Hi Axel, I work a lot with FEA and have simulated similar behaviors. The problem has to do (amongst others) with the cooling curve of the soldered object. The thermal expansion cofficient is very low for ceramic parts as the coil and higher for the PCB. So the length of the cooled coil is a bit smaller, but the same pcb length is much smaller (some microns difference). This leads to inbuilt pre-stresses at the coil-board pair, which are added to the forces at, i.e. a drop. Which make them break off at low additional forces. Basically, if the coil is cooled slower at the interesting point of the curve, where fluid turns into solid, the inbuilt stresses get lower and the part withstands higher forces. There are many more effects connected to it, but the coils differ through their ceramic hardness ans low expansion coefficient from all other devices on a PCB. Another aspect is the design of the coil. If the coil itself has got modified in design, it might be more receptive to impulses. Sorry, If the question has already been answered. I am currently sitting in a train and look onto a small device so that I can't scroll through all answers. Greetings from Germany!
@jamesruz3 жыл бұрын
Great knowledge thanks for this
@katusjozsef4533 жыл бұрын
And exactly for this reason have been used previously a special design of component "legs" (Z or X-designs), which can compensate the expansion. Also can be is simply a tiredness-issue (thermal fatigue), but all of those are nothing new. Cheap (bad) design, nothing else...
@zytechnology3 жыл бұрын
Thats funny , I answered first , Und ich bin auch von Deutschland hahahhahaha
@gregorycatullo35113 жыл бұрын
That was a great explanation on your part and a cool insight to how that relation can be the difference of a component falling off or withstanding high impact forces.
@raffaellobottoni8713 жыл бұрын
To this highly respected analysis, we can also add low quality eutectics, and perhaps little cleanliness in the process line.
@ChaseMyRabbit3 жыл бұрын
The new ipad pro comes with a solder iron and a bag o coils, apple innovative technology :))).
@razer1923 жыл бұрын
Bahaha 🤣
@no_one_gaming81843 жыл бұрын
But need to pay 1000 dollars extra and service will be done only in apple store .
@grooyo3 жыл бұрын
Yeah, but you must pay separately for iron, iron tips, power cable, solder, coils...
@gj37rameshahirvlogs3 жыл бұрын
ha ha ha
@electronicengineer3 жыл бұрын
Apple's interpretation of "Right to Repair". The customer has a right to repair Apple's screw ups only! Fred
@RR-SF3 жыл бұрын
Years from now, NorthridgeFix fix: “we have here an apple car for no power, oh look at that, all the coils fell off after a speed bump”. Haha #applefail
@em0_tion3 жыл бұрын
🤣😂
@marbat18543 жыл бұрын
Dont worry you need to wait 4 years after first apple cars on road, and there will be a lot more fun then you can imagine
@xlwirelesselectronicrepair3 жыл бұрын
Sound about right
@ZaConte3 жыл бұрын
😂😂😂😂
@electronicengineer3 жыл бұрын
🤣🤣🤣🤣
@reeread3 жыл бұрын
Great video, now I know where all my missing screws go. I will start looking in the 9th dimension from now on. Thank you for a great video showing the flaw in the iPad Pro 10.5
@anhtuanrena3 жыл бұрын
"better than factory" is exactly in this case. My job nothing relate to what are you doing but i can watch you solder many hours continuously, your skill is fantastic. Keep up the job !
@mikicastevanovic98713 жыл бұрын
I would like to thank you for your channel. I learned a lot of things especially how to connect the wires when the battery connector is damaged. God bless your family and you. Greetings from Serbia. Thanks again for your hard work.
@ashleynery80923 жыл бұрын
Can i suggest a spin off channel of Big Boss showing us how to strip down all this stuff before he gives it to you and maybe even a reassemble?
@dkaytan3 жыл бұрын
Good idea. Always wondering how some devices are taken apart.
@robinliljedahl52593 жыл бұрын
Big boss maybe doesnt like camera
@sulzata893 жыл бұрын
And will be hard to sustain both channels
@Keo3 жыл бұрын
just use google, or search on youtube.
@djbany243 жыл бұрын
Hey brother, you are the best. I appreciate you. I run repair shop in south america (Colombia) and its been challenging. Your videos have shown me a lot and i hope you family business thrives. However I am not a pro at board level repairs, but I can defend myself. Pleasr keep up the good work!!!
@stefcampagna23213 жыл бұрын
You have repaired many coils, but due to the quality, perhaps additional coils will be broken in few months and perhaps the customer will say in few month that you have done a bad job :-( I hope you will advise the customer about the bad quality of components ! Very good job !
@eddierohdes10993 жыл бұрын
True north ridge I hope you let’s the customer know about what going on... in case others comes out which Dey will in time to come
@SURGE1013 жыл бұрын
It’s such a common issue with this model that it has to be a manufacturer issue with the coils on this model. Apple probably used a different coil supplier for this model and there a defect with them. Great video as always👍
@justanormaluser15353 жыл бұрын
My personal iPad had a similar issue. My friend who does micro soldering, opened it. It was never opened before. Yet, a chip was glued on with super glue. It’s insane how unprofessional that is.
@gregorycatullo35113 жыл бұрын
No way. That is amazing! In just the sense I'm flabbergasted myself
@navorski76603 жыл бұрын
Coils probably get hot and cold rapidly which ends up cracking. Or maybe high temperatures cause it to expand and crack/get loose . Or maybe a shock caused by dropping the tablet caused broken Coils.
@aqib20003 жыл бұрын
But multiple destroying simultaneously?
@looukasst.773 жыл бұрын
thats exactly what i thought, apple doesnt have the best cooling methods generally😂
@sharfazhameed63823 жыл бұрын
You are a genius and a humble technician
@zytechnology3 жыл бұрын
The metal of the coils is unable to handle the thermal expansion of the coil itself during operating temperature and cycling on off.
@manolillo1233 жыл бұрын
totally correct
@g.pearson4726 Жыл бұрын
Ill be calling your company tomorrow. Im hoping you can repair my iPad pro 12.9 Apple store was zero help and after every time of taking my iPad t the apple store my iPad got worse now its won't even allow me to log in Thank you for your video and for what you do
@RolandKoller903 жыл бұрын
It flew to the 9th dimension 😂 gets me every time.
@BitRepairs3 жыл бұрын
Thanks, I would have never considered looking for loose coils like that, new thing for me to check.
@deent5186 Жыл бұрын
Awesome, Alex!
@haddaphone72663 жыл бұрын
So luckily you found the 9th dimension! Thanks for that.
@carstendahlhjarup87833 жыл бұрын
Each pin of the component lack mechanical strength, because only about 30% of the length is connected to the rest of the pin.(look for copper color at 2:57. It means that 70% of the length is the solder providing the strength. (look for copper color and tinned area on the broken off pins). Would be interesting to check for this gap in the pins on older coils by using wick. reason: 1 cost down measure 2 make bending of pins easy
@nathvanvolsom52133 жыл бұрын
You’re right men! Would it be a good reason to do weak legs like that? To maybe give « elasticity » to the component for temperature changings..? I hope so 😄
@jfixph36123 жыл бұрын
everything you do is amazing 💯
@davebollinger88633 жыл бұрын
What you got there is a batch of crappy inductors. Love the show. These chips are showing up in guitar and bass Amps as well as other PA and stuff like that. I can just imagin the fireworks when the ninth dimension is somewhere in the power supply. Thanks for the lessons.
@klevrepairs3 жыл бұрын
I guess the problem with this tablet it begins months ago when only 1 coil begin to crack, all the other coils are made with the same material as that first coil. So i guess is just bad material of the coils. Great video i always watch your videos, i mean every single one. :)
@tsbeech3 жыл бұрын
Love your videos Alex!
@RolandW_DIYEnergyandMore3 жыл бұрын
Luckily those 0402 components are not falling off in masses :)
@blazetechstuff3 жыл бұрын
maybe the coils cant discharge when not in use? sometimes a diode is used to give it a path to discharge.
@HazeAnderson3 жыл бұрын
I like this theory. ☺
@archie67023 жыл бұрын
Cheap quality coil legs that's the problem, why else does it happens in all such tablets. Love from India 🙂
@Fixmyphonesaket.3 жыл бұрын
Hey bro
@pow96063 жыл бұрын
Probably underspeced / under engineered cost saving that back fired.
@peekpt3 жыл бұрын
My guess is bad material used on coils the legs. It is breaking right on the solder edge. The solder melted the thin sheet of metal creating a weak edge
@gamerelated388710 ай бұрын
that contaminant on the surface of all those coils is interesting. I have a feeling that has something to do with it. It almost looks a little like corrosion. That crust you scraped off of the 2 caps at the beginning of the video is a byproduct of whatever is growing on the tops of the coils.
@jasperlongman76683 жыл бұрын
Good work dude!!! I wonder, the quality of the replaced coils is the same, how long will they work?
@realevostevo3 жыл бұрын
Odd that the pattern seems isolated to the 10.5 inch model. According to wiki those particular models released in 2017, so they're not that old. I guess there could've been a large batch of coils with weak leg joints or something during the time. It can happen, I remember Sony's noise cancelling headphones having issues with the early models due to weaker plastic being used in manufacturing which was causing headbands to snap after only months of regular use. But yeah, it just seems like too much of a coincidence that rough usage and dropped tablets would be the culprit here.
@Mariooooo3 жыл бұрын
This Problem could cause the lead free solder. We had the same Problem with Varistors. The Material of the coils is not compatible with lead free solder. I do not understand this but its a chemical process over time.
@richardlyd74503 жыл бұрын
Coming off board because of Drop shock!....also when you replace coils could you glue down with SMT (red) glue?..
@driftyprince3 жыл бұрын
Happy Ramadan bro!
@ARTaudio4403 жыл бұрын
Great Job👌 Maybe that coils have a production issue particularly in that serries Model of ipad. Quality is imperfect that needs to be improved.☺️😁 Or Apple itself has an issue in the making of that Model where might be luck of adhesive underneath of the coil🤗
@esdaudiodarwishholding94303 жыл бұрын
Agreed with you brother
@BHSAHFAD3 жыл бұрын
The use of an inductor is to resist a change in voltage, these inductors are usually placed on the output leg of a buck converter.. I would guess that these circuits are spiking past the max current load of the inductors, I would go further and guess that the magnetic field generated by these inductors are possibly physically moving the entire toroid inside the inductor ever so slightly on the legs, causing metal fatigue.
@azashukri53223 жыл бұрын
Maybe it’s due to the usage style. If an angry kid bangs on it the screen, the coils go flying
@southerncharity79283 жыл бұрын
Starving angry kids could have eaten those coils
@FixTronics3 жыл бұрын
You need to measure the good coils and write it down along with its location on the board and order a dozen of those coiles
@ronaldbalusdan41363 жыл бұрын
it is ment to be destroy,now a days lot of semiconductors are fragile they easyl breaks and company loves that
@christopherkidwell98173 жыл бұрын
Why would they 'love it' when it means more possibility of a class action lawsuit if many devices are having these issues?
@kertanegara9113 жыл бұрын
i love flying to ninth dimension, coils said
@FG-Supercharged3 жыл бұрын
It seems all the loose/broken coils have what looks like heat damage on them - darkened, mottled tops. Perhaps those coils get hot for some reason (bad quality, too thin wire, bad internal connection) and through expansion and contraction the legs loosen their mechanical grip on the coil housing and start to come away and break.
@daveaster19613 жыл бұрын
Designed obsolescence or the springs they used are are just too big for the coils.🤔
@adrianbestboy983 жыл бұрын
1:20 that coil went in 9th dimension😂
@pow96063 жыл бұрын
or the 9th dimension went to the coil 🤣
@markburton33063 жыл бұрын
Very weak coils. I’ve worked in the mobile space and I’m surprised that the weakness has not been addressed. Clearly they need to turn up the drop test machine
@robwebnoid57633 жыл бұрын
I'd say two things why the coils are breaking their legs is 1ST, obviously this seems like a coil manufacturing quality check ... and 2ND, i've never been inside an ipad case like these so i don't know how the circuit board is protected inside (if there is an inner foam pad over the board) & as i think that since the coils have a little more height on them, they are prone to being first hit by the case due to outside forces pushing down on the case, while the rest of the components are shorter in height so they are not getting hit from their tops. Other than that, the comments about temperature cycling on the coils could also be an issue. But again, i think as some other comments have said, this has to be some sort of coil manufacturing issue.
@corgommers87253 жыл бұрын
Coils that break off by themselves... very strange indeed! Although i used to work with much bigger coils in amplifiers etcetera...I have never seen such poor quality! Thanks for the informative video's. Greetings from Belgium
@phillipsvanderwesthuizen8003 жыл бұрын
It could be a function of the material, construction and heat cycling. It seems that each lug has two smaller supports that goes to the chip. The material used is probably copper or a copper alloy. Due to expansion and contraction during heat cycling the two smaller connection has to take up most of the flex and would work harden, fatigue and snap off. It could be that the component is under stress due to the manufacturing process (the solder solidifies before the component cools down and shrinks putting stress on the lug, using tin solder which is harder and higher temperature could exasperate the effect). I have no proof just a theory.
@andrasszabo73863 жыл бұрын
SMD glue should have been applied under those coils in the factory.
@dazzkhan22993 жыл бұрын
IF THE COMPANY MAKE SUCH STRONG AND UNBREAKABLE ITEMS, THEN THERE WOULD'T BE ANY JOB LEFT FOR REPAIR SHOP...NEXT DAY YOU WILL SEE THEM AS (SOUTHBRIDGE ICE SCREAM SELLER)
@059moatsem3 жыл бұрын
Great man and a nice job
@ericpvk2 жыл бұрын
the faulty coils get britle from the heat and fracrure when the tablet gets dropped or shocked. I'm totally guessing.
@bazj53923 жыл бұрын
The inductors are probably running at max rated current, cooling and then cracking, some of them do look baked
@mohsentabouna64013 жыл бұрын
as you can see the color of the coils change from one to other and that means they are going through heat cycle and that's excatly what's happening since coils have internal resistance and once they are hot and you drop the tablet they break. why coils and not other components? because 1 quality and 2 coils are made of ceramic and they have a big mass compared to everything else. the kinetic energy is dispersed through them when the device is dropped they get disconnected. now why this issue is happening more frequently on the bigger models? well it's obvious since the iPad is bigger > while it drops it has more energy that in turn has to dissipate through components
@mohsentabouna64013 жыл бұрын
also coils are not very different, I mean they don't have many values usually there are 3 sizes, so you should have 3 packs of coils that you choose from instead of using donor boards every time, it saves time
@mohsentabouna64013 жыл бұрын
Ramadhan moubarak khouya
@Benishraj3 жыл бұрын
I have same experience on iphone x.. customer dropped the phone.. no screen damages or any physical damage from outside, but baseband chip lose the connection.. and some components were dropped inside... I feel the same when i saw that.. but i fixed that iphone x.. but anyway apple is losing their quality on hardwares..
@misfortune50073 жыл бұрын
I think the coils are heavy or just vibrate when handling the device and the legs are too thin to handle them. On the other hand these coil could have legs made of a material that cant handle repeated heat cycles and the metal becomes britle and cracks. I've come accross in an nxp chip on a peugeot 407 key and couldn't figure out why the key was working intermitently. After doing some measuring and checking the traces make a good contact on both sides of the board I said its scrap but just wanted to try reflowing all the components. So i did a better one; I removed all the component, cleaned all the solder and resolderd all the components. Still didn't work. So I said that i should retouch the nxp cip since flux was of visible medium to low quality. When retouching the nxp chip, al leg came off flush with the chip. Tooke me while to dig though the cip to solder a jumper and after I did, the key worked without problems. Still no problems after 1 year.
@HazeAnderson3 жыл бұрын
But that is what coils are suppose to do right? Spring back and bounce off!! 😂 BOIIING!
@KostasLarkou3 жыл бұрын
Hello from Cyprus.. How can we fix such a problem without having a donor board. How to find the correct coil?
@gio00423 жыл бұрын
You need a schematic that tells you the coil value and an equivalent coil of course... With apple products it's easier because schematics are widely available
@fawadshahidkhokhar3 жыл бұрын
You are awesome man. Love from Pakistan
@manolillo1233 жыл бұрын
goes through contracting and expanding many times with changes in temperature
@pow96063 жыл бұрын
Are those coils burning up or something. Every broken coil has lots of pitting (or whatever it is) on top. There are other not broken coils that shows those signs too.
@kevinglenn19643 жыл бұрын
Legs might be too thin for the bends and the weight of the coil that it pulls the coil towards the board.
@topgame43803 жыл бұрын
everything you do is amazing thnx
@TechUniversity13 жыл бұрын
FLEW TO THE NIENTH DIMENSION!!!!! I LOVE IT !!!!!!
@boostyourproductivity50793 жыл бұрын
I guess the current flow is too much for the coils which make them too hot that they can't handle it.
@ItalianRetroGuy3 жыл бұрын
I want a "It flew to the 9th dimension" shirt
@stevenorfolk19143 жыл бұрын
i think that apple had a major issue on their production line when making that model and the 9.7 inch. weired that it is only the coils though which would point to substandard componants but, you are replacing with the same from doner boards which takes me back to my first thought as i bet you have not had any returns on a ipad with this problem you have fixed due to poor work, i am learning very quickly watching your videos, i have watched everyone you have done, wish they were longer though lol,
@donnierobertson30883 жыл бұрын
Nice job and video like always
@ford15463 жыл бұрын
I can see rust (2:47) which indicates that very bad metal has been used! it is rust that causes this! solder legs should be made of stainless metal and the coils should be glued to the pcb.
@itsmee97793 жыл бұрын
So without a donor board this wouldnt get fixed as each coil is different ? there are no markings so how would you know what values ? what happens when u run out of donor boards ? no more fixes ?
@siwoosable3 жыл бұрын
Got exactly same problem here but no donor board 😞
@aelaan123 жыл бұрын
Aside from the quality of the components I sincerely think the abuse some of these devices go through plays an important role in the lifespan. It is not that they are dropped by accident but are thrown somewhere on purpose. I think I also observe a small crack in the glass at the right top of the screen and I can see a few dings on the frame... While this doesn't mean components should come off a board it certainly reduces the lifespan of the device by the way it is treated. Once one component pops off it is not hard to imagine that the variables in the board change.
@Th3OmegaPoint3 жыл бұрын
I'm guessing cheap components and shock from being dropped. It might be worse on the larger model because they are heavier = more shock.
@tolis61463 жыл бұрын
I think it happens due to expansion by temperatures
@alexchong19793 жыл бұрын
I wonder the same thing...Or it was fall or bang something while hot temperature on the coil...
@sylviasimms73369 ай бұрын
Who do you take it to to be fixed? I have the same problem.
@Knightliner693 жыл бұрын
Would say that’s a mechanical issue with bad quality coils. Breaking apart when the ipad gets dropped or handled a bit harder than usual. Most likely in the future they going to cover those parts in some kind of rubber coating to minimize vibrations which makes the whole thing more unrepairable or harder to repair :(
@sajalhalder19623 жыл бұрын
I believe I can fly.... -coils:we can🤣🤣
@thorsaquatics63102 жыл бұрын
Question: can you solder the broken piece back onto the leg??
@jasonudall86143 жыл бұрын
Would be interesting to compare batch codes good to bad. These all seem to fail in the leads.... One wonders if apple had duff batch delivered but then that would be all of one value...also are all defects north+south or east+west indicating shock in that direction. But then what do we or apple care about quality. Its only got to outlast warranty 69 percent of the time
@MrOrangeman183 жыл бұрын
If this is a reoccurring issue then maybe apple should either charge suppliers or glue them down like they do with a lot of ics
@johny12203 жыл бұрын
I think the tablet maybe fell hard on it’s back, so that force, plus the coil legs attached to the coils themselves probably being too weak and heavy, caused them to break off/ get loose inside of the iPad. 😄
@mustaphahammad11962 жыл бұрын
Thanks for the video sir
@davidlguerr3 жыл бұрын
The coils may be of lower quality, however they did not broke by a miracle of God, the tablet was most likely dropped onto the floor at some point.
@WarPhotographer19743 жыл бұрын
Those coils seems to be getting pretty toasty, maybe that’s why?
@sevagtankabalian913 жыл бұрын
Dear friend it could be a bad production batch of the coils or inductors used during the process of making the ipads, and few drops by the customers makes things happen faster👌😉
@blinkq88213 жыл бұрын
Better than the factory😆
@adrianbestboy983 жыл бұрын
i think those aren't good quality coils and the material is cheap and after a drop that cheap material breaks off because in the factory products aren't verified in all of the conditions they only inspect the boards to see if the components are there and go to the next board
@Androidcell-u53 жыл бұрын
Muito bom o vídeo, Parabéns 👏👏👏🇧🇷🇧🇷🇧🇷 saudações do Brasil
@andrewstewart87043 жыл бұрын
They say that if you surround yourself with enough i pad 10.5's, the gravity of the coils will pull you into the 9th dimension 👍
@JJ21lives4ever3 жыл бұрын
9th dimension. I like that, it is like two times as obscure as the 4th dimension
@turgayatli3 жыл бұрын
Hi from Turkey! Hayırlı işler.
@suryavanshib3 жыл бұрын
Awesome ✌🏻✌🏻✌🏻 Due to bad quality of coil✌🏻✌🏻✌🏻
@mforrest853 жыл бұрын
I'm guessing the size and quality of the coils.
@thorsaquatics63102 жыл бұрын
How much is charge for something like this
@raulmorel18723 жыл бұрын
The issue is for bad soldering.
@SheltonCyril3 жыл бұрын
Well maybe the coils themselves are of poor quality? What if you took off healthy coils, made measurements and ordered just the coils? Maybe you get your hands on better quality parts and might not get a revisit because the coil you fixed also was defective. As an added bonus you don't need to rip it of donor boards.
@MrYerak53 жыл бұрын
Would be quicker if you used the doner bouard
@Frangkydewata3 жыл бұрын
hello, where did you buy the donor board?
@ajinkyabandagale22213 жыл бұрын
2ads at start, 4ads in middle. Ads are more than video.......KZbin is dumb
@alstajuana95663 жыл бұрын
What type of flux are you using?
@nauticalpirate3 жыл бұрын
It maybe cause because it falls hard or maybe throw away by the baby or maybe because of playing game that may cause it heat alot.
@triadwarfare3 жыл бұрын
I wonder if some Chinese factory could just make coils for this specific repair instead of relying on donor boards to get this fixed