A very common issue with the iPhone X series and 11, is a tiny bit of water landing on the proximity sensor. This usually causes the phone to reboot all the time.
The proximity sensor is on the flex cable that has the earspeaker attached to it.
Simply disconect it, and leave it disconected for now. Boot the phone and see if the phone still reboots after 3 min. If it does not, then that is probably the issue. Replace the proximity flex cable.
Note: the proxi is part of the faceid circuit and you will loose that functionality, if you replace that part. You can transfer or repair the original proxi if you can micro solder.
If disconecting the proxi did not fix it, disconect everything besides the screen, battery, and power button. Boot the phone and test for bootloop.
If the bootloop is gone, start recconecting parts one by one while testing for bootloop. You will find the part at fault.
If it still bootloops disconect the power button and connect the port instead, and prompt to boot via the port and test again.
If the problem is still there, you have narrowed it down to the motherboard.
I hope this helps
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The dock flex cable needs to be replaced. The cable must be original!
da Максим М
I have an A1901 iPhone X 256 which had a swollen battery. It was working fine, then I took it to the Apple Store and they screwed it up. They replaced the battery but now the phone only stays on for a few minutes and goes to the white apple logo. It does this repeatedly. I was able to incrementally recover images using a fresh Photos library then importing photos from the connected device 3 minutes at a time. 4000+ images! 24GB! I have not been able to find another suitable conduit utility to retrieve other information. They spend too much time analyzing then the phone times out and restarts. We have no back up otherwise and remembering or resetting every password on the new phone setup is aggravating. Again, other than the battery, there was nothing wrong before Apple broke the device. While Apple is willing to swap phones, we don't want to let the data go until we try everything.
da patrick nolan
how did this work out for you? same position... june 2022, iphone xs max. was it the flex cable? did you just *gasp* restore to factory?
da Albert Einstein
I have this kind of panicfull error
"panicString" : "panic (cpu 1 caller Oxfffffff01cd8b878): userspace watchdog timeout:
no successful checkins from thermalmonitord since load nservice returned not alive
with context : is_alive_func returned unhealthy : current 5fffffffff, mask 3fffffffff,
expected 3fffffffff. SD: 1 BC: 1 RC: 0 BS: 1, Missing sensor(s): Prs0 Inservice:
backboardd, total successful checkins since load (180 seconds ago):” i tried replacing charging flex with other original flex also i tried replacing original flash flex then too i gets retarted at 180 secs
da omkar vankudre
Same is the case with my iphone X,
How you fixed it, please guide me.
da Its City