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Released September 22, 2017. Model A1863, A1905. Available as GSM or CDMA / 64 or 256 GB / gold, silver, and space gray.

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iPhone 8 won’t turn on, need charge icon flashes and then unresponsive

So I have an iPhone 8 here that won’t come on and the “battery and cable” icon flashes once for about half a second. Then the phone becomes completely unresponsive. I’ll save the time and just say I’ve narrowed it down to the motherboard. When I first received the phone I noticed that a component the RV3C002UN was torn from the board. I replaced that and noticed a diode next to it, with greatly appreciated help from Minho, I have identified and changed this TVS (ESD202-B1-CSP01005). Now all it does is flash the “cable and battery” icon once for about half a second and quits responding. I am at a bit of a loss as to where to go from here, could anyone please tell me Where I should go from here?

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When i read the title, my first thought was just to clean the contacts on the connector, and carefully inside the device connector also, with some good isopropyle or another tech cleaner.

i’ve had numerous connectors do strange things if the contacts were dirty, like on magsafe MBP power connectors

but i digress, you are obviously way deeper into this already. :)

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Oh yes, I have already tried all new general hardware (battery, screen, charging port) and have went to the board looking through caps, mosfets and diodes. I’m just hoping it’s not some kind of inductor. Anyway, I’ve learned quite a bit in the recent past few weeks but am still unsure as to exactly what’s wrong with this device. If you could maybe point me in the right direction I would greatly appreciate it!!

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If its not sOmehow software related, i'm assuming you have exhausted all those possibilities, then it may be the usual catch-all board replacement treatment. but i'm also guessing you are avoiding that, understandably.

your knowledge of the individual bits on the board are intriguing, and commendable, however, i'm getting the feeling there may be no other choice but to search up a new board/ half broken ebay special' that you can salvage.

I might add that the world needs more people like yourself investigating the detailed workings of ultra micro devices such as this, perhaps you will find yourself opening a repair shop one day in your area :)

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Well I have opened my own shop here years ago but unfortunately I cannot fix all the issues they come in with (screens, batteries, charging issues, etc.). The worst feeling ever is having to say, “I’m sorry but I can’t do anything, you are gonna lose everything on your phone/laptop.”

I just want to help my customers to the best of my ability. Unfortunately, my ability has too many limits, so I’m trying to expand my ability to board repair. I can replace components and chips with ease but locating the problem is significantly more difficult.

I’m looking to collaborate with like minded individuals, who want to help people. If your willing please email me at BlakeD89@gmail.com and I am more than happy to share what I have learned and what I am trying to learn. Please message me if you are interested.

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I knew it! I sensed your jedi abilities though the force.

Honestly, i have considered opening a repair shop one day, i grew up around non stop tech stuff, and i'm very interested in the inner workings of .. well everything. I have learned so much in recent years from helping friends and family fix stuff, especially the ubiquitous 'My laptop doesn't work' and it just hurts to see ppl give up on machines (and all sorts of other stuff) that only need some little thing done to fix them.

I've watched many videos on all sorts of fixes for stuff, and of course - Louis Rossmann's channel on YT, and i think one day i may just dive in and do it!

I can see there are 2 major hurdles though, i'll need to save some mad money to get some good equipment, mostly because i'm not to keen on getting investors or a huge loan to start, i would prefer to get most of the basics paid for upfront. Also, as i've leaned there is a huge political battle of sorts to even allow people to do it, which i think is silly - full stop.

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1 Answer

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In reference to my Help identify iPhone 8 logic board components to your earlier question, have you properly identified which component is missing? The two square components are the MOSFET’s and the two smaller, rectangular ones are the TVS diodes. The thing to note is that the two I2C0 lines that transmit battery data go through those components. They have to be replaced and you should be probing them to insure they aren’t shorted to ground or not connected (open circuit).

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