Sorin you're not getting older, it's the learning curve that never ends

Sorin, no mistakes... Oportunity to learn. As you said, you never seen 3 mosfets in the input circuit. You are one of the best techs i know. We all are getting old, i'm 48 this year, you still have a lot to teach us. Greetings from Portugal 🇵🇹

Sorin, with your channel I order too many pizzas. 😂

You knew it at the beginning, was a shorted mosfet, the factory loves playing game with Sorin. thanks

lesson to learn: check for a third mosfet and maybe a fourth who knows 😂even if the datasheet doesn't show it. But seriously why a third mosfet ?! because we can't say this will help the other mosfets to carry more current because it's not parallel 🤔Great job Sorin🎉

First off I would just like to a bug thanks for all your time and effort you put into making these videos and sharing your knowledge, I've learnt so much more.... Just one thing when it comes to MOSFETs... If the part number ends with an even number then its a channel N and if it ends in an odd number then it's a channel P.

Once again never to old learn, you are the master of electrons you get a pizza!!!!🎉🎉🎉🎉

Sorin, we are all getting old, and that doesn't mean we can't do what we just do as far as speed. I am on the same page, I noticed more that I overlooked and missed a few things here and there, but in the end, things that other people could not make the repairs or fix the issue finally resolved and got fixed thank you for sharing your valuable information.

You need a microscope to repair your microscope hdmi port 😂

WOW what a fix, very nice video, 3 fets a new one you taught us so dont feel bad this is very good video. All others watch all ads and dont skip to support sorin !

I had a very similar case like 4 years ago on a Toshiba, had a shorted cap and mosfet. When cap was removed it worked but wouldn't charge battery, until we figured out one mosfet was damaged too.

Sorin you are not a beginner you are the master 😊

cool you discover a third mosfet on planet pc ;-) we ll name it "sorin's mosfet " for remember it ))

SORIN, it would be most helpful is you could explain the difference in how the N v P mosfets work in these situations for us beginners?

Hello 🤝don't be sad, we learn all our lives and in Poland we have a saying: it's darkest under the lamp, best regards👋👋👋👋👋

Don't be so hard on yourself...There was no voltage on the gate, replacing the BQ Chip was the logical thing to do. A third mosfet could throw off anybody. Your still the Master Blaster and a Very Good Teacher I learn a lot from you.

My company bought 10 of these.... in 3 months 6 of them went back for charging issues . Where is the old Toshiba that it was working for 20 years ? Also very lucky connecting ssd with battery and charger already connected to power 😊😊

That third mosfet really is odd. Great job Sorin.

Thank for this new lesson Sorin, don't worry you are not became older, the experince is a never ending story, bye Francesco Timpano from Florence Italy

The capstan tape was left in the wrong place. You can always find something left a bit sideways on these Sorins videos!-)

We cannot, under any circumstances, dispute your expertise. This is our great Sorin, and we are very grateful. Thank you again. btw: Don't be too hard on yourself. We're all human.

Master keep on learning the new thing but his follower keeping on learning his foot steps

You've got older!!! But your mind still going shine 👍💪

Don’t beat yourself up over a couple of silly mistakes! You’re the best!

I should upgrade the theory of 80% of laptop problem is found on the first two mosfets to the first three mosfet😎

Never too late to learn something new. 😊

Exolete video .. saying that i dident know that I could change battery’s with the laptop plagued in .. wish you well

Thanx Sorin

Hi sir this was a good video to observe the diagnosis methods how to approach the correct way to check thanku

Sorin 😂 can talk about switching power supply & the little switching ic or chip & resistors, caps, the outputs and inputs, 😅

Thank you for this video Sorin, thanks to you I learned a lot and now I know that I can expect up to 3 mosfets in the circuit. Don't think only those who do nothing. Regards

Toshiba laptops are unique.

hi sorin how are you ? i want to appreciate you and your channel about the very good content that you presenting to us i learned a lot form you how to diagnose the faults and the way to fix it many thanks i wish you all the best

We should have used thermal camera to detect the short but I think Sorin knowingly tried checking manually for beginners

I can’t believe it took you so long to diagnose that fault?. I just moved the timeline and bingo. 😂 well done and ta for the great vids.

muchas gracias por la esplicacion

Looks like even Dynabook Toshiba got a case of the Mondays with this repair!

Channel P still outputs voltage if voltage on gate is zero. Because it needs less voltage on gate compare to source so technically zero is still less then source. It only cut down voltage if gate voltage is equal or more then source.

Good job mate

NICE VIDEO

Amazing as always. Proper learning video!! Thanks Sorin....

Sorin, on that shorted Mosfet, would you solve the problem with a proper calibrated wire?

wow nice repair boss

Gate with source we have minus and thats not good, 25V@-14V+6V, and 3 mosfet's in serial mode, A1, LOL, Excellent Sorin! Thank You!

WoOoOoOoOoOoW this is it Wondeful repair 👍👍❤

"DC3905" is a terrible choice for SMD marking. Immediately I thought it might be a 1N3905 PNP BJT in a strange package. Then I google suggests LP/LT-3905 DC-DC converter. Only after some more searching, I found out about PDC3905T P-Channel MOSFET. It's silly to choose an SMD marking indicating the same name as existing, incredibly popular, parts.

Hey Sorin, keep going no matter what. Although I noticed you mistaken N-channel and P-channel mosfets pretty often over 6 year period of your videos. No offence. All I learned about laptops is Thank to you. Informative video about N-channel and P-channel mosfets, how to identify them in circuits , whether they are basically a wire OR they are conductive only in one way as long as there is a diode inside mosfet, would be helpfull and resolve this foggy topic once for all. Wish you all the best.

Also at 13.11 when probing bq chip you push some solder from pin 6 to 5, at 13.41 it is visible (possible short) , but after you replaced the third mosfet, probably because of the heat, that solder from pin 6 to 5 is not anymore, check at 31.37 time

Now customer may stack all those batteries in parallel to get more Wh :)

3rd mosfet wauuuu. Next time they'll put a zenner diode on the 3rd mosfet just to play games with us :D

Hi Sorin, what seems useless for you might be useful for us. My experience; when I post a video witch seems not very instructive for me, actually it goes viral and I'm getting lot of comments on it. Keep in mind; you're on one side of a "current sensor" and we are on the other side. We're not charing the same point of view. Cheers

Manufacturers make diferent special combinations.....3xmosfets etc

The Quickest way to check if Mosfet is N or P Channel is by looking at the last number of part number, if its Even number then its N-channel and if its Odd number then its P-channel mosfet eg. 4460 is N-channel 4467 is P-channel. Hope it helps someone out there

Hi Boss!

Someone definitely put a dark spell on this laptop 🧙‍♂️ And actually you received a warning - check marking on the coil of the charging circuit on 4:08 😅

Was acting like sorin and checking voltages across ground and fuses. Heard tick! lol! and I think something burned. Now laptop screen has no backlight.

Sorin, mosfet with 2, 4, 6, 8 termination is n-channel and mosfet with 3, 5, 7, 9 termination is p-channel

Hi sorin... you're need to checking main power for your scope......maybe a bad capacitor.....

Next one with 4 mosfets...🤦😄

Sorin, just an idea, when i saw it pulled 3 amps when pluggin in what if you used the heatcam to detect ? To see what draw that current.

What volatage should we see on the gate of p channel mosfet of the input circuit?

❤

why to buy 4 more batteries ? 1 is not enough to check out ?

Nice Video again, but why should the MOSFETs have 25V on the gate, eventhough the supplyvoltage is only 19,5V?

Hi, Sorin! Isn`t the third mosfet just a BATFET, which is closed when AC adapter is pluged in and opens when working from battery?

Hello just wondering if you could explain the code printed on the bq chip, the one you removed it BQ 24780S CRF1 whereas the new one you soldered is actually BQ 24780S T1 261 A0ZG.

Hi Sorin there is always three mosfet the one was shorted was batery to sys mosfet. You have always 5 mosfets high, low side , bat to sys mosfet , first and second mosfet. But i do not understand mostly bq 24780s is worjing with n channel mosfets and here P channel mosfet.

33:53 - Never connect something while there is power on the board. Disconnect charger, shut down board, then disconnect battery and connect other things. This one move, could make your day a lot worse.

The Dynorod laptops arent the same as when Toshiba used to make the Satellite and Satellite Pro lapops - got a lot of them at work and they're quite slow and clunky despite being branded as the Pro range but costing less than £200 so not really a Pro at all.

the motherboard should have a label in big red letters this motherboard uses 3 mosfets HA! i know general electrical and electronics .. I can read schematics and do basic diagnosis... I think if i watch enough of these videos i might actually understand how to do board level repairs.. probably not... but thats what I think.. hehehe thanks for the video

I am at 2:25 and I am guessing its first and second mosfet issue.

So that MOSFET is in serial mode on the main power rail. Why not just bypass it or replace with a proper calibrated wire?

I have the same notebook...on the power connector I have 2.63v and not 19.5v....I tried two power supplies. What could it be?

that ram looks unusual 😅

RIP MICROSCOPE...

High security + not many car in car park + lots & lots of cooling = Data centre

16:18 chat he live repaires stuff ??! where on twitch,?

The chip replaced was important to stop your wrong path.

Actually it is not unique, it is because you like to work without schematics 😅. It is the mosfet that regulates the work from battery whan charger unpluged so that the voltage from battery becomes main power line. It is being made like that for at least 15 years 😅

Nice one, but please be gentle with the customers data. Never connect SSD on a hot system!

but why was he not seen on the thermal camera?

What kind of Ram memory is that??

If is the odd number is channel P MOSFET else is a N channel

Hi everyone! Laptop hinges broke, and I used shoe glue. Now the screen is quarter black, quarter grey with lines and half working fine. Anybody have an idea why? The glue was clear and had a strong odor, it took some color of the plastic cover and became blue.

Only 850mA ??

we all getting older

You're never going to check for something that you don't know exists, ie, 3rd MOSFET - lol -.

Chill out a bit go sea.

I don't like to hear that sound from your mouth.