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Galaxy S5 screen keeps flickering, won’t sometimes respond, and mobile data not working

Welcome to another #GalaxyS5 post for this week. In this material, we bring you 5 more issues reported by some of our readers all over the world. We hope that the solutions in this post can help not just those mentioned here but others who may also be experiencing similar troubles.

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Below are the specific topics we tackle in this post:

  1. Galaxy S5 mobile data not working in the UK | Roaming on Galaxy S5 not working
  2. Galaxy S5 can’t read an SD card
  3. Galaxy S5 keeps losing network signal
  4. Galaxy S5 screen keeps flickering and won’t sometimes respond
  5. Galaxy S5 cellular network signal keeps dropping

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 S5 mobile data not working in the UK | Roaming on Galaxy S5 not working

Hi. I bought a Samsung Galaxy S5 Neo from Romania locked on carrier Orange. I unlocked it at a GSM store, and went to UK. I bought an O2 pay to go SIM card. After the settings came in, i installed them, and after like 5 minutes I could call and text, but no SIM internet was available. it worked for like 2 minutes, but then the 4G symbol disappeared. I went to the O2 shop. they tried to put the APN settings again, it didn’t worked. they tried on the computer different things they said that was the most they can do. they tried my SIM in another phone to see if the SIM was faulty but it was Ok. so my problem has to be my phone. I got the 6.0.1 version, baseband version G903FXXU1BPD4, KERNEL VERSION 3.10.61-8140803, I came back to Romania and tried the roaming internet, the 4G symbol appeared but I don’t have roaming internet sadly, so please help me for when I go back and that is soon. and also in my country the SIM internet is working of course. Thank you !!! — Andrei

Solution: Hi Andrei. There are a number of reasons why mobile data won’t work so you must check the following:

  • Network type. While mobile data may work on 2G, the speed is terribly slow and won’t even manage to open a decent website. You must either have a 3G or 4G coverage in the area in order for you to use mobile data comfortably. If your phone does not detect 3G or 4G in the  UK, it may suggest that:
    • 3G or 4G in your area (in the UK) is terrible or non-existent,
    • your phone is not permitted to use O2’s mobile data service
    • your phone’s hardware does not support O2’s frequency bands
  • APN settings. If:
    • O2 store representatives have set the APN settings correctly,
    • the phone is permitted to use O2’s mobile data service, and
    • your phone’s hardware is compatible with O2’s frequency bands,

then there’s no reason why mobile data won’t work. Assuming your phone’s mobile data function is working, one of these necessary items above must be missing, preventing your phone from connecting to mobile data.

To check if there’s a provisioning issue, contact O2’s customer support for help.

For your roaming issue in Romania, make sure that you contact your wireless service (the company of the SIM card you’re using). Roaming problems can involve possible reasons that may be specific to a wireless carrier so they are the only party that can effectively help you.

Some of the questions you should consider when dealing with roaming issues are the following:

  • Did you set roaming up before leaving for Romania? This involves help from your wireless carrier. You need to activate roaming service with them first in order for you to use your phone outside your country or network.
  • Is airplane mode on?
  • Is roaming permitted in your specific place in Romania? This question can be answered by your carrier. In order for roaming service to work, your carrier must have an agreement with other carriers to allow their customers to continue using their mobile services. You must talk to your original carrier about this.
  • Is your S5 set to automatically select a network? If you’ve already determined that roaming has been activated for your phone, try to manually search for a network by following the steps above:
    • From the home screen, tap and drag the Notifications bar downwards.
    • Tap the Settings icon.
    • Scroll to and tap More networks.
    • Tap Mobile networks.
    • Tap Network operators.
    • If prompted tap OK.
    • Tap the required network.
  • Are you getting 3G or 4G coverage? As mentioned above, your phone must be able to connect to either 3G or 4G network to have a good mobile data service. Of course, that can only happen if your phone’s hardware supports the frequency bands of the network. If the phone isn’t compatible, there’s no amount of troubleshooting that you can do to solve your problem.

If all these items have been covered but mobile data continues to fail, contact your carrier for additional support.

Problem #2: Galaxy S5 can’t read an SD card

Hello. I discovered your site while trying to research a new issue that popped up on my phone. Two days ago, my phone unexpectedly stopped reading or even recognizing my SD card. I’ve done all of the various normal troubleshooting that has been suggested in the various forums and sites, but nothing has fixed it. I did insert a different SD card and the phone recognized it and I was able to view pictures from that card. so it’s likely that the current SD card has just gone bad (which is a bummer as I had no backups of years of photos). But what’s really puzzling to me, is that when I go into Settings/System/Storage, I see nothing about External storage at all. Even with the SD card removed and powering up the phone and going to the Storage utility, there is nothing about an SD card or external storage. Everything I’ve read or seen tells me this is the location where I’m going to see options to mount or unmount a SD card, but all that is visible to me is the Internal Storage statistics. Am I missing something entirely? — Kevin

Solution: Hi Kevin. If we are not mistaken, you’re wondering why you’re not getting the options to mount or unmount an SD card when the SD card is not inserted in the phone. The said options are only available if your phone detects that there’s an SD card inserted in the first place. Mount or unmount options will not be available under Settings>Storage if:

  • the phone is unable to detect an SD card because of a bad SD card slot,
  • there’s no inserted SD card,
  • the inserted SD card is corrupted/unreadable

Since your phone is detecting a second SD card without problems, that’s a clear indicator that the problem only lies on the first SD card. You must reformat it if you plan on using that card again. Before you try to reformat it though, make sure that you try to see if another device can still read it so you can save your files. If there’s no other device that can detect it, forget about files — they’re good as gone.

Problem #3: Galaxy S5 keeps losing network signal

Hello. I purchased an S5 on eBay and thought all was good but then I noticed I was losing my network connection often. It happens at any moment but I will lose all bars and there will be no 3G or 4G icon, all will be empty. If I want to make a call or check my voice mail, it will state that my phone has lost connection and give me the option to activate wifi calling. I have noticed that I will lose connectivity easily when going into buildings, everyone else is talking on their phones, mine won’t have a connection. I am with Verizon and my wife’s phone will work fine (also with Verizon). When on a call it will always drop out for a few seconds and then come back in usually within the first minute of the call. I have noticed that when I lose the connection, I can switch airplane mode on, then off again, and it will usually reset the connection. It has become very problematic. Any ideas? — Jake_ruh

Solution: Hi Jake_ruh. An issue like this is most often due to bad hardware. To check, you must try all relevant software troubleshooting. Below are the things that you can try.

Wipe the cache partition. You want to make sure that your phone uses an updated system cache. Sometimes, app installations or system updates can corrupt the system cache. Wiping the cache partition will ensure that the device’s system cache is up-to-date. To do that, follow these steps:

  • Turn off your Samsung Galaxy S5 completely.
  • Press and hold the Volume Up and the Home buttons first, and then press and hold the Power key.
  • Keep the three buttons pressed and when ‘Samsung Galaxy S5’ shows, release the Power key but continue holding the other two.
  • Once the Android logo shows, release both the Volume Up and Home buttons.
  • The notice ‘Installing system update’ will show on the screen for 30 to 60 seconds before the Android system recovery screen is shown with its options.
  • Use the Volume Down key to highlight the option ‘wipe cache partition’ and press the Power key to select it.
  • When the process is complete, use the Volume Down key to highlight the option ‘Reboot system now’ and hit the Power key to restart the phone.
  • The reboot may take a little longer to complete but don’t worry and wait for the device to become active.

Observe in safe mode. If wiping the cache partition won’t improve the situation, the next step for you is to see if one of the third party apps is to blame. This is done by restarting the phone in safe mode. While this mode is active, all third party apps and services will be blocked. See to it that you observe the phone for a few days while in this mode so you’ll notice the difference. Remember, if the problem won’t occur while safe mode is enabled, that a confirmation that our hunch about a third party app causing the problem is correct. To boot your S5 in safe mode, follow these steps:

  • Turn off the phone completely.
  • Press and hold the Power key.
  • Once ‘Samsung Galaxy S5’ shows, release the Power key and immediately press and hold the Volume Down button.
  • The phone will restart but keep the Volume Down button pressed.
  • Once the phone has finished restarting, ‘Safe mode’ will be display in the lower-left corner of the screen.
  • You may now release the Volume Down button.
  • Observe the phone for a few days.

Wipe the phone via factory reset. Finally, the last thing that you can do on your end is to restore all software settings back to their known, working state. Also known as master reset, factory reset will not only eliminate existing software bugs but will also wipe the phone’s internal storage. Try to avoid installing apps right after you factory reset your S5 so you can observe how it works. Let it run for a day without third party apps so you’ll know if there’s a difference as far as its network function is concerned. The only other important thing that you want to do right after a factory reset is to install system updates (if they are available). Doing so will update both the operating system as well as the baseband version (the operating system your phone’s modem needs to work properly).

If the problem stays though, that’s proof that hardware is to blame. You must then find a way to have the phone replaced.

To factory reset your device, follow these steps:

  • Turn off your Samsung Galaxy Note 5 completely.
  • Press and hold the Volume Up and the Home buttons first, and then press and hold the Power key.
  • Keep the three buttons pressed and when ‘Samsung Galaxy Note5’ shows, release the Power key but continue holding the other two.
  • Once the Android logo shows, release both the Volume Up and Home buttons.
  • The notice ‘Installing system update’ will show on the screen for 30 to 60 seconds before the Android system recovery screen is shown with its options.
  • Use the Volume Down key to highlight the option ‘Yes — delete all user data’ and press the Power key to select it.
  • When the process is complete, use the Volume Down key to highlight the option ‘Reboot system now’ and hit the Power key to restart the phone.
  • The reboot may take a little longer to complete but don’t worry and wait for the device to become active.

Problem #4: Galaxy S5 screen keeps flickering and won’t sometimes respond

Hey there. I have a problem with my Samsung Galaxy S5. It always keeps flickering and sometimes it doesn’t respond even if the brightness was set to high. When I try to turn on my phone every morning I just keep pressing both the home button and the power button hoping that it will respond. It takes like 3 minutes to open my phone because it does not respond and it gives me a black screen with some flickering green and white colors. I tried to reset my phone, go back to a lower version (I have 6.0.1 right now). And I tried a lot of other things I had found in the internet the last months. But nothing worked Can you please help me fixing my phone? Thank you. — Khalid

Solution: Hi Khalid. Android troubleshooting is simple — if you’ve already exhausted all software troubleshooting, then bad hardware must be the cause. In majority of cases, flickering screen issue is due to a malfunctioning screen assembly. Try to boot the phone to other modes to see if the screen flickering issue will be absent. If the problem stays in all of the alternate modes, that’s proof that you have a hardware issue. You must have the phone repaired.

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 #5: Galaxy S5 cellular network signal keeps dropping

When trying to make an outbound call my signal drops from 4G to 3G, 2G then H and finally E. And although the timer starts to say I’m connected, they cannot hear me and I cannot hear them. Is it a coincidence that my 2-year contract is due soon or is it that the problem started soon after I updated my OS to 6.0.1? My wife has the same phone but hasn’t done the update and doesn’t seem to have problems. I’ve done a soft reset but still have the problem and I’m one step away from backing up my phone and doing a full factory reset but really want to know if it will cure the problem. I love the handset and would go SIM only when my contract comes to an end. — Adrian

Solution: Hi Adrian. If the issue started occurring after installing an update, then wiping the cache partition and factory reset should help you. Refer to the steps above on how to do these solutions.

Also, make sure that you only install back after a factory reset apps that are compatible with Android Marshmallow. This may sound simple but updating apps and making sure that you only install compatible apps are often overlooked by many Android users after a system update. Keep in mind that not all apps are created equal. One app may work well with Android Lollipop but not with Marshmallow. It’s your responsibility to keep your apps updated and compatible. To check if an app will work with your operating system, consult its installation page in Google Play Store. Better still, try to contact the developer to get firsthand information.

 


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