The Most Common Fault On a Laptop When is Not Coming on, Dead Mosfet

[@valejacobo]

3 years later and you helped me diagnose and repair a HP Dv7 I bought for almost nothing due to being "dead". Thank you so much, your videos were extremely helpful and encouraging for me. Cheers and love from Argentina

[@Pittsburghfix]

Just fixed my first motherboard, thanks to this channel. Mosfet had blown due to voltage being injected into the Ethernet port. Switched it out with one from a parts board and even though 2 of the pads were damaged it still worked when I bridged the three pins together, they were connected originally anyway, and it seems to be working now.

[@poptartmcjelly7054]

Not too long ago my friend brought a Toshiba laptop to me to fix for him. He told me it has been repaired two years ago and when i took it apart i found a big piece of copper wire across one of the 19V mosfets. Turns out one of the mosfets shorted out and the previous guy who fixed the board put a wire across one of the mosfets that didn't short out so basically the protection circuit was completely omitted. All it took to fix the board was to replace the one shorted out mosfet with a working one and the laptop works fine now and for a cheap budget laptop it has a great keyboard.

[@joeycarr1398]

How much $ should be charge for that job?

[@janermejia555]

Thanks for taking the time to explain the process through which faulty components are found, I find your videos very enriching. Keep up the good work, you deserve all the success that life can bring you.

[@joliettt]

I'm an electrical engineer, long retired. You are the best technician I ever met. I love fixing things myself too. That's why my refrigerator is 35 years old, my electric stove 35 years old, etc. I fixed the electrical power display on my stove so many times, using two broken displays to fix one. My Porsche 944 lasted 550,000 miles. Anyway, I wish you could show a video reading the pins off a USB power connector in my Dell 9365. Good luck. I'd send you my Dell, but you're in the UK, correct?

[@jshaw4757]

I'm looking into repairing electronics mainly TV and laptop but anything n everything really I have bought all the tools necessary and I'm considering getting a thermal image camera as I intend too fix boards myself but I just wondered if you have any advice in general you could share if you get a moment...cheers mate 👍

[@jshaw4757]

I know that's a broad question 😂...but just wondered if you could maybe give me advice when I get started on things would really appreciate it if possible thanks again

[@belleviebeautifullife8520]

Am really learning more from your videos and I love the way you diagnose board and the explanation and I am still learning more because I want to start my fixing business. Thank you so so much. Sunday from Nigeria.

[@arielcastro2810]

a pesar de muchas criticas que tienes por esta reparacion..revivi una asus s451lb que llevaba muerta 8 meses por polaridad invertida...le hice jumper en el mosfet y revivio...carga y funciona perfectamente desde hace 4 meses..gracias maestro!

[@israeltongi]

I want to thank you for the time and knowledge you give of yourself. I learned a lot hoping to see more videos at this level.

[@winstongrundy7289]

i like how u teach this.i learn by watching easier then reading.ty bro

[@fourkings7897]

KZbin just recommended me this, and i sub... Great video and the way you explain... 👍🏻👍🏻

[@GTR5055]

Interesting video

[@WilliamMabote-xg7mz]

You are good sir.i once repaired a laptop screen that was not powering backlights.you the best.thanks for your videos

[@eugenenault4935]

By passing the mosfet is not a safety issue? Why not track down loss of gate voltage. Enjoy watching your videos , educational and very calming to watch. Thank you

[@asedeyhot123]

waoh, i'm so happy right now.... watching your videos is the best thing I did since last month, My laptop m6-ae151dx isn't charging any battery , found out the useless capacitor after the battery driver shorted , I knew it was the one cos it looked a bit discoloured. chipped it off with a soldering iron and , walah.....Laptop working perfectly so so happy...that's over 200 USD saved

[@mehtabmanik]

I enjoy your talk beside the fault detection and repair. 👌👍

[@lgflanang]

Practical education at its best. Thank you.

[@carlossartori1818]

OK, Mr Sorin! Congratulations by your videos. From brothers tecnicians of Brazil!

[@hayatuworku3793]

Thank you for your effort in sharing your experience!! I am learning a lot....

[@michaelmccloy9466]

Hi Sorin, I missed this one in Nov. A really good one for me as I just watched your motherboard videos, it's all making much more sense! One thing I am having a problem with still is the recognition of some of the other 6 or 8 legged chips as you go around finding the power supplies. What are they? (I can't be the only one surely), my excuse is I didn't start leaning this stuff until I was 74 yrs old. Since this job came in as a MB are you sure he is not one of your applying the power supply here or there students?

[@QARepair]

I like Your way, you have budget cheap tools but your knowledge is worth much much more

[@kailasingle460]

Your explaining method is fantastic. But one question is there Sir what will happen if we dont connect new MOSFET and make just jumper directly.

[@haikalhakim]

I love your channel...I learn a lot from your channel how to repair a PC/LAPTOP....

[@Ask_joe]

" i dont care and i dont want to know " thats awsome like your repair ethics keep up with the videos!!!

[@romanb.6905]

The first time, I see a guy, who is happy, when the notebook is not working ;-)

[@gile849]

very hard to find problem on board when randomly work. must testing for days... Beter is not working at all for repairing.

[@n4_ku]

You bit me to it 6 month earlier, damn you are good.

[@jarnovilen5259]

Every man who earns his living from dead laptops is happy seeing one!

[@TanPham-sn3fc]

He's like God, resurrecting dead laptops!

[@roman4717]

How fix hat air machine

[@switzzzz1]

Great video now l know why newer mosfets come in two in one chips to stop Sorin nicking one.

[@massimilianobarresi.]

"Good the MOSFET is out and replace that MOSFET.. of course we replace the MOSFET.. of course.. what do you think about me?" i love this man xD

[@kobericha]

maybe you know why mosfet was not replaced?

[@johnathanasiou9284]

Awesome, simple tips. Mulțumesc mult Sorin !!

[@MOONTECHbd]

I like your Working process ...keep uploading with new one ! Thanks

[@antonioss6620]

You are the master of the masters. Thanks for your knowledge.

[@jetraid]

Could be the mosfet gate have a short circuit, maybe testing the gate after remove the mosfet you have the voltage and can replace it for a new one.

[@TheBaregel]

hard to believe ,the gate is isolated from D and S

[@freeblowjobforall2697]

​@@TheBaregel Yea but if there is issue, mosfet is broken, the gate can be shorted with S or D

[@jamesjakpo4197]

well explian sir,i really like your explanation on repair's of laptop.

[@DeolTech]

Good work sir .. thanks for share your experiences...sir iam from India I like your all videos..God bless you

[@oscargrouch8256]

Does the bad mosfet have to be removed? or can you bridge it in place?

[@mtngoat61]

Maybe an intermittent or dirty/oxidized contact on-off button for that first lab top which turned on most of the time but not others.

[@Mora_Art-r3t]

Omg this guy is so Good wish I had this knowledge.

[@axelcomC3]

I Respect professionals in their job!

[@NicholasDaniel11]

Thank you very much for this knowledge this is helping me as a young technician

[@jasengibson6619]

Those intermittent sometimes-it-works issues are painful. Occassionally they'll be from faulty discrete components, but most commonly it's going to be a simple physical layer problem--loose connection to a component or cable, cracked soldier line/soldiered pin loose in the socket, screw/frame metal shorting a circuit, slight break in an internal ribbon cable--and just by moving it, or holding it differently, flexing the frame in just the right way, you either make or break the intermittent connection.

[@elizabethtorres6069]

2:35 Frame I just started watching, there might be a short around the wiring in the screen panel, because when you layed it down it turned on. Your hands are around the display,and hinges. so was I right? Oh? We are not working on that one??? Ok next.

[@roshnivaldar2746]

good video on how to fault to a component level. thanks

[@zanthiel2009]

Thank you! Master Class Technique

[@johnf3278]

Great video learn so much. Can I ask you common problem with older dell.. "battery not recognise" and it won't charge. Could you find a fix. Why do they care what battery I use.

[@Martin-ot7xj]

Hi there , this tutorial video is absolutely is one of your best tutorial and is absolutely for beginners , you explained very simple and very good . please make more tutorial like this . as you can see you explain step by step . kindly make a tutorial video about how we can use power supply for diagnose short on mainboard for beginners like this video . thnx

[@donaldfilbert4832]

Very interesting. So - in summary. It looks like you kept the shorting wire in place instead of the mosfet - and still don’t know why there is no voltage on the gate and/or if the MOSFET is bad - or if the circuit feeding the MOSFET gate is bad !! So if that gate feed comes from the power management chip - aren't you worried that there may be some valid reason the power management chip isn't turning on the mosfet? Is there a possibility down the line that a possible real error might cause the motherboard or CPU or something to burn up??

[@waeiltobgy5301]

good diagnostic and fast solution to get error ,

[@datiller9035]

The Best Walkthrough video ever!!

[@tonsolar]

all of your videos was fantastic, easy to understand and follow! i like the way you teach very professional. thank you sir. Dave here. . (=

[@raduandrei7947]

I think some ``engineers`` are too tough with the comments. I prefer to short circuit a mosfet rather than throw away a new board or spend a day to find out why the mosfet does not get a signal in the gate. I think Mr. sorin does it because otherwise it would not be cost-effective to fix this.He just repair it so we do not throw it in the garbage because he cares and he likes this things.

[@sa112fpu2]

Thanks Sir, at your beginning of your presentation, it was very funny!!, I like your work and I would like to get more idea from you.

[@collinpomplun4265]

I see that you put a wire over the mosfet I'm assuming to test. How do you know which pins to wire together?

[@tikaziitech]

Nothing to say about you you are the best thank you very much

[@techmanray2355]

This platform is the best boss.

[@meshakjames8186]

your method is the best

[@Keythong]

So my understanding is that the mosfet is fine but there is no voltage on the gate because of some other faulty component? Is this correct, and if so what voltage should you expect to see on the gate in a working laptop? Also, why not trace back from the gate to try to identify the faulty component, or is it just too time consuming and it doesn't matter so much? Thanks in advance for sharing your knowledge, it is really appreciated.

[@deepaknanda1113]

Did u got ur answe ?

[@Labyrnthdom]

So how do you know what leg to jumper to. In order to pass the 19v ? I learned a few things from this video. But where I got lost was when you put the jumper and why not put a new mosfet?

[@TheBaregel]

the mosfet is fine,there is not input voltage to the gate from somewhere else that failed,he just bypass it,im not sure about the consequences of that move but i guess he knows his stuff

[@jaimereyes4157]

That comes from the way a MOSFET works, it is just like a water valve. The Gate controls the flow of water, on or off. If you bypass the gate (putting a jumper from input to output) you're just bypassing the gate. Also, the water in this case is a very very high current so you gotta be careful. Mosfets are essentially built, most of the time by 3 terminals.

[@MrNcimino]

Hello, mindblowing...but i need to know....i have the same problem. From where to where is the copper cable going? What could happen if we DEsolder the mosfet and plug de power supply?

[@onyetechcomputers9040]

I deeply appreciate your effort in making these wonderful and perfect videos. Which has helped me alot. May God almighty supply you more wisdom and strength and long life.

[@luckyluken]

Really nice videos, keep up the fine work, very very good

[@mokaku]

Sorin everyone admires your technical talent and I do too , but this time I want to say I love when you laugh :) 1:36

[@ovalwingnut]

You are the Electron Whisperer... Good show.

[@satriorudi3742]

Thanks mr Sorin you the master

[@sherazrizvi9977]

so detailed very thankfull

[@OE8ZZZ]

Hi! What pad are you using here for cooling the processor?

[@Nightowl_IT]

That laptop has a short that is only on if it is flat on the table. Check for a loose cable or dead solder joints.

[@ultrashock3202]

First time u show , as on the gate is no power so propably the mosfet is good , now we know how to continue.

[@nsohgodwill8612]

what a great teacher

[@ruelolingay2651]

wow inpormative thankyou so much..

[@bFABIO]

Did you putted another Mosfet? Because i have one after the power supply that heated and don`t have power. Can i take it out?

[@earthelder2065]

absolutely fantastic!! great video!! Thank you very much Master....

[@besllu8116]

Nice video, you are so calm an logical it is pleasure to watch you figuring things out. Subscribing.

[@johndzikunu9986]

You are ecellent, great. I have been following you videos with keen interest.

[@CA-AkshayDhake]

Hello I have been having an issue with my laptop .No power,even when plugged no charging light . I take out the battery and put the charger,a high frequency constant sound comes from near the charging port. Please tell me what could be the issue

[@felizhielerfezull8033]

Did you get a solution for your issue? I have a similar problem in aToshiba E45w laptop. Power in is 19V as normal but no power light or even charging light, and I have tested each point but no joy. I am hoping issue is a mosfet.

[@Kipster848]

Took some water damage from underneath (sat on a wet table). Computer boots up, but cooling fans run continuously and computer runs very slow. Hard drive removed.

[@MrSonic1953]

Just curious, why didn't you change the mosfet instead of putting a bridge wire?

[@seren7939]

good way of teaching..I like our accent also ;)

[@maxhernest2441]

hello I do not understand why connecting the source to the drain of the mosfet does not put the card in safety. I have seen many times in videos that a blown mosfet becomes on and therefore the card detects it and cuts it gate signal thank you

[@MatjazOzir]

Hey...great video...I was wondering how thin wire did you use? BR from Slovenia

[@Compasscard]

Any suggestions when a motherboard has no power, no charge, works on battery and the 1st and 2nd mosfets have been replaced. A BQ24725 is driving the gates for approx 20ms and then turns them off. 1.3s later the gate turns on again... etc... Jumping the 1st mosfet makes the laptop work but I noticed a very heavy current draw when the battery and AC charger are plugged with the bridge in place. Checked all caps and resistors to gate, ACdetect, etc...

[@ElTexMexAlex]

Lol that looks exactly like the hp motherboard im trying to fix. Same problem except I shorted the board by accident and it had no video at first but no gpu chip. I have been told that mosfet could be my problem. One thing I still cant understand is why I would have no video because everybody likes to point at the gpu and it becomes confusing to people who dont have a gpu. Thanks for the video, very helpful.

[@pedrof.7821]

Thank you for your awesome video once again. Quick question that got me curious, if you short those protection mosfets, are you still able to press the power bottom for 10seconds, forcing the shout down?

[@nosebluntbob7124]

Ever heard of mosfets not working then working a couple times for a short period again before they die. Trying to diagnose an xbox that was not working then worked twice for about 5 mins a few months later that is now not working again haha. Board has signs of short or ground out. But seems odd that a mosfets would fail intermittently

[@CornelPop]

The capacitor near mosfet what value does it have, how many uf does it have?

[@marko176schneider5]

Super Video.Danke!

[@gabrielgundulf7139]

that first laptop seemed to fault when laying down normally. but as soon as you put it on the side it worked xD gravity assisted fix haha

[@Sakhap96]

very very great job... thanks for all your lesson💪💪💪👏👏👏

[@Talented202]

Did you plug the battery in

[@AndrewTuboro]

Wow.😃😃😃 It's amazing.. I learned a lot from your video..

[@jasonno2953]

What are those cameras that you use to show some of the equipment?

[@01mustang05]

Is it acceptable to have "a short" signal through the secondary Mosfet's beside "the coil", even when the gate is drained or grounded to close the gate? Are some Mosfet's designed to sound as a short between the two sides of a Mosfet that is not the gate?

[@moncearazvan]

Felicitari !!!!

[@drbsr1948]

I checked my HP motherboard and the path on the power rail checked out ok until the 2nd mosfet which had no output voltage. Does that mean that the startup chip doing it's job and shutting things down or perhaps the mosfet is faulty or because there is a fault downstream? if so then taking out 2nd mosfet and replacing with a wire would do no good...correct?

[@veselanota]

master please show us same principles of this diagnosis on the desktop motherboards , thank you!

[@grzegorzzawada54]

Is that allowed to leave that bypass without replacing the mosfet ? : )

[@amtpdb1]

I know this is old, but I hope you still read questions. You have 19 volts on one side of the cap after the mosfet, what do you read on the other side of the of the cap. I have a video card where it has2 pin(3 pins but the center drain is cut off) and I get 12 volts at the drain but nothing out of the Source. There are 7 of these right together . 2 of them read 12 volts in, nothing out and nothing on the rest at all. I tried to check the caps as you did to check for short but I don't know what I should read on the second side of the cap. Should it be the same on both sides of the cap? If you find the time I hope you could tell me about the other side of the cap and or what to look for. I just purchased another of these boards so that I will have something to compare to. Thanks for your videos.

[@hmimed73]

very nice job, thanks for all your videos

[@computersrepaircotesaint-l7407]

So the mosfet was good it just didn't receive the voltage on the gate to open it? What a bypass Thanks again

[@techmonster2632]

mosfet getting signal on the gate from other component , so the other component is bad if the mosfet is good in this case>>lol

[@verdunelectronics9985]

i loved this video sorin you are funny

[@RandomPNGClips]

hi just a question, did you solder that middle part with pin 2? also can you do that way to pins 1,2 and 3? by the way i love all your videos

[@krouchioumamal4567]

Thank you teacher

[@jerryanstey7058]

At 19:33 Is there a mosfet missing already on the left side of the board ?

[@raftt8050]

hi Sorin is it possible to have both first 2 mosfets not functioning .cause when i plug the charger both of them get very hot in the same time ,everything else looks fine except those two mosfets .the original charger stops powering the laptop as soon as i plug it in .but im using another one .thank you i really love your videos.keep it up and stay safe !!!!