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Rooted Galaxy S7 keeps randomly rebooting, black screen of death issue, other S7 problems

Hello Android users! Welcome to another #GalaxyS7 post! We bring you another list of issues that we’ve collected for the past few days. Don’t forget to visit our main Galaxy S7 troubleshooting page if you don’t find a solution to your own issue.

 

As usual, here are the specific topics covered in this material:

  1. Rooted Galaxy S7 keeps randomly rebooting
  2. Galaxy S7 “SD Card: For transferring photos and media” error
  3. Galaxy S7 active won’t power back on
  4. Galaxy S7 black screen of death issue
  5. Galaxy S7 screen won’t turn on
  6. Galaxy S7 edge won’t charge

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: Rooted Galaxy S7 keeps randomly rebooting

Hello I have a Galaxy S7 Edge SM-G935F unlocked. When I bought this phone it had already been rooted and then unrooted. I have rooted the phone again and tried different ROMS which I seemed to always have the same problems with random reboots or just freezing altogether. I have tried Marshmallow and Nougat ROMS and sometimes they will work fine with no problems for a couple of weeks and start again with random reboots and freezes. I have since unrooted and returned it back to stock Nougat Firmware which again worked for a while and then stopped again. I have also done an emergency recovery using Smart Switch and still have the problem. Now even worst, as soon as it’s done with the recovery process it freezes on the Welcome screen or it will just restart randomly before I can even get to setup the phone, I have tried going to recovery to wipe cache and it reboots even when I’m in recovery. Don’t know what else to do any help or suggestions would be greatly appreciated. — JP

Solution: Hi JP. Random reboot is a symptom common to a number of Android problems, both software and hardware in nature, so your first task is to narrow down the causes. Root causes of random reboot issue include, but are not limited to, the following:

  1. Poorly coded operating system version
  2. Incompatible app/s
  3. Corrupted system cache
  4. Malware
  5. Malfunctioning battery
  6. Overheating
  7. Other unknown hardware problem

If the phone had been showing the problems you’re describing here the moment you received it, there’s high likelihood that the previous owner has messed up with the phone. Depending on the issue, you may or may not be able to fix the issue on your end.

The first possible cause in the list above (poorly coded operating system version) is one of the main reasons why we don’t recommend third party ROMs or unofficial firmware. Although there a few outstanding unofficial ROMs out there, majority of non-Google developed Android versions are buggy and unreliable. Bear in mind that developing a software like souped-up Android version can be quite an undertaking and require a lot resources. It’s not uncommon to hear unofficial ROMs to break devices once installed at times.

We know you reverted to a stock ROM already but since the problem occurs again, the most likely cause of the issue is most probably bad hardware. The thing is, there’s no direct way to know for certain which hardware component is failing. The general rule in Android troubleshooting is to do all relevant software troubleshooting (which includes in this case wiping the cache partition, booting to safe mode, factory reset, flashing of stock firmware) first; if nothing appears to work, then you can assume that hardware is to blame. Items due to hardware (in the list  5, 6, and 7) can only be tested by a trained technician so we advise that you send the phone to Samsung so they can check the battery first. If battery is okay, the motherboard may need to be replaced.

Problem #2: Galaxy S7 “SD Card: For transferring photos and media” error

I have a Samsung Galaxy S7 and have had it since last September without any issues until a few days ago when I started getting notifications constantly about my SD card saying “SD Card: For transferring photos and media.” Ever since that, my phone has had lagging issues and has frozen multiple times. I’ve been researching and trying all things listed on the net without prevail. I formatted my SD card from my phone and it said it was complete but it still had all the items on it. So I connected it to my computer and it said there was an error but it couldn’t fix it. I then tried to format the card from the computer but could not be completed so I guess I’m just asking if there is any other possible outcome to try. Or am I looking at a corrupted SD card or a handset problem?? — Adam

Solution: Hi Adam. This is most probably just an SD card issue. The simplest thing that you can do to check is by using another known working SD card. If the second SD card works, then your old one may be corrupted or damaged. If you can’t reformat it using your S7 or any other device (computer or another smartphone), then you have no choice but to replace it.

On the other hand, if the second SD card also fails when inserted in your S7, you should do basic software troubleshooting by wiping the cache partition and/or performing a factory reset. Here’s how both of these processes are done:

Delete System Cache

Minor firmware and hardware glitches can be fixed by deleting the system cache. In fact, we technicians always recommend doing it before performing any of the reset procedures:

  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.

Perform a factory reset

Factory reset is a drastic software solution as it reverts all software settings to their default state and erases all user data from the storage device. Make sure that you create a back up of your photos, videos, music, etc before doing this process.

  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.

Problem #3: Galaxy S7 active won’t power back on

I am having some issues with my Galaxy S7 active. Two nights ago I was using my blue tooth in my car, with my phone. when I got home I exited out of it and got a Samsung flash and my phone went dead. could not get it to turn on. put it on my charger it said it had 0% power so charged it all night and it was fine. made a couple of calls during the day, and went to work, put my phone in the office, checked it 4 hrs later to see if I had any missed calls, nothing, black screen. I tried to charge it at work but it wouldn’t charge. I went home tried my charger at home but still nothing; wont turn on and just black screen. I tried all of the tricks, holding volume button, home button, turn on button together, nothing. Went to AT&T, salesman said he had no idea. He tried to boot it in safe mode, and all the tricks. nothing. now I had to switch back to my old phone until I can take it somewhere. I am afraid I am going to lose all my pictures, videos, etc. No I didn’t not drop it, get it wet etc. Please help. — Christene

Solution: Hi Christene. For an issue like this, the only thing a user like you can do is to check whether or not you will still be able to turn the phone back on, either normally or to other boot modes. If you can’t do that, there’s virtually nothing more that you can do to fix it. This also means that you will most likely lose your photos and videos. Just to be on the safe side, here are the exact steps on how to boot your S7 to other modes and the follow steps that you must do if you can power the phone back on to any one of them:

Boot in Recovery mode:

  1. Charge the phone for at least 30 minutes.
  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. You can either wipe the cache partition or do a factory reset when in this mode.

Boot in Download Mode:

  1. Charge the phone for at least 30 minutes.
  2. Press and then hold the Home and Volume DOWN 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 DOWN keys.
  4. Wait until the Download screen appears.
  5. 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.
  6. Use Google to look for a guide on how to do it.

Boot in safe mode:

  1. Charge the phone for at least 30 minutes.
  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.
  6. 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 #4: Galaxy S7 black screen of death issue

I have a Samsung Galaxy S7. No water damage, drops, etc. I charged it overnight and woke up to the black screen of death and blinking blue light. I’ve tried the hard reset (power/volume down), factory reset (home/volume down/power), and every other button combination in a vain attempt to reset it. Nothing lets it restart and the blue light never stops blinking. I’ve taken it to the Sprint, Geek Squad, and an independent repair store and no one has any idea what’s going on with it. When I attach it to a computer, the computer recognizes it as a device (i.e. it makes a be-de-boop noise) but doesn’t recognize any drivers. I’m not just waiting for the battery to slowly drain, but I’m sure it can last awhile since the only thing on is that stupid blinking blue light. All my important stuff is saved to Google, so I don’t care about losing data. I just want a phone that works.         — Heather

Solution: Hi Heather. A black screen issue in this case may be caused by a damaged screen assembly. The blue blinking light is a sure indicator that this is not a boot problem as the phone is clearly powered on. Kindly send the phone to Samsung so the screen can be replaced.

Some adventurous users may resort to replacing the screen assembly themselves but we advise you against doing it. Parts replacement must be preceded by a series of basic and/or advanced tests to make sure that the problematic part/s are identified. Such exercise requires a solid understanding of hardware troubleshooting and knowledge. You also need some tools to do the job, obviously. Not doing proper diagnostic tests before doing a replacement may result to more problems. If you want to do the screen replacement yourself, you can use Google to find websites that provide step-by-step instructions. Our blog does not provide Android hardware troubleshooting and solutions.

Problem #5: Galaxy S7 screen won’t turn on

Got an S7 last week which was already in black screen. I’ve went to charge it quite a few times and have had very little success with it. I get a little flash here and there. Had the little green light pop up for 5 minutes once, then I had to head out so unplugged it. It has yet to come back to any sorta life. I’m able to pop the top section off , so i checked out all the connections, brushed the connections and even bent the prongs (where they touch the gold connector for power button) up on the board to see if that would do the trick to at least have it turn on. Have lifted off the charging port board to see if anything was dirty or loose and nothing. I have disconnected the battery and left it for a day and reconnected in hopes that it would jog the system and start charging or at least give some power to the device. Haven’t been able to have any power go through it to even flash the firmware to get it back and going. What else is there really to do now? — Charles

Solution: Hi Charles. You didn’t mention the circumstances how you get your phone but we believe that, like Heather’s case above, you have a malfunctioning hardware. That said, we suggest that you let a professional check the phone so you’ll know if it can still be used after a repair or not. If you’re lucky, only the screen may be damaged and its replacement can be the only way to allow you to use the phone again. We understand you probably have some background in electronics and have the tools to open the phone up but screen replacement, although not an uncommon issue with smartphones today, still requires some specialized knowledge to do. Sure there are tons of Youtube videos you can follow but some of them are not that reliable. If you really want to do a screen replacement yourself, checking ifixit.com is a good first step.

Problem #6: Galaxy S7 edge won’t charge

Hello. Last night, I was charging my Galaxy S7 Edge as I always do. The phone was charging just fine. However this morning I woke up to my phone being dead. I went to make sure the cord was still plugged in and it was, as was the charger. The charger was plugged into a surge protector, and I noticed the surge protector had been switched off. I’m not sure if a shirt or something had fallen on in, switching protector off, or if it was something else. Now whenever I plug my phone into a charger, the charge symbol will show up, but then it will disappear. It will not show it is charging. I have tried 3 cords, 1 not a fast charger, and 3 different outlets, none of which are a surge protector. My phone has installed 3 updates in the past month and a half, but i do not believe this is the source of the problem. Help me Obi-Wan Kenobi! You’re my only hope! — Jonathan

Solution: Hi Jonathan. First of all, it’s interesting to note that your surge protector powered off by itself as normal, working ones do not turn off by themselves. There must be something that triggered it to power down during the night and we hope that it’s not a huge power surge. We hope your surge protector did the job of protecting your phone from unexpected power surges as they can usually fry the charging port or the motherboard for good.

Secondly, a lot of times, charging problems like this one can be caused by a bad charging port. Sometimes, lint or dirt can go inside the port and prevent contacts from linking with the charger properly. Try to use some magnification to see inside your phone’s charging port to see if there’s any bent pin or dirt. If you something that does not belong there, use a can of compressed air to clean the port. Avoid bending a pin in the process. If cleaning the charging port won’t change anything, consider sending the phone to Samsung or to a third party service center.

 

 


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