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How to troubleshoot Samsung Galaxy S7 Edge screen flickering issue & other display problems

While many Samsung Galaxy S7 Edge owners were complaining about power and system related issues after the Marshmallow update, there are some that encountered screen related problems especially screen flickering issues.

Galaxy-S7-Edge-screen-issues

The problems I addressed below are just some of those that were reported by our readers. It seems like it’s a widespread problem and the fix may need to come from Samsung especially for screen-related issues that occurred immediately after the Marshmallow update.

Read on to learn more about these problems and how to troubleshoot them. If you have other concerns, try to find similar issues from our S7 Edge troubleshooting page as we’ve already addressed a lot of problems with this phone since its release you may also contact us if you need more help. Just fill up our Android issues questionnaire and we’ll include your issue on our future posts.

Q: “This morning I got a notice on my phone that an android update was available. I installed it. And now my screen is constantly flickering and jumping around.. Also if I turn up the brightness too high, the entire screen goes white/yellow and I can see nothing. Any ideas?? I have an unlocked phone running an AT&T SIM card.

A: Screen flickering issues can actually range from a minor app and firmware issue to a more complicated hardware problem. In your case, it seems like it’s all the new firmware that is to blame but you still have to rule out the possibility that your apps have something to do with it. So, the first thing you have to do is boot your S7 Edge in safe mode to temporarily disable all downloaded apps and third-party services. Then, observe your phone’s screen to see if the problem still occurs. Here’s how you boot your device in safe mode:

  1. Press and hold the Power key.
  2. As soon as you can see the ‘Samsung Galaxy S7 EDGE’ on the screen, release the Power key and immediately hold the Volume Down key.
  3. Continue holding the Volume Down button until the device finishes rebooting.
  4. You may release it when you can see ‘Safe mode’ in the bottom left corner of the screen.

Should the problem occur in safe mode, then it could be an issue with the new firmware or possibly a hardware problem. The next thing you have to do is try to delete the cache of the previous system.

System caches aren’t automatically deleted when new firmware is installed. In this case, the new system may continue using them and that’s when complications occur. The problem might be caused by incompatible or corrupt caches. Due to this, you need to delete the caches, here’s how:

  1. Turn off your Samsung Galaxy S7 Edge.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy S7 Edge 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 wiping the cache partition. Once completed, highlight ‘Reboot system now’ and press the Power key.
  9. The phone will now reboot longer than usual.

At this point, if the problem remained, it could mean that it’s a serious firmware or hardware issue. I am not sure if you still can backup your data and files because you really need to reset the phone to bring it back to its default settings while leaving the new firmware installed on your phone.

The master reset can fix a lot of problems with the firmware and the hardware so it’s necessary you do this before you visit a technician to have the phone checked. For us advanced users, we often resort to the re-flashing of the firmware but we really don’t want to suggest that to average users as they may end up messing up their devices all the more. So, if the procedure below fails, send the phone in for checkup and/or repair:

  1. Backup your data.
  2. Remove your Google account.
  3. Disengage screen lock.
  4. Turn off your Samsung Galaxy S7 Edge.
  5. Press and then hold the Home and Volume UP keys, then press and hold the Power key.

NOTE: It doesn’t matter how long you press and hold the Home and Volume Up keys, it won’t affect the phone but by the time you press and hold the Power key, that’s when the phone starts to respond.

  1. When the Samsung Galaxy S7 Edge shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  2. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.

NOTE: The “Installing system update” message may show on the screen for several seconds before displaying the Android system recovery menu. This is just the first phase of the entire process.

  1. Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  2. Once highlighted, you may press the Power key to select it.
  3. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  4. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  5. The phone will now reboot longer than usual.

Q: “I am currently in Germany, I got an update notification on my phone for the operating system. I installed and now the entire screen flickers, has green and pink stripes and the battery gets very hot when i try to do anything. I have rebooted and no change, start in safe mode – no change. I have done a factory reset – no change. I am at a loss and can’t find any help online any where. I have the SMG935FD – dual sim international version. I have not installed any new applications in the last month and all was fine until this morning.” — Peter

A: Hey Pete! Your problem is the same as the one I addressed above but in your case, you’ve already done the basic troubleshooting procedures to rule out possibilities. I think this issue can be fixed by re-installing the firmware but you have to do it manually using a computer and the flashing tool Odin.

Apparently, it’s a firmware issue and unless Samsung addresses it (by rolling out another update that doesn’t have this kind of issue), the only viable option is to downgrade your phone to Lollipop. It’s a very inconvenient thing to do not to mention risky but if it’s the only option left to make your phone work again, I think it’s worth all the troubles. The problem is not everyone knows how to manually flash a firmware to a phone. So, you really need a technician’s help for this.

I feel sorry that many S6 Edge+ owners are experiencing this issue. We sincerely hope Samsung will fix it as soon as possible.

Q: “The screen will turn on but it won’t be bright and the screen flickers plus if I click on a app the phone will turn black. When I push the power button a white stripe will appear on the bottom of the screen and when I put a bright light on the top sensors the display will turn on but then the screen eventually  turn black.

A: If this problem occurred after the Marshmallow update, then it’s no different from the first two issues I addressed above. You have to do the standard troubleshooting procedure before sending the phone in for checkup and/or repair.

However, if it occurred even with the update, then there’s a chance it’s a hardware problem especially if the phone got in contact with liquid or got dropped recently. You need a technician to check it for you.

Q: “I was on my phone whilst on charge when it suddenly (hard to describe) went black screen then started sketching out only light on the top of the screen then after a while light shows down the screen but it’s all misty. Practically like if I had dropped it and ruined the entire pixel hardware, I’ve only had it a month, no scratches on the screen and I’ve never dropped it, I’m hoping the heat hasn’t completely fried the display.

A: I was actually thinking the same thing. The phone may have overheated and there’s a possibility something got fried inside. But I suggest you follow the standard troubleshooting procedures above and if the problem remained after that, you really have to let a technician take a look at it.

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