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Samsung Galaxy Note 8 turns off immediately after booting up [Troubleshooting Guide]

ByHarold Hisona

There’s no doubt the Samsung Galaxy Note 8 is one of the best smartphones out there but just like any other Android phones, it’s still prone to errors and issues. In fact, we have received quite a lot of issues with this device and recently, some of our readers reported that theirs started to turn off immediately shortly after the boot up process. It means the phone can still reach the home screen before it powers down.

This is one variation of the boot loop problem but with this, there’s a big chance that the problem is with the hardware. The thing is, we really don’t know why this problem is happening so we need to do some basic troubleshooting procedures. That’s what we’re going to do in this post so if you’re one of the owners of this phone and are currently bugged by a similar concern, continue reading as we may be able to help you with it.

Before we proceed, if you found this post while trying to find a solution to a different issue, then head to our Note 8 troubleshooting page as we already addressed some of the most common problems with this device. Odds are that there are already existing solutions to your problem so try to browse the page to find similar issues with yours and feel free to use our solutions. If you still need our help though, contact us by completing our Android issues questionnaire.

Troubleshooting Note 8 that turns off after booting up

The course of this troubleshooting guide will be to determine if this is an issue with the hardware, then we’ll check if it’s due to physical and/or liquid damage. After which, we will have to resort to other procedures to see if this is a problem with the firmware or some of the apps and if we can fix it our own without any help from a tech. With all of that being said, here’s what I think you should do about this issue…

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Try charging the phone and start it up while it’s connected to its charger

You don’t need to do this to charge your phone but rather to know if it still shuts down if it has a stable power source. The phone gets power from its battery but when it’s connected to its charger, it would also draw power from it so if the phone shuts down due to battery failure, then it shouldn’t do so when it’s connected to the charger.

Assuming your phone won’t turn off when it’s connected to its charger, the next thing you should do is continue using it while it’s plugged in and then try to check if it still shuts down on its own once you disconnect it from the charger. This is one way to know if it’s a hardware problem or not and if it does show it’s an issue with the hardware, then forget the other troubleshooting procedures and bring your phone to the service center.

However, if the phone is still shutting down by itself even if it’s connected to the charger, move on to the next step.

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Check if the Power key is stuck

The most common signs of a stuck power key is when the phone turns on and before it can reach the home screen, turns off and then on again. The cycle never ends until the battery is depleted. However, it’s still possible that the cause of this kind of problem is a damaged or stuck power key so you still need to check it.

If you just put on a new case on your phone and then this problem started, then it must be the power key that’s messed up. One way to know if the power key is damaged is when it doesn’t snap anymore when you press it. For a stuck power key, the external button may appear normal but it’s a lot softer when you press it. If the key appears to be normal, then try the check step.

Check for signs of physical or liquid damage

Had your phone been dropped on a hard surface then you should see some marks; it could be in the form of scratches, dents or cracks. If your phone still looks flawless, then move on to checking for possible liquid damage.

Your Note 8 is IP68-certified which means that it’s water-resistant but that isn’t a guarantee it won’t suffer from liquid damage anymore as it’s still not waterproof. The first thing you need to check is the USB port. Just look into it to see if there’s moisture in there. To make sure it’s dry, clean the area with a cotton swab or insert a small piece of tissue paper to absorb the moist. Then, check the Liquid Damage Indicator (LDI) to see if it’s tripped. Remove the SIM card tray and look into the SIM card slot to find the small sticker that would tell you if there’s liquid damage or not. If the sticker is white, then it’s negative however, if it turned red, pink or purple, then it’s confirmed that it’s liquid damage. In this case, you have to bring the phone to the tech to have it checked. Don’t attempt to charge or turn your phone on again to prevent further damage.

Run the phone in safe mode to see if it still turns off

Assuming you’ve already checked your phone for physical and liquid damage and never found any trace of them, then you should try this step. It’s possible that there is an app or two that’s causing the problem. To isolate it, run the phone in safe mode to temporarily disable all third-party apps. This is how you do it:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.

If the phone boots up successfully, continue using it to see if it would come to a point where it would shut off on its own. Assuming it continues to be working fine, then it’s confirmed the problem is caused by a third-party app. You need to find it and then uninstall it…

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Apps.
  3. Tap the desired application in the default list or tap 3 dots icon > Show system apps to display pre-installed apps.
  4. Tap the desired application.
  5. Tap Uninstall.
  6. Tap Uninstall again to confirm.

If the phone still shuts down at some point even in safe mode, then move on to the next step.

Start the phone in Recovery mode and wipe the cache partition

We are now at a point wherein we need to check if this is a problem with the firmware. Run your device in recovery mode and let it stay there for a minute or two or wait to see if it still shuts down even in that mode because if it does, there could be an issue with one of its components however, you still need to wipe the cache partition just to rule out the possibility that some corrupt system caches are doing this:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight ‘wipe cache partition’.
  5. Press Power button to select.
  6. Press the Volume down key until ‘yes’ is highlighted and press the Power button.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

Continue your observation after doing this procedure and if it still occurs, the next thing you should do is reset it.

Perform the Master Reset if possible

Assuming you’ve successfully started your phone up in recovery mode and wiped off the contents of the cache partition but the problem is still occurring, then you have to do this procedure. This will delete all your files and data so I know it’s difficult to make a backup of your important files but try as you won’t be able to retrieve them after the reset. After the backup, remove your Google account from your phone to disable the Factory Reset Protection and then follow these steps to do the Master reset:

account so that you won’t be locked out of your device after the reset.

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight “wipe data / factory reset.
  5. Press Power button to select.
  6. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  7. Press Power button to select and start the master reset.
  8. When the master reset is complete, “Reboot system now” is highlighted.
  9. Press the Power key to restart the device.

Bring the phone to Samsung service center

If the reset failed to fix the problem as well, then you should bring the device to the service center for the technician to do further tests on it. It might be an issue with the hardware and as far as basic troubleshooting is concerned, you’ve already done what have to do to fix this problem.

I hope that this troubleshooting guide can help you one way or another. If you still need our help after this, feel free to contact us anytime.

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