Asus Vivobook N7600P laptop repair - How we are matching mosfets?
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- เผยแพร่เมื่อ 3 มิ.ย. 2024
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sorin You are a brave warrior who cannot be defeated easily💪
I owe you so much Sorin. Grazie
Thank you very much!
A great Video Sorin, Especially the Previous one on finding the shorted mosefet without a thermal camera and any other electronic gadget amazed me and I wonder why you took long years to reveal that knowledge after so many years since you started this youtube channel. thank a lot Sorin for humble thoughts of acknowledging people who are in thrust of knowledge.... Stefan from Sri Lanka on behalf of Channelmart Computers Colombo.
Because master is also better every day and learning like you.
@@5000000000250 thanks for the inspiring comments...
Nice video, glad that you've addressed and explained thermal issues here. Who wants unsatisfied customer back in a week, this time with a dead GPU? It could be that the shorted mosfet was a borderline spec part, used in a "heavy duty" conditions, or simply design flaw. Some laptops work fine in Norway but die while gaming in Sahara. If this laptop was mine I would improvise some kind of heatsink on top of them mosfets.
And what about the cracked resistor ?
Very well explained. Parallel power supplies are very tricky. And very good way of checking in balance
Merci pour ces vidéos toujours très inintéressantes
Sorin makes it look so easy. What a Genious
You are a Star, Sir :)
Thank you very much. Michal
Please make a video with the new mosfet to see the difference on heat!
Thx
I will! I'm curious even my self
Nice Labels on The Board...Great Idea
another great idea. Thank you so much!!
Good job mate 👍
Sorin please you need to add some tape on the multimeter’s speaker 😅😅😉
as always, very usefull video.
also you can replace all 3 of them for the same type , of course you need to choose one with same or better parameters.
Thank you one more time
why you are keep a shorted mosfet , please get rid of them Sorin , thank you for the information you provide pro.
Buenas tardes! Saludos desde San Cristóbal , Venezuela!....excelentes videos que dan gran aporte profesional a las personas como yo que intentamos reparar tarjetas electrónicas de laptops....Dios lo bendiga siempre!.....una pregunta....tengo una laptop Asus similar a esa pero de modelo M7600R, con un procesador AMD Ryzen 9....viendo tu vídeo pues veo que la placa es parecida pero la ubicación del procesador y chip de vídeo parecen estar intercambiados (osea que cambia un poco la distribución de conexiones en la placa )....el equipo al conectar el cargador solo enciende el led como si estuviera encendiendo toda laptop (pero no enciende el led de carga de baterias)....el CPU parece calentar como si trabajara pero no da vídeo y hay un IC MPS2221 que también recalienta (todo lo hace solo al conectar la fuente externa o cargador y sin darle al botón de encendido).....ud me podría ayudar con algunos consejos para su reparación ?...tendrás algún diagrama electrónico o boardview..... gracias....thanks you...
Hi Sorin,
Great job as always👌
I have a question, why don't you start with a visual inspection first while checking the motherboard? Personally while working on a motherboard, I identify approximately 60% of failing components using only a visual inspection.
Regards,
tanks sorin
I'm a beginner, I didn't find any errors (only shorts) during a pc mainboard repair today. when i gave power to the mainboard only the chipset got warm - i assume it is the chipset. Unfortunately I can't fix that.
Is it me or does Sorin add an extra 0 after the decimal point. I could of swore he said 0.07 ohms when in fact the reading was 0.7 ohms
Sorin the other video where a customer had 2 same laptops and both had the same shorted mosfet which killed the CPU. Is it possible on this laptop to replace the mosfets with better ones that can handle more current and voltage so they work less but still perform the same action?
A shorted mosfet I was thinking a dead gpu but it’s a lucky customer. Do you check after you replace a original mosfet and if that one also working harder what do you do?
Those shorted center mosfets need a small sticking finned heat disipater. That would lower it's temperature just enough to match the heat on the two outside mosfets. In fact the factory should do this to lengthen it's life rather than just heat the circuit board.
Amazing👍
hi there great teacher chris here from south africa, can you please share with us which board view do you sir
Salut. Termol padd on thé mosfet?
5:14 looks like the cap was grounded with a tiny wire or it just one single hair probably
FYI, your replaced mosfet did show up a lot brighter on screen. Your viewers saw it very clearly.
What about putting a thermal pad across all the mosfets to help them out
You can't help them because they are helped by the big power rail..
If the MOSFETs get to hot, there can be a problem somewhere because they are not designed to get very hot on the power supply circuit.
@ThermalWorld_ 👍Thanks for the reply
@@ThermalWorld_ My Acer has main heatsink across the mosfets.
When you say working harder, i assume you are referring to its on-resistance?
MOSFETs in parallel are connected with a notion that each device handles the uniform flow of current through it and there is no current concentration during dynamic or steady-state conduction of the devices. However, there are conditions that shatter the current sharing between MOSFETs in parallel.
When there are parameter mismatches, say differences in RDS(on), the MOSFET with the lowest on-state resistance carries the highest current. However, this current imbalance is compensated due to the positive temperature coefficient of RDS(on). As the device carries more current, it heats faster than other parallel MOSFETs and this increases its on-state resistance value. The hike in on-state resistance decreases the current through it and eventually balances the current flow and power dissipation in all the paralleled MOSFETs.
However, this is not the case when the MOSFETS are conducting in the reverse direction through the body diode. The forward voltage of the body diode decreases with a temperature rise and enables more flow of current through it. With time, the current imbalance increases and causes thermal runaway, damaging the MOSFETs in parallel.
@@JonnyMac351 excellent explanation, thanks so much! I remember the thermal runaway with the old fav 2N3055 tranny 😅
👍👍👍👍👍
❤❤❤
11:46 wait it’s a mosfet not soldered in. The gate could be floating. Don’t you have to pull down the gate with the multimeter first to be sure?
great revival laptop
👍🏾👍🏾👍🏾
Somebody should invent an invulnerable mosfet. They'd make $millions.
Hello,i saw 92 celsius in bios?
for a laptop cpu, up to 100C is normal
The mosfet on the right looks like it was already replaced.
well done sorin! however i am wondering that it does seem very odd design choice of the manufacturer here. because they put heatsink over the cpu mosfets well enough. then this mosfet which failed, on the gpu vrm... there is not any top heatsink covered! only through the pcb ground plane is their cooling. so maybe they messed up the thermal design for the gpu vrm is why it failed? then it may die again. those mosfet to overheat another time. for example during gaming. and when the gpu is using a lot more watts than the cpu probably. i suppose it depends also which performance of the gpu. how many watts, the heating. but still!
or maybe because when the gpu gets so hot itself, with too little fan spin. then it dumps too much heat onto the gound plane copper in the pcb next door. and then the vrm gets too hot, because it has no place to dump its heat. stupid things like this. and in a brand new 2022 laptop? perhaps shame on asus for these new design? if this is true or not. that it cannot be fixed, such a design flaw, other than perhaps to run it with faster fan. is much louder / more noisy
but you can at least warn / recommend the customer of those concerns. not to come back to warranty again. onto that existing repair. (and even if you did put the correct mosfet)
if the mosfet has a low Rdson and is switching fast then the cooling through the PCB is adequate. furthermore you have much higher thermal resistance through the plastic body of the mosfet so even if you have a top cooler attached, most of the heat will sink into the PCB anyway.
@@robertjung8929 my friend, i was already aware of those 2 details. however to assume those is all fine... does not adequately explain away well enough the actual cause for this failure to happen... or indeed other similar failures in other laptops such as gaming laptops more generally.
it would make a lot more help to confirm thermals are not a problem here with more effort. and get to the bottom clear answers with some thermocouples placed on the board while to stress test the gpu+cpu
but the sad reality is that too many different models of so many laptops gets released to hit the market. and reviewers dont want to get their hands dirty to bother properly a comprehensive thermals testing including vrm temps.
and even asus themselves ...neither it wants even to do a proper oversight and be responsible for many of their own products. if you watch today's video on gamers nexus (about the asus motherboards blowing up, the lies, over all of the bad firmwares). it is not really much reassurance to be so confident in these products or in the manufacturer. that they were engineered properly
it even can be the hardware is not the final straw to break it. but might be that the software in control of thermals instead has a bug, or the bios / firmware. or the customer is tweaking the fan curve to be too much quiet. and slowing down the fans so much, then it might overheat it a lot.
going back to the failed mosfet itself... could be bad mosfet yes. but then how can be sure. without first eliminating a higher thermals on vrm section. it reminds me of the old alienware laptops. perhaps if the driver has a temperature sensing, is modern smart current stages with proper protection features, ocp, otp.
@@dreamcat4 how do you know how many laptops fail from all the sold ones ? so how do you know there is a real problem ? most probably there is no issue at all with thermals and the amount of failed mosfets you see is just normal.
@@robertjung8929 well it is normal for the manufacturer to want the rma rate to be good enough to get past the warranty period. but therin lies a good question actually. for why was this 2022 model its 12th gen a 3rd party repair and not still covered under warranty? perhaps a used item resold? because we would expect otherwise not to land on sorin's desk
also you are claiming things you do not actually know either. that is the weakest of arguments to make. we can know on some models however with proper review, as i already said enough. so your question is entirely redundant to my last answer. what a troll comment.
Lukcy job Sorin! Nicely done. You should check in an operating system if the gpu is working tho. The bios could be working on the integrarated GPU, the DGPU might still be dead.
@@Kiburici Are you sure? Im preety sure that IGPU handles the internal monitor, while the DGPU handles the external displays. On more premium machines there is a MUX, a chip that switches between GPUs. Although it would make sense for gaming laptops for the laptop screen beeing wired directly to the dGPU for less latency, but the MUX takes care of that. Most machines i have use the IGPU for their internal display. The bios is also a bit SUS since it shows the intel GPU under GPU tab. Just my humble opinion.
@@Kiburici IGPU handles the internal monitor. dGPU can be dead and laptop still power on and load windows
@@Kiburici this is nonsense.
I always assume when you buy an expensive laptop, you'll make sure not to allow water/soda/whatever damage. The problem is people have kids. I bought an expensive laptop and my daughter spilled water on it.
why are there so many shorted mosfets ? why cant they just make a mosfet that doesnt keep failing ? nearly every computer repair channel has the same thing , mosfets
it is very unproffesional and very dodgy when you dont know what amperage and watt of that mosfet and replace with the one that looks the same but different value[ how long it will last the repair]🤤
Relax Karen... If you know so much more than Sorin, why watch his video?
@@jf5016 why not [is good to know the level of others]
He gives warranty for his jobs. If it comes back with the same issue he will not charge anything and fix it the “proper” way for sure.
Edit: 18:18 he even said he will order the correct mosfet…
1st
That does NOT LOOK like a good keyboard to me. It looks like a chicklet keyboard rather than a nice key travel keyboard. Nixt goot.
S is for Sorin…
…S is for SMOOTH!!! 🫡
my 2009 imac has never broken , it has mosfets. are laptop manufacturers just making crap these days , throw away e waste
Did u spill liquid on your laptop as the owner of this laptop apparently did?