Pinephone won't boot.

[fxc]

Pinephone screen stopped working. The system starts but the screen is black. When starting the jumpdrive, the screen is bright gray, but after an hour of charging, nothing has changed. The battery voltage is 3.76 volts. I have tried different operating systems and chargers. The last time it worked, I turned it off by holding the power button and put it on the table.

Which Jumpdrive image did you flash? Jumpdrive is not supposed to show a gray screen, instead it should show this screen: https://wiki.pine64.org/images/1/1a/Jumpdrive.jpg

The rest of the symptoms describe a drained battery, maybe beyond the point of saving. Mind that in this state, charging it for only one hour in Jumpdrive is not sufficient, at this state it will charge very slowly and it is required to charge it multiple hours until the drained battery takes some charge again.

I used both jumpdrive images. pine64-pinephone-charging.img.xz and pine64-pinephone.img.xz.

/home/spha/Загрузки/pine64-pinephone.img.xz

Please don't use the charging image, it disables the screen and it would match what you described (no screen output, possibly only backlight). I would suggest that you redownload https://github.com/dreemurrs-embedded/Ju...one.img.xz and check if you get a screen output with that.

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The rest of the symptoms describe a drained battery

Do they really? The user reports a battery voltage of 3.76V. According to the battery data sheet, the "nominal voltage" is 3.8V, the "end of discharge voltage" is 3.0±0.05V. Considering those numbers, 3.76V does not sound like a badly discharged battery to me.

4.20 V when it is full. After an hour of charging it should be more than that, 3.76 V is in the bottom 0-10 %. I don't trust these measurements and am not considering them in my reply.

I tried to use both images. When using pine64-pinephone.img.xz, the screen is bright gray, but the Jumpdrive itself was working. After some time of charging the battery, the battery voltage is 3.80 volts.

If the USB functionality of Jumpdrive works it is not a drained battery. Sounds like the phone is functional but the display unit stopped working. 

It's a bit tricky to diagnose from this point of view because it would require further tools. I can give some general hints without saying which one the right or best way is:

• You can also open the phone and try to readjust the screen connector and see if that makes a difference (the one left to the microSD connector, see https://www.pine64.org/wp-content/upload...Phone1.png)
  
• With an USB UART adapter connected to the headphone jack (and the switch inside the PinePhone toggled to UART output) it would be possible to check if the OS is functional
  
• Screen can be replaced, however at this point it is unclear if there is an issue on the screen or the mainboard or other kind of issues
  
• Additionally, the battery behavior is currently also unclear, 3.8V is also not much change either