The DRMOS, which is an MP8694, has a protection mechanism built in. If there is an over current greater than 200ns or an over temperature is reported between the main PWM IC and the 8694 DRMOS, the DRMOS will turn off the HSFET immediately and the FAULT pin (24) is pulled low. The DRMOS essentially shuts itself down and takes one for the team thus saving the CPU. You can check Pin 17 (PWM) on the 8694 DRMOS to see what fault occurred based on the resistance of either the PWM pin to AGND or PWM to VDD. I've worked on a Razer laptop before that had this exact same chip shorted. It was visibly cracked in half, but I was able to take it out (didn't weld itself amazingly). After I replaced it, the laptop worked just like new. Any laptop that has these Driver Mosfets in the VCORE design is well worth your money because it has a way better chance of saving the CPU in the event that a fault occurs.
Didn't we see the same video? The output of the DRMOS was shorted, the injected voltage was heating up the cpu. A DRMOS can fail and short but without shorting the output, but it wasn't the case here.
@@TheResoluteHawk Exactly we have seen the same behaviour from DrMos taking the hit to protect the rest of the laptop. I noticed that the date on the UEFI showed 3/24/24 which is a strange date to show.
I have had a laptop in with a high side short on the GPU's VRAM rail (FBVDD), so 19V straight to the GPU + VRAMs. It had MP8694 powerstages as well. The GPU was alive! A high side short is usually the end for the GPU. These little MPS powerstages are just amazing and i really love them. I value every laptop that has them.
Never Ever think a CPU is dead because you have a shorted mosfet, especially a drmos, as these can be shorted to ground without shorting to the output, can be just the inbuilt driver.
I agree based on the fact that four ohms is not necessarily a short, just low resistance, It is hard to see because of the glare on the thermal camera, but at time 05:12 you can see a faint glow coming from the mos/drmos he removed when you compare it to the others...
I remember seeing another video about particular DrMos used by Dell on this channel, in that case it had saved the GPU, this video is over 6 months old (it was sent as a preview for subscribers) so it could be older than the video in which Sorin discovers the existence of that particular type of DrMOS. Unfortunately, because of the cuts, it was not clear how the SSD issue was solved
Yes I remember it too. Couldn't find at first but with your info I could find it. youtube id kAThTFapfpE he said that board is similar to alienware. and that dell board and this alienware board look same.
Crazy indeed! I doubt the manufacturer would even be interested in miracle solutions against shorted mosfets. Maybe charger was not plugged in when laptop died? like the other comment said. Anyway this is a very lucky customer, that laptop is mad expensive.
Great fix Sorin. This had me wondering why don't manufacturers fit a small fuse just after/before the VRM's so if something was to fail and send full current and voltage the fuse would blow possibly protecting the CPU/GPU/Chipset. Would have to be blow quick but might help. Or I could be totally incorrect and it's not possible or not suitable to place fuse after/before VRM's.
well, is not really point fitting a fuse, the fuse will blowup based on the current, but the cpu/gpu will be burned by high voltage, so in he moment the fuse blow up, the cpu/gpu is already dead
@@crawfordpritchard9604 There is also overvoltage protection tricks, but it will increase production cost for milions on larger scale. Electronics are produced to work in normal conditions, if abnormal condition appears, thats it, very few almost no protections. Just imagine, if no laptop get broken because it has so powerful self protection and last for 30 years without repairs? People would get their own laptop or two, then never ever buy another one. This is civilian consumer electronics which are almost like a toys... check some videos about mil spec electronics, thats where the real electronics is...
We have to expect the manufacturer _does not care_ about failures outside of warranty. They would rather you buy a new machine than fix it, and even if the customer chooses another brand the manufacturer has really not lost anything. Warranty service is probably handled by board replacement. This would be shipped to an authorized service center where they are not going to muck around with board-level repairs involving time, skill, and the possibility of introducing unknown variables to the product. The latter they care about during the warranty period only-the moment that has passed, let it burn. For those reasons there is no benefit to the manufacturer in adding protections to circuits, only costs. As long as the product limps over the finish line as cheaply as possible, their job is done and they wash their hands of that dirty piece of junk you bought 366 days ago.
the proper functioning of the computer depends on the forced use of the CPU it may display blue screens in the future, if this is the case on Dell PCs you could reduce the cores in use one part one and test until the blue screen disappears and it's a very good thing that dell offers this option in its bios
There is always an inductor between cpu and mosfet, so voltage on the cpu can't rise istantly because the inductor oppose the change in current. This means that if you disconnect the power very quickly, cpu can be protected.
That was the first thing I noticed on that board. The inductors are MASSIVE compared to what you normally see. Also, this is a members only video that got released to the plebs. See comments that are 6 months old+
@@hmartinlb I became a member to give something back and help Sorin out for what is really an electronics course with theory and practical real-world examples, best channel for electronics on utube. Most vids don't take this long to come to non-members, but I don't mind if same day tbh as long Sorin keeps going for us all. Very lucky outcome with this laptop and really enjoyed watching this repair.
The customer said it powered off normally the day before but did not powered on. Probably the mosfet failed at the power up instead of the classic full power in-game disaster.
Good job Sorin and lucky customer that probably work on battery and save CPU, but oem in this kinds of pc must put a protection...this are so expencive that they must protect their Reputation and customer that give them so much money.... But as teach me the professor in enginering study the only law that drive worls is the God MONEY.... bye Francesco Timpano from Florence Italy
CPU or GPU Ok after having a shorted Vcore drmos is possible, thanks to the recent mosfet overcurrent, overheating designing implementation called, catastrophic failure condition, where the low side mosfet gets inoperable when it detects hight side mosfet getting into short, cutting the power output. Good repair from Sorin!!!
Four ohms is not a short, It is just low resistance. I am sure the CPU has lower resistance. You can find four/low ohms to ground in other places on a board and it does not mean the board is bad/shorted. The key is understanding how the circuit you are working on operates. To me the thermal camera did not show the CPU shorted, just operating. It is hard to see because of the glare on the thermal camera, but at time 05:12 you can see a faint glow coming from the mos/drmos he removed when you compare it to the others...
i fixed the same fault and the same mosfet on same laptop last week. it seems those ryzen CPUs are quite resistant in comparison to intel CPUs. reminds me of those old pentium CPUs that can take 12volts easily
Great fix. Nice to see a success story with one of these gaming laptops. Would it be worth replacing all 6 of the chips to be safe? I think I'd want to do that if I was the customer, as he might not get so lucky twice in a row.
Probably slightly warmer on the thermal cam and a bit of guessing. The middle mosfets are always under more thermal stress since they are surrounded by other mosfets getting warm too.
is it possible that mosfet died while laptop was on battery ? If so would bq chip enable charging circuit and push current on main rail if charger was plugged after mosfet getting fried (on battery power)
12:21 - Correct, this is too powerful to ignore missing component. Dont be so surprised, you havent checked schematics in detail, electronics evolve. But its not the first time, I think its the second time on this channel, but 1st was long time ago, but I remember it. I think it has to do with HI and LOW side... if LOW side is shorted then its dead, if HI side is shorted then CPU can survive, something like that...
Easy way to check CPU mosfet.... Before inject voltage short coil output to groung, then you can use more ampere :D that will be better termovision efect :D
Thank you Sorin , congratulations ! Could you tell me which laptop would be the best for Windows 11 since they tell me that my PC does not have the minimum system requirements to run Windows 11? What do you advise me? Thanks
You said that you haven't met a good processor after DRMOS was burned. I remember that you have fixed a gaming laptop (Acer probably?) and then you said that the processor did not burn because DRMOS has a protection that, when something is wrong, opens the low side MOS shorting to groud the main power rail and that protects the processor.
When you know you have B+ shorted to the cpu, why not connect ground to one of the cpu coils? No risk in putting too much power into the cpu, and no distractions from a heating cpu either
They do share circuit function. But removing one DrMosfet will increase the load to all remaining DrMos. They will fail in no time. So it should be replaced.
I bought 1 Alienware when I was selling laptops, what a piece of garbage, I fixed it, gave it to my business partner and told him I was tired of looking at it. He sold it and the kid rolled out of bed and smashed the screen. And I fixed it yet again, yikes.
Amazing, nice fix, one lucky customer!
The DRMOS, which is an MP8694, has a protection mechanism built in. If there is an over current greater than 200ns or an over temperature is reported between the main PWM IC and the 8694 DRMOS, the DRMOS will turn off the HSFET immediately and the FAULT pin (24) is pulled low. The DRMOS essentially shuts itself down and takes one for the team thus saving the CPU.
You can check Pin 17 (PWM) on the 8694 DRMOS to see what fault occurred based on the resistance of either the PWM pin to AGND or PWM to VDD.
I've worked on a Razer laptop before that had this exact same chip shorted. It was visibly cracked in half, but I was able to take it out (didn't weld itself amazingly). After I replaced it, the laptop worked just like new. Any laptop that has these Driver Mosfets in the VCORE design is well worth your money because it has a way better chance of saving the CPU in the event that a fault occurs.
Didn't we see the same video? The output of the DRMOS was shorted, the injected voltage was heating up the cpu. A DRMOS can fail and short but without shorting the output, but it wasn't the case here.
@@nikkopt yeah he did a video on a Dell G15 that has the same DRMOS.
yeah exactly. This is why GPUs can also survive, DRMOS will shut itself down and send fault signal back to PMIC.
Not working every time though.
@@TheResoluteHawk Exactly we have seen the same behaviour from DrMos taking the hit to protect the rest of the laptop. I noticed that the date on the UEFI showed 3/24/24 which is a strange date to show.
I have had a laptop in with a high side short on the GPU's VRAM rail (FBVDD), so 19V straight to the GPU + VRAMs. It had MP8694 powerstages as well. The GPU was alive! A high side short is usually the end for the GPU. These little MPS powerstages are just amazing and i really love them. I value every laptop that has them.
Danke!
Never Ever think a CPU is dead because you have a shorted mosfet, especially a drmos, as these can be shorted to ground without shorting to the output, can be just the inbuilt driver.
but why doesn't DMOS get hot? Instead cpu was heating.
It has a shorted output in the case here, the CPU is getting warm
@@c1q3 On AMD show like heating cpu-aka dead , have seen simular on AMD cpu. Maybe kill Intel in 99%, AMD have more luck.
I agree based on the fact that four ohms is not necessarily a short, just low resistance, It is hard to see because of the glare on the thermal camera, but at time 05:12 you can see a faint glow coming from the mos/drmos he removed when you compare it to the others...
4 ohms would mean the cpu would take up to 5V.... possible to survive, but not likely. Worth checking for the chance
I remember seeing another video about particular DrMos used by Dell on this channel, in that case it had saved the GPU, this video is over 6 months old (it was sent as a preview for subscribers) so it could be older than the video in which Sorin discovers the existence of that particular type of DrMOS.
Unfortunately, because of the cuts, it was not clear how the SSD issue was solved
Yes I remember it too. Couldn't find at first but with your info I could find it. youtube id kAThTFapfpE he said that board is similar to alienware. and that dell board and this alienware board look same.
Love the way you are crazy, You are very good at your work. Well done, please keep going
Good job Sorin, but the question is how did you choose to take of that specific mosfet !! it's crazy like you say !!
Yes, please tell us. Did you develop mosfet telepathy?
Crazy indeed!
I doubt the manufacturer would even be interested in miracle solutions against shorted mosfets.
Maybe charger was not plugged in when laptop died? like the other comment said.
Anyway this is a very lucky customer, that laptop is mad expensive.
Great fix Sorin. This had me wondering why don't manufacturers fit a small fuse just after/before the VRM's so if something was to fail and send full current and voltage the fuse would blow possibly protecting the CPU/GPU/Chipset. Would have to be blow quick but might help. Or I could be totally incorrect and it's not possible or not suitable to place fuse after/before VRM's.
well, is not really point fitting a fuse, the fuse will blowup based on the current, but the cpu/gpu will be burned by high voltage, so in he moment the fuse blow up, the cpu/gpu is already dead
@@electronicsrepairschool Thanks for the reply sorin and cleared that up perfectly
@@crawfordpritchard9604 There is also overvoltage protection tricks, but it will increase production cost for milions on larger scale. Electronics are produced to work in normal conditions, if abnormal condition appears, thats it, very few almost no protections.
Just imagine, if no laptop get broken because it has so powerful self protection and last for 30 years without repairs? People would get their own laptop or two, then never ever buy another one.
This is civilian consumer electronics which are almost like a toys... check some videos about mil spec electronics, thats where the real electronics is...
We have to expect the manufacturer _does not care_ about failures outside of warranty. They would rather you buy a new machine than fix it, and even if the customer chooses another brand the manufacturer has really not lost anything.
Warranty service is probably handled by board replacement. This would be shipped to an authorized service center where they are not going to muck around with board-level repairs involving time, skill, and the possibility of introducing unknown variables to the product. The latter they care about during the warranty period only-the moment that has passed, let it burn.
For those reasons there is no benefit to the manufacturer in adding protections to circuits, only costs. As long as the product limps over the finish line as cheaply as possible, their job is done and they wash their hands of that dirty piece of junk you bought 366 days ago.
@@orion310591RS Yeah I am glad things break so we get to fix things. Going to check out some Mil spec things as you got my interest going now..
the proper functioning of the computer depends on the forced use of the CPU it may display blue screens in the future, if this is the case on Dell PCs you could reduce the cores in use one part one and test until the blue screen disappears and it's a very good thing that dell offers this option in its bios
There is always an inductor between cpu and mosfet, so voltage on the cpu can't rise istantly because the inductor oppose the change in current. This means that if you disconnect the power very quickly, cpu can be protected.
That was the first thing I noticed on that board. The inductors are MASSIVE compared to what you normally see. Also, this is a members only video that got released to the plebs. See comments that are 6 months old+
@@hmartinlb I became a member to give something back and help Sorin out for what is really an electronics course with theory and practical real-world examples, best channel for electronics on utube. Most vids don't take this long to come to non-members, but I don't mind if same day tbh as long Sorin keeps going for us all. Very lucky outcome with this laptop and really enjoyed watching this repair.
The customer said it powered off normally the day before but did not powered on. Probably the mosfet failed at the power up instead of the classic full power in-game disaster.
Nice work, how did you identify which one it was? on a hunch or by seeing that one going bad on others ? I´m curious 😁
I’m curious as well
@@netrosolutions probably saw it on the cam, slight variation in color
@@SirasPK thanks I will check again
Comúnmente es el que se mosfet que muere
Sorin, how did you identify the bad driver? It is not visible on the IR camera for us viewers.
It wasn't a localised hotspot on the CPU, ie, it was all yellow like it was running, so I kind-of new it was still good.
Good job Sorin and lucky customer that probably work on battery and save CPU, but oem in this kinds of pc must put a protection...this are so expencive that they must protect their Reputation and customer that give them so much money.... But as teach me the professor in enginering study the only law that drive worls is the God MONEY.... bye Francesco Timpano from Florence Italy
CPU or GPU Ok after having a shorted Vcore drmos is possible, thanks to the recent mosfet overcurrent, overheating designing implementation called, catastrophic failure condition, where the low side mosfet gets inoperable when it detects hight side mosfet getting into short, cutting the power output. Good repair from Sorin!!!
Good job mate 👏
Four ohms is not a short, It is just low resistance. I am sure the CPU has lower resistance. You can find four/low ohms to ground in other places on a board and it does not mean the board is bad/shorted. The key is understanding how the circuit you are working on operates. To me the thermal camera did not show the CPU shorted, just operating. It is hard to see because of the glare on the thermal camera, but at time 05:12 you can see a faint glow coming from the mos/drmos he removed when you compare it to the others...
these MPS drmos from monolithicpower are used on desktop gpu (rtx 3xxx and 4xxx) as well....they can save the core
Alex in Northridge fix always changes these MOSFETs commonly shorts
Not high side mosfets, this was extremely lucky.
i fixed the same fault and the same mosfet on same laptop last week. it seems those ryzen CPUs are quite resistant in comparison to intel CPUs. reminds me of those old pentium CPUs that can take 12volts easily
I think that the other DRMOS are pulling down voltage. As they are many that results is some unintentional level of protection.
Very possible, as every drmos has feedback line from the output
Did you install a new power-driver? I did only see that you removed the defective one...
Curious that you find the PU12 driver without a sign from the thermal imaging camera."
Hi Sorin, great content as usual. Any idea what that anime/manga wallpaper is or where i can get a copy. its on your drive is at 11.46. Thanks
One of the best repair channels...main welcome card? ...""that,s crazy"" hahah very good.
Great fix. Nice to see a success story with one of these gaming laptops. Would it be worth replacing all 6 of the chips to be safe? I think I'd want to do that if I was the customer, as he might not get so lucky twice in a row.
Those mosfets cost money and sorins time. Just replace what broke and move on.
How did you manage to find the dead driver?
In the video, there is no difference on the thermal picture.
I‘m curious too. I think at 5:10 we can see a spot a tiny bit warmer. (showing at top-left of the center cursor)
Probably slightly warmer on the thermal cam and a bit of guessing. The middle mosfets are always under more thermal stress since they are surrounded by other mosfets getting warm too.
monolithicpower Mosfet They are really a work of art and prevent the processor from burning.
Maybe the charger detected short and quickly cut the power ? Client did say he shut down laptop and never came back on
Sorin your very knowledgeable and going to do a proper repair this time and replace the chip lol
I thought sorin would not replace the mosfet as he does for Dodgy capacitors
is it possible that mosfet died while laptop was on battery ? If so would bq chip enable charging circuit and push current on main rail if charger was plugged after mosfet getting fried (on battery power)
very possible
12:21 - Correct, this is too powerful to ignore missing component. Dont be so surprised, you havent checked schematics in detail, electronics evolve. But its not the first time, I think its the second time on this channel, but 1st was long time ago, but I remember it. I think it has to do with HI and LOW side... if LOW side is shorted then its dead, if HI side is shorted then CPU can survive, something like that...
LOW side is shorted then its dead , No it is vice versa
why don't you give the voltage to the inductor but on the capacitor instead?
You already had one case like that
It was only once and it was because the customer used the battery without the charger when the laptop died
Hi Sorin. What’s the issue with this expensive laptops, they got shorted all the time.
Easy way to check CPU mosfet.... Before inject voltage short coil output to groung, then you can use more ampere :D that will be better termovision efect :D
hmm wouldn't the wire or the tool you're using get hot when you do that?
I think very new laptop added a protection layer for cpu and gpu
Thank you Sorin , congratulations ! Could you tell me which laptop would be the best for Windows 11 since they tell me that my PC does not have the minimum system requirements to run Windows 11? What do you advise me? Thanks
you can install win 11 even if you are getting that message, just install a fresh win 11 from a bootable usb stick
@@electronicsrepairschool Thank you Sorin! I love you very much !
@@transformateur9969you can get the OG win11 and use rufus to burn it on a usb
You said that you haven't met a good processor after DRMOS was burned.
I remember that you have fixed a gaming laptop (Acer probably?) and then you said that the processor did not burn because DRMOS has a protection that, when something is wrong, opens the low side MOS shorting to groud the main power rail and that protects the processor.
SIR, can you cover Lenovo Loq 2024 motherboard dead issue? 🥲
Could you risk "gaming" on it again or just light work?
Need to be install OS, in the harddisk os is corrupted
Happy everyone😉
How did you know it was that mosfet before you removed it?
When you know you have B+ shorted to the cpu, why not connect ground to one of the cpu coils? No risk in putting too much power into the cpu, and no distractions from a heating cpu either
Hi Sorin from Sydney Australia. Do you think both MOSFETs are identical and share the circuit function?
🌏🇦🇺
They do share circuit function. But removing one DrMosfet will increase the load to all remaining DrMos. They will fail in no time. So it should be replaced.
Maybe the operating system is on cloud and because of that the 1st boot option was network.
What's with the weaboo desktop background?
Hi Sorin please can you share the IC model ??
mp8694
*No mosfet, no problem :)*
Does the graphic card works properly?
Can't see why not, the drmos was from the cpu, not the gpu
good day send program for video edit
2 of my friends bought it, and both became useless in 1 year of use. 1 is now a printing pc as the gpu is pretty much dead, only using igpu.
The worst brant to fix. They were better when Clevo made them, same time I had Alienware Engineer Training in Ireland HQ
Is it possible the mosfet was shorted on the low side?
it is possible, but the high side also had problem since the cpu got hot under thermal camera.
@@orange11squaresgood point
Magician
for expensive laptop - 2 pizza
"That's crazy".
The mosfet or driver blew a certain way which saved the CPU. Easy pizza can't believe
Modern components are pretty good for safety.
Perfect❤❤
Proper lucky coustomer 😂
I bought 1 Alienware when I was selling laptops, what a piece of garbage, I fixed it, gave it to my business partner and told him I was tired of looking at it. He sold it and the kid rolled out of bed and smashed the screen. And I fixed it yet again, yikes.
lucky customer!
Maybe the CPU can still be okay because the laptop was shorted when running on battery power.
This is not fixing laptop without 1 phase cpu 😢
You must install this dr mos.
can be another generation of mosfet
That’s why it is called Alienware👽
For my experience, 50% of those impacted CPUs survive.
its wooooooorking crazzzyyyyyyy
always is one of the middle
It's AMD 😉
4 pizza for that expensive loptop 🎉🎉🎉🎉
hı sorın kıng fıx laptop🎉
A dead gaming laptop is never a good start!
4 ohm is normal for AMD CPU
AMD. if that was intel it would be 100% dead.
saved expensive laptop
Easy pizza!
Alienpizza!
Hello🤝masterpiece✌👍👍👍👍👏👏👏👏👏👋👋👋👋👋👋
Why that "???" shit?
Will die in around a week