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.

[@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!

[@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

[@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.

[@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.

[@marcelobravo4270]

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

[@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.

[@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!

[@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.

[@user-jw7mk6pc2i]

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

[@wisher21uk]

Nice teaching experience thanks Sorin 😊

[@lasurvivor47]

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

[@TheQbasso]

As always I have learned something. Thank You!

[@castercs]

Fascinating .. love these repairs.

[@vincepirozzi9603]

Outstanding as usual. 😊

[@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!

[@jameswatters9592]

Always good to listen to you

[@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.

[@olawaleolusegun]

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

[@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 !!!

[@King_nanagh]

Love this. subscribed

[@djej2821]

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

[@chumatez]

Nice Explanation

[@falkorock]

Great work! Thanks FR

[@laidman2007]

Very useful. Thank you.

[@kudzaim7251]

This was a nice to the point and educational video

[@user-qg8rj9ed1r]

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

[@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

[@Tugolandia]

Great video! It helped a lot.

[@littlebigplanet321]

Beautiful video!

[@QuantumTraderSolutions]

Sorin, you are such a genius :-)

[@ephraimkimathi9018]

that was a very informative video.

[@rookiexreviews]

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

[@homeralbufera7068]

Very informative tutorial video.

[@hackintoshslovakia368]

thanks for this great tip !

[@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!

[@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!)

[@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. 😇😇😇😇😇

[@therealbarnekkid]

The man is a genius.

[@davidgooden219]

Good stuff

[@sixtusokoye7221]

Nice it's educational

[@turkalpkucur]

thank you

[@PauloVitor-rv5dc]

awesome, u are incredible, greetings from brazil

[@viktorzizic8090]

Tnx man for show this ❤😮😊😊

[@lawrencenjue2731]

Thank you

[@BHSAHFAD]

You have a very relaxing voice

[@claytonbennett7797]

What a legend

[@rizwanshaa]

U are a master blaster❤❤❤❤

[@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

[@Somanathan-hj7ge]

Very good 👍 sir

[@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 😃

[@OMARENGG22]

You are the best

[@dmisi1]

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

[@marcelobravo4270]

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

[@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 =/

[@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.

[@joeclone2686]

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

[@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.

[@user-he8kk6lq7p]

woOo|OoW very niCe repair ❤👍👍

[@avertry9529]

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

[@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.

[@artmanstudios7037]

Laptops aren't that costly just toss it and get a new one! Best way to go about this is by brand, like which brand lasted you the most? I stay alway from HP! They don't last long, toshiba however is a good choice! They lasted for me for like ever while a taking a good beating and until they got old and had to get another more up to date!

[@ericjarvie]

My world is full of broken Laptops so much so i am never buying another dodgy Laptop as im sick of burnt out hard drives and stone dead EMMC chips aswell i was wasting shed loads of good money after bad on dodgy Laptop batteries. .So i got an SBC (single board computer) now my worlds changed and im never looking back..also with Sorins help my old Laptops will be repurposed as i cant suffer to throw them out but i swear that when it comes to Laptops i will never get conned again..!!

[@Natureshoot312]

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

[@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?

[@splatt3d]

woot woot... we have sponsorship!! pizza for everyone!

[@akierum]

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

[@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.

[@demzzboy]

How do you connect your charger to the multimeter?

[@Electronics_Repair_NZ]

check on da screen !

[@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

[@balik.electroservice]

selalu hadir pak

[@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....

[@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 ?

[@ogunniyiadebambo2822]

Thank for the video ... pls i have a mini dell when yiu press the power button the system will display and cut off as if the power was remove from system without battery inside hope you get my message... i need your help

[@CliveTrezona]

I thought if the source & drain is shorted its the same as the mosfet being switched on?

[@lungeloma3553]

Hi, what is IC P24, motherboard burnt plastic cover

[@Soloptech]

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

[@BalajiBalaji-ef5ym]

How many voltage and amps set in dc machine laptops

[@estonian44]

uncle, thank you, i have old HP laptop elite book 84 something, and when i plug it in it keeps swiching on and off, then one time, suddenly it works fine.... then same proble again, and i notice when i plug in one house, it does restarting, if other house, it dosent even swich on, and sometimes if power right it works properly, also when its plugged in... the electricity runs like inside all metal parts so i can get a small electrocution, can i repair it at home, what should i fix?

[@diycropc]

when starting, the power light comes on for 5 seconds and goes out. The fan also works in those 5 seconds, there is no picture at all. Can you advise what to check first. It is the mbo la-b991p

[@sloopycat1954]

Hi Sorin and everyone. I have a Lenovo yoga 260 thinkpad laptop that I forgot the username, password and bitlocker key, is there a way I can delete the username, password and bitlocker-key please, I would really appreciate any help Great video thankyou.

[@0986srikanth]

What exact mosfet we fix to motherboard.. P channel or anyother

[@Kalma-cn]

nice old day, simple circuit. no usb c shit

[@orange11squares]

usb-c is the highest failure, it the main thing for planned obsolescence for laptops, phones, tablets.

[@sumeerkhan368]

Hello ❤ sir.

[@vexed3185]

How to know if it is the first mosfet or seconf mosfet? sorry, i didn't get that part.

[@TymexComputing]

Winner winner chicken dinner! Or pizza ;)

[@marceloaug]

Thanks for sharing your knowledge with us. Really appreciate it.

[@aliemlek]

👍👍👌👌

[@payusavisit3482]

In my case, I bypassed it. It worked, but the battery is not charging. Can we convert it with a 3 legs mosfet 😅

[@GlishaSo]

nice easy job i wish they continued to make laptops like this much simpler for us who like to repair motherboards.... new laptops are insane with all kind of faulty chips etc... they do that on purpose to destroy our business to make most of people to head to shop and buy another laptop :( :(

[@jaym5938]

What indicator suggests the main power rail (where you injected V) when it's so close to the CPU? Can we look the rating of the capacitor for an indicator? Or are there other signs? thanks

[@IFIXCASTLES]

😊😊😊😊