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Galaxy S7 screen changes to black when opening apps, calls keep dropping, other issues

If you’re reading this, you must be looking for a solution to your own #GalaxyS7 issue. Keep reading and perhaps there’s something that you can get out of this material.

In this post, we share to you 6 more issues that we’ve collected since last week. We hope that this post will help more Android users.

s7

For now, these are the topics that we’ve included in this post:

  1. Galaxy S7 losing network signal at random
  2. Galaxy S7 will not play media sound when using Bluetooth headset
  3. Calls keep dropping on Galaxy S7
  4. Galaxy S7 screen changes to black when opening apps or when pulling notification tab
  5. Galaxy S7 black screen issue after accidental drop
  6. Galaxy S7 freezing and screen keeps turning black

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, or you can install our free app from Google Play Store.

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: Galaxy S7 losing network signal at random

Week old Samsung S7 losing network at random. Shows “Network out of range” message when attempting to use it. Shows no bars on scale. Have to reboot to regain Network. Had this phone for a week and has happened 3 times already. Got this phone because my Note3 was doing the same thing, and has done it from the time I got it. That was a replacement phone that they gave me because the New one I got was doing this too. So that makes 2 Note3 phones, and now the S7 doing this. Frustrating. I have had heart surgery and can not depend on my phone if I had to make an emergency call. Going back to Verizon Center tomorrow again. The phone has no bars now, and can show them in the store what it does. — Boris

Solution: Hi Boris. If the same problem keeps on happening on more than 2 devices, one of these scenarios may be true:

  1. A third party app may be interfering with your phone’s network function.
  2. There’s an unknown operating system glitch causing the problem.
  3. The network signal in your area is terrible.

The first two situations are phone-specific so doing some software troubleshooting may help. We suggest that you start by booting the phone in safe mode. This is the most efficient way to see if one of your installed apps is problematic. Safe mode blocks third party apps and services from running. If the problem will be absent while your phone is in safe mode, that’s proof that our hunch is right. To boot your S7 to safe mode, follow these steps:

  • Turn your Galaxy S7 off.
  • Press and hold the Power button.
  • Once the ‘Samsung Galaxy S7’ logo appears, release the Power key and immediately press and hold the Volume Down button.
  • Continue holding the button until the phone finishes rebooting.
  • Once you see the text “Safe mode” at the bottom left corner of the screen, release the Volume Down button.
  • Observe the phone for a few days while this mode is enabled to see if there’s any difference. Keep in mind that you won’t be able to use third party apps while safe mode is active.
  • To boot back to normal mode, simply restart the phone.

If there’s no difference even if the phone is in safe mode for a while, the problem may also be caused by an operating system glitch. To see if you can fix it on your level, you must wipe the phone via factory reset. This will not only eliminate bugs but will also restore all software settings back to their known, working state. Because the factory state of an Android operating system is generally bug free, it should help you determine if the issue is on the OS level or not. Just like in safe mode, you must observe your phone for a few days so you can compare how a factory reset software fares. Also, make sure not to install anything during the observation period so as to eliminate interference from apps. To factory reset your phone, kindly follow these steps:

  • Create a backup of your important files and contacts.
  • Turn off your Samsung Galaxy S7.
  • Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  • When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  • When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  • Using the Volume Down key, navigate through the options and highlight ‘wipe data / factory reset.’
  • Once highlighted, you may press the Power key to select it.
  • Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  • Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  • The phone will now reboot longer than usual.
  • Install the latest system update (if available).
  • Observe the phone for a few days.

If the problem remains, the issue may not be on your phone but rather on the network side. If you notice the network signal fluctuating or disappearing most of the time, the problem could be due to poor network service in your area. To address this type of situation, you must talk to your carrier’s technical support team so they can troubleshoot it.

Problem #2: Galaxy S7 will not play media sound when using Bluetooth headset

Suddenly my 2 Bluetooth headsets will not play media sound, only calls. Media sound is coming out of the loud speakers The button for turning media sound on does not react. Headsets works fine on other phones. I have:

  • Paired, un-paired many times
  • Adjusted sound levels
  • Factory reset my unit and reinstalled from back up –
  • Contacted Samsung Support Denmark who used Smart Tutor to take control over my phone. They could not solve it and concluded it was a hardware problem
  • Bought a new S7 and used Smart Switch to install the settings from the old phone, still having the same problem!
  • Gave my old phone to my wife — installed it via Smart Switch with settings from her old Galaxy Alpha. Now it works perfect with media sound = not a hardware problem
  • Started new phone in safe mode — same problem
  • Has surfed all over the net for a solution – are desperate – really hope you can help !!! — Morten

Solution: Hi Morten. You’re dealing with at least two devices here — your phone and bluetooth headset. Your problem description only shows troubleshooting for your phone but not on your headset. To see if the problem lies on your phone or bluetooth headsets, do another round of factory reset on your S7 and try to pair with one of your headsets. Make sure that you don’t install anything right after you factory reset the S7. simply do the reset then pair the bluetooth headset right away. If you can get the headset to work when the phone’s software is on factory state, that’s a sign that an app or phone setting may be causing the trouble. On the other hand, if the headset fails to work while the phone is running a clean OS version, you can assume that the problem is on the headset.

Problem #3: Calls keep dropping on Galaxy S7

Hello. I’m having an issue when being in calls with my Samsung Galaxy S7. When in a call, it doesn’t matter if I’m calling or being called, the call suddenly breaks up. And this happens at almost every call. The signal in my apartment isn’t the best, but it’s usually at least 2/4 lines (approx. between -106 dBm 36 asu and -109 dBm 31 asu). My carrier is Telekom Germany. I can’t do the soft reset as the battery is not removable for the Galaxy S7. You have a similar thread, but my exact problem is not described there: http://thedroidguy.com/2016/06/fix-samsung-galaxy-s7-cant-make-receive-phone-calls-plus-call-related-issues-1060383. Maybe the one vaguely described issue in the thread just above, where the user mentioned he changed the SIM card relates to my problem? I’ll try to change the SIM card and see if it persists. But are there similar problems with the S7? Or is my signal not enough? Or is the (not so smooth) switching between cell tower / phone mast happening within the small space of my flat as I sometimes walk around (the issue persists even if I’m sitting still).

One remark is that while I’m having a WhatsApp call AND am connected to my WiFi network, the call still gets interrupted and the app tries to reconnect, randomly with or without success whereas my laptop doesn’t seem to lose the WiFi signal. I would really appreciate your opinion on this and maybe others can also benefit from an answer to this issue. Many thanks in advance and best regards. — Fernando

Solution: Hi Fernando. In general, the closer the signal strength is to zero, the stronger the signal should be. Signal strength that goes beyond -98dBm can be problematic and can significantly raise the possibility of calls being dropped. We recommend that you work with your carrier on how to improve the signal reception in your place first so you’ll know if the problem lies on the phone. If you can improve the signal strength in your apartment to -76 to -90 dBm, then we think your calls should work as normal.

Alternatively, you can try to observe how calls work when you are in an area with good signal reception (where it shows -76 to -90 dBm at least). If your calls work normally, that’s proof that signal reception is the cause of your problem. Otherwise, there may be an unknown software or hardware issue on your phone.

To minimize network-related problems in an Android phone, make sure that you install system updates as they become available as network chip developers sometimes need to update the baseband (the operating system used by your phone’s modem) of their chips (phone modem).

Problem #4: Galaxy S7 screen changes to black when opening apps or when pulling notification tab

I have had my phone since Nov 5th, 2016. This phone was sent to me by my insurance (Asurion). It was not refurbished, it was brand new. The problems i am having are that my phone is that the lower 75% of the screen is white and it flickers… although it is completely responsive. The screen changes to black when i open apps like messages or settings and even when i pull down the notification tab. Please help! i have been restarting it, letting it sit for a while and nothing seems to work. i have NOT dropped the phone into water, but i unfortunately cracked the screen on Nov 13th. When the screen cracked, everything continued to work smoothly but today, the screen suddenly became white and glitchy when i was simply opening Google search. desperately looking for a solution! thank you. — Zalma

Solution: Hi Zalma. As we’ve been repeating time and again, water damage and accidental drops can both short-term and long-term effects. Some devices can continue operating normally while others may show indications of problems immediately or later. One of the signs of damaged screen is flickering and loss of touchscreen functionality in all or portions of the screen. If you haven’t done any software changes before the screen started to flicker, then bad hardware must be to blame.

If you want to check if there’s something that you can do, do a factory reset. If that won’t fix the screen flickering issue, bring the phone to a Samsung shop so the screen or the unit can be repaired or replaced.

More advanced Android users may risk fixing the screen themselves. If you are the more adventurous type, try looking for online guides on how to replace the screen yourself. We will warn you though that hardware repair is risky and can permanently damage other components if not done correctly. You also need to have some basic knowledge on electronics as well as the necessary tools to do the job. If you can accept the risks involved, try to look for guides via Google.

Problem #5: Galaxy S7 black screen issue after accidental drop

Hi, my phone accidentally flew out my hand whilst i was returning to my desk and it slid across my desk and hit my keyboard. I was worried as i havent dropped my phone before (got it in April) and i was relieved when the screen hadn’t smashed or anything but i went to turn the screen on and it won’t turn on. At the bottom of the screen i get a quick white flash (taking up the whole width from the bottom of the screen up almost a centimetre) when i press the home key or power button and then back to a plain black screen. I’ve done the reset where you hold the power button and volume key down for 7 seconds and it vibrated as it does but still this problem persists. I know my phone is on as the blue LED notification light is flashing. I’ve even called my phone and it vibrates. I swiped on the blank screen as i called my phone with a landline as if i was answering my phone and my phone answered! I’m assuming things are working on the phone but the screen is blank. What can i do? Please help. Thanks. — Kyle

Solution: Hi Kyle. The best thing that you can do right now is to send the phone to Samsung, your carrier, or the retailer so they can replace the screen. The accidental drop must have damaged the LCD in the least, thus all you’re getting is a black screen. Before you go though, you can also try to boot the phone to alternate modes, if only to check doing so will make any difference. If the black screen issue persists as you try different hardware button combinations, then you can proceed with repair. Below are the steps on how to boot to other modes:

Boot in Recovery mode:

  • Charge the phone for at least 30 minutes.
  • Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  • When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  • When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  • Using the Volume Down key, navigate through the options and highlight ‘wipe cache partition.’
  • You can either wipe the cache partition or do a factory reset when in this mode.

Boot in Download Mode:

  • Charge the phone for at least 30 minutes.
  • Press and then hold the Home and Volume DOWN keys, then press and hold the Power key.
  • When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume DOWN keys.
  • Wait until the Download screen appears.
  • If you can boot the phone in download mode but not in other modes, that means that your only way out may be to flash a stock or custom firmware.
  • Use Google to look for a guide on how to do it.

Boot in safe mode:

  • Charge the phone for at least 30 minutes.
  • Press and hold the Power button.
  • Once the ‘Samsung Galaxy S7’ logo appears, release the Power key and immediately press and hold the Volume Down button.
  • Continue holding the button until the phone finishes rebooting.
  • Once you see the text “Safe mode” at the bottom left corner of the screen, release the Volume Down button.
  • The only difference of safe mode from normal mode is that the former prevents third party apps from running. If you can boot the phone in safe mode but not in normal mode, uninstall all apps until the issue (that prevents you from booting normally) is eliminated.

Problem #6: Galaxy S7 freezing and screen keeps turning black

I’ve had my S7 since March. Worked flawlessly until around 2 weeks back. The first issue I got was that the phone stopped responding. I haven’t linked that to any specific application. It happened at random. So the phone freezes and screen goes black. I used the Power button + Lower Volume button to power up the phone again and it worked. But then the no response problem happened more often. So I decided to go for a factory reset. I did this using recovery. But I continued to get the freezing issue. And the last time I got it was a few hours ago. But this time when I used the power button+ down volume button, the phone got stuck in a boot loop. I managed to bring up recovery to power down the phone. When I booted into recovery, I got the a dead android logo with a yellow exclamation mark in a triangle. I tried to power up my phone back, but it again got stuck in a boot loop. I know I can resolve this situation by doing a reset again. But I suppose this is not the solution as I will continue to get the freezing and not responding problem again. Any advice please? Thank you. — Mystie

Solution: Hi Mystie. The general rule in Android troubleshooting is simple — if all software troubleshooting have already been exhausted, then the problem must be hardware in nature. The same is true in your case. To see if bad hardware is to blame, make sure that you do all software troubleshooting.

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

If nothing changes after wiping the cache partition, you can then restart the phone in safe mode to see if a third party app is problematic. Refer to the steps above. Finally, if the problem remains even when you boot your S7 to safe mode, do a factory reset. Make sure to observe how the phone works without apps for a few days. If the problem won’t go away, find a way to have the device replaced.

 


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