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== What Is a Panic? == | |
- | In terms of macOS, iOS and other Unix based Operating Systems, a kernel panic is an error the operating system encounters that it |
+ | In terms of macOS, iOS and other Unix based Operating Systems, a kernel panic is an error the operating system encounters that it cannot readily recover from. In many ways, it is comparable to a Windows Blue Screen of Death. It manifests as an unexpected shutdown, or reboot. |
If your phone is rebooting unexpectedly, there is a very good chance it's a kernel panic. You just didn't know that's what it's called. | |
=== Watchdog Timeout Thermalmonitord Missing Sensor === | |
- | Included in its system processes, iOS contains a regular check of sensor input. If it does not hear from these sensors within three minutes, it reboots the phone. |
+ | Included in its system processes, iOS contains a regular check of sensor input. If it does not hear from these sensors within three minutes, it reboots the phone. [link|https://www.ifixit.com/User/739239/jessabethany|Jessa] at iPad Rehab has done a [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|rather extensive write up] on this specific issue. |
- | |
+ | To get to cause, keep reading past the panic string to find the missing sensor. |
- | * ***PRS0*** and ***Mic1*** are part of the [link|https://www.ifixit.com/Parts/iPhone/Cables?q=dock|charge port flex|new_window=true]. |
- | * ***Mic2*** is in the [link|https://www.ifixit.com/Parts/iPhone/Cables?q=power%20button|power button flex|new_window=true] in most models. |
- | * ***TG0V*** and ***TG0B*** are a function of [link|https://www.ifixit.com/Parts/iPhone/Batteries|the battery|new_window=true]. For the 11 Pro and Pro Max, these may also point to a bad charge port flex due to the second connector on these batteries. |
- | * Other sensors are less well documented, and may require some context since Apple does publicize locations or names of sensors. iPads [post|730010|appear to have some vital sensors on the display|new_window=true]. [post|728588|Board level sensors also exist|new_window=true], but suffer from the same guesswork at nomenclature. |
+ | {table |
+ | |width=100% |
+ | |format=30%cm:cm:cm:cm |
+ | |! Missing Sensor |
+ | |! Location |
+ | |! Likely Issue |
+ | |-- |
+ | | PRS0 - Barometer[br] |
+ | | <<rowspan="2">> On the Charge Port Assembly[br] |
+ | | <<rowspan="2">> Charge Port Assembly or its connector on the Logic Board |
+ | |-- |
+ | | Mic1 - Bottom Microphone |
+ | |-- |
+ | | Mic2 - Rear Microphone[br] |
+ | | Power Button Cable, Camera Flash Cable |
+ | | Power Button Cable, Camera Flash Cable or its respective connector on the Logic Board |
+ | |-- |
+ | | TG0V |
+ | | <<rowspan="2">> Battery sensors, most likely for temperature and voltage |
+ | | <<rowspan="2">> Battery or its connector on the Logic Board, Charge Port Assembly on 11 Pro and Pro Max, charging circuitry on the board level. |
+ | |-- |
+ | | TG0B |
+ | } |
+ | |
+ | * Other sensors are less well documented, and may require some context since Apple does not publicize locations or names of sensors. iPads [post|730010|appear to have some vital sensors on the display|new_window=true]. [post|728588|Board level sensors also exist|new_window=true], but suffer from the same guesswork at nomenclature. |
=== Watchdog Timeout No Check In === | |
- | The Watchdog Timeout process |
+ | The Watchdog Timeout process checks for overall functionality of the system. If the amount of time between check ins exceeds the maximum (typically 180 seconds), the device reboots to attempt to correct this. |
* Rather than a missing sensor as previously discussed, you may also get a check in failure from a software component. ***Springboard***, ***logd***, ***wifid*** or ***thermalmonitord*** (with no reference to a missing sensor) are common. Although these processes may correlate to a hardware component, this is typically a software issue. | |
=== AOP Panics === | |
- | AOP panics are a whole subset of panic types. |
+ | AOP panics are a whole subset of panic types. AOP is the Always On Processor, a segment of the CPU that runs functions that are always on. Always On functions can run even when the device is off. Recent updates to the Find My network allowing the device to continue transmitting its location in an off state, [link|https://naehrdine.blogspot.com/2021/09/always-on-processor-magic-how-find-my.html|likely make use of this tech]. |
- | === AOP NMI POWER === |
+ | ==== AOP NMI POWER ==== |
An NMI is a "Non-Maskable Interrupt." In plain terms it's information which cannot be ignored and can interrupt the transmission of other signals. It is usually intended to be used for some sort of error, or system resets. | |
* This panic is often affiliated with the power button cable, or the front facing camera assembly. | |
- | === AOP Panic - K2 - Bosch control channel write failure === |
+ | ==== AOP Panic - K2 - Bosch control channel write failure ==== |
This panic typically occurs during audio related functions, like turning up the volume to maximum. | |
- | *Because the charge port flex assembly carries signals from the speaker to the board, damage to this assembly is the most common cause for this panic. |
- | |
+ | * Because the [parts|Phone|charge port flex assembly|itemtype=cables] carries signals from the speaker to the board, damage to this assembly is the most common cause for this panic. |
* Check for liquid damage to be certain and replace with a high quality, or OEM replacement if possible. | |
* This specific panic refers to an electrical line between the Power Management chip and the CPU. It could in fact mean your CPU is getting too hot. It could also mean, a board level issue with this line. | |
* Regardless of the specifics, this is almost certainly a logic board issue, not a parts problem. | |
+ | * The CPU is most likely getting hot due to some other board component. Check any areas that may have had work done. WiFi and audio related components are often the root cause. |
=== SEP ROM Boot Panic === | |
The SMC, or System Management controller will be familiar to those who have ever done any sort of troubleshooting on a MacBook. iPhones also include an SMC, but rather than being its own chip, it is part of the CPU. These panics often make mention of the error BSC FAILURE. | |
- | * Assertion Failed type panics have begun cropping up in iPhone 13. Similar to a Watchdog Timeout, they reboot the device at the three minute mark |
- | * The log will generally mention an affected sensor array followed by a code. |
- | ** 0x800 is on the charge port assembly. |
- | ** 0x1000 is part of the front facing sensor cable. |
- | ** 0x4000 is part of the battery. |
+ | * Assertion Failed type panics have begun cropping up in iPhone 13 and later models. Similar to a Watchdog Timeout, they reboot the device at the three minute mark if sensor data is not received. |
+ | * The log will generally mention an affected sensor array followed by a code. Refer to the dedicated [[iPhone SMC Panic Assertion Failed|Panic Assertion Failed wiki]] to find which code correlates to your panic. |
=== Undefined Kernel Instruction === | |
* If updates do not resolve, you may need to reinstall or restore the operating system altogether. | |
* If the issue continues to occur beyond this, you’re most likely looking at an issue with system involved in RAM or the NAND storage. This is where instructions tend to be located and when those components, or their board related systems are damaged, so can the information they’re housing or transmitting. | |
+ | |
+ | == Additional Resources == |
+ | |
+ | * [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|Troubleshooting Thermal Sensor Problems] |
+ | * [link|https://repair.wiki/w/How_To_Fix_an_iPhone_14_Pro_That_Randomly_Restarts|How To Fix an iPhone 14 Pro That Randomly Restarts|new_window=true] |
+ | * [link|https://www.youtube.com/watch?v=V_GEGB0lerU|Video: What Is Causing Your iPhone To Randomly Restart?] |
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