I learnt even more watching this and we all know you could have fixed it but the labor cost would have been more than a new motherboard is worth. I think when things do get complicated we learn more from you as you deep dive into diagnostics. Its great to see quick wins and great to see the tricky ones. Its a win win really. Thanks!
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You have extreme patience with technology. I know what it's like to troubleshoot so many issues only to have another item bork the system. Thanks for posting this!
Like watching a really good detective film with a voice over by Louis Theroux. You really have to know what you are talking about to explain this stuff so simply. Brilliant.
I think insufficient power to CPU is causing it to cut out when trying to boot, but can just POST. Hard luck after trying so hard, but this video is of great value to anyone trying to fix power faults on laptops.
Just making a point here, but I think that personally, I learn more from "fails" than from the repairs where there's like an obvious short of some kind. So thanks and props for posting these repairs as well!
I used to repair pcb at home when I was studying in college I used to spend 2-3 days after long way I decide to give up and think Im so dumb I used to feel low because all that hard work wasted I thought I'm bad in electronics but after seeing your videos I realize even professional ppl do giveup
Yea, for every victory, there's at least two fails. And it's not always lack of skill - some of my fails in the past I'd know how to fix today, but also many of my fails are just dead-end boards that have a dead PCH or something else that's just not viable to replace.
My advice is not to trash it but wait 6 months or a year or two and get it back out again and likely you will go straight to the problem. But you will have to replace the mosfets to start back at ground zero.. I enjoy these videos a lot.
Adamant IT absolute class mate, laughing my head off cause I have been there for weeks. I thought you might have bounced that board off the wall instead of hanging it there. If it's any consolation I still haven't repaired the board I was working on I had to walk away as it was driving me mad hence sorry for laughing but I hope you will understand mine is an Acer5742 only used for about 4 months but old now. Great videos have you tried Boardview I would like to see some how to videos on Boardview, Many thanks.
My sister brought this machine to me from work. Turns on, screen backlight, no post, no video. No beeps. I started down the rabbit hole and blinked. It's still In the bag in my room after two years.
Thanks for the uploads been watching so many of your vids last couple days I find your repair videos more of my liking but do like the PC build vids as well but more favor the repairs and find them very informative I dabble in basic computer repairs never really got interested in going down to motherboard component level as I'm more skilled in big board components from say older TVs But got hands on a few laptops recently one was water damages after roof came off during a typhoon and another that has a charging light but won't do anything else so these videos come in handy to earn a bit more on Mobo repairs work out if worth me getting the tools and go at laptop repairs as an extra income
I watched almost all of your video and every time you impress men And every time it's a like 👍 for you. Thank you very much for the time you take to do the videos good continuation
Wow, incroyable incroyable incroyable very interesting video frankly it's really you have a lot of patience to fix the pub thank you very much for the nice video.
Hi @Adamant IT, I am a beginner with this sort of stuff but was wondering if that was damage under the pad you are at. 30:50 It looks like a crack or deap scratch. Keep up the great work love your vids.
This fault and other Dell "no power" on the on switch is often the actual switch itself. The square ones are awful and the round ones on XPS are similar. They fail internally and can be wired around. Then the dead power switch has the effrontery to glow as if it is on! The light is but the switch is shot. Dells are usually rather good but hinges and power switches are both heels of poor Achilles.
Curious to know if you put in all good mosfets. And wondering if the batt pmic is bad if it were to keep halting. That would control the inrush mosfet.
the cpu and gpu have very low resistance.. and if you check coils connected to them using diode mode and/or continuity, you'll get beep.. it doesn't mean it is shorted.. or they default to shorted to ground for safety.. doesn't work that way.. it has very low resistance because ohms law.. you have a semiconductor running at 1V or less and taking upto max 30A on each rail.. 1V / 15A (let's say it's a 15W cpu) = 0.067Ω.. yeah.. it will beep..
This must be one of Dell's worst models. Sadly I am one of the unfortunate owners of one myself, and Dell has refused to refund, repair or replace my laptop that has malfunctioned spectacularly since the first couple months. I have given up on the lawsuit for the time being, but may pick it back up when I have the time/energy to do so. Luckily here in the Western EU, consumers are well protected and I have really nothing to lose but lots of time and effort.
Interesting to watch the process to isolate the fault. I was wondering what was behind the decision not to spend < 10.00 GBP to replace the failed / removed 2x MOSFETs (?) even if only for science?
The missing fets would not have been contributing toward it not detecting drives. If it wasn't for the no-drives-detected issue, we would've been 90% there, and I'd replace the missing fets, but yea, no drives detected is nothing to do with Vcore.
So why didn't you just pinch a mosfet from one of the parliament of pcb's on your wall? Edit: I probably should have watched right to the end to see it was moot
Hello! at 28:35, wouldn't be easier to inject voltage right away on the VCC main rail? If this rail is working, it can send the voltage and amps necessary to burn the shorted component even if it's on the 3.3 or 5v rail, no? Thank you! Again, great video, I'm definately a new fan!
Edit : Im stupid, didnt think of that. CPU mosfet who knew. Right now at 1:00:30 but yeah intel cpus and nvidia gpus will run fine without one of the mosfets. I got GTX 1080 Ti gpu i fixed by removing shorted to ground mosfet, just 1 power phase is down and there is plenty of headroom in GTX 1080 Ti vrm. Sata powerplane is directly connected to 12v, 5v and 3.3v powerplanes and they are directly converted from power supply output, id say that psu is bad and it cannot handle more than cpu and gpu idle power, voltage drops way below 19v but enough to still keap power light on psu cable. But no idea on whats killing phase 1 cpu vcore mosfet.
You ever thought about a thermal camera - seen videos of these - they tell you the hot spots - is that transistor the same model# or different from the one you took off
I've been staving off a thermal camera due to their cost, but having had a lot of people suggest it over the past week I took another look, and I can see that older models aren't massively expensive anymore - so yea, I might invest soon! Transistor was the same, this board uses the same mosfets on the GPU phases as the CPU. These kind of mosfets are made specifically for generic VRM designs, and are fairly interchangeable, as long as they all match.
2 things and I know you threw in the towel already we've all had one of them and like you said the amount of time it takes would be worth more than just a new laptop, I don't think the sata controller is borked it's a bit late now but I am pretty sure if you tried to boot off usb you would've had the same problem if not (and my second thing) I would've been interested to see if it boots off ssd since it drawing less power is the only real difference.
i was able to make a computer boot up by injecting 1.5v on ram's phase , it was shorted through the charger, but when i removed the mosfet responsible for the RAM's buck, and injected 1.5v, it worked just fine, and as soon i replaced the FET it just blew up again, and take the ram together... just ordered a new MB before the cpu was the next victim... EDIT: it was "liquid damage".
Ciao ! anche io sto tentando di riparare lo stesso laptop ! Ho appena acquistato una nuova CPU pensando che fosse in corto circuito ! 😭😭😭 Ma se è vero quanto dici tu riguardo la Vcore sono fregato !! Mi confermi che la Vcore viene messa a terra quando non è attiva? Misurando sui condensatori della Vcore con il pc acceso lego cmq zero volt ! Grazie !
I WAS SCREAMING HIGH SIDE VCORE MOSFET THIS WHOLE TIME I have had this exact issue with a Dell Latitude D630, it had just ONE shorted CPU VCore mosfet. No matter how many times I replaced just that one mosfet, it would keep blowing it over and over again. But the laptop worked alright without that phase for some weeks but then the charger light cut out again, and northbridge..was reading short..and the northbridge kept blowing its high-side mosfet....very strange....when I get a repair like this where the same mosfets blow over and over again and i have already swapped cpus but it still wont work....it should be binned....probably pch got toasted or something
Hi I hve issue with microsoft pro 4 won't power on and the other one powers when disconnected from power how much do u charge were are u located any info plz
I want ro ask you a question i know its dumb how to know positive and negative in power rail indactor because i practise to take mesurment on my laptop when i want to test how many voltage and no succes
Out of interest, why did laptop manufacturers stop making boards with removable CPUs? If there any strategic advantage? Was removability not leading to upgradability?
A short on Vcore is most likely going to be the Vcore mosfets or driver, so I'd start by removing all of them and testing them off of the board. There's also the bypass capacitors (the huge bank of caps under the CPU) but I don't think I've seen failures there before - which doesn't mean it can't happen, just that I've not had to deal with it.
I think u were new here with laptop repairing? your approach to diagnose were a bit weird.... Why not injecting voltage after the current resistor on the main 19v rail to start off. . if there is no short on the main rail, measure the first and second mosfet check and seek the 3v and the 5v coils etc..
Hi, I enjoy watching your video. Your customer does not pay you unless you succeed to fix it? I believe they charge you like $50 only to diagnose to locte where the cause is and ask customer if they pay for fixIng which in this case exchanging motherboard in Japan.
@@Adamant_IT Yes but there is also a lot of waste of time when you have customers that won't tell you the truth about how a device "suddenly" stopped working! I'm sure you have faced a lot of them but the time of truth comes only when the device is fully opened most of the time!
![Toshiba C55 No 3.3/5v rails [Fail] - LFC#216](http://i.ytimg.com/vi/bFtcpo3_mwE/mqdefault.jpg)
![Toshiba C55 No 3.3/5v rails [Fail] - LFC#216](/img/tr.png)
I learnt even more watching this and we all know you could have fixed it but the labor cost would have been more than a new motherboard is worth. I think when things do get complicated we learn more from you as you deep dive into diagnostics. Its great to see quick wins and great to see the tricky ones. Its a win win really. Thanks!
Man these videos are addicting to watch, even if they're failed repairs.
so true!
@@hadireg I cannot stop watching too...........it's the algorithms...... the algorithms.......or just really good content!!!!
Let's see some laptop disassembly montage videos! It's like watching a waterfall!
@@christopherfarrell-artist3557 pp]ppppppppp]p]pp7ppp]pppppppppp]ppp7pppp]ppppppjpppjpppppppppppppppp]ppopppppppppo7pppopppp7pppppppppppp]ppppppjpppppppp]pppopppjpppppppppopjp7pppppppppjppppjpppppppppppppppppppppppppppppp7ppppppppppppp]]p]ppp]ppppjpppppppjpppppop7ppppppppppppppppjpop]ppppppp]ppjpjppppppppppppppppppppppppppppppjpppjppjppppppjpjpppppppppppppppppppoppp7pjppopjppjppjppjpppppppppppopppppp7ppppppppppppjppppjp7ppppppppppppppppppopppppppp7ppppppp]ppppp]pjppppppppppppppppppppppppppppppppj7ppppppj7pppppppp]popular j7pp7pp7pp7ppj7pppppppppp7jpppppppppppppppppppppppppppppppjp7pppppop7ppppp7pp7p7ppjp7pp7ppppp7pp]pj7ppppppppp7pp7pp7pp6jp7pjpppjp7pppppp7ppjpjppppp]pjp77pj7p7pppjpppp7pppjpppppp]p7p7ppppjpppjp7ppppp6p7p7jpp]p7ppppp6jp7pp6pp7p7ppjpppppppp7jp7ppppp7ppppjp7ppjp7pppppppp7ppppppppppppppppppppppppppppppppp7p]7p7pp7p7ppp7pp7p7pp7p7ppp7ppppjp7p7p7pp7p7ppp7pp7p7pp7p7ppp7ppppjp7pppppp7p7p7pppp7p]p7pppppp77pp7pppppp7pppjpjp7jp7ppppp7pp7ppppp7pppp7pppp7ppp7p7ppppjpp7pppj7pp6j7ppppp7ppppppppppppppppj7pjp7pppppp7ppp77p7p]ppp7pppppp77p7pppp7pppppp7pp7ppp6pp7pppppj7pppj77p7ppppppp7pppppp7pppppppppppp77pp7ppp7ppp7pppppppppppp7ppppppp7pppppj7ppp7pp7p7p77ppp77pp7pp7pp7pppppjp7ppp77p7ppjpp7ppp7p7ppppj7pppppppp7pppppppppppjp7ppppjp7pjppp7jpp7pj7ppppppj7pppjpp7pjpppppppjp7pppjp7p7p7ppp7pjp7jpp7p7 pj77ppppppj7p7jpppppp7pppp7ppp7p7pp77pp7p7ppppppp7pppppppjp7p]p677p67pppppppp7ppjp7pp7pppppppp7p7pppp7p7pjp7p7jp7pp7p7p7ppppp7ppp0pp7pppppp7jppp pjpp7pppppp7ppp7ppjppp7pp7pp7pp777pp7pp0ppppppp77pppppjpppp7pp7p777ppppp7pppppp7ppppp7pppppppp]pppppjp7pp7p7p7pppp]ppj7ppppp7pppj77ppp7p7pppp7pjp7ppppppppppppppj7pp7ppj7ppp7ppppjpppppppppppp7pp7pppjp7ppjppppppppp7ppppp7ppppp7p7pp7pppppppp7p7ppp7ppppppj7pppppppppppp77p7p7p6pp7p77pp7pppp7ppp7ppppppppppppphppp77ppppjpp7pppjpppppjp7p7ppppppp7ppppppp7pppppppppp77p7pppp7pp7pppp7p77p7ppp7ppp7pp7pp7jppppppp7ppppjp7p7pppjp7pp7pp7p7pppppppppppppppp7pppp7p7ppjp7ppppp7p7pp7ppppjp7pppppppppppppppppppp7p7pjp7ppjpp7pppp7ppp776jp77pppj7p7pp7ppj7ppppj7pp7pp]pjpppppp I km pjppppp7j6pjp7pj7ppp
@@hadireg jpp6po
love the way this guy deals with frustrating moments of failure;
well done !
You have extreme patience with technology. I know what it's like to troubleshoot so many issues only to have another item bork the system. Thanks for posting this!
Like watching a really good detective film with a voice over by Louis Theroux. You really have to know what you are talking about to explain this stuff so simply. Brilliant.
Oh man, I was so frustrated just watching this, but I admired how you tried and tried....nevertheless, still a great learning video for me....cheers
The analogy of a laptop drinking power through a straw is absolutely epic and instantly understandable.
I think insufficient power to CPU is causing it to cut out when trying to boot, but can just POST. Hard luck after trying so hard, but this video is of great value to anyone trying to fix power faults on laptops.
Just making a point here, but I think that personally, I learn more from "fails" than from the repairs where there's like an obvious short of some kind. So thanks and props for posting these repairs as well!
All your videos are superb Graham! Keep up the great work!
I've just recently subscribed to your channel because your videos are very informative, I feel I can learn something from you. Great stuff
Brilliant analogy about the incoming resistor limiter!
Thanks for posting this video.You can't always win but you can always learn something.
That was really amusing man, I know exactly how u feel.
The struggle, the struggle, the struggle is real!
wasnt able to repair but what a good experience! nice work bro keep it up
Nice video bro, i really know how u feel, been thru there. Patience is very important in this job. Keep up posting the video ya. Thumbs up
You know, of all the rabbit holes I've been down, I haven't seen one wabbit. But I learned a lot... Cheers!
1:14 - Mass Effect!! :)
I know (practically) nothing about electricity, so I have practically no idea what you were doing. :)
Where there is no pain, there is no gain?
You can't win them all???????
Enjoying all your vids, keep it up!!!!!!!
I used to repair pcb at home when I was studying in college I used to spend 2-3 days after long way I decide to give up and think Im so dumb I used to feel low because all that hard work wasted I thought I'm bad in electronics but after seeing your videos I realize even professional ppl do giveup
Yea, for every victory, there's at least two fails. And it's not always lack of skill - some of my fails in the past I'd know how to fix today, but also many of my fails are just dead-end boards that have a dead PCH or something else that's just not viable to replace.
@@Adamant_IT hi pls I've this toshiba satelite l305 with charger light on but no Power on
@@brainknowledge80 try reseting the BIOS
My advice is not to trash it but wait 6 months or a year or two and get it back out again and likely you will go straight to the problem. But you will have to replace the mosfets to start back at ground zero.. I enjoy these videos a lot.
Incredible detective work, really cool to watch.
Adamant IT absolute class mate, laughing my head off cause I have been there for weeks. I thought you might have bounced that board off the wall instead of hanging it there. If it's any consolation I still haven't repaired the board I was working on I had to walk away as it was driving me mad hence sorry for laughing but I hope you will understand mine is an Acer5742 only used for about 4 months but old now. Great videos have you tried Boardview I would like to see some how to videos on Boardview, Many thanks.
15:05 - I think there's two supplies going to the CPU: VTT and Vcore, hence the two buck converters....just my 2 cents (repair technician as well :D)
I'd watch the whole thing, this was better than a movie
Brilliant .. that was awesome journey to be taken on ! thanks for sharing !
Man you're awesome. And super smart too! Thanks for posting.
even tho this laptop dident work i still learned watching thanks
The video is full of inspiration, motivation and knowledge. ❤️
If you keep blowing FETs on that particular CPU VR phase, the inductor on that phase is probably toast.
That appears to be the laptop I have (model wise). Great laptop, for it's time.
L-O-V-E this channel!! Love it how you read the schematic. I learned a lot from you :-) thank you
Kbjkbbjbbjkbb
My sister brought this machine to me from work. Turns on, screen backlight, no post, no video. No beeps. I started down the rabbit hole and blinked. It's still In the bag in my room after two years.
we've all been there guy !............i feel your pain ! :)
Just starting this one up. Have a feeling it'll be good
you so good at what you do i have learnt a lot from you.
i call that uneven fight tho planty tips in it 👍😀👍
Thanks for the uploads been watching so many of your vids last couple days I find your repair videos more of my liking but do like the PC build vids as well but more favor the repairs and find them very informative
I dabble in basic computer repairs never really got interested in going down to motherboard component level as I'm more skilled in big board components from say older TVs
But got hands on a few laptops recently one was water damages after roof came off during a typhoon and another that has a charging light but won't do anything else so these videos come in handy to earn a bit more on Mobo repairs work out if worth me getting the tools and go at laptop repairs as an extra income
I watched almost all of your video and every time you impress men And every time it's a like 👍 for you. Thank you very much for the time you take to do the videos good continuation
10 out of ten for perseverance. Fun to watch. Ta.
I really like this more personal format of Adam Ruins Everything!
*Graham
Wow, incroyable incroyable incroyable very interesting video frankly it's really you have a lot of patience to fix the pub thank you very much for the nice video.
Hi @Adamant IT, I am a beginner with this sort of stuff but was wondering if that was damage under the pad you are at. 30:50 It looks like a crack or deap scratch. Keep up the great work love your vids.
That's just the glint of the solder! Disadvantage of seeing it through a camera is that it's a 2D view!
This fault and other Dell "no power" on the on switch is often the actual switch itself. The square ones are awful and the round ones on XPS are similar. They fail internally and can be wired around. Then the dead power switch has the effrontery to glow as if it is on! The light is but the switch is shot.
Dells are usually rather good but hinges and power switches are both heels of poor Achilles.
you are awesome man! love your works.
lost in the monsters we make
awesome
Absolutely fascinating, Thank you very much indeed !!
Hey @Adamant IT I noticed 1:04:33 there is a loose solder ball floating around that you might want to investigate.
Curious to know if you put in all good mosfets. And wondering if the batt pmic is bad if it were to keep halting. That would control the inrush mosfet.
20:00 it is so satisfying to see someone else go through same existential crisis as i do :)))
52:27 lmfao
This was excellent! Learnt a lot, thank you! ;)
Well done Adam laughed a few times at you....
I'm curious. Are there parts that can be salvaged and perhaps repurposed?
If I was in his place at 52:00 I was like, where is my hammer 🔨🔨..
The Nightmare Board from Hell...lol
I prefer to watch this type of video rather than watching some fake repair video in youtube.
that's an awesome video mate!! 👍👍🍺
the cpu and gpu have very low resistance.. and if you check coils connected to them using diode mode and/or continuity, you'll get beep..
it doesn't mean it is shorted.. or they default to shorted to ground for safety.. doesn't work that way..
it has very low resistance because ohms law..
you have a semiconductor running at 1V or less and taking upto max 30A on each rail..
1V / 15A (let's say it's a 15W cpu) = 0.067Ω.. yeah.. it will beep..
This must be one of Dell's worst models. Sadly I am one of the unfortunate owners of one myself, and Dell has refused to refund, repair or replace my laptop that has malfunctioned spectacularly since the first couple months. I have given up on the lawsuit for the time being, but may pick it back up when I have the time/energy to do so. Luckily here in the Western EU, consumers are well protected and I have really nothing to lose but lots of time and effort.
Interesting to watch the process to isolate the fault. I was wondering what was behind the decision not to spend < 10.00 GBP to replace the failed / removed 2x MOSFETs (?) even if only for science?
The missing fets would not have been contributing toward it not detecting drives. If it wasn't for the no-drives-detected issue, we would've been 90% there, and I'd replace the missing fets, but yea, no drives detected is nothing to do with Vcore.
@@Adamant_IT I believe the problem got worse after the first power injection... What do you think 🤔
So why didn't you just pinch a mosfet from one of the parliament of pcb's on your wall? Edit: I probably should have watched right to the end to see it was moot
Charger with the blue light
Is this a selfless thing to buy
If you check it, you can sacrifice the camera
Learned where testers etc.
Thanks
Hello! at 28:35, wouldn't be easier to inject voltage right away on the VCC main rail? If this rail is working, it can send the voltage and amps necessary to burn the shorted component even if it's on the 3.3 or 5v rail, no? Thank you! Again, great video, I'm definately a new fan!
The secondary rails (5v, 3v3) are 'behind' their respective power supplies, so power injected onto VCC won't leak into the secondary rails.
Adamant IT ahhh! I see! Thanks for the tip!
Edit : Im stupid, didnt think of that. CPU mosfet who knew. Right now at 1:00:30 but yeah intel cpus and nvidia gpus will run fine without one of the mosfets. I got GTX 1080 Ti gpu i fixed by removing shorted to ground mosfet, just 1 power phase is down and there is plenty of headroom in GTX 1080 Ti vrm. Sata powerplane is directly connected to 12v, 5v and 3.3v powerplanes and they are directly converted from power supply output, id say that psu is bad and it cannot handle more than cpu and gpu idle power, voltage drops way below 19v but enough to still keap power light on psu cable. But no idea on whats killing phase 1 cpu vcore mosfet.
Great video, thanks!
You ever thought about a thermal camera - seen videos of these - they tell you the hot spots - is that transistor the same model# or different from the one you took off
I've been staving off a thermal camera due to their cost, but having had a lot of people suggest it over the past week I took another look, and I can see that older models aren't massively expensive anymore - so yea, I might invest soon!
Transistor was the same, this board uses the same mosfets on the GPU phases as the CPU. These kind of mosfets are made specifically for generic VRM designs, and are fairly interchangeable, as long as they all match.
@@Adamant_IT : Get the FLIR camera, you will only regret that you didn't buy one long ago. It will quickly pay for itself in time savings.
Stare at this board and ponder my life...too funny
Hard work by the way, sorry u didn't make it all the way.
2 things and I know you threw in the towel already we've all had one of them and like you said the amount of time it takes would be worth more than just a new laptop, I don't think the sata controller is borked it's a bit late now but I am pretty sure if you tried to boot off usb you would've had the same problem if not (and my second thing) I would've been interested to see if it boots off ssd since it drawing less power is the only real difference.
Hey. I know it's old. But what was that disassembly background soundtrack? :)
i was able to make a computer boot up by injecting 1.5v on ram's phase , it was shorted through the charger, but when i removed the mosfet responsible for the RAM's buck, and injected 1.5v, it worked just fine, and as soon i replaced the FET it just blew up again, and take the ram together...
just ordered a new MB before the cpu was the next victim...
EDIT: it was "liquid damage".
If you have a blown up FET, you likely have a bad controller which caused it in the first place. Same that happened to VCore phase 1 in this video.
Ciao ! anche io sto tentando di riparare lo stesso laptop ! Ho appena acquistato una nuova CPU pensando che fosse in corto circuito ! 😭😭😭
Ma se è vero quanto dici tu riguardo la Vcore sono fregato !! Mi confermi che la Vcore viene messa a terra quando non è attiva?
Misurando sui condensatori della Vcore con il pc acceso lego cmq zero volt !
Grazie !
It was probably hit with lightning, tell the customer to turn it into insurance.
yes I learn a lot too! Not saying I understand it all but it's fun
Prolly a failing motherboard, best option would be to get a new one for that
Eli Tech should be able to fix this :)
I'm just curious as to why these little components suddenly short out
Same reason why a lightbulb blows. Things wear out.
to me this is nt a failed repair more please
I WAS SCREAMING HIGH SIDE VCORE MOSFET THIS WHOLE TIME
I have had this exact issue with a Dell Latitude D630, it had just ONE shorted CPU VCore mosfet. No matter how many times I replaced just that one mosfet, it would keep blowing it over and over again. But the laptop worked alright without that phase for some weeks but then the charger light cut out again, and northbridge..was reading short..and the northbridge kept blowing its high-side mosfet....very strange....when I get a repair like this where the same mosfets blow over and over again and i have already swapped cpus but it still wont work....it should be binned....probably pch got toasted or something
Hi I hve issue with microsoft pro 4 won't power on and the other one powers when disconnected from power how much do u charge were are u located any info plz
I want ro ask you a question i know its dumb how to know positive and negative in power rail indactor because i practise to take mesurment on my laptop when i want to test how many voltage and no succes
one of your best
That was a head killer
great video
Out of interest, why did laptop manufacturers stop making boards with removable CPUs? If there any strategic advantage? Was removability not leading to upgradability?
Hi i always follow you my question is when the shot is on the processor coil how are you going to inject power
Assuming that the CPU is soldered, you can't inject voltage on Vcore as the CPU itself will just sink it.
@@Adamant_IT so in that case which methods will be best to detect the shot
A short on Vcore is most likely going to be the Vcore mosfets or driver, so I'd start by removing all of them and testing them off of the board. There's also the bypass capacitors (the huge bank of caps under the CPU) but I don't think I've seen failures there before - which doesn't mean it can't happen, just that I've not had to deal with it.
MLC caps usually fail shorted due to flexure or thermal stress. They are damned hard to find until they blow up.
I think u were new here with laptop repairing? your approach to diagnose were a bit weird.... Why not injecting voltage after the current resistor on the main 19v rail to start off. . if there is no short on the main rail, measure the first and second mosfet check and seek the 3v and the 5v coils etc..
BEEP BEEP Richie!
U can go to battery terminal inject volts 9volts plus minus
the loose screw fried it
i think you need to add again the power phase going to the processor, it lacks power that's why it goes off,
Enjoyed it , thanks 😊
Man, I could bet the CPU is burning the MUSFET in the Vcore line.
Hi, I enjoy watching your video. Your customer does not pay you unless you succeed to fix it?
I believe they charge you like $50 only to diagnose to locte where the cause is and ask customer if they pay for fixIng which in this case exchanging motherboard in Japan.
It's by choice. Free diagnostics bring in more customers. Some I win, some I lose.
@@Adamant_IT That's how you improved your skill quick, I guess.
@@Adamant_IT Yes but there is also a lot of waste of time when you have customers that won't tell you the truth about how a device "suddenly" stopped working! I'm sure you have faced a lot of them but the time of truth comes only when the device is fully opened most of the time!
Why not try to inject voltage into the dc jack from a current limited power supply?
That won't work because the in-rush limiter will block it. Same reason as why you can't use the laptop's charger to do this.
that dell isn't fixable, it's better off just getting recycled, better keep the hard drive so you can recover the data.
your gate is corrupt, maybe resistor is shorted that's why you blow up fet
Why not inject current to input jack and see what heats up?_
Super ...thanks.
thank you