Galaxy S8 won’t turn on if not connected to charger, speaker turning on and off after getting wet

Millions of #GalaxyS8 devices are now officially over a year old so it can be expected that some owners may now be experiencing power-related issues. In this troubleshooting episode, we bring you solutions to two common issues on Android devices — what to do with water damaged phone, and won’t turn on properly — so hopefully you’ll find this post helpful.

Problem #1: Galaxy S8 speaker turning on and off after getting wet, screen not working properly

Hello. I got my Samsung Galaxy S8 wet couple hours ago. I drop a cup of coffee over the display. Then I dry it with a towel but I didn’t power it off immediately, but try to make a call. There was not a problem with the call. Then I decide to switch it off for a half an hour. After I turn it on again, the phone started making funny noises like an app notifications, but strange for me. I tried to make a call again, but phone started to turn on and off ‘speaker’, the display started turning on different edges. Then I switched it off, again, let it dry and pull over the SIM card. Now it is switch off for an hour. What I need to do now and how many hours it need to be turned off? Should I be worried about something?  I just read that this phone is not waterproof but it has water resistance. I also read to take it in a cup of rice, because rice takes the water. I will be very grateful if you can give me an advice and tell me what to do and what is going on with my Galaxy. Thank you in advacce! Best regards. — Vladimir

Solution: Hi Vladimir. You’re right, your S8 is not fully immune to water but it does have very good water resistance to occasional splashes. In fact, Samsung does not market it being able to to resist water damage if submerged for up to 1.5 meters for 30 mins. While that may hold true in certain controlled conditions, you should continue to do due diligence when it comes to liquid. Water resistance is made possible by using nano technology and clever body design but it can easily be compromised if there’s a small break in the device, like what happens when you drop it. The general rule when it comes to electronics is to avoid exposing them to moisture or liquid. This is true for both water resistant and non-water resistance devices.

Now, in your case, we really can’t say for sure if coffee or any liquid managed to penetrate your phone’s defenses but if it was working normally immediately before you poured coffee on it, you can assume it has liquid damage at this time. The erratic behavior of the screen may be caused by liquid seeping into the screen assembly and damaging the circuit. Unfortunately, once water damage has taken place, its effect can no longer be reversed. Once a hardware has been damaged by water or liquid, there’s usually no amount of drying that you can do to undo it.

Drying an electronic device like your phone with rice is actually overrated. It’s main goal is to absorb water moisture from the device but not to fix a damaged component. Drying an already damaged part will not fix it at all. In your case, we suggest that you let a trained professional open the phone and see how extensive the damage is to the motherboard and screen. If you’re lucky and the damage is minimal, a minor repair may bring the phone back to its normal working order.

Problem #2: Galaxy S8 won’t turn on if not connected to charger

Hi, my phone was fine last night, but once i press the tab button, it went blackouted. I tried to power on my phone by pressing the on button for several seconds and it looks fine. But once its in the “Samsung” stage, which is the logo once you powered in your phone, it when blackouted again. The next morning, i when to charge my phone and powered on my phone, it went perfectly fine, but once i unplug my charger, it went backouted again within seconds. Can you help me find out whats going on with my device? Thank you. — Wongchowseong

Solution: Hi Wongchowseong. Either you have a battery problem, or your phone has a majory hardware issue. To see if it’s a battery problem, you want to do three things:

  • Recalibrate the operating system (OS) and battery
  • Observe in safe mode
  • Factory reset

If the problem stays after doing them, you can assume that the problem is hardware malfunction.

Recalibrate the operating system (OS) and battery

Sometimes, Android may lose track of correct battery levels causing random shut downs or restarts. This can be caused by a number of things but in order to address it, you can do a simple trick. Here’s how it’s done:

    1. Drain the battery completely. This means using your device until it powers down by its own and the battery level reads 0%.
    2. Charge the phone until it reaches 100%. Be sure to use original charging equipment for your device and let it charge up completely. Do not unplug your device for at least two more hours and also don’t use it while charging. 
    3. After the elapsed time, unplug your device. 
    4. Perform a warm restart by holding the Power and Bixby buttons simultaneously until the startup logo appears.
    5. Use your phone until it completely runs out of power again.
    6. Repeat steps 1-5.



Observe in safe mode

Sometimes, a bad or poorly coded third party app may interfere with other apps or Android. While it’s rare to see a third party app directly causing a battery to malfunction, there are some cases when a device can no longer boot properly because of it. To check if you have a third party app issue, try booting the device to safe mode.

In safe mode, only preinstalled apps will be permitted to run. So, if your phone boots up normally and won’t restart on its, that means there’s a bad app causing the system to become unstable.

To boot your S8 to safe mode:

  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.
  8. Open Facebook app and see how it works. To know if there’s a difference, use Facebook app for a few hours.

To identify which of your apps is causing the trouble, you should boot the phone back to safe mode and 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 S8 is still problematic, repeat steps 1-4.

Factory reset

You will want to factory reset your S8 if all our suggestions above won’t help. By doing this, you are effectively returning all software settings to their defaults as well as eliminating possible software bugs possibly causing your phone to crash or fail to boot up. Here’s how 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 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.

Don’t forget to back your files up before doing a factory reset to avoid losing data.

Get help from Samsung

If nothing changes after a factory reset, you can assume that the problem is hardware-related. Send your phone to Samsung so a professional can do some diagnostics and repair the device is necessary.


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Harvey Hisona

Harvey is keen with mobile technology and loves writing about all things mobile. He is passionate in helping technology-challenged people by finding resolution to their issues. Contact me at Email

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