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Repair and disassembly information for the second-generation iPhone SE that was announced and released in April of 2020.

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iPhone SE 2020 restarting every 2-3 minutes, CPU 3 caller problem.

I dropped my iPhone, and it kept restarting. I went to a local repair store to fix it. The panic log was giving me the "mic1" problem, so he changed the charging port flex, but it didn't work. I returned it to the store, and he said that he didn't know how to fix it. Now, the phone is overheating and restarting, so I checked the panic log, and it gave me this: "panic(cpu 1 caller Oxfffffff012d176fc)".

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There may be more information in your panic log that can help us identify the problem. Please edit your question to add the first page of the log; cut and paste or screenshot will both work.

In the meantime, you can take a look at this page and see if it helps.

iPhone Kernel Panics

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Ok thank you, I'll do it right now!

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Your repair shop did the right thing in replacing the charging port; as your panic log clearly shows, the mic1 sensor is not responding. As Ted has stated already, it is possible your replacement port is either missing the sensor or it has a defective one. As such it would be worth your time to try another charging port assembly from a different vendor, but honestly I suspect it won't help. While I've heard it happening, in all the replacements I've done of iPhone parts, none of them has been missing a sensor causing a boot loop. So yes, it would be the best guarantee if you got a genuine Apple part, but personally I'd go with just getting it from a different source.

Once you've confirmed that the problem isn't in the charging port assembly, the only thing left is possible damage to the motherboard. Unfortunately that requires specialized expertise and equipment that a shop doing just screen and battery replacements wouldn't be able to handle.

Alisha ( @flannelist ), have we seen schematics for the SE 2020? I checked my set and all I have is the original SE.

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So. No schematics that I know of. Even after some folks broke encryption for one of the bigger paid databases (and a bunch of stuff made it out into the wild).

Second. I probably know what the issue is, it's very common on this model. But I'll post separately for annotation purposes.

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@flannelist Awesome, I knew we could count on you! :)

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In addition to verifying that the charge port is a genuine Apple one (if possible), the SE2 has a unique fault that commonly causes this. Especially since you dropped it before the issue began I am likely to think this is the one.

Basically there are three tiny little electrical lines on the logic board that run from the CPU under the SIM tray. One is for touch and 2 are data lines that go straight to the CPU—those are the ones that affect microphone. These 3 lines commonly break somewhere under the SIM slot causing this issue. It's one that can only be fixed with microsoldering and requires the ability to make a tiny little jumper wire to restore connection in this trace. It also commonly affects touch screens depending on which electrical line(s) break.

repair.wiki has a whole page dedicated to this issue and there are multiple youtube videos of folks doing the repair. I like this one by Jason at STS Telecom which fixes the touch screen issue, but the process is almost the same for mic, it's just a different electrical line. Many people preemptively fix all three when they do this repair.

Not every shop has a microsoldering tech on staff, but they may know if one if you ask. Even if the shop you took this to doesn't do those repairs themselves.

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It’s possible the repair shop fitted a aftermarket port. Sometimes they have some chips missing for it to talk to the board correctly. I’d fit a genuine part and then try it.

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