Galaxy S7 charging erratically when using regular chargers after installing Nougat, other issues

Hello Android community! Welcome to another #GalaxyS7 article. As usual, we’re addressing the issues reported to us only. For those new to our site and wanting to know how to report their own questions, be sure to use the link provided below.

Here are the specific topics we’re discussing in this material:

  1. Galaxy S7 flickering screen | Galaxy S7 general flashing instructions
  2. Galaxy S7 screen icons becomes too big after an update
  3. Galaxy S7 home wifi won’t work
  4. Galaxy S7 stock messaging app keeps getting duplicate text messages
  5. Galaxy S7 unresponsive after installing Android Nougat
  6. Galaxy S7 Nougat update corrupted the SD card
  7. Galaxy S7 charging erratically when using regular chargers after installing Android Nougat

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 flickering screen | Galaxy S7 general flashing instructions

A few weeks ago my boyfriend did an update on his phone. I’m unsure of what he updated but I’m thinking his Android version. He says he didn’t like the layout of his phone afterwards so he did something…? To restore it back to what he previously had which is unknown which of the delicious yet frustrating android versions he had.. i would check, but I’m unable to do anything with the phone. 2 days ago a notification came up for the first time stating he had insufficient storage space so he moved a lot of files/apps over to the Sandisk card.

Last night he was on Skype and his phone sent a screenshot to the person he was talking to. my boyfriend did not take or send the screenshot and thought it was peculiar so clicked on the picture which I’m not sure if it was a link, hackers, or a corrupted file from a dodgy app, third party admin, dodgy downloads. Anyhow, so as he did that, the phone froze and started flickering a green white and black yet mostly green, with a locked frozen screen yet still responds to button pressing and when i plug it in the charger. i couldn’t swipe the screen to access factory data reset and he had already done a soft reset reboot and tried hard reset. Then i tried everything that i read on your post that the phone would allow me.

i managed to access safe mode yet still green flickering frozen.

I plugged it into a PC and i couldn’t access anything on the phone. The computer read it as a blank Samsung so I took out the memory card and put it in my phone, which asked me to format the corrupted SD card. scared of losing files, i put it in my PC which i was then able to view files.

So i went through everything looking for this screenshot and came across a notification as i went into a certain apps cached data.. then the PC failed to read the card and shut down and rebooted itself into safe mode, restoring itself back to last restore. So I’m guessing the file corrupted my laptop.

Then my bf managed to get the phone into the screen where you can choose to reboot factory reset, delete cache files etc. but we could hardly read the options yet we chose to delete cached files and then chose factory data reset yet nothing has improved.

Now it’s just flickering every now and then. i rung tech support and I’m not sure if they will cover this in the warranty. so I’m just curious as to if you can tell me or help me out here. Is there something i can do to absolutely wipe the phone of everything and reinstall the drivers or whatever and start again?

I’ve read you can download something like that but then how would i first wipe what’s on it now? i can’t even swipe the screen to unlock it to turn it off to do a reset or anything.

Sorry about the novel. I’ve just been up all night literally with no sleep, crawling up any avenue i read on Google yet only fails lol. I rung tech support and they say the phone may have to be taken to headquarters and fixed there, which is only 29 kilometers away from me. If i drive it there i can have it done the same day, but is it worth it? I’m not licensed. Can i possibly fix this at home? I’m not that tech savvy but i do surprise myself all the time when i can follow blog instructions from Google, yet I’m still stuck in the mud. Please if you can help me out im desperate. Thankyou in advance. Once again my apologies for the novel. — Kirra

Solution: Hi Kirra. Based on your problem description, it looks like the phone has a hardware problem. First of all, it’s not normal for a screen to randomly or regularly show any colored flickering. There’s no doubt that this is a hardware issue as factory reset did not fix it. When you factory reset an Android phone, you are basically wiping all user data, apps, and customizations from the phone, leaving only the software in its factory form. This means that everything is removed from the phone’s storage — photos, videos, downloaded documents, apps and custom settings — introduced after the phone was unboxed. If the cause of the problem is software related, factory reset should effectively remove it from the system. This means that if the screen flickering problem was being caused by a software glitch, the screen would have returned to normal after a factory reset.

The screen assembly on your phone is composed of three major parts — the LCD, the digitizer, and digitizer flex cable. The LCD is the monitor that displays the images while the digitizer is the thin layer on top of screen that converts your touch commands into digital signals. These digital signals are transmitted to the logic board via the flex cable. Flickering usually occurs when the LCD or monitor is damaged like after an accidental dropping of a phone or when it’s exposed to liquid. We are not aware any malware or virus that can cause a Galaxy S7’s screen to be damaged but if you think that’s the case, you can also try to flash the software to fully replace the existing one.

Flashing is the Android equivalent of installing a software. You can try to flash an older stock firmware to your phone to revert it back to its previous state. Like factory reset, flashing will wipe the phone’s internal storage device when it replaces the current operating system with a new one. We recommend that you flash Android Marshmallow instead of Android Nougat to see if it will make any difference. The steps on how to flash a software for a particular phone varies so we don’t provide them here. We suggest instead that you look for a good guide in Google on how to do it. If you are not familiar on how to flash a software, try to do some research on the subject first. There are tons of literature in the web that will help you enlighten about the general steps that you must take. Once you feel comfortable in doing it, that’s the time that you want to look for the right firmware for your phone.

Firmware, also known as ROM/Operating System/Software, is phone model-specific, meaning you can’t use one designed for a different phone model. Firmware is also carrier-specific, which means that you can’t flash a Galaxy S7 firmware from a rival carrier to your phone. Installing the firmware of Telsta’s Galaxy S7 to an Optus phone will not sure and is the surest way to brick the device. Needless to say, you want to know what the phone model of your phone first is before you want to look for a corresponding firmware. A good repository site for firmware is Sammobile. We recommend that you visit it first to get the firmware you need.

Problem #2: Galaxy S7 screen icons becomes too big after an update

I’m not sure what is going on with my phone. It updated last night and this morning it seemed to be ok, but it was slow so I restarted it. but when it restarted, all my theme and wallpaper settings had been reset and all the icons and everything on my phone are oversized, like it thinks I have a bigger screen than I do, so nothing fits. I tried to go in and rearrange my screens and change it back to 5×5 in hopes it would fix it, but it won’t let me change it. I have no clue what’s going, on but it’s cutting off parts of the screen since it thinks the screen is bigger than it is. I can’t soft reset it since the battery cover doesn’t come off. — Katrina

Solution: Hi Katrina. We hope that you created a backup of your phone before installing an update. If you didn’t and your phone won’t allow you to back your important files now, you will lose all of them in this troubleshooting.

The first thing that you want to do is to wipe the cache partition. This will ensure that you delete the current system cache and other downloaded items such as APKs (app installation files). The main goal here is to replace the existing system cache with a new one. Sometimes, issues can appear after an update because the system cache had been corrupted. To fix the issue, you want to delete the system cache so the system will be forced to create a new one afterwards. Here’s how it’s done:

  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.

Once you’ve wiped the cache partition, make sure to check the phone to see if it fixes the problem. If it doesn’t, your next step is to install available app and system updates. There may be an app that’s causing the problem due to incompatibility. Installing updates may help fix the problem. Make sure to check that ALL apps are up-to-date and compatible with the Android version on your phone. If you are not sure if an app is updated or compatible, visit its Play Store page or consult the developer.

Finally, if nothing changes, you want to restore all software settings to their defaults. If you haven’t tried factory reset before, here’s how it’s done:

  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.

Factory reset will erase all data in the phone’s internal storage. Make sure to back your files up before doing it.

NOTE: There’s a way to make screen icons and font size bigger under Settings. If you haven’t checked it before, be sure to set it to your desired size by doing the steps below (these steps are for Galaxy S7s running Android Nougat):

  1. Open Settings app.
  2. Tap Display.
  3. Tap Screen zoom and font.
  4. Change icon sizes and font sizes accordingly.

Problem #3: Galaxy S7 home wifi won’t work

We moved a couple of weeks ago. We had Xfinity Comcast Internet at our old home. Never had any problems connecting. Last week, we had to go with AT&T Internet. When I have my WiFi turned on, my Samsung Galaxy S7 edge says I have full strength connection, but no apps run well. All games says I’m not connected to Internet, they won’t connect to Facebook or Google Play. Any videos from Facebook, Netflix, Tumblr, etc won’t play. As soon as I switch back to my data, everything connects & runs fine. I can go to restaurants & other places, and it works fine. I’ve called AT&T several times. They say nothing is wrong on their end. Since I can’t have Xfinity anymore, I need to find out what is causing this problem. Thanks for any help. I’ve tried everything that I can think of. I’m tired of watching the spinning loading circle & using up my data. — Shann

Solution: Hi Shann. We’re assuming that you’ve tried checking if your wifi works fine with other wifi networks outside of your home at this time. If wifi works fine on other networks but not on your home AT&T network, the problem must be due to the configuration of your network. This means that your S7 may be blocked from connecting to the internet when you’re on your home wifi, or there’s a problem with your wifi that causes this issue.

If you are the administrator of your home wifi (and there’s no one that can reset it like that geeky teenager), contact AT&T support and ask them to help you reset all settings to default. The exact steps on how to do this varies by router so it’s best if someone with knowledge of your equipment walk you through the entire process. Resetting all settings to their defaults will ensure that there is no restriction or blocks created somewhere that may prevent your phone from connecting to the internet. Keep in mind that even if your is connected to the wifi, such connection may stop in the router level only. Think of your internet connection as a chain. Once the phone has successfully talked to the router, it must then be allowed to also communicate with remote services beyond the router to be able to connect to the internet. If the chain is broken because the router is blocking your device from going beyond your local wifi network, that may be the cause of your problem. Make sure that you exhaust all possibilities when talking with AT&T technical support to ensure that this does not happen. If you have other computers or devices connected to the same wifi network and they can connect to the internet fine, the problem must either be due to a router restriction or a phone issue. If you are 100% certain that the router is fine and there’s no block whatsoever, that’s the time that you want to troubleshoot the phone.

The first step that you want to do in this case is to boot the phone to safe mode. This will help you determine if a third party app has been installed and blocking the wifi internet connection. When the phone is in safe mode, only pre-installed apps and services will run so if wifi will work normally, that’s proof that one of the installed third party apps is to blame. To fix the problem, you must uninstall third party apps until the issue is eliminated.

If nothing will change after booting to safe mode, make sure that you install any pending app or system update. As mentioned above, doing so may be an easy fix for an issue like this. The phone modem’s firmware may be corrupted and installing an update may be the solution that it needs.

Like above as well, don’t hesitate to factory reset your phone should nothing change after doing the steps above. Again, be sure to back up your files before proceeding.

Problem #4: Galaxy S7 stock messaging app keeps getting duplicate text messages

Hi. Thank you for taking the time to read this. I have a Samsung S7, running Android 7.0.

I’m getting duplicate texts in the stock messenger app. I do have the auto combination enabled, which I am under the impression that when I get a text that is 3 messages long (example) I should receive the one combined total text message. That’s happening but I am also getting additional duplicates 1 of 3, 2 of 3, and 3 of 3 individual messages that follow. It’s mildly annoying getting the one… and then 3 more with same info later.

I’ve cleared the cache of stock message app. Reboot phone too. Neither helped. Can’t remove battery. Any suggestions or is what I’m experiencing exactly what auto combine option does — though that seems like a poorly intended function if a person was on a limited text plan; unnecessary use of texts. Thank you for any insight.        — Matt

Solution: Hi Matt. This is the first time that we heard of this problem so it may be an isolated case. It can easily be due to inefficient or poor firmware coding, or a network issue that coincidentally happens at this time. We suggest that you follow the usual dose of software troubleshooting for any update-related issue such as cache partition wipe, installation of app and system updates, booting to safe mode, and factory reset. If not one of them will help solve the problem, you can report the issue to your carrier (if you download OTA updates) so they can help you (if at all).

As a remedy, you can try to use a third party messaging app for now.

Problem #5: Galaxy S7 unresponsive after installing Android Nougat

Alright, S7 has been running pretty well …. until Nougat came last week. Apps were not behaving normally, occasional resets. Then about 2 days into Nougat reset to a black screen. Power button unresponsive, Power+Volume Down unresponsive, Power+VolUP+Home unresponsive, plugged into charger unresponsive. So I let battery drain completely and voila, plugged in to charger, hit power and battery showed up on screen. Charged for a bit then did Power+VolDwn and was back in business …until the evening, it did the same thing, it crashed to black screen with blue light this time … but unresponsive to everything. Did a battery drain, and charged with Power+VolDwn … and it booted. Did a hard reset, started reinstalling, but crashed an hour later. Battery drain, charged, Power+VolDwn … took out SDcard did hard reset. And it works but crashes every few minutes. When it crashes, it is able to reset itself 3 out of 5 times, and 2 out of 5 the Power+Dwn button reset it. Tried doing the VolUp+Power+Home … Samsung screen and let go of power button only, says Android updating, then gives Dead Android guy with triangle and exclamation saying “no command” but continue holding home+VolUp and I get to Recovery Screen. Have tried another Hard reset, and wiping cache. In the end, left with phone with no additional apps which still crashes about 3 times every hour. I did call my carrier when I the Black Screen of Death was unresponsive and I am sending it in for repair … they’ll give me a cheap replacement phone. Sigh. — Mark

Solution: Hi Mark. It’s hard to diagnose your issue especially that we don’t know its full history but an issue like this may be caused by a bad bootloader. Since factory reset did not improve anything, the only other choices you have now includes flashing the bootloader and the firmware. Both procedure can brick your phone though and may invalidate the replacement order you’ve put in so it’s up to you if you want to try them or not. Flashing is obviously a fix for a possible software cause so it won’t be able to solve the problem is the true cause is hardware in nature.

If you haven’t tried manual flashing before, make sure to do some research how to do them so you’ll become familiar with the general steps for each one. The specific steps vary for every phone model so make sure that you follow a good guide. We don’t provide flashing specific guides in our blog but you can refer to the general steps below on how to flash the bootloader first:

  1. Look for the correct firmware for your phone model and download it. Make sure that select the right one. It should be the same exact firmware that ran previously on your device. We assume that you list down the firmware version somewhere. If you did not take note of it before, there’s a chance that you may pick the wrong one. As you may know now, using an incorrect firmware can cause complications so good luck with that.
  2. Let’s now say that you have identified the correct firmware. You then want to download it to your computer. The firmware file should have a bunch of files in it like AP_, BL_, CSC_, etc.
  3. Look for the file that starts with a label BL; this should be the corresponding bootloader file for this firmware. Once you’ve identified the bootloader file, copy it to your computer’s desktop or to any other folder that you can easily access.
  4. Proceed with the rest of the flashing procedure using the Odin program.
  5. In Odin, click on the BL tab and make sure to use the bootloader file you’ve identified earlier.
  6. Now, make sure that the “Device Added” status and its “ID:COM box” has turned blue before hitting the START button. This will initiate the flashing of your phone’s bootloader.
  7. Restart the phone once the procedure is finished.

Problem #6: Galaxy S7 Nougat update corrupted the SD card

On March 17, 2017 my phone alerted me that I had a software update, so I proceeded as usual. After the update was complete it said it was auto syncing messages. That message appeared on my notification bar for 24 hours. During that time everything on my phone was fine. Once the “sync” was completed, all of my photos disappeared and my phone notified me that my and card was corrupt. When I plugged my phone into my laptop to see if I could pull my photos that way, photos of people I don’t even know came up. Super creepy. I called AT&T and the lady said they have never heard of this. We tried putting the SD card in my laptop, we tried it in another phone, we tried a soft reset. Nothing worked. The AT&T lady said for some reason the update fried my SD card. That’s it. Hundreds of photos just gone. Any ideas? — Paige

Solution: Hi Paige. We’re sorry to hear about what happened to your photos. If no device can read the SD card right now, that means that all contents in it are gone. There’s just no way to reverse what happened and create a copy of those files at this time.

Regarding the sync issue you encountered, it may be a coding issue with the firmware so make sure that you do the basic troubleshooting like wiping the cache partition and factory reset. Steps for them are provided above.

To prevent losing data in the future, make sure to make it a habit to always create a regular backup of your files. Also, be sure to backup irreplaceable files before installing any Android update.

Problem #7: Galaxy S7 charging erratically when using regular chargers after installing Android Nougat

Hey there, i have an S7 and Samsung charging block/cable (two, actually). with both chargers, when i connect my phone, the phone quickly cycles (2 or 3 seconds) between charging, fast charging, and then not charging. it repeats this until the charging plug is removed from the unit. i thought it strange, and discovered that my Anker portable charging bank connects and charges fine. This solution works for my lifestyle, so i moved on. A visit home came with the discovery that my mother’s phone, also an s7, is behaving the same with one of her two charging block (again, both Samsung). we both bought the phones in August, and we bought the same secondary chargers from Amazon, but they at least appear to be official Samsung chargers (potentially they could be really impressive fakes). It seems the problem began after the nougat update for me, but before the update for my mother, so i ruled out a firmware issue…. not sure what’s up here. Thanks for hearing me out and helping 🙂 — Anthony

Solution: Hi Anthony. Like the case of Paige above, this issue may be an isolated case and may only be limited to a particular carrier-provided firmware (assuming your mother’s phone is downloading the same firmware version from the same carrier). Since your phone charges fine with a portable charging unit, you can rule out possible hardware issues such as a malfunctioning charging port and bad battery. This must only be a firmware problem. If wiping the cache partition and factory reset won’t solve the problem, be sure to report the glitch to your carrier so they can, in turn, inform their developer team about it. There may not be an immediate solution for it but reporting it for now is the best thing that you can do. Let’s just hope that the firmware developer of your carrier will act on it in time so a patch can be released.


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