11:10 it sounds to me like you perfectly explained what is going on. The there is resistance in shorted mosfet that is higher compared to working one , so there is voltage drop across that mosfet, and bq chip gets lower voltage on the input so amperage is higher to maintain constant charging current on battery. It cuts off when voltage gets to min threshold that bq chip is willing to accept from charger. So as it warms up more and more mosfet resistance climbs and there is bigger and bigger voltage loss on mosfet untill it reaches min voltage for charging and then bq enables undervoltage protection and switches off second mosfet. Do i make sense?
To me that sounds quite right. BQ chip is constantly measuring the input current, I guess, so it can protect the lithium cells and periferal components.
Great explanation on why it's OK to swap out a MOSFET with another one that is not exactly the same, as long as the Voltage and Amperage is OK then it will work etc.
Another great video, informative and educational as always. Perfectionists - please remember this is and engineers' perspective of fault finding and repairing in a cost effective manner while giving the customer what they want. I have learned from this channel that a "proper calibrated wire or 'fuse' " can be a safe repair in the right place 😀😀😀 (But, joking apart - you really do need to know what you are doing...as Sorin obviously does. )
Thank you for this video. I had a laptop with usb-c only charging that doesn’t charge and powers on only from time to time. and could not find the culprit. Was changing bq already because I was measuring strange things around the charging mosfet. Thought of replacing the usb-c management chip. But guess what. The second input mosfet from the usb-c circuit is shorted. Can‘t believe it 😂
Hi Sorin, thank very much for this guide for us SUBSCRIBER, i learn each time a new thing.. thanks for sharing your inestimate experience, It seams to be a common fault and iusse not only with Acer.. make more short video practicle like this for subscriber... a kindly greating.. bye Francesco Timpano from Florence Italy 🤗🤗
Hello Master! Thx always for your lessons. I have 1 question. You did found that first Mosfet shorted which caused the issue, but, a lot of times you use the "proper calibrated fuse" to short the mosfet and bring the board to life. Now i am not understanding why this shorted mosfets is a problem, and on the other tipe of faults, when there is no current flow, you short it manually... My caption is, this time here, was the opposite situation, where the mosfet is always shorted and it should not be? Meanwhile when its always open, you need to short it?
You get them for repair because people can buy them "brand new" not like second hand business class. If a customer has paid ca 1k(+)€ for it, it is valuable to the customer and it will be repaired even the repair costs 250-350€
there is a general rule with repairs.... the more something costs to replace the more it is worth trying to fix it. most likely people buy these dead or faulty laptops, pay to get them fixed and sell them for more than they paid. this is how the world works.... it's normal.
24.5 volt from gate bootstraping because first mosfet n channel at high side gate is float at 18.5 volt (mosfet off) to make its on bq chip must add more 6 volt to make mosfet saturated/turn on. Why its consume more current/power because fault mosfet have more voltage drop from higher resistance compare to normal saturated mosfet and bq chip want to compensate it because power = voltage x current so if voltage drop curret goes up. Why its 18.5 not 19 (other comment before me) there voltage drop from connector and power supply because its use benchpower supply that manually adjust voltage, if we use original charger probably in high current charge will compensate to make output from charger around 20 volt and at notebook you will find 19.5 volt.
Doesn't look as though comments are monitored, but I'd be interested to know why the shorted capacitor 'doesn't matter' and was not replaced. I have to assume it was put there for a reason.
Because short between input and output just means 19V is passing through to the main rail. This is an expected voltage so the BQ doesn't cut off the second mosfet.
@@EsportsTVs MOSFET was partially sorted. So, the voltage gets dropped and BQ chip shuts off the charger. If it's a properly calibrated fuse, full current will flow through it and I don't think the BQ chip will turn out off.
it will still turned off cause BQ will sense the short between source and drain and the laptop will work but battery will not be charging . you can short mosfets with wire in old laptops that doesn't have BQ chips but this not the case anymore with newer laptops @@vkp111
if cap was shorted to ground everything else on this power rail will be shorted to ground and replacing mosfet won't do anything. cap was fine but mosfet had short between drain and source so the BQ chip disabled the battery charging cause it sensed the shorted mosfet . your explanation proof you know nothing about electronics . educate yourself more @@g4z-kb7ct
My laptop acer nitro 5 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
⚠ It's a challenge. They know you're good Sorin so they try to challenge you, just like Bruce Lee, everyone knew how good he was so they all came out of the woodwork to challenge him, but in the end they all lost. 😄
Only gaming laptops because nobody is using laptops for general use and a normal laptop can be found for super cheap. I think soon your gaming laptop repairs will dry up. Time to find something new to do Sorin. How about open coffee shop.
Not using them for general use? Plenty of people with normal jobs and lives use normal laptops, and plenty of people use gaming laptops and will continue to do so. Fiddle with your phone all you want, but don't assume others want to limit themselves that way.
Doesn't look as though comments are monitored, but I'd be interested to know why the shorted capacitor 'doesn't matter' and was not replaced. I have to assume it was put there for a reason.
11:10 it sounds to me like you perfectly explained what is going on. The there is resistance in shorted mosfet that is higher compared to working one , so there is voltage drop across that mosfet, and bq chip gets lower voltage on the input so amperage is higher to maintain constant charging current on battery. It cuts off when voltage gets to min threshold that bq chip is willing to accept from charger. So as it warms up more and more mosfet resistance climbs and there is bigger and bigger voltage loss on mosfet untill it reaches min voltage for charging and then bq enables undervoltage protection and switches off second mosfet. Do i make sense?
To me that sounds quite right. BQ chip is constantly measuring the input current, I guess, so it can protect the lithium cells and periferal components.
very good and very correct you nailed it, thank you.
excellent explanation .. thanks for sharing
Thank you very much for passing on your knowledge Sorin
Monitoring is the best way of pinpointing the fault area
Monitoring current is the best way of pinpointing the fault component
Great explanation on why it's OK to swap out a MOSFET with another one that is not exactly the same, as long as the Voltage and Amperage is OK then it will work etc.
great work as usual. I learn so much.
Its 2 am..still watching your video
Great information. Thanks for sharing alternate ways to repair things.
Another great video, informative and educational as always.
Perfectionists - please remember this is and engineers' perspective of fault finding and repairing in a cost effective manner while giving the customer what they want.
I have learned from this channel that a "proper calibrated wire or 'fuse' " can be a safe repair in the right place 😀😀😀 (But, joking apart - you really do need to know what you are doing...as Sorin obviously does. )
Over 20 on the gate, mosfet works great 👌❤️
Hi from greece Sorin.
Great job.
Mosfet was fine - the S to D short was the capacitor alone - hence the current went to zero as the mosfet was turned off by the over current sensor
Thank you for this video. I had a laptop with usb-c only charging that doesn’t charge and powers on only from time to time. and could not find the culprit. Was changing bq already because I was measuring strange things around the charging mosfet. Thought of replacing the usb-c management chip. But guess what. The second input mosfet from the usb-c circuit is shorted. Can‘t believe it 😂
Thank you for another great video. You are a great teacher Sorin. God bless you.
Thanks Sorin , please do a video about the types of mosfet and how to identify them for some of US the beginner's please
Hi Sorin, thank very much for this guide for us SUBSCRIBER, i learn each time a new thing.. thanks for sharing your inestimate experience, It seams to be a common fault and iusse not only with Acer.. make more short video practicle like this for subscriber... a kindly greating.. bye Francesco Timpano from Florence Italy 🤗🤗
Nice work and tutorial!
Nice work. Thanks for the video.
Hello Master! Thx always for your lessons. I have 1 question. You did found that first Mosfet shorted which caused the issue, but, a lot of times you use the "proper calibrated fuse" to short the mosfet and bring the board to life.
Now i am not understanding why this shorted mosfets is a problem, and on the other tipe of faults, when there is no current flow, you short it manually...
My caption is, this time here, was the opposite situation, where the mosfet is always shorted and it should not be? Meanwhile when its always open, you need to short it?
One of the easiest laptop brands to fix.
Good idea sorin
God, finally i found out why my predator triton always losing power and cannot charging
Hello guys I wanna learn this job any advices like how many time can take to learn and where can take a course or something
8:23 sorry noob question, but what was the use of that liquid? same at 4:12
Hi there I got the 2070Max Q version I need to get a new charger do you know the one I need?
Sir, how can we know N or P channel MOSFET at dead mosfet condition?
You get them for repair because people can buy them "brand new" not like second hand business class. If a customer has paid ca 1k(+)€ for it, it is valuable to the customer and it will be repaired even the repair costs 250-350€
there is a general rule with repairs.... the more something costs to replace the more it is worth trying to fix it. most likely people buy these dead or faulty laptops, pay to get them fixed and sell them for more than they paid. this is how the world works.... it's normal.
24.5 volt from gate bootstraping because first mosfet n channel at high side gate is float at 18.5 volt (mosfet off) to make its on bq chip must add more 6 volt to make mosfet saturated/turn on. Why its consume more current/power because fault mosfet have more voltage drop from higher resistance compare to normal saturated mosfet and bq chip want to compensate it because power = voltage x current so if voltage drop curret goes up. Why its 18.5 not 19 (other comment before me) there voltage drop from connector and power supply because its use benchpower supply that manually adjust voltage, if we use original charger probably in high current charge will compensate to make output from charger around 20 volt and at notebook you will find 19.5 volt.
very good explanation
We didn't have picture :(
Doesn't look as though comments are monitored, but I'd be interested to know why the shorted capacitor 'doesn't matter' and was not replaced. I have to assume it was put there for a reason.
Daily open UA-cam watch your video close UA-cam 😂😂😂
Why do you need a mosfet if the voltage in is the same as out?
Nice one
perfect
Is it possible I just need to swap out my laptop's battery?
If mosfet was short ..how come we had 19v rail..and how laptop was turning on?
Because short between input and output just means 19V is passing through to the main rail. This is an expected voltage so the BQ doesn't cut off the second mosfet.
Can i use proper calibrated fuse insead of MOSFET here?
No you cant the BQ chip will detect it
' proper calibrated fuse = shorted MOSFET ' = you swaped the fault with another same fault
@@EsportsTVs MOSFET was partially sorted. So, the voltage gets dropped and BQ chip shuts off the charger. If it's a properly calibrated fuse, full current will flow through it and I don't think the BQ chip will turn out off.
it will still turned off cause BQ will sense the short between source and drain and the laptop will work but battery will not be charging . you can short mosfets with wire in old laptops that doesn't have BQ chips but this not the case anymore with newer laptops @@vkp111
sorin, 1 question. How can the laptop work fine, with the first fet shorted? why is not shorting the main power rail?
because it wasn't actually shorted. The fault was the cap was shorted. if he had just removed the cap it would have been fixed....
if cap was shorted to ground everything else on this power rail will be shorted to ground and replacing mosfet won't do anything. cap was fine but mosfet had short between drain and source so the BQ chip disabled the battery charging cause it sensed the shorted mosfet . your explanation proof you know nothing about electronics . educate yourself more @@g4z-kb7ct
the mosfet is not shorted to ground, it was just shorted inside , like a switch that doesn't make a proper contact and the light are dim.
Thursday morning ? :)
My laptop acer nitro 5 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
You've probably tried these options already, but .... Sometimes it's the power supply socket that's faulty, or the power supply plug, cord or 'brick'.
⚠ It's a challenge. They know you're good Sorin so they try to challenge you, just like Bruce Lee, everyone knew how good he was so they all came out of the woodwork to challenge him, but in the end they all lost. 😄
ok, but why 18.4 volt? on the power suply is 19.6
yes, that is a bit strange, sorry, i had to look again...maybe the charger is at 18.5V...
we are happy to help the customer not only you sorin hhh i am joking
If it comes in on 3…it’s a Channel P
What did u mean about ' If it comes in on 3 '
?
Pleaseeeees make a video about yourself.
Which book should we read
About your experience?
Hello🤝👍👍👍👍👏👏👏👏👏👋👋👋👋👋
a fault on it blew the capacitor, you removed it, did you replace it? Any future fault will just blow the rest of the laptop up if you didn't?
The capacitor was already blown up and the laptop was working my guy. It's clear that that capacitor represents a failure point and isn't needed
@@occultsoundscapes moronic answer caused by ignorance of the subject
Only gaming laptops because nobody is using laptops for general use and a normal laptop can be found for super cheap. I think soon your gaming laptop repairs will dry up. Time to find something new to do Sorin. How about open coffee shop.
Sorin didn't ask for your 1cent, so please you either learn or you get away from his page
@@cfamozcomputermetropolis7191 enough coffee for you already.
Not using them for general use?
Plenty of people with normal jobs and lives use normal laptops, and plenty of people use gaming laptops and will continue to do so. Fiddle with your phone all you want, but don't assume others want to limit themselves that way.
Doesn't look as though comments are monitored, but I'd be interested to know why the shorted capacitor 'doesn't matter' and was not replaced. I have to assume it was put there for a reason.