iPhone 12 Pro Max no power, not charging, shorted capacitor C1800 - Advanced Motherboard Repair

Here we have an iPhone 12 Pro Max that has no power and not charging. The problem was a shorted capacitor on RF board (C1800). I just removed that capacitor and now the phone is back to life. The hardest part was the reballing process and cleaning the boards. That unleaded solder is not good to use on consumer devices.
Some of the tools and supplies i use all time
Sugon T26 soldering station with JBC C210-018, JBC C210-002 and JBC C210-020 tips
Gordak 952-A (I'm using this only for it's soldering iron)
8858 Hot Air Station (no name)
Seek Compact XR Thermal Camera
Sunshine DT-17N Multimeter
HY3005D Power Supply (very old)
Kingbo RMA 218 Flux
Baku BK-227 Flux
Cynel Soldering Wire 0.5mm and 0.7mm
Mechanic XGS40 158C Solder Paste
Relife RL-404 138C Solder Paste
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[@batmantroll6995]

I discovered an easy way to open the new iPhones 12-14. All you need is a suction cup and heatgun. You just prep the bottom area with some heat for 5-8 seconds. Then put suction cup at very bottom edge and start pulling with firm steady pressure and HOLD the pulling, for about a minute until you see the lcd gap open. Once you see the gap, you use sesame blade to open the rest.

[@SC70098]

Great video! I would like to know if repairing the motherboard, will data get wipe out?

[@PhoneRepairRO]

Data will remain! Thank you for your comment!

[@amzolyonad10]

Merci beaucoup depuis senegal 🇸🇳

[@Jameelahme2345]

Great boss

[@mohamad-qh5px]

Awesome hands thanks Invisibile one 😂😂😂

[@ThatDIYguy862]

how much power do you add to a circuit line? and can it be the same amount of power to any circuit that you find a short on?

[@JohnWilliams-zo5jf]

Great video❤🔥 What flux are your using?

[@PhoneRepairRO]

Thank you! I'm using Kingbo flux - here it is: www.amazon.com/Kingbo-Flux/s?k=Kingbo+Flux

[@JohnWilliams-zo5jf]

@@PhoneRepairRO Thanks

[@rickmucci4785]

Hi! Amazing video! Do you have a repair shop?

[@PhoneRepairRO]

Hello! I don't have a repair shop. I do this as a hobby!

[@rickmucci4785]

@@PhoneRepairRO 😔 Looks like these iphone12 are all garbage. Mine doesn't power up and overheating. Tried everything. Don't know if I bring it to Apple if they will warranty it

[@PhoneRepairRO]

@@rickmucci4785 You might have a short on some nand line or somewhere else. If it is under warranty go to Apple ( i hope you have some backup on icloud or on your pc ) - they will give you another phone. If not, go to a repair shop that do microsoldering ( all will say that they do microsoldering - look on reviews ). Where are you from? Maybe i can recommend you some repair shops! Have a nice day.

[@rickmucci4785]

@@PhoneRepairRO Thank you so much. No warranty, just heard that since they had problems with these things that they might do the work for free as a recall or some but I think it won't happen in this life time 🤷 Montreal,Canada. Can it be a capacitor?

[@PhoneRepairRO]

@@rickmucci4785 If they don't have a recall program, not a chance! It's a 50/50 the thing with the capacitor, but you say that is overheating - that means the phone try to power up till a point - there are some power lines that come on after you press the power button / or you promt to boot with the charger - so it might be a short somewhere. You can send your phone here www.ststele.com/contact-us/ , the shop is in Sarasota / Florida / US (much closer to you than Europe / Romania). Jason is a guru in this industry, is the guy that made Apple to recall all iphone 6 / 6+ that had "touch disease".

[@easyfixranau]

I have same problem,but this line is ground,i do same in the video but dint see the short

[@TTT-V]

Nice !! how much voltage did you apply?

[@PhoneRepairRO]

Hello, I injected like 2v at 2amps.

[@ThatDIYguy862]

what program did you use to see all the motherboard info?

[@PhoneRepairRO]

I'm using Wuxinji, but there are many programs that do the same thing!

[@ThatDIYguy862]

@@PhoneRepairRO thank you for your response. I have a few questions if you don’t mind me asking. I have a 12 Pro Max that was boot looping due to storage full, I tried to restore or update, fix flash on 3u tools, I unplugged everything on motherboard except battery, lighting port, and power button, nothing gets it working. Now computer sometimes reads the phone in dfu mode and most of the time there is a usb error saying it doesn’t recognize device, the phone takes a charge at 0.438 amps but nothing showing up on screen, have you dealt with this before? what could it be? Also at 3:41 I see you are checking from the battery point J10000 to another ground point on the upper motherboard and say there is no short anymore, how is the short gone when you are reading from a ground point from battery connector to another ground point on the motherboard? Also, what points on the motherboard do you apply power to see if something is short circuiting without shorting anything else? Is it power and ground in a certain circuit? The circuit lights up where powers and ground is for a particular component in Wuxinji program, sorry for the long comment and questions but I’m just trying to understand, thank you.

[@PhoneRepairRO]

@@ThatDIYguy862 Noo, at min 3:41 i just read the resistance of my multimeter leads, then if you look till min 4:00 you will see that i measured on the + terminal ( i know, the text on the screen is a bit off - i will start to make videos with voice in future ). I normaly apply voltage / current only on vdd main, but never on battery conector ( on 12 / pm vdd_main is conected to battery connector with a .0025ohms that might blow up ). Wuxinji and other programs lights up all components that are conected to a certain line ( ex vdd_main, pp1v2 and so on ). To find where is vdd_main you go close to PMIC and there will be lots of capacitors conected to vdd_main - never go up with amps! Regarding your problem, the phone now is in dfu. Have you put the motherboard in another known good case? This will be the first step! Have a nice day!

[@ThatDIYguy862]

@@PhoneRepairRO What should the resistance value be when connecting one lead to number and the other to number 4 of connector J10000 (battery connector)? Power pin to ground pin is what it that is. I am getting a resistance reading but I am not getting a continuity reading on it. And do you have any idea what on the J11200 connector circuit would case a short or something so that computer cannot read the phone?

[@ThatDIYguy862]

@@PhoneRepairRO I also found another weird thing, after I freeze the phone in freezer for 5-10 minutes, the computer start to read it again, when it warms up, it doesnt work anymore again, you think something is shorting it?

[@KhalidYaqoobi-f5d]

Make a video on fault finding

[@cooleditzzz69]

Nice

[@noorsyazwanrohizad2556]

What schematic are you using sir?

[@PhoneRepairRO]

This one: english.wuxinji.com/

[@luisek.284]

Isn't it generally necessary to replace a defective capacitor?

[@PhoneRepairRO]

Not always. This one was on main power rail VDD_MAIN. There are alot of other capacitors on this line!

[@shaikhrehman7649]

Brother same phone I have and the problem is also same no charging no switch on.. Plzz tell me bro the cost of repair?

[@saeedsamikhan5691]

which prob to connect to the line and which one to the ground ..always confussing

[@PhoneRepairRO]

If you inject voltage - always red probe ( + ) to line and black probe ( - ) to GND. If you measure in diode mode always red probe ( + ) to GND

[@rangerover6049]

how much cost the repair same issues with my 12 pro max peso im from 🇵🇭

[@mishal248]

👍

[@marvijeremen2164]

How much to repair

[@marvijeremen2164]

12pro max

[@mkfixethio]

which stencil u use?

[@PhoneRepairRO]

It is something from QIANLI - 10 in 1.