iPhone Rebooting every 3 minutes (Mic 1/Thermalsensor)

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iPhone X

Released November 4, 2017. Model A1865, A1901. Available as GSM or CDMA / 64 or 256 GB / Silver or Space Gray. (Pronounced the same as "iPhone 10.")

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kbrown488 @kbrown488

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Posted: Nov 27, 2021

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iPhone Rebooting every 3 minutes (Mic 1/Thermalsensor)

My old iPhone X that I have had since it was released has worked fine and was handed down to my son. About 3 days ago he said he woke up and was using it and it kept crashing. I did a lot of investigating and wiped it multiple times, tried beta iOS, read through the log files, which reference Thermalsensor and “Mic 1”. I also took it to Apple store and they said they *believe* it was the motherboard. I did take the screen off and discovered the moisture sensor on the underside of the screen was pink, but every connector on the phone looked brand new and spotless and I did not see any corrosion anywhere.

I also found the program callediDevice Panic Log Analyzer today and when I run the logs through it it says the possible issues are:

“Power Button Flex” and or “Charging Port Flex”

Other info from the log:

panic(cpu 0 caller 0xfffffff013ff70f4): userspace watchdog timeout: no successful checkins from thermalmonitord since load

service returned not alive with context : is_alive_func returned unhealthy : current 73fffffffff, mask 67fffffffff, expected 67fffffffff. SD: 1 BC: 1 Missing sensor(s): mic1

I’m interested in repairing it and trying to sell because I already ordered my son a new phone.

I have the following items in my cart. I just wanted to see if these are the right ones to start with or if it could also be the ear piece? Thanks.

iPhone X Lightning Connector AssemblyIF377-004-1

iPhone X Power Button and Flash CableIF377-002-1

and maybe i also need this?

iPhone X Earpiece Speaker and Sensor Assembly

Answered! View the answer I have this problem too

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Chris Stables @imicrosoldering

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Posted: Nov 27, 2021

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You can rule out two of those parts before purchasing. Disconnect one at a time and see if the phone acts the same.

1. Earpiece Speaker and Sensor Assembly.

2. Power Button flexes. “You can boot the phone with this disconnected by inserting the charge cable“

If it still acts the same I would replace the battery and charge port which should fix the problem as these are the two most common parts to cause this behaviour...

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Thanks for the advice. Can you provide me with a link that might identify where those connectors are?

Nov 27, 2021 by kbrown488 Share

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Thanks for the advice. Can you provide me with a link that might identify where those connectors are? — kbrown488, Nov 27, 2021

Joshua Ayo Adeyemi @joshuaayoa76155 Rep: 1 · Answer 1 · 2022-06-26T15:25:36-07:00

Joshua Ayo Adeyemi @joshuaayoa76155

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Posted: Jun 26, 2022

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Check the back board if it hasn’t open

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Julian Sinclair @juliansinclair Rep: 1 1 · Answer 2 · 2022-12-06T11:01:04-07:00

Julian Sinclair @juliansinclair

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Posted: Dec 6, 2022

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I think my iPhone rebooting issue is the earpiece/sensor lead. I just want to stop the endless rebooting!. I realise the face recognition won’t work. I guess I am asking if a replacement new or 2nd hand original cable will solve the thermal Mic /1 error in the dumped report on the phone

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Forgot to say, the phone doesn’t keep rebooting if I detach this flex cable.

Dec 6, 2022 by Julian Sinclair Share

@Julian Sinclair There's a Wiki article on this subject that points to the exact cause indicated by a kernel panic.

iPhone Kernel Panics

If your panic log is indeed showing a Mic1 error, that part is located on the lightning port assembly, not the earpiece speaker assembly, so it's a little bit confusing as to why disconnecting the earpiece assembly stops the rebooting.

If it was my phone, I would start with replacing the lightning port assembly. That's the part indicated, plus if you go ahead with replacing the earpiece speaker assembly you'll lose your Face ID.

Dec 6, 2022 by Jerry Wheeler Share

I have already replaced the lightning port assembly with an Apple replacement of eBay. The face recognition failed before this. The ear assembly cable is damaged anyway. I bought the phone, it worked fine then things started to fail. Face recognition then facing camera died. However the battery has basically been glued in so it tore out cable runs when the battery was lifted. There was evidence that the charge port had been wet at sometime. I bought a replacement back case and reassembled. Phone boots up and works properly for 45 mins facing camera now works but then reboots with the mic 1 error. After that it reboots every few minutes with the same thermal mic 1 error. This is the same whether the ear piece assembly is connected or not. Probably should consign it to the bin, but it’s a war of wills and I want to win!

Dec 6, 2022 by Julian Sinclair Share

Btw the earpiece disconnection didn’t stop the phone rebooting it just took a long time to reboot itself the first time

Dec 6, 2022 by Julian Sinclair Share

@Julian Sinclair I know where you're coming from; I'm still fixing things on a rebuilt X I worked on for my grandson. I got a used replacement housing off eBay myself where the only usable part was the lightning connector, but after he used it for a few days, he started getting kernel panics. Turned out the lightning cable had a bad sensor so I ended up replacing it, having to take the whole thing apart yet again to do so.

Anyway, your panic log is definitely pointing to that part, so I'm of the opinion you may have to just bite the bullet and get yet another one.

By the way, if you still have the original front camera assembly, you can replace just the camera and keep Face ID working. Here's a guide for the iPhone 11 Pro showing how to do it; just use the X guide for the front camera assembly to get it out.

iPhone 11 Pro Front Camera Replacement Without Losing Face ID

Dec 6, 2022 by Jerry Wheeler Share

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iPhone Rebooting every 3 minutes (Mic 1/Thermalsensor)

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