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

[@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

[@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

[@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.

[@masgains9256]

Totally agree with you on that! I work in tech too and find these videos so useful and enjoy every bit of it!

[@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!

[@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.

[@rickwhitebeinz]

Hello Sorin! I subscribed to your channel and I love every video you produce. All I wanted to say in this message is that I respect your work, humor and ingenious solutions for customers with "dead" laptops. I just wanted to say hello and thank you for the great videos! I really like each one! I'm a retired IBM technician at the former IBM Endicott facility, New York, USA (1974-2002) I'm almost 75 years old, and I don't repair hardware or software repairs any longer. Thank you very much! 😊 Rick White

[@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.

[@akierum]

Every video should be like this, proper zoom, proper explanation.

[@TheTigerak]

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

[@iam.masoudsamimi]

This is a 'Sir Sorin Repair School' ❤ Thank you master Sorin and may you live long sir 😇

[@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.

[@bradstudio]

Your channel makes me want to take electronic repair night classes as a hobby.

[@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.

[@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 🫡

[@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

[@gregtechcomputerfix5461]

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

[@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. 😇😇😇😇😇

[@irishguy200007]

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

[@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.

[@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!

[@manISnoGOD]

slowly iam building my lab. still need a bench power supply GREAT info as all your other videos

[@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.

[@FrenchSmitty]

An absolute brilliant diagnosis!

[@JuJu-fi8oo]

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

[@djej2821]

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

[@аватар-д2т]

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

[@EMMANUELISAIAH-s7q]

Good work boss... I am in the journey learning motherboard troubleshooting... I have really learn a lot... God bless

[@dmisi1]

The most innofensive pcb way advertising ,....... Congratulation !!

[@marcelobravo4270]

PCB Way ... your design today , our products tomorrow .

[@nichtverstehen2045]

your expertise in computer repair is clear and sound. how would you feel about something new? like assisting me repairing my almost new thinkpad w540 that doesn't want to turn on and doesn't show any signs of life. we can do it via youtube so all you subscribers and newcomers would see new channel format :) the only reason for that to me is that there are no computer repair shops on small island where i live. i'm based in small caribbean island.

[@olawaleolusegun]

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

[@vincepirozzi9603]

Outstanding as usual. 😊

[@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!)

[@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.

[@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 !!!

[@rongray8934]

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

[@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

[@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.

[@bettergamingchairwins2442]

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

[@ForexTrading-e3b]

I'm so glad to chance upon your channel. You're truly a master imho

[@robpet4424]

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

[@iggysixx]

Thank you for this. You make it very easy to comprehend

[@wisher21uk]

Nice teaching experience thanks Sorin 😊

[@marcelobravo4270]

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

[@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.

[@abdullai123]

Thanks Respect E Sorin😊

[@alarmsquadnj]

Amazing work hello from Puerto Rico love your work

[@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 =/

[@therealbarnekkid]

The man is a genius.

[@newmanwape1887]

I wish to be an apprentice to such a great pers9n. Thanks for the nice video🙏

[@BHSAHFAD]

You have a very relaxing voice

[@lasurvivor47]

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

[@AimGobalWorldBibleSchool]

Thank you sir..Outstanding!..

[@agenziaviaggipuntopartenza702]

you make the work seems so easy👌👌👌 👌

[@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

[@chumatez]

Nice Explanation

[@marioalday5966]

I own an HP9840WS this was the old Compaq with the same number, just before HP bought Compaq. At the time it was the flagship of Compaq. The problem history of this laptop is intersting. I noticed it got very hot (above 100C on the cpu area) and then it dit shutdown by itself. This happened about 10 seconds after the laptop was started. So i replaced the fan and pipe vents. Nothing changed. I replaced battery, same result. And finally i replaced the whole motherboard, and gues what? The problem is still there! I can figure out the second mother board i bought was very likely suffering the same problem. In one case like this , what part of the laptop you would start to look at?

[@rookiexreviews]

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

[@QuantumTraderSolutions]

Sorin, you are such a genius :-)

[@perunut4656]

Im subscribing....he might give me some clues why my inverter is not working and how to fix it in the future :)

[@jbear40]

Congrats on your sponsor!

[@hogfishmaximussailing5208]

I owned a computer repair shop for 15 years. I’d say 50 percent of laptop repairs were bad batteries and overheating. Then it would be drives, screens and floppies in that order. We tended to stay away from main board replacements. Most laptops are too cheap to warrant the cost.

[@gigachad7819]

Hi Soren, can we just connect a jumper wire instead of the mosfet. What will be the effect on the laptop?

[@DawnDavid-k9c]

Sir, you are great. Thank you 😊

[@marcosvc76]

GR8 JOB. Congratulations!

[@joeclone2686]

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

[@TheQbasso]

As always I have learned something. Thank You!

[@hadibq]

Thanks Sorin❤

[@jameswatters9592]

Always good to listen to you

[@tundedegla3385]

You are a great teacher. Can you please transcribe these tutorials, becos the accent makes them difficult to understand.let us be able to read what you are saying on the screen.

[@Electric-Bob]

Wow Sorin...you went from Beer to Champagne!

[@castercs]

Fascinating .. love these repairs.

[@kudzaim7251]

This was a nice to the point and educational video

[@bingobongo-e5v]

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

[@Sam-is1kd]

Can you tell me sir please which model heading gun you use for remove the small chips or etc ?

[@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.

[@old-gamer-01]

YO DUDE! Your channel is PURE GOLD FOR ME! HAVE A GREAT KARMA CREDIT Mr. ;) ❤❤❤

[@SohanDey-mm1dx]

nice explanation Sir .... Thanks a lot

[@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.

[@judeshgovender6729]

very good work

[@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.

[@techprodippro2224]

This was my first ever laptop, this was purchased by my late father with 400 Rupees... Thats the reason i fallen love with laptop repairs ❤

[@falkorock]

Great work! Thanks FR

[@avertry9529]

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

[@masoudmontazery907]

Good luck sir 🎉

[@pepeluis670]

What an easier way to teach repair, I would like to take a course with this teacher, but I am very far away, and my biggest obstacle is the language, (I speak Spanish and I only use Google to translate)... Thank you, I still learn a lot on this channel

[@muriuwangai3617]

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

[@laidman2007]

Very useful. Thank you.

[@homeralbufera7068]

Very informative tutorial video.

[@stefa-iu1ov]

Wow great man. I wish I could be there to see this in person. I think he speaks Russian or another dialect

[@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.

[@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?

[@Arvidje]

check the 4 pins.. 3 or 4 pins are always connected, if u have 3 pins connected , that side has the gate and so the other pin is the gate.. or in most cases u will see the track leaving the pin..

[@King_nanagh]

Love this. subscribed

[@WonsunKim]

always thanks Sorin for you video. this time I have a question. How you do find the 2nd Mosfet fault not charging IC. there is not gate signal and source voltage. you didn't even mention about the gate signal from charging IC. I thought becuase of no signal to gate. anyone can explain to me?

[@g4z-kb7ct]

Sorin, just a FYI bios pw on Toshiba is not easy to remove. Removing battery does not help. Toshiba has a code that needs to be cracked. The info is not widely available but some random people on forums sometimes provide some cracked codes for $. Would be good to have the actual info to crack this bs out in public domain....

[@drallersouldust3054]

I think I'll give my laptop to professional like you I don't want to do dumb thing anymore, I'm not good with it and I don't have spare parts

[@Mcfreddo]

Very good, thank you!

[@littlebigplanet321]

Beautiful video!

[@lawrencenjue2731]

Thank you

[@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?

[@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.