HP Zbook 15 g3 no power board repair - a two hours job, a hard one
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- čas přidán 5. 06. 2024
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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❤
I had the same problem with a customer's laptop! You saved me quite the headache!
9:25 the best "THAT IS CRAZY" EVER❤
good video as always
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
Great repair job, Anyone else would have given up this repair. You did great fixing this laptop, but very strange fault.
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 😊
7:58 ~0.09A for a moment on bq removal - nothing later on - good job, no shaking hands
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"
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 CZcams, 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.
Thank you, i ordered the Proster one right now, the ones from the video my puppy chew them
I think that resistor has to be 0 ohms. But somehow it become open = no conductivity to capacitor and other track.
Sorin, you made "that kind of mistake" for one simple reason, you're human. . . . . . Great work ! 👍
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!
The capacitors start messing with Sorin :) - revange of the capacitors
You got there in the end! As always, great to see your fault finding methodology 😎😎
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.
The patience of Jobe and the wisdom of solemn what a star.
Great diagnostic process, unbelievable your knowledge to find the solution, good job.
Bought a Zbook after seeing how well they are built. Stunning laptop, gets shit done.
(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 video and great teaching!
Nice job sorin. Thanks.
Thank you for sharing this type of hard job :)
Thank you Sorin ! 💪
Insane fault, very nice video Sorin, thank you!
Excellent repair
Mosfet blew because of the charger plugged in when you removed it’s controller (BQ)
This could be the issue of my Thinkpad. Thank you sir. The great Sorin!
I learn every day....
Very nice job!
Great, nice job.
I would have given up and sent it to you lol. Well done Sorin!
Hello🤝very interesting case, good job and a great lesson for us, thank you👍👍👍👍👏👏👏👏👏👋👋👋👋👋
Thanks Thanks Thanks. I did found a workaround on mine, but now I can fix mine instead :-)
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
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
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
Useful, thanks
Nice Work Mr
I like your Pc Background😅😅
Good job
Master thanks to new lesson
Wow Sorin. Really nice repair. Made your brain cells work overtime 😀. I'm learning so much from you. Keep up the excellent work 👍
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!
31:25 I think you mean open. Resistors don't short, they go higher resistance or open.
sorry, indeed
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.
Master 👌
very nice!
Resistors must be some kind of famility of capacitors. They started talking to get you 😝
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!
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.
I have 2 15 g3. Both wouldn't power on. Bought brand new battery and powered on. Haven't had a problem since.
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
GPU is a MXM 3 SLOT...Very COOL!!!
WOW..WHAT A NICE LAPTOP!!!! This video should be called "THE REVENGE OF THE RESISTOR"😂😂
Thats crazy! I love it!
I think you can check across the resistor for drop with an oscilloscope
That's actually CRAZY 😂
Very good, am still confused though, LOL
как всегда великолепно
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.
That resistor should have been 0 ohms and is there to burn out to protect laptop
Viral quality video in my opinion! Could it be that it was a 0 ohm resistor functioning as a fuse?
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
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.
Waw… what the f*** this resistance is supposed to be there ? 🤷🤪 Great job Sorin. Greetings from Belgium.
9:36 - 7:58 Yes, when you used tweezers
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
MAESTRO INDEED!! 👌🥂🍾
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 👍🏻
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?
Why we connect capacitor between Source & Drain in Mosfet .
This is tough job
It sounds like it would be better for two fans to run at lower rpm together , because heatsinks look thermally connected..
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 Sorin,can you explain the purpose of the BQ Chip,what is it responsible for
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.
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.
Hello there
Sorin can you explain partially shorted resistor????
He meant an increased resistance, not short. Shorting the resistor actually solved the problem.
👍👍
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?
At 8:50 does he use flux to fit that piece in, or what is it?
👌👌👍👍
Wish all GPUs were like That...Linear power supplies are Pro...
you need a vacancy you look so tired in the latest videos. anyway thank you very much for shared knowledge!
Hi brother, can a computer start with a GPU or CHIPSET removed?
how can I send my HP elitebook 360 1030 G2 from the UK
Wow 4 slote ram😮😮😮
in 2016 , nice
Diablo 4 ..give out your id lets play a couple runs :D
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
it's weird to see a laptop with a removable GPU and 4 RAM slots in 2024 wow
22:00 resistor burnedddddddddddddddddddddddddddddddddd......... its often burns
iti place diablo4? :D
Resistor shorted? Lol
Nu puteam sa-l repar pe asta nici cu slujbe!....asa ceva!!!!??!!!!! uau!Asta DA defect!!!
This small thing making this big issue?
Still don't understand why that resistor was causing the BQ chip not to send 25v to the gate of the FETs. As you said there must be some other circuit fed from that resistor that is controlling the BQ chip and preventing it turning on the FETs. Replacing the resistor with a link was enough to trigger it to work. Must be components changing value as they get older - drifting out of spec maybe.
Very odd. From what I could see there were two series resistors, one for each mosfet (PQ56 resistor shown at 6:59, PQ58 at 29:19). The schematics for various revs of this laptop suggest low values (0R, 2R2 etc) and although the BQ datasheet seems to omit them, it is good practice to include them (at higher values for various technical reasons). The original issue (BQ seems not to start properly) may still be there.
Funny but this isn4x you have video with the problem im just having with my laptop
Sometimes I believe in the tooth fairy to.
I shouted as loud as I could; please remove the charger!
you desoldered the resistor, saying it was partially shorted and that's total nonsense, you didn't check the resistance once and you claimed it was unnecessary and it was supposed to discharge the mosfet gate, so it's a strange repair
Absolutely. Partially shorted resistor makes no sense. Resistors rarely short, they simply burn. Increased resistance, theoretically possible, but we can't tell for sure.
MOSFETs -> parasitic inductance -> C-L-C input loop -> rapid switching of input MOSFETs.
Manufacturer noticed some oscillation problems between capacitors across MOSFETs, so they've put a resistor to stabilize the loop.
Carbon film resistors never short except when they melt. The resistor Sorin removed seemed to be healthy. So, the only chace for that resistance to be the culprit would be a increased value one or a opened one, keeping the Mosfet on open-circuit condition.
@@cyberpeque i dont know why, but i removed the same resistor and laptop started working, he replaced other components for nothing, but hey its fix ...