Good evening. I'm mozambican from Nampula province. I wish to congratulate you from your patiente in teaching me and other more. Since I knew you from KZread I just said: god bless this man and forever. Remember that you have a great student beside.

You are the best teacher in the world!!! Thank you very much!!! thanks to you I was able to fix a board that was shorted due to having dropped liquid in it.

pretty amazing repair. Absolutely did not expect the ram to be running with that short !

Yes ! we are having fun. lol Great video many thanks , enjoy this stuff. Tomorrow I will be 72 and at it for over 60 yrs.

@onursezgin6784

4 жыл бұрын

Wow, respect sir!

There! The dreaded dual MOSFETs! Badass component. Great trace and fix as always. Kudos.

Thanks man, I'm a qualified engineer, Motherboard major faults isn't my best skill. You explain procceses bettter than anyone Iv'e been tough by!!

I think that Sorin is one of that rare people who know whats important in life.

i love the way you explain, so simple. Thank you.

it's like a quest... from video to video... i find new information with advancing in diagnose problem. Thank you.

fun watching you work! I dont even mind the ads anymore. Support:)

dude i love your work you are my idol especially the laptop motherboards. love from the Philippines!

Masterpiece of thinking and work!

Sir you are great!You are the electronics genious.Hoping for the videos tricky cases like this.Your explanation is logical.You are the great teacher too.Thank you so much.

Great Video Sorin, very informative

Reviewed this vid today again. Sorin you an expert in the doctorage level. Thanks for your tutoring!

I understand what you say. What a great job. You are a master in electronics, I'm learning so much with you. Thank you

Thank you for all You are the best

Another good informative video thanks sorin.

I learn new thing, informative video, thanks a lot.

Your videos are the best i ever saw and i'll watch all of them.ician, i fix things every days and you are the best i ever saw. You help me so much. Big thank you. So learning and interesting. It's always a pleasure to learn from you.

I'm watching you from Türkiye. I like it. thanks a lot.

always you are the best , thanks for your explain

my favorite teacher . i am following your lead daily .i love you techniques

Writing with both hands impressive keep up the great tutorials

As usual...2nd comment by me....I am really very very much impressed by your way of working and finding faults. No doubt you are expert among all of us.

From Colombia,...I´m thanksfull,....the videos are excelents to learn Electronic,......GOD BLESS YOU

Impresive! so fast fixing stuff.

YOUR VIDEOS ARE VERY FINE. YOU HELP ME TOO MUCH

all good stuff, thanks ...

Thank you, that was fantastic! Learned a lot.

Great Video. Thanks you.

very best..level best. sir you always won my heart. i eager to watch vedios. pls more on laptop mother board diagnosting techniques.pls

very nice. good job

Hello. Great video i can't believe the ram can take double power input and still working. Amazing :) you are werry smart and cool man :)

Very nice Sorin, good job!!!!

amazing work as always, these tips will be useful for any future repair

Great video and I really like your logic. Thanks.

Hello sir Thanks for the informative video. You are doing great job. Hats off 🎩

Great Video Sorin

💯 goood video sorin keep on

thank you so much , i like your videos

it is fun and im so impressed in watching every video you have master :D i gain some knowledge thank you for your videos im newbie in laptop repairing.. hoping someday i can be good as you sir..🕵😉 keep it up💗👍👍👍

Sir. You are The Grate Engineer.

What an amazing and useful video.Thanks a lot

Again a nice video. Very nice to see how u debug a fault. ur oscilloscope is a good one u purchased.. wants to see u work on that also show different usage techniques.

Nice work

Very nice. Difficult case but for another time seems easy in your hands

I have two laptops that need a eternal fan to cool. but the short on memory, I experienced today. An ACER Aspire tower, There was a module vibrating. It was not snapped in so I engaged the spring clip and started beeping I change the card out and that was it. Thank you for the "professional E-School"... RJ

Very nice and interesting job!!

Good job sir

شكرا لك على مجهوداتك

its important video thank you

Thank you so much,i like your videos

Good work you are teacher

Keep it up sir

Master Sorin!!!

thank you sir

Nice video. By the way, the new dual mosfet position can be easily found by the white spot next to the pin on the mb and the hole in the corner of the mosfet. You don`t have to check continuity on the mosfet pins.

from Jakarta, thx master

many , many thanks, sir.

Best best best teacher

Thank you very much

Thank you

World best number one engineer

Love you sir

You are the best

Salut . Mi se pare impresionant faptul ca poți scrie/desena cu ambele mâini.....👍🏻

For me it will be very interesting to tell as about your first days of work. How was with the first repairs and stuff. So on some of the next videos you can add a little story. :) Great video, as usual. Regards Yanko

@electronicsrepairschool

6 жыл бұрын

Thank you

nice video sir

Just got the same with Intel N2840 without a fan (as it is a small underpowered procesor) but as soon as it gets into Windows it will shut down completely. Sometimes keyboard is not working and blinking caps lock. Tried updating BIOS and replacing RAM and CMOS but seems to be the power supply of the processor or the CPU itself. How to diagnose that since it starts up normally! Thank you Mr Sorin for your videos!

That double mosfet that you replaced was a different as I recall and it still worked - I thought it had to be same exact letter/# combination - learned something new there

@protonx80

4 жыл бұрын

after all it is just a switch ... most of these mosfets are rated at 30v 20a ... and they switch on at around 2 to 3v ..... so should be ok

I can't stop to watch your video even more if it was too long,I think because you really fascinated about what you do!

Unbelievable sir but this is right way repair of laptop motherboard.

Kudos to you sir, so amazing. I have an issue with my client's hp 15ac007nia charging but not powering, when power switch is pressed, the power LED comes up and off in 2sec, is there any assistance I can get from you please sir?

To see what part is getting hot an easy way may be to use an infrared camera. There are some on ebay that you can easily add to your cell phone and they are not that expensive. Great videos thanks

you are amazing

Master class. After sitting through years of equations and graphs, I still don’t have a clue of how to diagnose a laptop fault. Those teachers needs to be rounded up and locked up.

@runthomas

4 жыл бұрын

most people who study electronics dont really know much...its this hands on experience that really pulls it all together..not oscilloscopes and theory. and calculations.(maybe for circuit designer)

@TrinitronX

2 жыл бұрын

I had the same experience. Finished my 4 year degree in EE, but came away with nothing practical... just lots of math and theory, no way to put it into practice! Sure, we built some LED arrays, did some LabView data acquisition projects, and got to play with lego mindstorms robots. Yet, I have no idea how to design a circuit or product from the ground up, much less diagnose or repair anything complicated. The closed-source IP & proprietary nature of these things is causing so many problems. Students come out with a university degree but no hope in paying off student debt unless they get lucky and find a job where senior level designers will act as mentor. Too much barrier to entry, and generational inequality on top of that! Not to mention the whole planned obsolescence & secretive IP model is also creating massive e-waste problems. Let's hope the right to repair movement is successful! Most of the electronics field is still way behind when it comes to Open Source & DIY learning resources.

just great :o :o

Can somebody explain to me how these MOSFET power supply work exactly? What does the coil/inductor do? Does the driver to PWM to regulate the output voltage of the MOSFET? Why we need a second MOSFET? I tried to find out myself but all examples I could are much more complex.

love these videos still hoping to find problem in a ibm board that i have laying arroun but that seems to be also hard... light works, but when pressing the button the laptop do nothing and power light goes off... so must be a 3v problem? but i found no weird things in that path.

Thanks sir yr videos are very important to me. I have that very kind of mother but with mine,the short is wt the capacitors close to the processor, Pls help me out on what to do.

Last night I had a Lenovo B50-70. It powered up and shut down for few seconds. Thanks for your diagnostic method I can check the key things! The 19V power rail was ok. On the memory power supply I measured 1,38V. After a few power up the memory got warm. The sticker on the memory module is burned a bit. I replaced the memory module to an other one and the laptop works fine. Weird Can the memory module go to short?

Y ar à good Man

Impressive how you can write with both hands

When you forgot the orientation. So did I when i was sitting watching and learning how to troubleshoot. But then I noticed on the motherboard it had a dot to show the orientation of the duel mosfet. Or atleast thats what I think it meant. Some have arrow showing orientation. But I dont know if all boards mark like this. So good Idea to know without counting on a mark.

Good Video. so if current sense loop tells the power control chip there is too much current it would cut the 1.5v reference voltage to the gate. and then retry. the 3 volts comes from the cap and the coil being charged and cut. similar to a voltage doubler circuit. even with the short the power control chip avoids damaging other components.

@electronicsrepairschool

6 жыл бұрын

everything its cuted down already there by the second mosfet based on the current sensor which is next to the second mosfet. 1.5v power rail is joined/shorted with 19v power rail. We have 3v on the memory because i limited the current from my lab power supply

great

Good job sir . In indonesia it called "rosok"

Maestro , hagase un video de las que no anduvieron así no nos frustramos de entrada!

Teach me Master!!

Great detective work you did there!

Master good morning

this is the best gut i have found to teach mr what i need to know BUT i need it to de more on what i type like ihave new motherboaed for my hp pavilion 17-g113bx power lites on but all of usuden pc won,t power up why?????

nice video sorin , what power supply are u using please thank you in advance

I dont have a power supply so i took a toshiba charger 19V-4.74A and connected the + and - to digital multimeter wires. This way i can see when the voltage drops. Am i right? Can i use this as a power supply? And your videos are very good. I am learning a lot. Thanks!

Nice job! Couldn't you make one bridge? for the one that was in short circuit? just saying?

is it necessary to match all the parameters of substitute MOSFET with the defective one while replacing ?

Recently I changed the motherboard (15CBHPGT) of my old laptop (HP envy 15t Q300) after HP service confirmed the board was damaged. Now after changing the board and connecting only the power cord without the battery, the power LED is turning on but the pressing the power button is not turning it on. No power to fan or HDD. I checked by disconnecting each connection, Ram, HDD, display but nothing solved the issue. I have checked the 19.5V to the board and the 3V to the power button. This is happening with the new mother board. Can you suggest what I can check now.

Sir I love and learn a lot of things from your video but I have a little to add to where u had difficulties in determining the type of mosfet. You can easily type the marking code on the Internet and know its value and functions and while replacing, you can do the same thing for the outstanding one you have @ your disposal to be on a safer side.

@electronicsrepairschool

6 жыл бұрын

easy way: If the drain is connected to plus=is a channel n

Hi, so why my all dell power supp;ies have on midle pin voltage 0.125v - 0,050v its that correct?