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My Pixel XL phone rencently always turns off by itself. Most times it turned off just after starting up, a few times it worked longer and everything looks fine. when it happend, a "phone is shuting down"(maybe not exactly these words because my phone is not in english) dialog pop up and then shut down in a few seconds.

I tried restoring it to factory image, and tried replace a new battery, and had not fix this.

I got the log using "adb logcat", here is it : full log file

Now I think its because of a hardware part, but seems not battery. I want to find out which hardware part is it from the log file, but I don't know much about the log messages, can anyone help to find some clues about what cause the auto-shutdown? Thank you very much!

John.

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    How do you know it is not the battery? Does the problem still occur when the charger is connected?
    – Robert
    Feb 24 '20 at 19:05
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    The log only shows that the system itself (uid 1000) has initiated a shutdown via ActivityManager and android.intent.action.ACTION_REQUEST_SHUTDOWN. There is no visible reason. May be you should retry using adb logcat -b all.
    – Robert
    Feb 24 '20 at 19:16
  • I had replaced the battery with new one before, and did not change anything. And yes it occurs no matter the charger connected or not. Thank you for your suggestion and I will try to get more log today.
    – John
    Feb 25 '20 at 1:50
  • I got a new log file using "adb logcat -b all", here is it : link . Some error messages about battery appears, but currently it's the new battery in use. Can you get more details? Thanks!
    – John
    Feb 25 '20 at 3:01
  • If I interpret the line battery l=63 v=3913 t=72.7 h=3 st=2 c=5 chg=u correctly the h=3 means battery health status BATTERY_HEALTH_OVERHEAT. And t=72.7 should be the temperature but don't ask me if this is Celsius or Fahrenheit. This could be an explanation for the forced shutdown.
    – Robert
    Feb 25 '20 at 8:43
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Based on the provided logcat it seems like the shutdown is initiated by the healthd that manages for example the battery status:

healthd : battery l=63 v=3913 t=72.7 h=3 st=2 c=5 chg=u

This line contains two values of interest:

  1. h=3 is the battery health value and the value 3 means BATTERY_HEALTH_OVERHEAT.
  2. t=72.7 is the battery temperature in Celsius. This value is quite high taking it as temperature in Celsius as Android does. Hence I would assume that the battery provides the temperature in Fahrenheit but the device expects a Celsius value and therefore thinks that the battery temperature is very high. The default shutdown temperature in Android is 68°C.

What I not really understand is that all healthd message contain the h=3 value even if the temperature is lower. May be this value also reflects past temperature states.

Note: Internally Android does not directly use the temperature in Celsius, instead it uses Centigrade (Celsius * 10).

At the moment I would recommend to do the following test: Pack your phone into a water proof box and place it for some minutes in he refrigerator (make sure you use the part that has more than 0°C, you just want to cool down the device not freeze it!). Then get it out of the fridge and start it, and measure the run-time until it shuts down. The time should be larger than before.

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  • Thanks for these info! I'll follow your suggestion and try more.
    – John
    Feb 25 '20 at 11:02

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