Motherboard repair tips & tricks - Toshiba C850 laptop not charging, not turning on - a simple test

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[@Radek__]

5:12 warning for others: please do not inject 19v on the main power rail for fun, when normally that voltage is missing. You can be lucky, or you can inject 19V straight to cpu/gpu/chipset IF any of the mosfets or PWM controllers are partial damaged or not working properly. Always there is a reason when the motherboard cut down the main high voltage. Sorin started... with correct voltage - he injected 0.9V on the beginning to the main rail, and he discovered that there is no short, so he assumed that it is safe now to inject 19V. I agree with him, but he didn't told you about the warning, that if you want to inject 19V, you have to start from 0.9 in the first place, which is typical cpu/gpu voltage.

[@hpmobilerepairing6206]

Smart

[@techas8005]

That is very common on every single tutorial on KZbin that is not everyone is an expert, but the author often missed to just warning for newcomers.

[@monkeywithaskirt]

thank you sir!

[@IvanGarcia-rg8ww]

Excellent advice, thank you!!

[@houseofpainINKS]

Only thing I disagree is u commented str8 to the viewers instead of directing it to the maker of th3 tutorial Makin ourself seem smarter than the man himself, btch move

[@Corporatizm]

I work in IT but I'm a total noob in electronics. I just like watching your repairs cause it feels like magic to me. Also, you have a very enjoyable personality and explain what you do well. I think in this day and time, you're doing god's work by not only repairing stuff, but also showing everyone how to do the same. Kudos and much respect to you sir.

[@LostSheepful]

Amazing! If he hadn't taken time to explain, it'd take him 2 minutes start to finish. Have to say, Sorin you have a gift: Teaching difficult to grasp topics in a manner others can fully comprehend. Very few and also the very best university professors share this quality. (Most practice linguistic ambiguity. ) College kids: Sorin is an excellent standard to hold professors to. Before "add/drop week," professors who haven't made you understand concepts well the first week, a) can't & b) don't improve and c) waste your semester.) I feel blessed to be able to learn from you Sorin.

[@daffyduk77]

dissembling/reassermbling does take a few extra minutes at times. Quicker with Toshiba, older fujitsu. Some older HPs were a bitch

[@mamunhasan1672]

Halo Mr Sorin. A very warm thank you from South Africa. I just fixe a Toshiba Satellite c850 with you help. Its probably same model laptop as this video of yours. And the same solution too. Thank you sir for giving me courage. I will post my successful repair on KZbin very soon. One more time Sorin thank you very much to share your knowledge to us.

[@TheTigerak]

He is the one best ever guru presented on KZbin. Naturally skilled! I learned a lot from him! Thank you Sorin!

[@beentheredonethatunfortunately]

Nice. Along with other diagnosis and repair videos it shows how nice and simple things can be. I just need 1) the tools to deal with SMDs, 2) the eyesight to see that small properly, 3) the time to devote to dismantling, fixing and rebuilding, 4) the space to store all the tiny screws so that I can find them again when I can't meet the criteria for point 3), and 5) the courage to do it.

[@Marauder1981]

Although I have not the faintest idea about electrics I love watching your work. Hope you can explain sometimes a little bit for us non-schooled watchers.

[@FrenchSmitty]

An absolute brilliant diagnosis!

[@rongray8934]

Thank you for sharing all your knowledge with us. You are such a great teacher and explain things really well.

[@alexgreis]

I want to thank PCBWay for sponsoring this channel. Sorin is one of the best at repairing laptops. Thank you very much on behalf of the community.

[@vincepirozzi9603]

Outstanding as usual. 😊

[@JohnStoneUSN]

Bravo !!! Salutari din Chicago !!! Super lectie. I had a friend of mine having the same exact problem and was a Toshiba too. You are the best !!!

[@djej2821]

Thank you for your easy and detailed way of teaching new students to have their way to be computer tech fans including me .

[@jameswatters9592]

Always good to listen to you

[@gregtechcomputerfix5461]

My first time actually understanding how to trace power fault in 5 years + thanks a lot for this video sir

[@wisher21uk]

Nice teaching experience thanks Sorin 😊

[@olawaleolusegun]

nice job thanks really blessed by your lessons greetings from Nigeria ❤❤

[@lasurvivor47]

Thank you Sir for your time on this video. Helped me a lot.....Cheers!!

[@ray-charc3131]

He lastly told the reason and true story. Good, many people wouldn't tell this. I am totally not a computer repairing guy, just an electronic engineer. Lately, l need to repair my failed old laptops. Luckily, l can find those motherboard schematics on the web. By tracing the problem, a failed mosfet on power rail area found, it was caused by a failed capacitor that shorting power rail to ground. Today, I see this video

[@TheQbasso]

As always I have learned something. Thank You!

[@castercs]

Fascinating .. love these repairs.

[@j-zymarz]

I love ur passion in repairing electronics. It doesn’t matter wether the device is too old just focus on objective in finding out the problem. Keep it up Sir 🫡

[@DelfinLangreo]

thanks for sharing sir more tips i always love to see more of your videos on how to fix laptop issues more power to ur channel

[@user-qg8rj9ed1r]

Thank you, good video it held my interest till the end.

[@kudzaim7251]

This was a nice to the point and educational video

[@marcosvc76]

GR8 JOB. Congratulations!

[@rookiexreviews]

respect sir got yourself a sub. your a wizard you remind me so much of my world of electrons intro class

[@JuJu-fi8oo]

Not my cup of tea but it was so informative and well narrated. Well done my friend. Keep the videos coming.

[@falkorock]

Great work! Thanks FR

[@chumatez]

Nice Explanation

[@littlebigplanet321]

Beautiful video!

[@SohanDey-mm1dx]

nice explanation Sir .... Thanks a lot

[@Tugolandia]

Great video! It helped a lot.

[@QuantumTraderSolutions]

Sorin, you are such a genius :-)

[@Mcfreddo]

Very good, thank you!

[@King_nanagh]

Love this. subscribed

[@parakidd]

I buddy that runs a computer repair shop had a bunch of laptops (40 plus) ranging from windows xp to10 that he just had sitting around because the recycling place he used to take them to shut down and he can't legally just dump them so he offered them to me since I like tinkering. I've never done motherboard repair so this going to be a fun skill to learn. First time seeing this channel and just subcribed.

[@healthystyle]

Great Video....Thank you.

[@hackintoshslovakia368]

thanks for this great tip !

[@homeralbufera7068]

Very informative tutorial video.

[@marcelobravo4270]

Awesome !! No isopropílic alcohol bloodbath , no flux bucakke. Perfection ...

[@laidman2007]

Very useful. Thank you.

[@frankoattes]

Spring, do you actually teach people this from scratch? Often there is too much background info on how these things work, some people only want to know a path to walk from power going in at each point so that they can actually see no power at certain points. There are too many people that go through the science, ohms law, calculations etc and some people can’t take it in that way. The easiest way is to see a simple on off type of explanation to a circuit. That’s what you done in this video and I really enjoyed it. Simplified and no long winded explanation. Keep them coming!

[@ephraimkimathi9018]

that was a very informative video.

[@therealbarnekkid]

The man is a genius.

[@masoudmontazery907]

Good luck sir 🎉

[@AjaySingh-us6vl]

Thank You

[@SiETechNotebookReparatur]

...no more proper calibrated bridges :)

[@mustaphaessahihi1762]

Those were the old gold days

[@jarnovilen5259]

I kinda liked that brute force approach.

[@Negiku]

The first laptop I ever repaired was using a proper calibrated wire I learnt from Sorin.

[@jbear40]

Congrats on your sponsor!

[@irishguy200007]

I love these older toshiba laptop even though they had graphic chip problems.

[@turkalpkucur]

thank you

[@davidgooden219]

Good stuff

[@user-jw7mk6pc2i]

Спасибо! Не ремонтирую ноутбуки, но за ваш труд и открытость - огромное спасибо! Хороших вам клиентов и интересных работ

[@PauloVitor-rv5dc]

awesome, u are incredible, greetings from brazil

[@sixtusokoye7221]

Nice it's educational

[@viktorzizic8090]

Tnx man for show this ❤😮😊😊

[@lawrencenjue2731]

Thank you

[@andrewdewar8159]

Awesome !

[@suprmeatdude]

Resetting bios password for these Toshibas is super easy. There's two pins next to the CMOS battery that you need to short and it's done.

[@cerikamel1218]

thanks

[@claytonbennett7797]

What a legend

[@Geert365]

Oké, i sometimes watch these vids , not for a while though, but now this one was in my recommendations, and just bought a second hand laptop to try and fix up. Guess which laptop. indeed an i3 toshiba satelite from 2012, specs not sure, but looks exactly like this one. What to make of that, the coincidence (if it is just that !?) i mean. PS It was i think the only one of this channel on there, certainly the first one.

[@rizwanshaa]

U are a master blaster❤❤❤❤

[@Somanathan-hj7ge]

Very good 👍 sir

[@mcgreedytv]

my idol technician

[@muriuwangai3617]

Am impressed with your content all the way from nyeri kenya. I would like to be your student.

[@ercost60]

Nice! I have a stack of Toshibas I'm selling off before Windows 10 support ends next year. They are still good machines for basic Internet access and streaming.

[@space_cowboy007]

you can get windows 10 iot enterprise ltsc to update until 2032, there are ways to get it activated

[@OMARENGG22]

You are the best

[@BHSAHFAD]

You have a very relaxing voice

[@DARKNESS19906]

I fix one loptop yesterday i follow the what sorin said.. And 3 more in this day.. Thank you for this man.. legend aim from Philippines.. Cellphone laptop technician. 😇😇😇😇😇

[@LastOneNW]

Very nice video! I just wished my laptop motherboard had components that easy to identify lol, everything is so small I can't even identify what are the mosfets to check =/

[@bettergamingchairwins2442]

Hi, love the videos, what temp is a safe temp for removing a mosfet like the ones in this video?

[@robpet4424]

If I was Captain of a Starship I'd want Sorin on board for sure 😃

[@user-he8kk6lq7p]

woOo|OoW very niCe repair ❤👍👍

[@CanaldoZenny]

How do you know what values the mosfet chips should output in the multimeter? And what setting are you using on the multimeter? I assume it is 20 DCV.

[@durdy911]

New to your channel. Very Interesting video. What temperature do you use to reomove the small mosfet? New to these types of repairs with Rework station. Thank you.

[@fuzexi]

That’s amazing. My old MacBook died a few years ago. No power, not charging. I hope I can bring it back to life!

[@ytrew9717]

you have nothing to lose, please make a video while doing it (even if you burn it, it will be interestnig!)

[@FrankensteinDZWOT]

You make it look super easy i have only one question how do you know which is the gate and the source leads on the mosfet?

[@amazujoseph1810]

Hi Please do you have beginner tutorial class on laptop repair and bios stuff, I don't know what a main power rail and all those voltage stuff, I would be glad if I could get ur beginner videos

[@venerandarain3]

after i watched more than 100 your videos, finally i took a step to repair my own Laptop, and finally lucky me, found a shorted capacitor.. thank you very much for all lessons you gave to us Sorin, Salute From 🇲🇨INDONESIA🇲🇨

[@glandersonbooper9342]

Now you are ready to open a repair shop!

[@rverm1000]

your better at this than i am

[@sporadice1977]

Hello. Amazing work. I'm just curious how does one begin to learn repairs at this level. I've been wanting to learn but I don't know where to start.

[@joeclone2686]

I've always wondered why the 2nd mosfet always smaller size than the 1st mosfet?

[@balik.electroservice]

selalu hadir pak

[@avertry9529]

cirr-quit to sir-kit If it helps, but it does add character.

[@jerrodrollins1509]

I want to learn how to do this so much! Like, in familiar with low voltage stuff like wiring and I do know some basic electronics, but what kind of education would assist me with this?

[@teemum.9023]

11:10 I learned that pressing the power button means connecting the ground with something in the power button connector. Did you connect ground with minus (neutral) or plus (live)?

[@demzzboy]

How do you connect your charger to the multimeter?

[@leniprof]

I have Dell laptop that died when there was a power outage, and it drained all the battery. After that it wouldn't turn on either on battery, or without battery. It stayed silent for 3 years, and soon I took it out and miraculously resurrected.

[@Electronics_Repair_NZ]

check on da screen !

[@Soloptech]

Mostly the first MOSFET 😊 is the problem here. I have seen this problem many times in this Toshiba.

[@craftymulligar]

The power supply mine came with started to have charging problems laptop took to lower computer performance issues. So bought new higher wattage laptop power brick for the barrel plug. Still low performance. Lucky it had hidden usbc power delivery port. Didnt know that because it was over 7 years laptop. The performance was back but already bought a new laptop. Use the old one but the screen is also bad and battery. Use the hdmi to a monitor take off bad screen use it for small gaming computer.

[@lungeloma3553]

Hi, what is IC P24, motherboard burnt plastic cover

[@teemum.9023]

8:05 how does a circuit tell the first mosfet that the second mosfet is shorted? Is the circuit inside the first mosfet? Where are the signal paths?

[@sherifsamy6129]

hello Mr engine the mosfet you put in mother board donot carry the same number of damaged mosfet is it normal with power circuit

[@2XXEquiz]

I have a power suply issue on a most modert circuit. It has been dificult just to ID the components because I dont have the diagram. Do you have a video for this Chinese made electronics that apparently are made for NO service devices or "NOT Serviceable" therefore a buy-use-break-throwaway device but since they are quite expensive Im thinking they should be serviceable. At any rate, I am dealing with a car stereo head unit based on Android with a 7 inch LCD screen and Android Auto to control sound, GPS, Cameras, FM/AM Radio. The electronics on the main board are much smaller than the ones found on laptops but not necessarily impossible to work with, I am just missing the right tools. The way this unit broke was that it received +12v on the external amplifier remote control or remote start signal cable. This cable already has 12v coming from the head unit so I am not sure what it did. There are two hypothesis, that was the first, the second was that it did received a -12 vots from the secondary battery installed in the rear of the vehicle for audio and other accessories. Its been a pain for me since I messed it up and even though I can and I already replaced my stereo with a more cheap unit, I still think I should try fixing this one. Any advice from the Guru or the students other than "throw that piece of garbage out" it seems I could separate the power suply from the rest of the board if I can identify whre the connection is been made.. any takers to help you will gain a lot of experience if we make it work or find a workaround. TIA for reading this far.

[@Natureshoot312]

Please make a video how to fix dead, no power dell Inspiron 1570 pc

[@aliemlek]

👍👍👌👌

[@Kpm_tach_balaji]

How many voltage and amps set in dc machine laptops

[@MsQwerty65]

Hi My friend, i have the same mother board turns on but when i plug the exterior monitor in the VGA port the display on the monitor turns off and u have to know the monitor works fine with other mother boards, so what do you think the problem is ?