Samsung Galaxy S9 blacked out and won’t turn on after an update

Some of our readers and owners of the Samsung Galaxy S9 reported that their devices blacked out and won’t turn on after a firmware update. The update was reportedly a minor security patch for Android 9 with Samsung’s OneUI. It was not clear if the issue is widespread but if this kind of issue occurs on your device, it’s often a minor problem. In fact, you can consider it to be just a firmware crash. 

In this post, I will walk you through in troubleshooting your Samsung Galaxy S9 that blacked out or powered off by itself and won’t turn on after that. I will share with you the most effective solutions we’ve been using in fixing problems like this. So, if you’re one of the owners of this device, continue reading as this article may be able to help you. 

Before we move on to our troubleshooting, if you happen to find this post while looking for a solution to a different problem, then visit our Galaxy S9 Help Guides page for we have already addressed some of the most common issues with this device. We may have already published articles that could help you fix your problem. Find issues that are similar to yours and feel free to use our solutions.

What to do with Galaxy S9 that blacked out and won’t turn on

Firmware issues aren’t really that hard to fix but they can be so pesky because for those who don’t know what to do if such problems happen, they may immediately take a trip to the shop or store only to be told that the problem is not that serious or be charged with a couple of hundreds of dollars for a problem they could just fix on their own. We want to prevent that from happening so if you’re willing to do something about it, here’s what you need to do: 

First solution: Force restart your phone that won’t turn on

This must be the first thing you have to do. In fact, this could be the only thing you need to do to make your blacked out Galaxy S9 work perfectly again. If you’re familiar with the battery pull procedure we often do to phones with removable batteries, this is its counterpart only that it’s done on phones with non-removable batteries. In other words, it’s a simulated battery removal that has been proven effective in fixing problems like this. Basically, this is how you do it: 

  • Press and hold the Volume Down button and the Power key together for 15 seconds or more.

More often than not, your blacked out Galaxy S9 will boot up if you’ve done this procedure properly. If it does not, then do the same procedure a few more times. If it still won’t boot up after this, then you should try the following: 

  1. Press and hold the Volume down button first and don’t release it. 
  2. While holding down the volume button, press and hold the power key as well. 
  3. Keep both keys held down together for 15 seconds or more. 

This is basically the same as the first procedure only that this time we’re making sure that you press and hold the volume down button before the power key because doing it otherwise won’t give you the same result. 

If this is just one of the cases of a firmware crash, your phone should be able boot up by now. If not, then you should perform the next procedure. 

ALSO READ: My Samsung Galaxy S9 keeps losing signal. Here’s the fix.

Second solution: Charge  your phone and perform the forced restart

Having a drained battery is not really a problem, is it? But the thing is that there’s a possibility that the firmware would crash if you allow the phone to run out of battery. That could be the cause why your Galaxy S9 has blacked out. Don’t worry though as this problem is fixable. Here’s what you need to do: 

  1. Plug the original charger to a working wall outlet. It’s best to use a wired charger for this.
  2. Connect your phone to its charger using the original cable.
  3. Regardless whether your phone show the charging symbol or not, leave it connected to the charger for at least 10 minutes.
  4. After which, press and hold the volume down button and the power key for 15 seconds or more.

If your Galaxy S9 blacked out due to a minor firmware issue, then this should fix the problem. However, if it remains unresponsive or won’t turn on, then it’s probably a hardware issue. For this, you have to bring the phone to the store or shop so that a technician can check it up for you. 

ALSO READ: How to fix Samsung Galaxy S9 with WiFi that keeps disconnecting

On the other hand, if you were able to make your phone respond after this but continues to freeze or become unresponsive, then the best thing you can do about it is reset your phone. However, make sure to create a backup of your important files and data as they will be deleted. Also, make sure to remove your Google and Samsung accounts so that you won’t be locked out of your device. Once everything is set, follow these steps to reset your phone…

  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 Galaxy S9 logo shows, release all three keys.
  4. Your Galaxy S9 will continue to boot up into the Recovery Mode. Once you see a black screen with blue and yellow texts, proceed to the next step. 
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device. 

I hope that we’ve been able to help you fix your Galaxy S9 that blacked out and won’t turn on. We would appreciate it if you helped us spread the word so please share this post if you found it helpful. Thank you so much for reading!

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We are committed to helping our readers fix the problems with their phones as well as learn how to properly use their devices. So, if you have other issues, you may visit our Help Guides page so you can check by yourself the articles we’ve already published that contain solutions to common problems. Also, we do create videos to demonstrate how things are done on your phone. Visit our Youtube Channel and please subscribe to it. Thanks.