It seems that this fellow vvf69107 is experiencing difficulties with his smartphone display, and is looking for assistance in turning off the device. However, he lacks a functional display, which creates a bit of a challenge. To clarify, some members of this community believe that he has a working display, but this is not the case.
In my personal opinion, I find it quite impractical that one needs to hold down the power button for 30 seconds in order to power off the device. It seems like an unnecessarily long time that could cause frustration for users without a functioning display. Perhaps there could be an alternative solution that would make the process more efficient and user-friendly?