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!

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

The new ipad pro comes with a solder iron and a bag o coils, apple innovative technology :))).

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?

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

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 !

"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 !

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.

Let's name this issue 'coilgate' 👍☺️

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👍

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.

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.

It flew to the 9th dimension 😂 gets me every time.

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!!!

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

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

Maybe it’s due to the usage style. If an angry kid bangs on it the screen, the coils go flying

1:20 that coil went in 9th dimension😂

The metal of the coils is unable to handle the thermal expansion of the coil itself during operating temperature and cycling on off.

Awesome, Alex!

You are a genius and a humble technician

Luckily those 0402 components are not falling off in masses :)

Cheap quality coil legs that's the problem, why else does it happens in all such tablets. Love from India 🙂

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.

I believe I can fly.... -coils:we can🤣🤣

it is ment to be destroy,now a days lot of semiconductors are fragile they easyl breaks and company loves that

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.

everything you do is amazing 💯

So luckily you found the 9th dimension! Thanks for that.

SMD glue should have been applied under those coils in the factory.

Love your videos Alex!

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.

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.

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.

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. :)

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

i love flying to ninth dimension, coils said

maybe the coils cant discharge when not in use? sometimes a diode is used to give it a path to discharge.

Thanks, I would have never considered looking for loose coils like that, new thing for me to check.

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 👍

But that is what coils are suppose to do right? Spring back and bounce off!! 😂 BOIIING!

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.

FLEW TO THE NIENTH DIMENSION!!!!! I LOVE IT !!!!!!

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🤗

I want a "It flew to the 9th dimension" shirt

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.

Happy Ramadan bro!

Designed obsolescence or the springs they used are are just too big for the coils.🤔

Great man and a nice job

2ads at start, 4ads in middle. Ads are more than video.......KZfaq is dumb

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.

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.

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.

Thanks for the video sir

9th dimension secretly comes and grabs them

"Better than factory!"

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

Better than the factory😆

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..

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

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

everything you do is amazing thnx

Nice job and video like always

I think it happens due to expansion by temperatures

You are awesome man. Love from Pakistan

Apple hates someone fixing its products.

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.

Good work dude!!! I wonder, the quality of the replaced coils is the same, how long will they work?

Coming off board because of Drop shock!....also when you replace coils could you glue down with SMT (red) glue?..

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 :(

The inductors are probably running at max rated current, cooling and then cracking, some of them do look baked

better than the factory

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,

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

" gone into another.dimension".

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👌😉

at this rate you're gonna need a warehouse just for coils

Legs might be too thin for the bends and the weight of the coil that it pulls the coil towards the board.

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. 😄

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

I'm guessing cheap components and shock from being dropped. It might be worse on the larger model because they are heavier = more shock.

goes through contracting and expanding many times with changes in temperature

*9th dimension is full of spare parts*

Apple deliberately doing this 😒

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 ?

The issue is for bad soldering.

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.

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

Apple must be buying coils from lowest bidder.

the faulty coils get britle from the heat and fracrure when the tablet gets dropped or shocked. I'm totally guessing.

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

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.

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.

Muito bom o vídeo, Parabéns 👏👏👏🇧🇷🇧🇷🇧🇷 saudações do Brasil

I wonder if some Chinese factory could just make coils for this specific repair instead of relying on donor boards to get this fixed

Hi from Turkey! Hayırlı işler.

9th dimension. I like that, it is like two times as obscure as the 4th dimension

I guess the current flow is too much for the coils which make them too hot that they can't handle it.

Firstly it's quality of components and then I then it's excessive shocks and vibrations...

These two coils at 3:35 are suspect. They have visual damage to the surface of the coil. There is a saying that is something like "Mish mishkoum mish mithl..." that our Palestinian teacher taught us meant something like "Our apricots are not like your apricots" It was supposed to be an Arabic tongue twister. From what I remember similar to the Arabic translation of the English phrase "Can Can can a can?"