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6 Panic CPU x caller - Reboot every 3 minutes - Charging Port Flex?
I am looking for ideas to help fix a problem I’m having with an iPhone X. Bear with me while I describe the history, what I’ve done so far, and what the current symptoms are.
The customer said he had originally had the screen replaced at a mall kiosk and it worked well for a couple of months but one day it would not turn on. What I actually found was the phone was turning on but the screen had failed and was not turning on. I installed a new screen and all seemed well. I gave it back to the customer in seemingly 100% working condition. A few days later he brought it back to me and said it was rebooting every few minutes.
- I tried forcing an update - no change, still rebooted after a few minutes.
- I tried a DFU restore - no change, still rebooted after a few minutes.
- I googled the issue and found numerous reports about issues with the charge port causing the phone to restart every 3 minutes. I checked and confirmed the phone would reboot after 3 minutes consistently. So I ordered a new charge port flex.
- I first tried to temporarily disconnect the original flex in the phone and temporarily connect the new bare charge port flex. Voila, the phone stayed running beyond 3 minutes.
- I disassembled the phone, removed the original charge port flex, reinstalled the new charge port and reassembled the phone. Initially the phone seemed to be fixed. But after several hours I noticed it starting to go back to the 3 minute reboot cycle again. Grr. Maybe I damaged it during installation I thought.
- I ordered another new part and repeated step 4 and 5 but with greater care. Again, with the new part installed the phone seemed to fixed. This time I set the screen to stay on and started a stop watch. The phone stayed on for over 3 hours so I left it overnight.
- In the morning, the phone was BACK TO RESTARTING every 3 minutes!!!
- For fun I disconnected the 2nd new flex that was installed in the phone and connected one of the other charge ports that I had swapped out. With only the charge port by itself connected the phone still reboots. Conclusion - the flex is getting damaged somehow just by connecting it to the phone (my theory anyway).
- Some posts on here suggested a DFU restore fixed this issue - in my case, it does not. Tried it. No difference.
I dug into the analytics logs and using 3U Tools see that every time it reboots it logs a “Panic CPU x caller” entry.
Here is the detailed text from one of these entries. Has anyone seen this? What can I try next? I’m hesitant to install a third charge port but do have one if need be.
Thanks in advance for your help,
Larry
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{"bug_type":"210","timestamp":"2021-11-06 21:28:52.00 -0600","os_version":"iPhone OS 15.1 (19B74)","incident_id":"41C3AD2D-4165-42EE-9166-C156236A84EC"}
{
"build" : "iPhone OS 15.1 (19B74)",
"product" : "iPhone10,6",
"kernel" : "Darwin Kernel Version 21.1.0: Wed Oct 13 18:16:58 PDT 2021; root:xnu-8019.42.4~1\/RELEASE_ARM64_T8015",
"incident" : "41C3AD2D-4165-42EE-9166-C156236A84EC",
"crashReporterKey" : "d6ac110a82cef07ecd55c818d6c8d79130b244dc",
"date" : "2021-11-06 21:28:52.45 -0600",
"panicString" : "panic(cpu 1 caller 0xfffffff02941f0f4): userspace watchdog timeout: no successful checkins from thermalmonitord since load\nservice returned not alive with context : is_alive_func returned unhealthy : current 7bfffffffff, mask 67fffffffff, expected 67fffffffff. SD: 1 BC: 0 Missing sensor(s): mic1 \nservice: backboardd, total successful checkins since load (180 seconds ago): 19, last successful checkin: 0 seconds ago\nservice: SpringBoard, total successful checkins since load (168 seconds ago): 17, last successful checkin: 0 seconds ago\nservice: mediaserverd, total successful checkins since load (180 seconds ago): 19, last successful checkin: 0 seconds ago\nservice: logd, total successful checkins since load (180 seconds ago): 19, last successful checkin: 0 seconds ago\nservice: thermalmonitord, no successful checkins since load (180 seconds ago)\nservice: runningboardd, total successful checkins since load (180 seconds ago): 19, last successful checkin: 0 seconds ago\nservice: wifid, total successful checkins since load (180 seconds ago): 19, last successful checkin: 0 seconds ago\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 19B74\nKernel version: Darwin Kernel Version 21.1.0: Wed Oct 13 18:16:58 PDT 2021; root:xnu-8019.42.4~1\/RELEASE_ARM64_T8015\nKernel UUID: 13E2F321-3388-3B9E-9D68-75E2081A4A02\niBoot version: iBoot-7429.42.2\nsecure boot?: YES\nPaniclog version: 13\n
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101 
4 Comments
i have the same issue but my phone does’nt restart in 3 min my phone is restarting random time some times it restart after one hour some times it restart after 20 min
what should i do
by MIR GamingYT
@MIR GamingYT Best way to get answers is to start a new question. Check for panic log entries and add them to your post if any are present. The first page or so is usually sufficient.
iPhone Kernel Panics
by Jerry Wheeler
Dear,
I had the same isseu with my ipad 6 and it ended up in a bootloop then only recovery. not able to restore it.
I did something you could try as last resort if the device is compleet dead like mine.
I did it in the past with gpu,s and i put the logicboard in the over for 10 min at 180 degrees coverd the ports and charging port with thermal pads and it works fine now .
by tristan de graeve
I have the same problem but I notice that when my phone is running something in background it won’t restart, AO I turned on background sound in my control Centre and put the volume to zero and it always stay on as it should be but anytime I forget to turn it on my I’ll always meet my phone switched itself off
by Ajibade faizol