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What to do if your Galaxy S8 turns on but gets stuck to a black screen [troubleshooting guide]

Some #GalaxyS8 owners are reporting troubles with the displays on their devices so today’s troubleshooting guide will address one common version of this problem. We also cover other related power issues so hopefully you’ll get something out of this post.

Before we proceed, we want to remind you that if you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page. When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Problem #1: What to do if your Galaxy S8 turns on but gets stuck to a black screen

Hi. Samsung S8 Plus had it 8 months woke up to it fully charged 100 percent but had a black screen and if i pushed power it kind of half vibrates feels like its wanting to work but it just jolts nothing on the screen and the blue light came on every now and then. I tried holding power and volume it brought up the blk white n red menu that says safe mode, reset, normal restart i can’t remember all but i arrowed to safe mode. Now its black screen. No blue light. Wont do anything. I can still feel it pulsating in my hand if i press any keys. Ive tried everything. Please help i can’t buy a phone. This is my work phone. — Christleads

Solution: Hi Christleads. Your S8 does not have a No Power issue so it means there’s a chance the problem is being caused by a software bug. Unless the screen or motherboard was damaged physically, you should be able to fix this black screen issue on your level. Below are the things that you can try.

Perform a soft reset

Soft reset or soft restart is usually recommended if a device has frozen or has stopped responding. In older devices that sport removable battery packs, disconnecting the battery was the usual way to reboot the system. Not so with the later Samsung Galaxy S and Note models (which sucks by the way). Following in the footsteps of Apple, Samsung has since then switched to using non-removable battery packs in its top-of-the-line models starting with the Galaxy S6 and Note 5. That means that if any of those devices froze or stops responding, the only way to get them out of their current state is to perform a soft reset or a simulation of  a “battery pull.” This is done by doing a set of hardware button combinations. In order to soft reset your Galaxy S8 Plus, follow the steps below:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Note: Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Also, allow up to 90 seconds for the reset to complete.

Restart to Safe Mode

While it’s possible that a third party app may be behind the trouble, the primary reason why you want to boot your S8 to safe mode is to know if you have an Android operating system issue or not. Safe mode, while it does look similar to regular mode, is actually a totally separate software environment. This means that if your S8 Plus goes to Safe Mode but not to regular mode, there’s either an app issue causing the problem, or that there’s a software bug that prevents the screen from turning on.

To boot your device to safe mode:

  1. With your S9 off, press and hold the Power key past the model name screen.
  2. When “SAMSUNG” appears on the screen, release the Power key.
  3. Immediately after releasing the Power key, press and hold the Volume down key.
  4. Continue to hold the Volume down key until the device finishes restarting.
  5. Safe mode will display in the bottom left corner of the screen.
  6. Release the Volume down key when you see Safe Mode.

To know which app is causing a problem, follow these steps:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your S9 still refuses to power back on, repeat steps 1-4.

Verify if S8 boots to Recovery Mode or Odin Mode

Like safe mode, there are other two software environments that you can boot up to to check for a possible Android problem. Both of these modes are independent of Android, which means that you should be able to load them even if Android encounters an error during boot up.

Recovery Mode lets you do a number of things like wipe the cache partition, restart, or wipe/factory reset. Odin Mode, on the other hand, is another software interface that provides support should you need to replace the current firmware build, or if you want to do other highly technical stuff to the bootloader or firmware. If your S8 can boot to any of them without showing any obvious sign of a screen malfunction (vertical or horizontal colored lines, “snow,” or flickering, discoloration), that’s an indication that you have an issue with Android not booting up. In this case, the black screen may actually be a sign of an error encountered by the operating system.

To boot your S8 to Recovery Mode:

  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).

To boot your S8 to Odin or Download Mode:

  1. Turn off the device.
  2. Press and hold the Volume Down 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).

As mentioned above, each of these modes has a different function. If your S8 boots to only one of them, do more research on what you can do next. If the screen stays black though, that signifies there’s an on-going hardware malfunction. In this case, you need to contact Samsung to have your device repaired or replaced.

Problem #2: Galaxy S8 won’t turn back on after battery became empty

Hello, I woke up today and found my phone turned off, Plugged it in and obviously the battery was drained. Waited till it charged 5% and turned it on. After the Samsung logo I got the “Android is optimizing 1 app out of 1” for more than 20mins. I did a small research and read that a wipe cache partition should help boot the phone back up, so i went in recovery and wiped cache partition and restarted the phone. Now, after the Samsung logo appeared, the screen goes black. I tried plugging the charger the led won’t turn on, the charging symbol doesn’t appear, the black screen remains. Tried force restarting, force powering off, an old jig from s2 times, removed SD and SIM, changed cables and chargers, plugged it on pc, plugged it on another Samsung device using the micro USB to USB adapter… all in vain, the phone is still turned off and it won’t respond to all suggestions found online. (Those suggestions state that the phone should boot up in recovery or download mode, unfortunately it’s not). Any advise and tips on what I can do to resolve this issue, keep In mind that this same device was working normaly before I went to sleep yesterday and no new apps were installed to cause this issue. Any suggestions would be helpful at this time. Thanks in advance. — Reiss Reiss Nehme

Solution: Hi Reiss. “Android is optimizing …” screen usually indicates that the device is trying to install something, usually optimization patches for the operating system. Ideally, a user should let the device finish the action to avoid corrupting the operating system. If you did interrupt the optimization process, that may be the reason why your S8 no longer boots up.

That’s one theory though. Another possible scenario is that the system encounters an error with one particular hardware component like the battery and now it can no longer recover, preventing the battery from taking a charge.

It’s also possible that the battery has died for some reason. Keep in mind that even if the battery has reached “0%” that doesn’t mean it’s totally empty. By design, there should still be enough power left in its cell to keep the circuits alive until the next charge session. If this remaining power is used up for some reason, it can kill the battery. Once that happens, there’s no amount of charging that you can do bring it back to life.

We don’t know exactly what happened here but we recommend that you refer to the suggestions we give for Christleads above. While on it, make sure to also try using another set of known working charging cable and adapter. Charge your phone for at least an hour before attempting to power it back on. If it stays dead, contact Samsung for help.

Problem #3: Galaxy S8 won’t charge after charging port was burnt

Hello there. So my Galaxy S8 isn’t charging. Yesterday I borrowed a charger from a friend. When I plugged it into my computer to charge, the charge port started smoking. I immediately unplugged it and my phone completely died an hour or so later. When I got home and used my usual charger it wouldn’t recognize that it was charging. It gave me no indication that the phone realized I was plugging it in. Any help you can give me is greatly appreciated. I have no idea what the version of my phone is so I just guessed. — Nick herrington

Solution: Hi Nick. The smoke coming from the charging port was most likely an indication that your device’s charging port was toast. Smoke in electronics is usually a result of an overheated component or a burnt unit. The charging cable you used must have shorted the charging port, damaging the charging port in the process. Unfortunately, that also means your S8 is now physically damaged. Obviously, there’s no software trick that you can do to repair a shorted or burnt charging port. You’ll eventually need to have the device repaired if you want to continue using the port in the future.

If your S8 is still up and running at this time, make sure that you create a backup of your files to a cloud service/s to keep them safe. If the problem was only isolated to the charging port, you should still be able to charge your phone using a wireless charging pad. If you want to have the issue fixed permanently though, contact Samsung for repair.

 


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