector thats why it was not coming on at first try:).

[@org4ngrinder]

As we like to say "All care and communication, no responsibility." Some customers won't take no for an answer when they hear it's a possibility. If the risks are communicated and the risk is understood and they still want to proceed, who are we to say no?

[@danielbayugar4856]

Thank you Sir!!

[@arrevunella]

22:49 ---> 34:20 damned capacitors xD

[@PaulsScripts]

Have you forgotten Twitch? It has been offline for quite sometime now.

[@daanvanniekerk7146]

Why don’t. You have to use a lower testvoltage on the second mosfet to detect that there is an short? If a switching mosfet from power supply (from for example the cpu) is also blown and permantly giving power than the cpu receives this 19v voltage also. Or am I wrong some where in this case? can anyone explain

[@AnonymousRepair]

Please show us that it chargers with the faulty mosfet, The same ic that controls the first two mosfets, controls the charging of the battery and talks to the battery and EC ( super IO chip)

[@electronicsrepairschool]

i still can't see the connection, i had 19v before the mosfets, 19v after.... have absolutely nothing to do with the charging

[@AnonymousRepair]

@@electronicsrepairschool The same ic is used for both, some of the charging ic will not charge the battery if those mosfets are faulty, kzbin.info/www/bejne/rZPOZ5qKo5eoi8k

[@electronicsrepairschool]

I understand, but my issue is not the charging circuit, my problem was a shorted cap and a shorted mosfet

[@AnonymousRepair]

@@electronicsrepairschool That was my problem too, The first mosfet was briged and would stop charging after while and run down the battery , unplug the charger and replug it would let n charge for n few minutes then stop again that was with the first mosfet shorted, I removed the short over the mosfet and the laptop would not switch on

[@electronicsrepairschool]

thats because your management chip was dead!!!! Not because you short the mosfet, those mosfets are doing nothing else than driving the 19v to the rest of the power supply's.

[@jjeff1955]

I have the Asus ROG G751JY Gaming Laptop and Brand new Battery will Charge to 100% and work good for several hours then all of a sudden Fail and the laptop will not turn on again unless I Purchase another New Battery. This has happened with 5 Batteries so far. When Fully Charged Everest Software lists the battery as Plugged in A/C and Discharging, Is this normal? But the Battery does stay at 100% Full Charge when Plugged in. This New Battery seems to be ok for now, but will it Fail also? this Battery states that it has 4% Wear and seems to be not failing like the other ones did with 0% Wear listed. Is it possible that my Mother Board is Defective?. Or just a bad batch of Batteries? Any Suggestions or Help would be great! Maybe I was just getting poor quality Batteries? I do not want to be destroying new Batteries and getting refunds for them if it is my Laptop that is causing these issues. This Asus laptop is very good at Gaming and is very fast, but it does generate a lot of heat when gaming and that is when the batteries seem to fail after a few hours after gaming at 65c. I have cleaned and re pasted the the CPU and the GPU and that has helped lower the Heat. The Fans are working perfectly to keep it Cool. Forgot to add. I do have a Brand New Genuine Asus 230 Watt A/C Adapter and a new Replaced Power input Jack.

[@mavesoft3284]

Please no thernal camera your expresion has no price.......simple the best!!!!!! ::=)

[@masterpo7594]

Hi, does some components on laptop motherboard should be not soldered properly? I gave my laptop to a repair shop but they said they could not fix it. Then I take a look a it then I see components where it's only soldered on one side. I hope someone can help me.