How to turn on a cellphone WITHOUT POWER BUTTON
There are several ways to turn on a cell phone without the power button . And also multiple solutions to be able to turn on and off the screen without this button, and in general live without it.
An Android cell phone can be turned on by the computer, with a specific combination of buttons or even by command line. Once turned on, you can set the volume button as a replacement to the power button, and use apps to control the on and off screen.
How to turn on a cell phone without the power button
Press the INTERNAL power button
If the button itself is not there or has been dropped, you can probably turn on the cell phone by simply inserting a toothpick into the hole in the hole (VERY CAREFULLY). It is inside where the real button is located. If for some reason you do not have access, you can also try to disassemble the cell phone. On the website ifixit.com have excellent step-by-step disassembly guides.
Turn on with the PC
Connect the cell phone to the computer with the USB cable. Some devices can light up in this way.
If it does not turn on by itself, while you connect it to the PC, keep the volume down button pressed until you see a boot menu that allows you to turn it on. In other models it can work by keeping the volume down and start button. In the case of modern Samsung Galaxy phones, use the volume up button and the Bixby button, as he tells us on this page .
Switch on from the recovery or fastboot
Try entering the recovery mode or fastboot (or download mode on Samsung devices). These are special mobile boot modes, from which you can select the option to restart the phone.
To enter any of these modes you need to press a specific button combination (including the power button). However, in some cell phones it is possible to access without using the power button. You can find out on Google how to enter these modes on your cell phone. A page that also offers this information is hardreset.info .
Restart by command line
An Android phone can also be restarted without the power button, by sending a text command from the PC. However, it is usually required that the mobile is switched on or in the fastboot mode indicated above. In the first case the command is used
adb reboot, and in the second case
fastboot reboot. This is done from the ADB and Fastboot program .
How to live without the power button
Once you have managed to turn on the phone, check if you have a “Scheduled Power On” option and activate it. This option will turn on the phone automatically at a certain time, in case it goes out unintentionally. You only have to make sure that the cell phone is charged when that time arrives.
A more effective solution is to remap the volume button to function as a power button. Basically you have to modify an Android system file where this operation is established. The disadvantage of this method is that you must have root permissions on the cell phone in order to do so. You can read exactly how it is done in this XDA forum .
For day to day, that is, to turn on and off the screen without a button , you can use an app. There are several to control this automatically, every time you take or stop using the cell phone. One of the best and most complete is Gravity Screen . A simpler alternative is Screebl . You can also try other apps that handle the shutdown and screen lock through a shortcut.