How to change chips with underfill, iPad mini Power Management ic
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- Опубликовано: 19 окт 2024
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Watched every second, great repair. Thanks again for sharing your knowledge
thanks so much Jessa, but i'm one of those no-ones (17:44) that watched whole the video to grab any technic from your videos, i would appreciate any word telling you that makes technics brighter , just can say THANKS
I watched it as well (at 2X, though)
4 years experience with repairs and you really inspired me to do board lvl repairs. finally got my boss to buy me one the the scopes you use and im giving this a shot. so far so good, just keep up the good work and keep the videos coming.
+arcil mendez thanks for the appreciation :)
Very helpful Jessa thank you for taking the time to do this!
hi Jessa very nice work. At the beginning of the video you mentioned two Caps were short but nothing else resulting PM IC failure. does this apply to the iphones as well?
thanks
The caps weren't themselves shorted. They were part of a shorted line--which was caused by a short within the PMIC, therefore any component on the shorted line will measure short.
Awesome video Jessa.... I've been playing with my new hot air station this evening, just messing around on old no good boards, removing IC's etc, tackling underfill - I also tried putting the chips back on, but I found that even with my air on the lowest setting, I can't just leave the chip to sit there without me blowing it away!! I wonder if its the flux you are using which is helping to stick the IC in place as yours doesn't seem to budge at all? Hot air is from Hakko FR-810 on the lowest air flow
My favorite show in the whole world!!! Your beautiful:)
Wow jess! Good job on this success. I did a iPhone 5S PMIC replacement and have failed miserably.
Jessa loves ic chip replacement.
+nails s lies!
How much exactly did you charge for this rescue, all included?
+Ernst Stavro Blofeld at the time $150 and now we only take this job for data recovery
Jessa Jones For Manhattan rent, that is INCREDIBLY fair!
I know you New Worlders hate to talk about money, but without information, nobody learns. Thank you.
If I ever travel to America, your number will be sticking on all my Macs.
Good woman. Carry on.
What is the bonding agent that holds that shmoo together? Pine tar? Bayonne NJ tap water? And, what solvent cuts that bonding agent w/o harming the traces or phenolic board? Ethyl acetate? Acetone? 7% sulphuric acid @ 48C? Or conversely, what is the shmoo's fill agent? Shredded cardboard? Digested avocado spinach smoothies? What is its flashpoint temperature? Who has a decent gas chromatograph app on their phone?
great work jessa this video is very helpful for me
Excellent walk through.
Hiya Jessa grate video , i am both confused and quite relieved that you did not worry about all the pads having solder on , how did you know those few pads where no too important ??? I have been informed ( obviously wrongly ) that every pad was essential , could you please give a little more info as to how you new they where not important ones !!!
If you don't see a torn trace leading to the pad either from the side or from below it is nc. Zxwtool can confirm
ok thanks for that Jessa very helpful, the Zxw tool i looked at briefly but i got quite confused as there are so many out there in china all offering thing i know nothing about , maybe you could give some classes in using it on line, hint hint ;-))
Do NC pads tend to lift more than the connected ones?
Really impressive work. Thanks for sharing.
+Misfit the mad thanks for watching!
Jesse, great video. Would you mind sharing what size the xacto knife is please. I'm still waiting for my 10 mil dental probe to arrive from the states to the UK. No such supplier of these to be found here :(
It's funny, we complain when Apple does not use underfill and and chips move and connections crack. But we also don't like it when Apple glues down chips, as they are difficult to remove. Remember all iphones are first generation models, so there will always be defects and experimentation by Apple. Plus millions of people make their living repairing these amazing devices. Thank you Jessa.
What's the purpose of the sideways rocking of the chip? I'm thinking when you do this the assumption is that the solder balls are already fully molten so the idea is to loosen the grip of the underfill before attempting to remove the chip.
ie the underfill holds the chip under tension, tends to suck the chip on the board
You can get some good flat blade tips for the JBC stations that are really good for underfill removal, im not sure if iv been them on Louis video or where it was, but they look really good for doing all the pads in one sweep. Im not sure if they make them for the Hakko stations or not, but I presume so.
you are absolutely brilliant.....>? where did you learn this technical....wizardry....?
Lots of time staring down a microscope, and lots of hours in conversation with friends trying to learn to do the same thing.
i am going to challenge myself....with this task...but i have to say the first video was ok but second was brilliant
Do you have any experience or thoughts on BGA IC adhesive removing liquid?
Great video as always. Have you ever taught of using a Dremel to remove the chips? There a light weight mini drill. I have tried it on large chips on scrap boards and it seems to do the job. Would like to see it tried using a microscope.
+costlydruid3 I'd love to buy a CNC machine, but haven't yet. On my research bench I'm messing around with some bigger chips, and I was just talking about seeing what would happen if I tried my dremel as a "Practical CNC" machine. Totally going to try it!
+iPad Rehab can't wait to see how it works out for ya. Would be a great video to help people. Thanks again for sharing the knowledge
+iPad Rehab You can get desk stands for them, in theory if you put it in a desk stand you could then attach the board to something flat and slide it from side to side. The worst part would be when you get down to the pads, as all of the machines I have seen use such fine tolerances you can literally shave the solder off the pads, but unless your board is 100% level you risk carving the board up, but its worth the risk on scrap boards to experiment !.
26:55 (im watching the whole thing), had to laugh when you said about checking if the shorts had gone, I had the same problem with what I thought was the pmu this week on a mini, removed it, cleaned up the pads only to realise that the short was still there.....turned out to be the wifi chip !, strange thing is the pmu was heating when applied with a current from dtps, but when the wifi chip was removed the short went away, very odd situation.
This problem we've seen before. Initially we removed the inductor to isolate the line from the PMIC and the short went away, except the inductor pad was still shorted. This means the short is definitely internal to the PMIC
What is the preferred and max temperature used with hot air? I have been searching for a while and cannot seem to find an answer. Any pointers would be awesome! Thanks!
Somewhere between 300-450c depending on the job. This always differs. iPad Rehab highly recommends the Quick 861DW bit.ly/2xGDTXo for a cheap, affordable, powerful hot air station with an easy interface. It will remove all different types of chips without a problem, unlike weaker stations that can't stay hot enough long enough to do the job.
If you remove the inductor and then inject the 3 volts into that line would that be enough for the ipad to boot, as doesn't the pmu generate other voltages for other chips on the board too, but out of different pins ?. Just trying to get my head round it, as when I look at the schematic there is outputs going to the cpu and all over ?.
+Iain Simpson yes, the battery is supplying the power to the PMU, which then supplies the other voltages
+iPad Rehab What did you mean about injecting the 3 volts for data recovery ?, wouldn't it need all of the voltages the pmu generates to be able to do this ?. Sorry for being thick haha, just trying to get my head round it.
Um. I've been messing with test boards in the last days, just trying to remove nands off board. God, i'm having a HARD time to say the least. I'm using 300 degrees, and still having issues getting them off. Last one i've pulled, i ripped resistors around the chip in black underfill around the nand. Frustrating.
What was the original problem with the iPad and how did you realize that changing the Power IC is the problem?
+Eduard Mokan Dead, no power. Will not boot from a new battery, and gets hot at PMIC. Caps on 3v3 NAND line out of PMIC tested short. Removing inductor to separate that line from the PMIC, and line was still short on PMIC side. This means short is in PMIC, replace to solve.
hahahaha that comment about Louis Rossmann made me spit beer all over my screen
Great Work
i wish i can get the same results someday
thanks for the great great great video :)
Watch a lot of your vids recently and came across this one, so just a question about others who do this repair. There was another board being repaired by an Asian firm and while their repairs looked successful I was surprised about the differences on the boards. No under-fill and the boards looked slightly lighter in colour. Watching them sometimes made me shudder by practically prising the power management chip off with a scalpel and using flux which was so stiff the hot air had to be used to make it flow, this after not cleaning the pads of the little sharp 'mountains'. So if you do watch other vids like this, do you laugh or shudder?
Oh, like the repair.
The only thing that makes me shudder is plzbro solutions on the internet
Nice one, you learn through watching and listening. Nothing better than watching something and you say 'dam that was good'. Comments are one thing but I realise when 'can you' is asked over and over again and its the same thing, you are working and time is important.
Thanks for the great vids, learning a lot.
How can you tell if an iPhone 6 has a shorted power management chip or if one of the smd caps are shorted? The ic chip gets super hot to the touch
+mrsemifixit remove the cap that you think is shorted and find out!
+iPad Rehab Problem is all the caps in that line test shorted to ground since they're in parallel. Removed cap by wifi chip that's usually the issue and short remains
It is pmic about 10% of the time
+iPad Rehab So would you remove one cap at a time and test if short is gone?
That can be a strategy, yes.
nice work>>>>>>>>>
I didn’t get it. Why the center it flat, not balls?
I still cant do this without lifting pads lol. That glue is SOLID as hell under the IC.
right?
If I had to make a guess, you are probably heating it too long and hardening the epoxy through crosslinking?
Hi, yes this chipset is horrible! For cleaning flux and remove glue, you can use, hight presure aerosol like "starnet". It's very strong and powerfull to cleaning, using in mecanic/electric industrie. I think that it exist solvant for take off organic glue. Is organic normaly. And i think, we can hot by the bottom for make easier. Sry for my glish! i'm frenchie
hey bravo lady which flux and microscope do you use for it please let me know the name and location Thank you
Hi! Thank you for your interest in the equipment we use.
I use several different microscopes here, including an Amscope microscope, that can be purchased at the link below.
www.amazon.com/gp/product/B005MRAAR4/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B005MRAAR4&linkCode=as2&tag=rossmanngroup-20&linkId=8c3b94523f849afcbb9e232f303e4670
For flux, I use Amtech NC-559-V2-TF mailin.repair/amtech-nc-559-v2-30-cc-16160.html
whitch type flus use plzzzzzzzzzzzz.................
+guru colegas ............which type past or flux use
plz get a better mic and apply noise removal in your video editor in order to get a better audio
+GabakTech - Cursos de Computación Gratis Honestly, what I want to do is make free videos when it is convenient for me, without spending hours doing editing and noise reduction or worrying about lighting or equipment. I have zero interest in doing this at a professional level. I am not making money off of these, it is a simple community service to the people of the repair community. If you would like my videos to have noise removal and a better mic, then feel free to come over here and set that up and edit as you wish. The door is open. If you want to donate that time, have at it. Every time I put up a video it pulls me away from my queue, from developing new techniques, even from being a mom. Every time someone complains about quality I wonder why I bother with this at all.
+iPad Rehab Its hardly fair that people should be poking things at you, these videos are fantastic and really do open my eyes too the repair industry, i don't care about how good or bad the audio is, its the information that counts the end of the day! so carry on doing what you do :) and ignore people who give criticism!
+iPad Rehab do u clean the place were the old chip was after u remove it and u put the new one on there or u just put it with out cleaning ?
+iPad Rehab also keep it up
+Ahmad Shablaq I do exactly what I did in the video. I left nothing out from start to finish on this repair.
Good job but i think you should clean more the glue before you put the new ic. I suppose to you to see the videos of ifixit.vn.
+Larbi Kamla why would I want to do that? It takes too much time as it is. If it works, it's done, no?
How I wish I could become like you
Buena tarde iPad Rehab, necesito de su ayuda!!!, ojala pueda atenderme!!
thanks for the practical. and for those negative flamers out there, it's like a mountain, climbed it because it's there; so many fixes / challenges result in a negative cash injection but positive "fuck you" cosmos.
Truth!
plus a huge magnifying glass
if you want me to help you with the videos you make i can do it free of charge. I can give you few tips
I got over 80k subs and i do computer repair but in spanish.
just let me know.
i live in USA, ky
Yay ! You know you bad : )
Пожалуйста, делайте субтитры, что бы мы могли переводить на другой язык)
The answer to the sex toy mini is right in the beginning of this video!!!
Badcaps.net forum linked to this. This thread has a link to a tech paper from an underfill mfr. They describe their recommended method for rework.
www.badcaps.net/forum/showthread.php?t=56510
Sent it to your email.
I apologise for my earlier comments, I stand by them but I never realised this is a hobby. not really my place to Comment, regardless how view it.