Galaxy S8 won’t power back on after charging overnight [troubleshooting guide]

Some people like to charge their Samsung devices overnight. While this is completely fine, there are some cases that the device may fail to wake up and even becomes dead. In theory, Samsung devices like the #GalaxyS8 is supposed to shut charging off once the battery has reached 100% but in some cases, this doesn’t always happen. If you have an S8 that fails to power back on after leaving it charged overnight, then this troubleshooting article might be for you.

Verify if S8 not turning on or display issue

There are two possible scenarios that can happen in this case: either your S8 is totally dead, or it’s a display problem. For this reason, the first thing that you want to do is to determine which of these scenarios is true.

Some users may make a mistake of saying that their device does not turn on when in fact it’s the display that has remained black only. This can happen after the device has been dropped, physically impacted or damaged, or if there’s a software bug that prevents it from running.

To know which is which, you must take note of some things. It’s really not that complicated. The best way to know if it’s a display problem is by checking for indications on your S8 itself. If your S8 still makes the following:

  • device still making sound or vibrate notifications,
  • device LED notifications are on,
  • device still rings when you call it,

then it’s most probably a display problem.

On the other hand, if your S8 has become totally unresponsive or dead (does not do any of the items above), there’s a separate set of troubleshooting that you can do.

We warn you though, almost all cases that fall within these two scenarios usually end up with repair or replacement so try not to raise your hope up too much.

Troubleshoot your S8 that won’t turn on (No Power)

After months of using it, we can say that the S8 is as reliable as any other Galaxy devices (bar the Note 7) that came before it. This is a fact and can be confirmed by millions of other Galaxy users around the world. The thing is, the device is not totally immune to problems, especially causes that can lead to No Power issue. If your S8 has become unresponsive and won’t turn on at all, that’s probably due to bad hardware. However, there had been cases wherein software-related bugs causes a Galaxy device to power back on. If this is the problem you’re having, try our suggestions below:

Solution #1: Force reboot your S8

The basic stuff are the ones forgotten most of the time and when it comes to fixing an issue like this, a simple reboot may be skipped altogether. While it may appear ordinary, many Android minor bugs are fixed by restarting or force rebooting a device. If you’ve already tried to restart your S8 without success, be sure to try a soft reset to see what happens. Here’s how to do that:

  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. Note: Utilize 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.

Solution #2: Charge using another cable and adapter

One of the common reasons why a phone may fail to start is lack of battery power. Though it’s too early to say that an S8 may already have a serious battery performance issue at this time, you can’t really eliminate it totally from this case. Lithium-ion batteries degrades over time and if it comes to a critical level wherein the charge inside becomes too low, it may not be able to power the phone, resulting to the issue you’re having. In order to power on the device and hopefully fix the battery issue as well, you have to charge it.

In order to eliminate the possibility of you using a defective charging cable and adapter, try to charge your S8 using a different set, preferably another known working cable and adapter for this phone model. If you know someone with another S8, try to use his or her charger and cable and see if that will charge your phone successfully.

Alos, if you have a favorite outlet in your house to charge your device, try using another one in a different room. Or, if you have a power bank, use that instead and see what hapens.

Solution #3: Try to boot to alternate modes

As mentioned above, there’s a chance that there may be a software-related bug causing this problem. To know that, you can try to boot your S8 to other modes that run independently of Android operating system. These modes are Recovery Mode and Download / Odin Mode. here’s how to do it:

How to boot an 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 Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).

How to boot an S8 to Download Mode

  1. Turn off the device.
  2. Press and hold down the Bixby button, Volume Down, then the Power button.
  3. Once the phone quickly boots you can let go of all the buttons.

If your S8 will boot to any of these modes but not in normal mode, that means there may be an Android problem behind it. To resolve the issue, boot the phone back to Recovery Mode and try wiping the cache partition first. If that won’t help, do the factory or master reset.

Troubleshoot your S8 with a bad display (black screen) issue

Like in No Power scenario, a black screen problem is usually due to hardware malfunction. Based on our experience with Galaxy devices, Samsung displays are very reliable and can work for years without any problems. If your S8 turns on but the screen remains black, that’s probably because it was physically damaged, wet, or suffered a software breakdown. We’re here to help you troubleshoot a software-side cause. If you damaged the screen previously, don’t waste your time trying to troubleshoot the problem at all. Instead, focus your efforts in having the phone’s screen repaired or replaced.

If the screen was working normally before it got stuck in its current black state (and the device was not dropped, wet, or damaged physically), then the following solutions might help you.

Solution #1: Boot to safe mode

This solution aims to see if a third party app is blocking the screen from working. To know that, try to load your S8 to safe mode. In this mode, third party apps will be blocked from running. If the screen works on safe mode but not on normal mode, that’s a clear sign of a bad third party app.

To boot your S8 to safe mode, follow these steps:

  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.

Solution #2: Cache partition wipe

Another great way to fix a possible screen issue due to a software bug is by clearing the cache partition. This is where the system cache is kept. Sometimes, updates and app installations may corrupt the system cache, which in turn may lead to problems. Clearing the cache partition will force your S8 to build a new system cache.

To do it, follow these steps:

  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 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 to highlight “wipe cache partition.”
  5. Press the Power key to select.
  6. Press the Volume down key to highlight “yes” and press the Power key to select.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

Solution #3: Master reset

Finally, if all else fails, you have the option to return all software settings back to their factory versions. This is a very effective solution for problems caused by bad software or app. To do it:

  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 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.