Excellent repair and a long one means more fault finding and we get see your thought process as if we are with you looking at the board. I already have a background in laptop repair from 20 years of it but watching your videos has taught more than those years from all the videos you have done over past few years. Thank you Sorin 👍👍
Fatigue voice "we have picture !" Congratulations Sorin 🎉. It's a very tough analysis motherboard job. You deserve a Nobel prize for finding the bad resistor 😊. Just to share. Last month, I got exactly same fault. Main power rail 3-4V. No short Acdet 2.6v Regn 6v. Change ic not working. Then, I tried increase the acdet from 2.6v to 3.3v. And suddenly 25v appear on the MOSFET gate. Charging and can work perfectly. Although I'm pretty sure it doesn't make sense. But I'm happy it works 😊
I just discovered your channel the other day because I was given a bunch of broken laptops and researching how to repair motherboards. I've watched at least a dozen of your videos and subscribed. Thank you for your content and education.
I dont know how did you manage to find out what is going on there but you are the real MVP here .... btw that was the saddest "we have a picture" Ive ever heard from you. You sir deserve a fine coffee after this repair
I don't know how no one noticed the 10 ohm resistor that burned when sorin touched the pins of the BQ chip with tweezers... 7:58 (because the laptop was live) and you can see the resistor breaking, later under a microscope while changing mosfet, you can also see the burned resistor, and he didn't notice it until the end of the video
very nice lesson thank you so much Sir Sorin. I've opened my own repairing shop and things are going very well. I've learned much from all of your videos and i always follow every video you post am so grateful to have you Sir you're the best teacher ever. thank you for being so patient with me and others when i used to ask some questions and you would respond. I pray for more Years and health
Wish I did this, 43 now so maybe too late in life but If I ever get early redundancy and a nice pay-out from my current job I will 100% go for it. The boards I cannot fix...well I know this guy on TH-cam, think his name is Sorin 👍👍😊😊
Negative multimeter probe looking tired lol. I bought a Proster Multimeter Leads kit from Amazon over a year ago and I highly recommend it. 0 ohms resistance and many useful add-ons.
Sorin, I know that you prefer linear power supplies but I recently bought an OWON SPE6103 as it provides a graphical display of voltage and current in real time. I was working on a unit that was pulsing it’s power in a similar manner to this HP laptop and this could clearly be seen on the SPE6103 display current plot. They were very short current pulses that could otherwise be missed. I own a few different bench power supplies but the graphical display of voltage and current over a period of 60 seconds per trace makes this inexpensive unit very useful indeed.
(2:18 - 2:20) Detachable GPU (easy access). (4:02 - 4:06) Yeah. Beautiful design. Completely agree. It seems that finally! HP engineers start using their brains...
sir . . plz up load the full video ..we learn how diagnose the bourd i open a shop on my town and i work great >. It's because of you . thank you master
So, if I understood correctly, from the ACDRV PIN on the laptop there's two resistors in series and then two caps in parallel to the mosfets, and on the datasheet there's only 1 resistor. It would have been nice if Sorin measured the resistances of those resistors, maybe the one next to the mosfet was dead.
Great job! I Had similar issue with a laptop a while ago I think that resistor supposed to be a low resistance ( like a fuse) this just my experience though . Thanks Sorin
hello mr sorin can you explain what is done bettween the capacitor and the resistance at pq56 in 30:53 did you remove the resistace and relocate the capacitor thanks for your effort
Of course the resistor wasn't shorted, actually he shorted it to make the laptop work. It may have had an increased resistance, or maybe a smaller resistor (or a short) just helped the laptop to start, even if that resistor was still good.
@@walter.... This fault still took a lot of finding, my question is why that resistor was there and unless it was only a few ohms then shorting it out is likely to cause more issues in the future. This was not the way i was taught to repair faults.
Hi Sorin, great lesson for us with this strange case, thanks for sharing, please whwn explain on datasheet use a mouse pointer bigger & colored if possible or is hard to follow your explenation... thanks 🤗🤗bye Francesco Timpano from Florence Italy
Nice job! Today I had crazy job - 12V power supply, no burn marks, everything clean and intact... but somehow it got 200k 1W resistor to became open! CRAZY! How could that happened? I dont know, its insane!
Great job Sorin this one ir really hard , but I think resistors do not short rather they make open circuit or higher resistance than the actual value respect!
I have an HP X360 Ryzen 5. Insurance write of paid $75 nz plus shipping, Goes well very good laptop sum case damage ect but that is no problem. The problem is if the battery drops below 25% it shuts down or when the charger is connected or disconnected it also shuts down. I am guessing but looks like you have found the issue with the hp charging not charging and intermittent shutdown. Makes sense that if the battery control ic is not seeing the main voltage properly then start up charging and other issues will be present. Thanks for sharing your content.
maybe i'm understanding this wrong, but that resistor seemed to have been pulling the voltage down, so it actually has risen in value instead of being partially shorted? how am i getting this wrong?
In production some times You must make some changes in order to solve uncommon issues. The resistror introduces a delay on the check. May be this motherboard works fine but other not.
Salut Sorine,daca esti de acord sa primesti cadou un DMM Agilent 34401 A,trimite datele de expeditie,platesti transport si taxe. Functioneaza minunat,am facut upgrade si tu mertiti cel mai mult,in opinia mea.Multumesc pentru tot.
I have a repair in right now that’s like this. The laptop starts just fine on battery but shut off in windows. It starts just fine on the charging port but shut off when it gets to windows. The entire laptop is testing fine but I just can’t find the issue.
Hi guys, any idea what air speed and temperature is used for such tiny component like the resistor to take off so fast without knocking out all surrounding components?
@@sakis1991 Thank you Sakis, Ι have the Atten Air Station and anything above 45% air speed it blows off all surrounding small components once the solder starts melting or moves them off the pads
@@emmanuelvalmas5648 i have the same station and you are right usually You want more airflow when you desolder and it depends what you desolder for example if you want to desolder a connector eg hdmi or a shield in mobile phone you can use 60 percent airflow
The HP Z-books also support the Intel embedded GPU, so maybe the screen would have come on with the NVidia GPU removed? Also the zbook G2 and G5 I have owned both support a HP thunderbolt docking station that has both a USB-C and DC plug that are ganged together and perhaps it supports charging also over the USB-C? (in fact I was playing with an Apple compatible thunderbolt docking station and the Zbook5 indicated it was charging without the DC plug). So maybe that resistor is in circuit there to link up to the USB-C input?
@MrBjarnevik I had to use a compatible Thunderbolt cable with the OWC Thunderbolt 3 85W PD dock, a regular USB-C cable didn't have the same effect, but this fiddling around was with a G5 Zbook which is a bit more modern than the G2/G3. Anyway it was just an experiment in case the HP dock with ganged connectors fails.
Hi Sorin. Could you explain what's the theory behind injecting 19Volts on the main power line input? Isn't it suppose to be too risky injecting anything above 1 or 1.5Volts?
Maybe the resistor was going OL instead of short. I mean, maybe, instead of a 200 ohms resistor it was floating around 93,6k ohms. Then the voltage would be the same, but the current reaching the gate would be too low to activate it - I'm not sure if the gate needs any current at all to be activated, though. If it doesn't, what's the point of that resistor?
I’m really confused. You said the resistor was partially shorted, then basically wired the capacitor which totally shorted out where the resistor was. I’m more tempted to think the capacitor is in fact faulty, not passing enough of a power on start up pulse, to the gate (which was also attenuated by the resistor), by shorting the resistor you made that startup pulse higher. If that capacitor continues to slowly fail the laptop will return with the same fault. Unless I have totally misunderstood this fault.
Great repair as always! Just one question: shouldn't the low side mosfet at charging circuit be shorted to ground to discharge the coil? Isn't it normal?
I don't understand even a single thing Sorin is talking about, but it's a damn thriller every time I watch!
Excellent repair and a long one means more fault finding and we get see your thought process as if we are with you looking at the board. I already have a background in laptop repair from 20 years of it but watching your videos has taught more than those years from all the videos you have done over past few years. Thank you Sorin 👍👍
i completely agree with your comment, I am also learning through whatching all his videos
@@fredragir2944 Yeah Sorin is the God father of electronic repair to us all 😊😊
Me too❤
9:25 the best "THAT IS CRAZY" EVER❤
good video as always
Fatigue voice
"we have picture !"
Congratulations Sorin 🎉.
It's a very tough analysis motherboard job.
You deserve a Nobel prize for finding the bad resistor 😊.
Just to share.
Last month, I got exactly same fault.
Main power rail 3-4V.
No short
Acdet 2.6v
Regn 6v.
Change ic not working.
Then, I tried increase the acdet from 2.6v to 3.3v.
And suddenly 25v appear on the MOSFET gate.
Charging and can work perfectly.
Although I'm pretty sure it doesn't make sense.
But I'm happy it works 😊
I just discovered your channel the other day because I was given a bunch of broken laptops and researching how to repair motherboards. I've watched at least a dozen of your videos and subscribed. Thank you for your content and education.
I had the same problem with a customer's laptop! You saved me quite the headache!
Great repair job, Anyone else would have given up this repair. You did great fixing this laptop, but very strange fault.
7:58 ~0.09A for a moment on bq removal - nothing later on - good job, no shaking hands
Hello here from Brazil, your repairs are very good, I'm following your channel.
I dont know how did you manage to find out what is going on there but you are the real MVP here .... btw that was the saddest "we have a picture" Ive ever heard from you. You sir deserve a fine coffee after this repair
😅😅True, the saddest "we have picture"
Sorin, you made "that kind of mistake" for one simple reason, you're human. . . . . . Great work ! 👍
I don't know how no one noticed the 10 ohm resistor that burned when sorin touched the pins of the BQ chip with tweezers... 7:58 (because the laptop was live) and you can see the resistor breaking, later under a microscope while changing mosfet, you can also see the burned resistor, and he didn't notice it until the end of the video
Spot on, it clearly got burned
nothing burned, its rosin
Bought a Zbook after seeing how well they are built. Stunning laptop, gets shit done.
very nice lesson thank you so much Sir Sorin. I've opened my own repairing shop and things are going very well. I've learned much from all of your videos and i always follow every video you post am so grateful to have you Sir you're the best teacher ever. thank you for being so patient with me and others when i used to ask some questions and you would respond. I pray for more Years and health
Wish I did this, 43 now so maybe too late in life but If I ever get early redundancy and a nice pay-out from my current job I will 100% go for it. The boards I cannot fix...well I know this guy on TH-cam, think his name is Sorin 👍👍😊😊
Just WOW....Master Sorin track down 1 faulty resistor in the middle of thousends.
Just the Best!
Finnaly some tough job where u can flex your understanding ! Great job!
Negative multimeter probe looking tired lol. I bought a Proster Multimeter Leads kit from Amazon over a year ago and I highly recommend it. 0 ohms resistance and many useful add-ons.
Thank you, i ordered the Proster one right now, the ones from the video my puppy chew them
Sorin, I know that you prefer linear power supplies but I recently bought an OWON SPE6103 as it provides a graphical display of voltage and current in real time. I was working on a unit that was pulsing it’s power in a similar manner to this HP laptop and this could clearly be seen on the SPE6103 display current plot. They were very short current pulses that could otherwise be missed. I own a few different bench power supplies but the graphical display of voltage and current over a period of 60 seconds per trace makes this inexpensive unit very useful indeed.
Won't it shutdown if it's not linear? And what's the difference between them in your experience
The patience of Jobe and the wisdom of solemn what a star.
(2:18 - 2:20) Detachable GPU (easy access).
(4:02 - 4:06) Yeah. Beautiful design. Completely agree. It seems that finally! HP engineers start using their brains...
Great diagnostic process, unbelievable your knowledge to find the solution, good job.
31:25 I think you mean open. Resistors don't short, they go higher resistance or open.
sorry, indeed
You got there in the end! As always, great to see your fault finding methodology 😎😎
Thank you for sharing this type of hard job :)
sir . . plz up load the full video ..we learn how diagnose the bourd i open a shop on my town and i work great >. It's because of you . thank you master
So, if I understood correctly, from the ACDRV PIN on the laptop there's two resistors in series and then two caps in parallel to the mosfets, and on the datasheet there's only 1 resistor. It would have been nice if Sorin measured the resistances of those resistors, maybe the one next to the mosfet was dead.
This could be the issue of my Thinkpad. Thank you sir. The great Sorin!
I think that resistor has to be 0 ohms. But somehow it become open = no conductivity to capacitor and other track.
Great job!
I Had similar issue with a laptop a while ago I think that resistor supposed to be a low resistance ( like a fuse) this just my experience though .
Thanks Sorin
"Beautiful design" famous last words when dealing with an HP lol
Wow… very nice troubleshooting
hello mr sorin can you explain what is done bettween the capacitor and the resistance at pq56 in 30:53 did you remove the resistace and relocate the capacitor thanks for your effort
Insane fault, very nice video Sorin, thank you!
Thanks Thanks Thanks. I did found a workaround on mine, but now I can fix mine instead :-)
Great video and great teaching!
These sort of faults often make little sense, it is rare for a resistor to go shorted.
as always you got there, well done Sorin.
Of course the resistor wasn't shorted, actually he shorted it to make the laptop work. It may have had an increased resistance, or maybe a smaller resistor (or a short) just helped the laptop to start, even if that resistor was still good.
@@walter.... This fault still took a lot of finding, my question is why that resistor was there
and unless it was only a few ohms then shorting it out is likely to cause more issues in the future.
This was not the way i was taught to repair faults.
Hi Sorin, great lesson for us with this strange case, thanks for sharing, please whwn explain on datasheet use a mouse pointer bigger & colored if possible or is hard to follow your explenation... thanks 🤗🤗bye Francesco Timpano from Florence Italy
Wow Sorin. Really nice repair. Made your brain cells work overtime 😀. I'm learning so much from you. Keep up the excellent work 👍
Hello🤝very interesting case, good job and a great lesson for us, thank you👍👍👍👍👏👏👏👏👏👋👋👋👋👋
Nice job sorin. Thanks.
Excellent repair
Nice job!
Today I had crazy job - 12V power supply, no burn marks, everything clean and intact... but somehow it got 200k 1W resistor to became open! CRAZY! How could that happened? I dont know, its insane!
I have 2 15 g3. Both wouldn't power on. Bought brand new battery and powered on. Haven't had a problem since.
Very good Boris
Nice Work Mr
I like your Pc Background😅😅
مجهود مقدر تحياتي
Great job Sorin this one ir really hard , but I think resistors do not short rather they make open circuit or higher resistance than the actual value respect!
I have an HP X360 Ryzen 5. Insurance write of paid $75 nz plus shipping, Goes well very good laptop sum case damage ect but that is no problem.
The problem is if the battery drops below 25% it shuts down or when the charger is connected or disconnected it also shuts down.
I am guessing but looks like you have found the issue with the hp charging not charging and intermittent shutdown.
Makes sense that if the battery control ic is not seeing the main voltage properly then start up charging and other issues will be present.
Thanks for sharing your content.
I think you can check across the resistor for drop with an oscilloscope
The capacitors start messing with Sorin :) - revange of the capacitors
Mosfet blew because of the charger plugged in when you removed it’s controller (BQ)
Viral quality video in my opinion! Could it be that it was a 0 ohm resistor functioning as a fuse?
maybe i'm understanding this wrong, but that resistor seemed to have been pulling the voltage down, so it actually has risen in value instead of being partially shorted? how am i getting this wrong?
Very nice job!
I would have given up and sent it to you lol. Well done Sorin!
Sorin the legend
I learn every day....
"that is crazy" and the other "lol" :D I am down on the floor laughing :D Anyway Great job as usual!
At 8:50 does he use flux to fit that piece in, or what is it?
Thank you Sorin ! 💪
In production some times You must make some changes in order to solve uncommon issues. The resistror introduces a delay on the check. May be this motherboard works fine but other not.
Salut Sorine,daca esti de acord sa primesti cadou un DMM Agilent 34401 A,trimite datele de expeditie,platesti transport si taxe. Functioneaza minunat,am facut upgrade si tu mertiti cel mai mult,in opinia mea.Multumesc pentru tot.
I have a repair in right now that’s like this. The laptop starts just fine on battery but shut off in windows. It starts just fine on the charging port but shut off when it gets to windows. The entire laptop is testing fine but I just can’t find the issue.
SALUDOS DESDE BOLIVIA AMIGO. USTED REALIZA UN TRABAJO DE ALTO VALOR. QUISIERA PASAR ALGUN CURSO DE USTED MISMO. GRACIAS POR COMPARTIR SU CONOCIMIENTO.
For these must have DSO to capture BQ ACDRIVE volt in microsecond ... In most cases its 1st Mosfet which gets leak due to maximum time switching
Why we connect capacitor between Source & Drain in Mosfet .
This is tough job
Hi guys, any idea what air speed and temperature is used for such tiny component like the resistor to take off so fast without knocking out all surrounding components?
Hi temperature about 400-420 and speed about 30-40 percent, you can go higher or lower it depends how you feel, also the smallest nozzle
@@sakis1991 Thank you Sakis, Ι have the Atten Air Station and anything above 45% air speed it blows off all surrounding small components once the solder starts melting or moves them off the pads
@@emmanuelvalmas5648 i have the same station and you are right usually
You want more airflow when you desolder and it depends what you desolder for example if you want to desolder a connector eg hdmi or a shield in mobile phone you can use 60 percent airflow
Hi Sorin,can you explain the purpose of the BQ Chip,what is it responsible for
i wanted to see the resistence reading of the resistor you removed
The HP Z-books also support the Intel embedded GPU, so maybe the screen would have come on with the NVidia GPU removed? Also the zbook G2 and G5 I have owned both support a HP thunderbolt docking station that has both a USB-C and DC plug that are ganged together and perhaps it supports charging also over the USB-C? (in fact I was playing with an Apple compatible thunderbolt docking station and the Zbook5 indicated it was charging without the DC plug). So maybe that resistor is in circuit there to link up to the USB-C input?
The one ZBook 17 G3 I've got does NOT support USB-C charging.
@MrBjarnevik I had to use a compatible Thunderbolt cable with the OWC Thunderbolt 3 85W PD dock, a regular USB-C cable didn't have the same effect, but this fiddling around was with a G5 Zbook which is a bit more modern than the G2/G3. Anyway it was just an experiment in case the HP dock with ganged connectors fails.
god job i solved my pc ❤
Great, nice job.
WOW..WHAT A NICE LAPTOP!!!! This video should be called "THE REVENGE OF THE RESISTOR"😂😂
Hi Sorin. Could you explain what's the theory behind injecting 19Volts on the main power line input? Isn't it suppose to be too risky injecting anything above 1 or 1.5Volts?
GPU is a MXM 3 SLOT...Very COOL!!!
Resistors must be some kind of famility of capacitors. They started talking to get you 😝
Waw… what the f*** this resistance is supposed to be there ? 🤷🤪 Great job Sorin. Greetings from Belgium.
That's actually CRAZY 😂
Maybe the resistor was going OL instead of short. I mean, maybe, instead of a 200 ohms resistor it was floating around 93,6k ohms. Then the voltage would be the same, but the current reaching the gate would be too low to activate it - I'm not sure if the gate needs any current at all to be activated, though. If it doesn't, what's the point of that resistor?
Master thanks to new lesson
Very good, am still confused though, LOL
I’m really confused. You said the resistor was partially shorted, then basically wired the capacitor which totally shorted out where the resistor was. I’m more tempted to think the capacitor is in fact faulty, not passing enough of a power on start up pulse, to the gate (which was also attenuated by the resistor), by shorting the resistor you made that startup pulse higher. If that capacitor continues to slowly fail the laptop will return with the same fault. Unless I have totally misunderstood this fault.
Sorin can you explain partially shorted resistor????
He meant an increased resistance, not short. Shorting the resistor actually solved the problem.
Good job
9:36 - 7:58 Yes, when you used tweezers
It sounds like it would be better for two fans to run at lower rpm together , because heatsinks look thermally connected..
That resistor should have been 0 ohms and is there to burn out to protect laptop
Useful, thanks
how can I send my HP elitebook 360 1030 G2 from the UK
i have the same issue
very nice!
how to became member?
как всегда великолепно
Great repair as always! Just one question: shouldn't the low side mosfet at charging circuit be shorted to ground to discharge the coil? Isn't it normal?
it is connected to ground but the mosfet should not be shorted otherwise the voltage to battery will always be zero.
@@orange11squares got it, thanks 👍🏻
Hello there
Hi brother, can a computer start with a GPU or CHIPSET removed?
Master 👌
There is always a time in your life when you forget to unplug the charger, always ...
MAESTRO INDEED!! 👌🥂🍾
This small thing making this big issue?