Shorted high side mosfet = always a dead CPU or GPU Acer Nitro 5 AN515-55 not coming on or charging
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- Опубликовано: 20 апр 2023
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A simpler method for identifying a shorted MOSFET without removing any component is to connect the coils to the ground. This will cause the faulty component to illuminate under a thermal camera, and it will also protect the CPU/GPU from excessive voltage because it will clamp it to ground. Just a tip.
Smart
I do so,can put more voltage
so like soldering a wire to the ground and to the coil? but what part of the coil? in between mosfet and coil or inbetween coil and cpu/gpu and such?
Could you share any examples of this ( video, etc.)?
I guess the only argument against would be that if you incorrectly identified a low resistance-to-ground inductor as a short, and then fed in amps, you could cause a fault on a good rail. But like most things, experience will help!
Good morning, having my coffee and Sorins morning video is just the perfect start of my day.
Doesn't matter if you didn't fix it Sorin, still great tutorial video. Thank you!
Hi Sorin, you are always good at this job
Thank you so much for this! It is very timely as I have just had the same issue on the same model and thanks to your tutorial I could quickly figure out the laptop is gone before making more costly repair attempts.
I had same laptop with same issue.. was driving me nuts… after I watched this video I was relieved.. thanks Sorin
Eu estou com o mesmo defeito em um LA-K861P. Comprei mosfet novos no aliexpress AON 36352 e ficou no mesmo sintomas que este vídeo tutorial. Obrigado por sua experiência e explicação sobre este equipamento.
Sorin of I was 50 yrs younger I would love to learn the knowledge you have gathered and given to us. And I'm still learning at 70 because you can't stop learning as it is one of my big interests hobby wise. Thank you Sorin
nice morning sorin with coffe and a lesson for you.thanks
good to watch❤
great video Thank you
I’ve got the same kind of laptop, power just shut off all of a sudden and the screen went black, opted for a new power supply still nothing, thank you for this video. You’ve saved me many many hours of heartache
I had the same issue too, laptop didn't even last for 2 years damn shame, the thermals were shit too.
Thank you
nice work
I wish I could still be in uk to send you my alienware r5, I'm pretty sure you could fix my rgb lights as they are not working at all and it's not a single case, great videos by the way!
Bigger fish to fry than mere rgb.
Why after the coil in vcore circuit the manufacturers doesnt put a fuse for this case?
Just had the same issue and on the same mosfet today. I actually plugged the power and saw the main power Moffett getting hot because of that little mosfet was shorted. I removed the little mosfet (same as you in the video), and the power actually went and powered the motherboard for a second only to stop right after. Again, under the thermal, the CPU was lighting up like Christmas. Defintly not worth repairing it. It's better to keep it for parts at this point
I think the manufacturers should do more to protect these bga ICs like cpu and gpu etc from high voltage or these ICs should have sockets.
The high-voltage protection is build-in, but it can not protect against a shorted high-side MOSFET. Then only the overcurrent-protection works. Many CPUs/GPUs survive this impact. A socket is a good idea, I think. But the reliability is not better.
Morning Sorin, early morning post
Just having a coffee :D
Спасибо) очень интересно
4:58 how is the motherboard is shorted to ground and when u plug thee power supply ,itss didn't show it , normally the voltage drop and the current got drawn , someone explain pleasee
It's ridiculous how manufacturers do laptops so powerfull but there's no safeties for this kind of scenario. As always, awesome video 👍
Sorin can u give proper voltage from ur external power supply to the shorted mosfet point to check what happen
Careful when heating near those aluminium capacitors... They can pop with little heat 😢
I have the same laptop. I get 19v on the first mosfet and then 14.6v on all of the following. No short. would that mean that the first mosfet is bad?
No fix but nice video as always!
Hardest part of these cases is giving up. You feel that maybe one more look/test will find something that can be repaired, make the customer happy and get paid full fee!
I just cant remember anymore how much precious time of my life was wasted on AMD and Acer products. Since the 'great' K7 toaster.
You are right. I just tried to repair friends expensive gaming laptop with short in between layers after driver blown (maybe something else as well, it was at pc specialists UK for repair, they unsoldered many parts) 19v rail short and there's simply impossible with Dremel, so many cells and very close each to other 😅
@Arthur how much did somthing like this cost your friend?
pfff.... that's the easiest part....I never went home thinking 'hey, I should've tried this too' or watched maniacally videos on RUclips about finding sorts or kept thinking about it until I slept and ended up having some tech-geometrical themed dream.... never happened...
Hi sorin little bit advice I'm watching always your video, if you remove a upper mosfet or high side mosfet don't plug in a charger without new mosfet, because the source of the upper mosfet is 19v, so they chance to wild that area because no mosfet detected by vcore ic, and is possible the lower mosfet will switch the ground in the cpu inductor
There is no lower mosfet, those are dual mosfets, two mosfets in one package.
@@electronicsrepairschool nice one if dual mosfet, by the way why u not connecting your laptop charger on DC bench to see the ampere what going on
i changed battery and it turned on then it shut down and blue light blinks 5 times, i could not charge. any ideas???
i was exited and waiting for you to saying ( i can't believe it's working) 😂but nah. next time ❤️
I just No-fixed an ACER Predator Helios 300 (Same motherboard shown in the video) with the same exact fault. I started by removing the two input MOSFETS and the 2 resistors. I Injected 1V/3A on left PAD of current sense resistors and found the shorted CPU MOSFET to be the one on the Far right. After removing it the short on the +19V input went away, but sadly measuring 0.3 Ohms to GND on the 4 CPU VCORE phases... :( RIP CPU. The MOSFET at position PQB11 was also shorted. When I looked in the barrel of the charger plug, there were scorch marks, and the charger was not outputting 19V. My guess the charger (aftermarket) may have been the fault.
Last week this case came to me i couldn't fix it 😭. In my case the MOSFET was severely burned and it ate the PCB.
Yer not much can be done in this case. New/used board or replacing cpu and chance of success is like playing the lottery.
How did you know it's a dead high side mosfet from beginning? Can we guess it from charging current before opening the laptop?
good...very good
They could protect it easily. Just disconnect power when some mosfet is not switching. Nothing get burned
Do the VRM fail becouse of heat? i know some people that want to play on a laptop but dont want to have any fan noise, could it be that most of the laptop that comes in are people that sett custom fan curve, or dont want the laptop to make any noise? i remember sorin once said that heat is the nr 1 factor that vrm fails or am i wrong? so playing with full fans on a laptop is not such a bad idea maybe hehe or am i wrong?
Heat is a factor, yes, but it could also be stress, those MOSFETs are switching very fast while dealing with a considerable high current so stress can also be a factor.
The datasheet has info on how much heat the component can tolerate and considering that there is very little ventilation inside a laptop compared to a desktop they have a high likelihood of dying, especially on gaming laptops, more powerful chips means more current, more current means more heat and so on.
In that sense, yeah, lowering the fan speed to lower the noise means more heat so higher likelihood of those components dying.
LEARN STUFF - THINGS I DO- This is a great video to LEARN about things you USE daily and how to repair them.
must be something that is common with acer nitro laptops mine got very hot and died within a couple of weeks of the warranty running out and I've tried all of the things acer said to do its a shame really seeing as it cost me £1000 still i guess i will have to treat myself and build a pc now
My laptop having kind of same problem it is not charging and not turning on
I showed it to a guy and he did some repair and laptop turned on but only for two times and again got same problem as before what should i do
I gave him my laptop 3 times still facing same problem he is unable figure out what is the exact problem
Each time
He done repair laptop turned on but only for 2-3 times then didn’t open
Please reply me what should i do
is not possible to order and replace mobile CPU?
Please do more tutorials on Acer Nitro 5 laptops. I have the same issue with my laptop since last week and I don't know why this laptop is that strange and weak. Sadly my Acer Nitro 5 AN-515-58 does not turn on and does not show any sign of life. I am desperately seeking a way to fix it, and there is no on in Missouri to fix it. All they can do is replace the mainboard with a new one which I also can do it myself but I need to make sure it's a dead laptop.
19.8v @ 1.6ohms = 245w through the CPU right? Such a sad loss, I hated it when intel made the switch to BGA after Haswel era 😞
Not always, I think. I have here an ASUS ROG which had a shorted high-side MOSFET and got 19 volts. It survived because of the working protection in the power supply.
Dear Sir can you change cpu this model?
its ok
They are dual mosfet. With only one you control high and low side. I have same laptop for repair and the mosfet is shorted in high, low side, even the gate is shorted. Mine doesnt show screen also, after short is gone without faulty mosfet, but i can see that mosfet controller measure the sum of the mosfet output rail, and is probably that no screen image by this, another bad possibility is dead cpu, the worst thing, same thing that this video show 😰
The question is what caused the fault. The mosfet blowing the cpu or the cpu causing the most stressed mosfet to short? Up until the last couple of years it was never the cpu especially on desktop boards, now we are seeing a lot more dead cpu's.
That's a good question! Both CPU and Power Mosfet can be the reason. We know that current is high in the circuit. Perhaps Mosfet itself had some defects during production and was overstressed during normal operation. The same is also valid for the CPU. With enough heat and time silicon will fail. We don't know if cooling system was in fully working order. Perhaps this laptop had overheating issues.
The mosfets shorting is a pretty common problem on damaged laptops. We see CPU's in PC's don't really have this issue. I'm guessing the mosfets enclosed in such a small space with poor cooling leads to there failure. I think the CPU failure comes from the mosfet failure.
@@anthonydenn4345 I have few cases whit shorted high side mosfet in desktop mothrboards, but never was the CPU damaged after that. Of course 12V ATX supply was applied directly to them, but survived. Maybe the ATX supply is quicker to disconnect the power than these laptops, don't know.
well, i have seen a lot of coments that acer nitro is a expensive heater...
I just had this happen to my laptop. Was watching this video to learn how to diagnose before deciding next step. I wasn't even pushing my laptop hard or in terrible conditions and it just happened. Laptop wasn't particularly dirty. I'm wondering if maybe poor thermal paste or otherwise is not pulling enough heat. I am not experienced enough to discern unfortunately.
Were the other 2 similar laptops the ones he thought was bios firmware failure - lol -.
Well.. my nitro 5 was up and running fine. Went out side to get my cat inside.. started raining pretty bad. After about 10 minutes. I came back to my laptop powerless.. no lights.. connected to surge protecter.. screen wo t come on. I mean absolutely nothing. Not a single beep. What the heck is going on? I've read post after post about these nitro 5s dieing after a storm.. how can I even fix this?
Sorin , se poate sa iei un CPU de la alt board sa-l pui pe motherboardu tau ? Aia din China cum fac ? Doar intrebam si eu, ca tot ce am invatat e de la tine , acuma stiu si eu sa schimb un super IO datorita tie. Multumesc pentru toate videourile tale.
Sigur ca se poate, dar nu cu statia aia de aer cald si atat si sa mai si mearga.
Sunt convins ca il face si cu statia de aer cald, la ce mana are. Nu renteaza insa. Mai simplu repari placa donoare.
when u injecting voltage, why do u not measure voltage on coils? if high side mosfet is shorted, there should be some voltage, yes?
the coils outputs are connected together to the cpu or gpu ,wouldnt they show the same value?
you can actually come with power supply black prob at the input coils instead of the board ground and red one in 19v output caps to identify the shorted mosfet( gets hot) that way you are 'cancaling' cpu or the load from the circuit.
hmm... i dont know, maybe it's depends on damage level (of cpu/gpu), if it's not too high, then only one line will be shorted? i'm guessing, someone can correct? in that case voltage on (cpu/gpu) coils will be same (or greater than zero) or it's depends?
Why not replace CPU?
My gaming laptop last 2 years and it blew a IC chip. Since it's a build in gpu, cost 1000$ to repair. I'm convinced.... NOT MORE GAMING LAPTOPS! Stick to desktops when you want power. And this guy says 80% of his repairs are laptop boards? Enough evidence that too much power in a tight enclosed case will ALWAYS lead to destruction. We don't see this in tower pc's.
I have 2 questions here? First one is the Mosfet was shorted and caused CPU to fail, is it right? And the second one is, if u had a CPU spare one Exactly same, can u able to replace it and make it work or is the mainboard damaged also and not possible to replace or make it work again?
Cpu removal requires a specific machine that heats the entire board evenly and safely and makes the cpu easier to remove, but most technicians can't afford it because it is very costly and not economical
Neata, cafeaua cand o bem? Maine dimineata?
sir every caps are shorted in one section what can i do??😭😭😭😭
That is supposed to be like that. That's normal
it's a nice laptop, so why not replacing the cpu?
Change CPU?
I miss the good old times when Sorin didn't have a thermal camera and he would have to use his hand. It would sound something like this:
We have a proper nice laptop here. i7, separate graphics, SSD, proper nice. Let's connect it to the power supply. No, no, no.. I can't find anything that's getting hot. No... It can't be a faulty CPU. No.. It will be a sad day if it's a dead CPU because this is a nice laptop. *AJAJAAJAJAJAJAJ* this is mad hot! I burned my finger! It's a hot capacitor! The CPU is fine! 😃
Those videos were suspenseful and interesting until the last second 😂
Hahaa, i understand but the truth is, the thermal camera made my life easier :D
@@electronicsrepairschool yes, I fully understand. It can save you hours of work.
It's a capacitor! I can't believe.
@@OnStageLighting I cant believe, this is crazy
@@martinharmath1566 the customer got lucky. Usually these gaming laptops are tricky.
@9:30 - you did not show how you knew that mosfet was the cause of the shorts!!!
- was it getting hot, like the CPU?
Yes
my laptop is the same model and have same problem D':
"80% of my jobs are gaming laptops" What could be the reason ? It is the fact that gaming laptops are expensive and worth the cost to repair as opposed to a 350 euro laptop which people might prefer to just throw away if it breaks outside warranty than to spend time and money to get it fixed ? Or other reason (like Sorin is getting the harder to repair jobs (which just happen to be gaming laptops with their higher complexity and discrete video card) after normal shops fail to repair them ? Would be interested to know.
Partly because gaming laptops are always pushing the basic laws of physics.
i guess you are kind of right saying that gaming laptops are expensive and buying another one is too expensive, but if you look the adapter of gaming and no-gaming laptops you will see quite the amps difference, from like 2,5 (normal) to 10 (gaming), even 15 amps
I cant believe why no protection against this. ridiculous. On purpose maybe who knows.
Go on, try a CPU change for the funs
Is there way to prevent any consumers from getting this issue ?
dont play any game in your gaming laptop
Yeah. You can avoid buying gaming laptops. They are almost all burning up prematurely. I'm a victim myself. Only lasted 2 years. All my prior TOWER builds NERVER failed. Learned a valuable lesson. 2700$ down the drain
if you want the laptop just for playing, maybe a normal laptop + egpu could be an option, avoid gaming laptops if you are gonna play a lot, better a desktop pc
@@lPlanetarizado I play with my legion 5 pro for 5 hour sometime less with cooling pad and I limit the temps to 86c for cpu
And gpu most of the time is 76c in heavy games
sir i want to become computer technician and i know computer assembling, windows formatting, and all computer works... but i don't know motherboard repairing so please sir give me some advice please🙏🙏I have to get my motherboard repaired from others here and they don't repair anything properly and charges very high
My advice is to watch all Sorins videos, get some broken laptops and start repairing.
Sorin has a lot of videos that can help you get started
Thanks... take a coffee.....
Thank you!
I have never understood why the CPU gets burnt when the MOSFET is shorted. Normally the MOSFET is conducting current, the same as if it is shorted. Even if you get more Amps momentarily, as explained here, what makes the CPU draw more Amps? Is it a question about Volts?
A cpu is not made for a 20v pressure..
If you look at the schematic of the buck circuit that powers IC, it becomes obvious what happens when the high side MOSFET shorts. Full PSU voltage straight to a line made for 0.8v. Current is the result of voltage and resistance.
@@OnStageLighting
Is the MOSFET part of a Voltage regulation? I didn't think there was so much reglation in a MOSFET. Not like a transistor.
@@Drottninggatan2017 the high frequency switching of MOSFETs is the basis of all modern buck or boost voltage regulation circuit designs.
@@OnStageLighting
Okey, tanks.
But then, why can't there be a current limiter or a fuse after the MOSFET?
That should be a inexpensive protection against overcurrent.
So sad, I feel for the owner. Spending so much on a gaming laptop only to watch it fail and unrepairable. 😟
Is it not the case of just replacing the cpu then?
@@tirinsreplacing the cpu, correct! 👍 🎉 but it has to be the same exact cpu or you’ll most likely run into bios troubles or temp problems
This is why i am afraid to buy new laptop.. just stay with my old asus fx553vd
so you will order CPU from China now?
You must be joking, right? :D
@@electronicsrepairschool of course :D
Now what next
Replace motherboard
o come on, replace it with your heatgun!
If it's the cpu dead, then you can replace it . Buy one which is compatible with this modele. Then it's done
Last week I got the same notebook with the same defect, it worked for a week after changing the mosfet until it died for good, that's sad kkkkk
Wait my comment
RAM?
Never buy laptop with soldered unreplaceable cpu
💀 cpu that’s……
Not only will I never buy a gaming laptop, and not only will I never buy a Lenovo laptop. I will never buy another laptop, I don’t like them anyway. Back to mini towers only. from now.
Thats an acer nitro my man 😅
Order a new processor from China
😂 Maybe this Time come better 😁
How did you know it's a dead high side mosfet from beginning? Can we guess it from charging current before opening the laptop?
They are dual mosfet. With only one you control high and low side. I have same laptop for repair and the mosfet is shorted in high, low side, even the gate is shorted. Mine does show screen also, after short is gone without faulty mosfet, but i can see that mosfet controller measure the sum of the mosfet output rail, and is probably that no screen image by this, another bad possibility is dead cpu, the worst thing