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How to fix Samsung Galaxy S7 that won’t turn on after an update & with a screen that stays black [Troubleshooting Guide]

  • Read and understand why your #Samsung Galaxy S7 (#GalaxyS7) no longer turns on after a firmware update and learn what you need to do in order to troubleshoot it in a bid to fix the problem for good.
  • Understand why the screen remains blank or black no matter what you do and know how to fix it and bring the phone back to life so you can continue to use it.

 

Power related issues are among the most common problems any smartphone owner may encounter. In fact, we’ve received a lot of complains from our readers that their Samsung Galaxy S7 won’t turn on after an update was downloaded and installed. There are possibilities that the files some of the files might be corrupted or damaged during the update process, or old cache files was not deleted during the process. It can be minor software issue or hardware.

In this post, you will learn about the power problems and determine the causes then how to prevent it from recurring in the future. Here you can learn how to perform the basic troubleshooting steps usually perform by technicians to isolate the problem.

It is imperative that you have to perform this troubleshooting procedures before bringing it to a tech. Here you will learn how to perform how to force reboot, how to run in safe mode, delete system cache files, and even perform a master reset.

Before going further, you can try and visit our Samsung Galaxy S7 troubleshooting page, there you find the most related issues that we already addressed and follow the guide. In case, if you have any more concerns you can directly contact us by filling up this form. But please provide us with more detailed information about your problem so we can help you better. Then we will get back to you as soon as possible.

Samsung Galaxy S7 won’t turn on issues

Problem: I have Samsung Galaxy S7, it started having issue several days ago, the screen keeps flashing but phone wont turn on or respond even how long I press the power button, it started after an update.

Troubleshooting: Since you’ve notice that your device is acting strange after an update, most probably it is caused by a firmware issue. It might be that some of the files are corrupted or damaged during the update process.However, you can’t set aside the possibilities of other factors that might causing the issue like your battery is drained out. To determine the issue, you can start troubleshooting the device.

Force Reboot Your Samsung Galaxy S7

This the first step that you should do if your Samsung Galaxy S7 is unresponsive. It is the same process when you pull out the battery from the device that has removable battery, we all know that Samsung Galaxy has built in battery. Here’s how:

  1. Press and hold the Volume Down and Power keys together for 7 to 10 seconds.
  2. The device will then reboot.

Boot your Device in Safe Mode

This is a diagnostic mode, it is not a fix to the issue but can help you narrow down and determine the issue. In this mode, it will allow only the pre-installed app to run and temporarily disable all third-party app.

There are cases that third-party app old files and data are not compatible with the new update, then it will confuse the device and sometimes it will not letting the device to boot up. Booting in Safe mode is the option to see if it’s caused by an app. Follow the steps below on how to run in Safe mode:

  1. Turn your Galaxy S7 off.
  2. Press and hold the Power button.
  3. Once the ‘Samsung Galaxy S7’ logo appears, release the Power key and immediately press and hold the Volume Down button.
  4. Continue holding the button until the phone finishes rebooting.
  5. Once you see the text “Safe mode” at the bottom left corner of the screen, release the Volume Down button.

Boot in Recovery mode

If booting in Safe mode didn’t work, then try to boot in Recovery mode. It will not run the Android GUI but run only the basic and necessary components, if it will let you download an update then do so. After the download, let it boot up normally, and while in this mode you should wipe the system cache partition, the steps are provided below. Anyway, here’s how to boot in Recovery mode:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.

Delete the System Cache Partition

Now, this mode is used if the device has a minor system glitch or any minor software related issue. It will clear all the old temporary system files that was not deleted during update process, it might be conflicting with the new system cache files. However, it is highly recommended to regularly clearing the cache files of your apps to improve your device’s performance.

Here are the steps how to clear the system cache files:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe cache partition.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

Visit the nearest local service center

If all mentioned steps above didn’t fix the issue, then visit the nearest local Samsung service center to let the specialist handle the issue. You pretty much have performed all the needed troubleshooting steps to isolate the issue but to no avail.

Hopefully, we were able to help fix the issue.

Samsung Galaxy S7 got a black screen that seem unresponsive

Problem: After update phone the screen is black and seem not to do anything. I tried everything and nothing happened even how many times I power off and on the device the screen still black. I really need my phone to be fix because I don’t have a backup. Is there any other way I can turn my device on? Thanks.

Solution: The same with the issue discussed above, it could be a serious issue or hardware-related issue. Since this was happened after the update, pretty much the files are corrupted or damaged during the process. It could be incompatible updates to your device, and reinstalling the update again might solve the issue.

But, you can’t set aside the possibilities of a hardware failure after an update, there are minor issues that could brick your device so, be careful of what you are installing. You can follow the provided troubleshooting steps above and perform the procedure.

You can try and connect your charger to your device, it is one way of knowing your device will respond. Make sure that it will display the default charging logo or LED indicator. Use other different chargers if there’s available like the wireless. If it won’t display, then connect it your computer and your PC recognize your device, if it did recognize let it be until there’s enough battery and power up your device using ‘Force reboot’.

If ever your device boot up in any mode, then we recommend to start making backup of your important file stored in your device and save it your SD card or any external storage device. Then, perform the master reset procedure, steps are provided below.

Here’s the steps how to master reset your device:

  1. Turn off your Samsung Galaxy S7.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  6. Once highlighted, you may press the Power key to select it.
  7. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  8. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

If none of the above procedures work, then bring it to a specialist to have it looked at. It might be experiencing a more serious issue that can’t be done by performing basic troubleshooting.

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