How to fix Samsung Galaxy S9 Plus that turned off by itself and won’t turn back on (easy fix)

It is normal to immediately think that it’s a problem with the hardware when your premium phone like the Samsung Galaxy S9 Plus turns off without apparent reason and would no longer power up no matter how many times you press the power key. Such is the case with some of our readers who contacted us seeking for assistance as they are worried they bricked their phones. We have encountered a lot of similar issues in the past and so we already have a clue what the problem is and why it’s happening.

In this post, I will walk you through in troubleshooting your Samsung Galaxy S9 Plus that became completely dead and not responding. We will try to look into possibilities and rule them out. I will also share with you the solution I’ve been using in dealing with this kind of problem. So, if you’re one of the owners of the Galaxy S9 Plus or any Android device for that matter, continue reading as this post may be able to help you one way or another.

For smartphone owners who found our site while trying to find a solution, try to see if your phone is one of the devices we support. If it is, then visit the troubleshooting page for that device, browse through it to find issues that are similar with yours and feel free to use our solutions and workarounds. However, if you still need our help after that, then fill up our Android issues questionnaire and hit submit to contact us.

How to fix Galaxy S9 Plus that turned off by itself and won’t turn on

While this problem may seem like a very serious hardware issue, most of the time it’s the firmware that has an issue when this thing happens. In other words, you can fix it on your own without even bringing your phone to the shop or store provided there are no signs of physical and liquid damage. With all that being said, here’s what I suggest you do about it:

First solution: Perform the forced restart procedure

Majority of this kind of problem I encountered in the past were due to a firmware crash wherein the phone became unresponsive because the operating system isn’t responding anymore. It happens more often than you think especially if you use really big and CPU intensive apps or games. When the phone freezes, hangs or becomes unresponsive, the best solution is to remove its battery but since your Galaxy S9 Plus has a non-removable battery, the only thing you could do is the Forced Reboot. It simulates battery disconnect and refreshes your phone’s memory. It could be the only thing you need to do about this problem. To do this, press both the volume down button and the power key at the same time and hold them down for 10 seconds or more. If your phone reboots like it normally does, then that could be the end of the problem, although there’s no guarantee that it won’t happen again in the future.

However, if the device is still not responding after doing the aforementioned procedure, then try this:

  1. Press and hold the volume down button and don’t release it.
  2. Then, press and hold the power key while holding down the volume down button.
  3. Keeps both keys held down together for 10 seconds or more.

This is basically the same as the first procedure only that we’re making sure this time that the power key is pressed and held after the volume down button because doing it otherwise won’t give you similar result. Now, after doing these procedures and your phone is still not responding or won’t turn on, try the next procedure.


Second solution: Connect the charger and do the forced reboot

It is possible that the battery of your phone got totally drained and while having a depleted battery is really not a problem, there are times when the firmware would crash because of it. It’s because, some of the services and hardware components may not be properly shutdown. As a result, it creates inconsistencies in the system that may leave your phone unresponsive.

  1. Plug the charger to a working wall outlet. It is imperative you use the wired charger.
  2. Using the original data / power cable, connect your S8 Plus to its charger.
  3. Regardless whether the phone shows the charging signs or not, allow it to be connected to the charger for at least 10 minutes.
  4. Press and hold the volume down button and don’t go of it yet.
  5. Now press and hold the power key while holding down the volume down button.
  6. Keep both keys held down together for 10 seconds or more.

If the phone responds to this, then you may consider the problem as fixed but there’s still a guarantee that the issue may occur again.

I hope that this troubleshooting guide have helped you one way or another. If you have other concerns you want to share with us, feel free to contact us anytime or leave a comment below.

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Harold has been in the tech industry since 2008 when he started out as a tech support for companies like Time Warner, Comcast and Tracfone. He’s been troubleshooting phones when the smartphone industry started booming. During his tenure as a tech support, he’s already been writing for various tech blogs and doing some freelance SEO. In 2012, he joined a small team of bloggers to write for The Droid Guy, and he has been with the company ever since. Today, he doesn’t only write tutorials and troubleshooting pieces but also shoots and edits videos for The Droid Guy channel while trading stocks on the side.

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