LFC

An apparently stone-dead Envy 360, no charge light with a known-good charger. Very happy with this one, it's not the first time I've effectively used voltage injection to discover a short, but after the last couple of HP mobos beat me, this was a happy boost of confidence with board repair.
_
Thanks to music bros down below!
Synthis - / samsynthis
Counterwise - / xdcorndogxd
Ertrii - / ertrii
Thomas Hood - / officialthomashmusic

[@sandsatcranes]

Brilliant video! I was successful on my first ever try at attempting something like this. Thanks so much, my granddaughter is happy to have her laptop back in working order!

[@ACOnetwork]

It is interesting, how that tiny SMD messes up things 😁

[@cribish5752]

i have this problem but are afraid to try it myself incase i screw it up

[@nilaydesai4075]

You are applying 1-3amps on Main Vin of this laptop but how much Voltages ?

[@Adamant_IT]

Usually 1v. Sometimes you need to go up a little more if you need to get 3-4amps in.

[@epolakvideo]

One question though, is there a good reason why you use a hot air gun to remove the dead caps as opposed to a soldering iron? I'd like to take my first attempt, but I don't have a hot air gun or I should say the only hot air gun I have is rather huge, it's for removing paint...

[@Adamant_IT]

You can remove SMD stuff with just an iron, especially if you add low-melt solder or other techniques, hot air just makes it really easy. And yea, use a soldering hot-air station, not a DIY hot air gun ;)

[@sam_8a]

You should get thermal camera

[@DanielsGameVault]

Oh DEFINITELY show more failed repair vids - it encourages people to actually do board repairs since it shows what can go wrong :D

[@hans429]

Wrong! It shows you what not to do! :)

[@super_straight]

next time i am flying over the UK, I will ask the pilot to avoid going over your workshop, just in case there is this teeny-weeny interference :D

[@TheHarpanOnly]

I dont understand why youtube need couple of years just to directs me to your channel.

[@Kalma-cn]

me too

[@mupendra5108]

Hi bro I have issue with my hp pro book 6550 b laptop The charging LED was blinking 8 time When I press power button Mother board is not turn on Hp probook 6550b laptop I did RAM cleaning Additionally components disconnection Charger was good And mother board voltage is 19.45v Help me

[@pascalphase2556]

Learning a lot from your channel, you're the man my friend ! bravo from France...

[@Stoney3K]

Sounds like you could really use a thermal imaging camera to find any faults on a board like this. Inject power, point the camera at it and you can find the faulty component straight away.

[@oddity4650]

Yes good point

[@christopherhite9050]

Congrats on another successful repair. I always enjoy watching your videos. I repair radios, and always enjoy a change of pace. You may want to reconsider your philosophy on not replacing bypass capacitors (especially very close to MOSFETS used in switching voltage converters). These circuits create a HUGE amount of high frequency switching noise that is very rich in harmonic content. Although you are fixing the primary problem of the computer not powering, you may very well be creating more obscure issues with freezes, reboots, memory errors, etc. by allowing the very dirty power to continue on the trace to the next circuit. Forget interference with external devices...you should be concerned about interference with the device you have repaired. Since these tiny SMD capacitors are only pennies each, I would suggest having them in stock and replacing them when they fail. Would suck to have your customers saying...."that guy did a great job repairing my computer, but the computer hasn't seemed quite right since he worked on it". If you find time, you may want to watch this video: kzbin.info/www/bejne/b3bEhZeZZ9KlaZY Good Job!

[@andre_warmeling]

I guess the main problem with that is not having schematics or reference on what spec of capacitor to put back in place.

[@andre_warmeling]

I repair logic boards as well, and whenever a donor board is available, I do happily replace every little thing. But many times, you won’t have it available.

[@devonwilson5776]

Greetings. Great advice. Thanks for sharing.

[@rickstechrepairs]

Great video Good footage quality, great knowledge, limited filler (good use of fast forwards) This will give me some new methods to test out some HP's Thank you

[@getu211]

Your procedure,the way you explain some of your professional approach in addition to the knowledge you gave us My appreciation

[@RobCLynch]

Brilliant video! I'm still miles away from attempting this myself, but each time I watch you work, I pick up one or two little things. I suppose it's simply a culmination of knowledge. I still think you could've been a dentist lol. Thanks for uploading.

[@protonx80]

remember you should employ current injection ... or supply with an external power supply only if there "is" a short ... and supply voltage should be what the portion of the circuit being tested normally is designed for ... do not supply 19 v to the section designed for 3.3v or 1v etc . if unsure .. choose the lower voltage

[@thingshappen9199]

So a good way to start finding faults is to check the resistance on the power jack and if its less than 40 kΩ then there's something wrong in the board?

[@AMComputers]

Another great video! I learned a bunch from this and now have more techniques to try!

[@gokusabi]

Hp boards have little balls of solder that work as power supply separators so u just get them off the board and all zones of the board get isolated, the finding the shorted zone is way more easy

[@protonx80]

you have a very good and sincere manner of explaining ... i ve been following your channel for quite some time now .. thank you just a side note though ... you mention "voltage injection" as the method you employ to find the short .. by heating of the component thats shorting ... however ... should it not be "current injection" actually ... the voltage is irrelevant ... as it will fall depending on the powersupply and the current drawn by the short ... however it is the current that is being injected ... to find the component that gets warm/hot actually it doesnt matter what we call it 😊 only that every time i hear it i correct it in my mind

[@TheGeekAid]

+1 sub, good job

[@robmichiel6648]

Great job! I usually start pulling out caps and see if it doesn't beep anymore but this might be a quicker way to find the short

[@debscarff2365]

Hi, we have an old HPEnvy x360 13 ay000na. It won't turn on and no charge light. Considering copying your methods as the computer hasn't been used for a few years, so feel we have nothing to lose but not your its for amateurs like us. Any opinions please.

[@longgo]

Great job 👍 And thank you for sharing the info.. How many degrees in Celsius you did set up the heat blower? I think hear 120.. but that is a bit low I think.. Once mate bring some Zen book that went in total "zen" mode. And when try to get some capacitors and mosfets out I have to put almost to 400° my heat gun to get result.. All that new tech have lead free solder so it is pain in the a$$. And I guess because is hard it also crack the ball solder points under the CPU and board end up dead... Now at my desk is one HP envy that look way different that that, but has power, charge.. just when you push start.. board start but no picture at all.. I presume the CPU have crack solder or it is already in "zen" mode...😂 By the way you can buy not bad thermal IR camera for about 180-200£ that will help you detecting of heat emitter on the board.

[@mihapeterle204]

ALERT I WNAT TO HELP YOU FIRST when you inject power into your mobo dont say tracks can handle 19V they are rated for mby 8Amps and if you add ist R its mby 0.2 to 10.8V max SO dont say they can handle 19V say they can handle ~6A (good luck puting more than 5V on it whitout current protection) SECOND your soldering iron tip is fucked you should use temperature under 400C or under 750F (mby you turn it up when you solder on ground or bigger pads) and your tip should be tinned (shiney looking) your tip get more gray if you overheat it so its noth worth it

[@thetravelernumber1]

Hi morning m laptops repair amateur and wanna buy simple and cheap soldering equipment any advices pls

[@Mohamed...Mostafa]

Great work but maybe you should change the two capacitors the bad and the good one too by the same size and color

[@HarPreetSingh-gx9qo]

Thanks 😊😁 once again ❤️

[@ikontechnicaldevelopment8265]

Man you always get the lucky one's LOL every single short i got is a dead cpu drives me nutz (or im nutz but i inject and the cpu gets warm nothing else) Do you get many of those on HP? i got a rework BGA station i remove CPU and short gone lol damn cpus cost more than a used board so stupid for me!!! I try to buy some of the AS IS boards but some them dead cpus to LOL

[@krisd1000]

I found an hp pavilion x360 with 180 ohms on the input jack and it cuts out the charger, could it be the CPU? I measured 4 coils near the cpu, 2 of which had 0.6 ohms and one has 4 ohms and one has 10

[@pintokitkat]

I can understand dual phase voltage supply on AC, but how does it work in DC? 5v is 5v is 5v. I don't see how a steady, smooth DC would benefit from layering another steady smooth DC over the top of it.

[@rohinchand]

THE VERY BEST VIDEO, : GRAHAM, WE WANT BOARD REPAIR BASIC VIDEOS ON ( HP,TOSHIBA,ASUS,LENOVO,DELL AND MORE STUFF LIKE THAT ). I THINK YOU SHOULD START A NEW SERIES OF "BOARD REPAIRING BASICS "OF THIS KIND OF LAPTOP OTHER THAN APPLE MAC BOOK. BECAUSE THIS KIND OF LAPTOPS REPAIR VIDEOS ARE NOT AVAILABLE WIDELY ON KZbin . MORE OVER THE OPEN BOARD VIEW FILES AND SCHEMATICS ARE NOT AVAILABLE ON THIS TYPE OF BOARDS.IF YOU WILL MAKE VIDEOS ON THIS TYPE LAPTOPS THAT WILL DEFINITELY GO TO YOU IN {1 M} SUBSCRIBRES RAPIDLY. SO LET MOVE ON ....... . YOURS FRIENDLY ROHIN CHAND INDIA

[@cody181818]

I think my envy 360 is having the same issue as thing. It gets no power no charging nothing at all. How much dose this repair cost?. I live in Portland Oregon area.

[@marlonfernandez3093]

interesting, informative and knowledgeable.. keep it up dude!

[@FM-um3yk]

I have a problem. screen's lock. I forgot my mobile code Can you unlock iPhone X Max?

[@Bh-lb2ds]

My lenova ThinkPad red power on and no display but the cpu makes some clicking noise when battery in and charger and no noise when battery out

[@teraaret9356]

At the 5:50 you are checking the ground. I have an ultrasound device and it's not detecting the probe. When I check the ground it's not connected. Is it SC in somewhere or what? Any idea?

[@Collinormous]

I’ve got a pile of dead boards next to me because I’ve been trying to figure this all out - but I’m making progress!

[@BcheriJ]

Hey do you have a video for Legion y530 ich ? I have a similar problem for my laptop. No power and no charge light

[@inframe31studiosphotocinem52]

God damn, why not make a patreon account and get the people buy some tools for you. I really disturb when you go to solder something. And please make some fume extractor for your safety. 👍

[@Amplec_Technologies]

Thank you sir ❤️ huge love and respect from India. I also work on the same field. Your videos are full of courage, knowledge and motivation. Keep up your hard work ❤️. Greetings 🙏

[@Hb-Tunes]

Hi am David from Ghana and my hp 15dw3033dx motherboard is dead. Can you do a video on that?

[@patrickadina5179]

Hello sir please i need your help, i have hp pavilion dv6 no power no charging light and if i put the power cable in the jack then it touches

[@Gung-Flu-Fighting]

that is checking resistance thru your body not the laptop. you can not be touching both test leads, or the wires youre testing or you get a false reading

[@bardos]

Loved this video and your channel. Learning so much. My power supply is arriving next Thursday

[@patlemire6019]

i have been trying to see what type of cameras system you use to examine the equipment you repair?

[@edwardsimbulan3838]

why you should back the capacitor smd wad fiter the volt why you bring it back same smd stop repair thats all i can say

[@gibson7654]

4:35 I was getting 343 kOhms. Can anyone explain what that means?

[@GThu1]

I actually learnt a lot from this video. Thanks!

[@cody181818]

Do you do repairs?. I have the same problem with my envy x360 convertible. Its the same laptop you have here. Would you repair it if i sent it to you?. How much do you charge if so?.

[@JT-qf4it]

Why not use a thermal camera to see the hot component when injecting voltage?

[@YLTLYY]

I please can I use capacitance PF15 for PF16?

[@kurianw8538]

Nice video. I have similar problem HP Envy, no power & no charge light. But when I measure resistance at the charger its open. I have checked the dc jack to see the voltage is coming to the motherboard. Appreciate any troubleshooting tips.

[@Adamant_IT]

I assume there was voltage going into the mobo? At 7:20 you can see me checking for short circuits at the 5 and 3.3v regulators, simply by checking nearby capacitors. Start by finding those regs on your board, and checking (powered off) if there are any caps nearby that measure ground on both sides. If there's no short, plug the board in and see if you get charger voltage around those caps. This establishes if the main power rail in the laptop is actually online, or if it's shorted.

[@kurianw8538]

@@Adamant_IT thanks. Will try

[@azsbasicproject215]

thankyou for that idea sir, Godbless🙏

[@jugnu361]

buy a thermal camera................ you desperately need it

[@bestbuildpc]

Avoid HP. Lenovo and ASUS are the best!

[@UNNIUTHAMAN]

Can you make a viseo for no display problems please sir

[@byronwatkins2565]

For $0.003 why not replace the chip capacitor and return the device to factory specifications? Radiating RF is annoying and costs energy, but spikes can get picked up by signal traces and cause intermittent errors as well.

[@beardyface8492]

And what value do you guess for said component? If you don't have a schematic or spare donor board you've no way to actually know, it's not like you can measure the value of the shorted one. Even when you have a pair side by side, the fact they're the same package/appearance, doesn't mean they're the same value.

[@nilaydesai4075]

bdw super informative videos

[@josepholateru6474]

This came really really helpful

[@sherwinlloydgotual6958]

thanks, i repaired mine now.

[@googlechrom4921]

HD1 flex cable connector burnt, please please need the 12 pin pinout, I have identified on the board from left to right [1234567sata,{8?,9?},10,11,12 5v]. Pins 8,9 unknown? Please help thank you

[@soulrebelno1]

Great video. My HP Envy 17-ae101 laptop has just died on me and I think it's a short circuit on the motherboard, and it looks like it will have to be replaced. It's a £1500 machine and I've had trouble with it from day one. One thing is certain though - I'll definitely never buy anything from HP again!

[@YrHarlow]

I pledge to ur teachings

[@johnsmith-tr3dh]

About injecting power for diag purpose. Ive watched almost all of Sorin's videos at "Electronic Repair School" channel. He goes to "injecting power" as a default method of finding short circuits. That being said, he has received a lot of complaints through his channel of people not being experienced enough using the same method and frying their motherboards. He's talked about this subject many times. It would be nice if someone would do a vid or series of vids on how to power inject without damage. I watch your videos now because it got very distracting with Sorin who get distracted a lot and doesnt edit his videos. He leaves you hanging while he talks on the phone or with co-workers. Great channel, btw.

[@onurolce]

Maybe you should solder a new 2nd capacitor as you should and then get more than 100 kOhm resistance between DC plus and minus pins ?

[@weerobot]

Hidden screws rant...lol

[@Watch__This_]

bravoo..great videos, go on...

[@rexrobs1981]

Thanks for this. its really good. I have a Sony vgn-aw11m that's heats a lot near the Hard DISK. On the other side of the board there is an intel chip. Wondering the Problem and a Sony vgn-aw11z that powers on with no display. Diagnose for me please. Thanx for you work

[@jmdb1414]

Basic question: as the short was on a secondary rail and all the mosfets were good, I wonder why you can still see lower resistance on the DC jack input. I would have thought that the mosfets would have prevented the short from travelling back ( even though with a weaker short reading than on the fully blown rail).

[@Ilegator]

Great videos. I'm taking so many notes while watching these. Thank you!!

[@cmdelpino]

This is sooo awesome! First video I watch of yours, I don't know how many you've got, but I'm going to watch them all this weekend 😎. (Can't right now, got to go tell my friend the bad news about her HP Envy 13... 😕)

[@springer-qb4dv]

Extremely helpful video. Thank you. My thinkpad died no power light no charging. Using your video as guide, I was able to solve the issue. Basically 19 volt power rail was shorted and mosfet near power jack was overheating. But the actual culprit was a shorted cap far away from the power jack which was detected by checking for overheating. Diagnosis wasn't too bad, the most frustrating part for amateur like me was microscopic cap flicking away from tweezer and lost never to be seen again.

[@Martin-ot7xj]

Hi there , just i wanted to say thankyou for your tutorial video , your explanation was very easy and understanding , please upload more like this video . it absolutely for beginners . your explanation was amazing . keep it up . thnx

[@danicuevas4334]

Omg this video gave me new ideas for trying to fix my laptop, I already solved one dead short but I think I'm having another one like the one on this video, keep up the great work!!!

[@babumt2659]

Pls start another seriess

[@catherinemorgan2741]

your very good teacher

[@hanzomiguel]

whaT alcohol do you use?

[@albertogog8567]

When you measure the resistance en the cord which values correspond to each failure? You say 100kohm would be normal. And 40 is a short but not on the main rail. So a short in the main rail how much would it be?

[@Adamant_IT]

Main rail should be high-resistance, anything less than kilo-ohms is a fault, a proper short is 1ohm or less. This is very generalised though, the CPU and GPU will both read as very low resistance (0.5 - 3ohms) so if one of the power mosfets has failed short, you'll see the low resistance of the CPU/GPU on the main rail, and that skews all your readings. LFC#284 is an example of this, although it wasn't a super low resistance.

[@albertogog8567]

@@Adamant_IT thank you, I'll see that video. I started repairing boards a few weeks ago. I'm in process of watching all the videos of this list.

[@piecutter2]

I like this method, going to give it a shot. I'm not reading much of a short from the charge port, but definitely a lot of smd caps straight to ground on both sides in the same area. Just having a hard time finding correct pads to inject from!

[@tonytrilex2555]

No microscope? You gotta get those buddy but you are very good at finding the issues.

[@stevencharette7918]

i really wish i had you laptop problems, i have 3 boards all high end, Alienware 17 r4 it did have a short to ground fixed that but it cooked a IC which im waiting for and also a fet, then i have 2 g751jy no short to ground and one i really believe is just a gonner, and the other boots up then turns right off after 2 mins either its a corrupt bios or the batt because if i try to attempt a flash in bios it says the batt isnt connected and its connected anyways good stuff learning so much really wish my boards were a short to round though i got the never can be fixed problems

[@Adamant_IT]

I know the feel... I wade through a lot of fails between the wins. I want to share fail videos as well, but often there's nothing to learn from an hour of head scratching followed by "I have no idea what is wrong with this."

[@stevencharette7918]

@@Adamant_IT omg good news though i did fix 1 of my asus boards last night after 10 HOURS!!! spi eeprom programmer exp2019+ c=kept corrupting the bios flash then i flashed with 25q64FW instead of 25Q64 the laptop is now working thank you so much for all ur lessons i fixed this board because of you and what i learned thank you !!! ps the other asus board i have pin 8 on the bios is shorted to ground and can you take a wild guess as to what is grounding it lol leads right to the chipset is a gonner as i figured it was

[@catherinemorgan2741]

your very intell man like how you think and your option turn out at the end is very diffed and intell like how you do things far beyond my intell

[@PeraTS]

It's easier to remove small smd capacitors like this with soldering iron with a blob of solder on the tip . Just hold 2 seconds and it will come of . :)

[@brighttech8922]

Just fix an HP laptop with your video thank you!!!!

[@bestbuildpc]

Thanks for sharing

[@djoussdjouss]

Merci de partager votre expérience! Même si je ne comprend pas trop l’anglais c’est un plaisirs de regarder. Comme vous aussi j’ai beaucoup d’échec a mon actif mais je ne désespère pas de m’amélioré. Je vous souhaite plein de réussite pour la suite!

[@parochial2356]

Graham, what is the reason you did not inject at the power supply using your salvaged power cord? As the power supply sees the short, it would be a lot faster than soldering in wiring at a specific point.

[@Adamant_IT]

You have to bypass the inrush limiter (pair of mosfets in series with the DC jack) because the laptop's power management chip will detect the short and cut the power. If you inject behind the inrush limiter, it can't block you.

[@devonwilson5776]

Greetings. Great response, it makes perfect sense.

[@spacecy]

Great fix Graham! Thanks for the educational videos!

[@abaddonhajje9194]

Would you fix a hp omen with the same problem ill pay you good inbox me if interested.

[@oddity4650]

Yes i still get confused when he goes on different bits of the board, i mean i think i got from this video is supposedly one of the elements was collecting the heat or elc and not moving it on to the next bit. Then he fixed a element then the moving of heat or elc became the correct circuit again so the battery and charger worked again.

[@ronaldanomorales]

do you have a back up EC Firmware fil bro? thanks anyway

[@petlover8920]

Bro you really like to play video games with these computers intestines hahah

[@nathanielmorton4806]

You are really the best, your explanations are unique and it makes the work very interesting to understand. Keep it up Adam. From Ghana

[@Danmalamfx]

Thanks alot.

[@catherinemorgan2741]

lol i heard it

[@quatlewmeez]

Brilliant video. What device did you use to inject voltage?

[@petermars5997]

Thank you.

[@eliemazraani1685]

Very Good, Keep the Videos coming, thank you

[@eddyjong4369]

I have a dell 7000 laptop it wont work anymore in ac power only