Galaxy S7 restarts randomly, stuck in boot loop, fast cable charging stopped working

Today we discuss some common problems of the #GalaxyS7. We’ve been receiving an increasing number of boot loop cases so we feel the need to address it again here. We also pick a charging issue that involves fast charging in this one so we hope you’ll find our suggestions helpful.

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.

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.

Below are specific topics we’re bringing for you today:

Problem 1: Galaxy S7 fast cable charging stopped working

Problem I’m having is my Galaxy S7 SM 9:30 ft will not fast charge or should I say it will fast charge on the wireless but not on the cable. It stopped all of a sudden and won’t fast charge anymore, only cable charge and takes very long time. I tried almost everything from no device maintenance, resetting it, taking it back using the one off of Samsung store instead of the Google store that make a difference. I tried almost everything.

I don’t understand why it’s doing this. it went on and off a few times. I’ve worked and then didn’t work and I’m working and didn’t work and then all the sudden nothing at all.

Ever since the latest update software update I mean.

So can you please let me know what’s going on? if not do you know how I can test to see if it might be something in the port? but I highly doubt it because it worked and didn’t work and working didn’t work and when it did work I had nothing to do with the port even wiggle it around a little bit to see and took it in and out and then work for a while and then I was getting stopped again. Please get back to me. Thank you very much.

Again how would I test or see if the ports or is bad if that might be the problem? how can I know? Thank you. — Tom

Solution: Hi Tom. Due to the circumstances in your case, there are four possible reasons for your problem. These are the following:

  • bad charging port
  • faulty power management IC
  • software glitch
  • unknown hardware malfunction

Verify if charging port is broken

As far as troubleshooting the charging port is concerned, the most that you can do is an ocular inspection. The aim is to check if there’s a visible defect in the port and that’s it. If you can confirm that a pin is bent or damaged inside, you must let a professional fix it for you. In some cases, dirt or lint may prevent the charging cable from making good contact with the pins inside, causing charging problems. If you think there’s dirt inside the port, you can try to clean it using a can of compressed air. Avoid sticking something inside in order not to damage the pins.

Use another set of charging cable and adapter

One of the common reasons why fast charging cable suddenly stops working is a defective cable or adapter. Yes, you read that right. USB cables can get broken too. Make sure to try using a known working USB cable and adapter and see what happens.

Do a factory reset

Another troubleshooting step that you can do is to restore all software settings back to their defaults. In this state, your phone’s software has been validated properly and fast cable charging feature should be working normally. If your phone continues to fail to fast cable charge still after a factory reset, you can assume there’s something wrong with the hardware. In that case, you must have the phone fixed by Samsung.

For reference, here are the steps on how to factory reset your device:

  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 2: Galaxy S7 restarts randomly, stuck in boot loop

My Galaxy S7 gets stuck in a loop of turning itself off and on again. I have read posts on thedroidguy.com but not found anything that matches this issue. It happens when my phone is in use. It seems to get overwhelmed and just shuts off. At first it would happen when I was using apps like Snapchat and music apps but now even simple functions cause it. Sometimes a soft reset will fix this issue but at other times it’s turning off/on too fast to perform and at other times it continues to shut off right after the soft reset. — Anna Segal

Solution: Hi Anna. Boot loop, as this issue is called here, is a fairly common problem among many smartphones. Its cause can include

  • a third party app,
  • software glitch,
  • broken battery,
  • a bad power management IC, or
  • a general motherboard issue.

To know which of them is true, below are the troubleshooting steps that you should do.

Verify if a third party app is the cause

Some poorly coded apps can the exact problem you’re experiencing by interfering with how the operating system works. To check if that’s the case, you must restart the phone to safe mode and observe it. Here’s how:

  1. Turn your Galaxy S7 off.
  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.

While your phone is in Safe Mode, all third party apps will be blocked. If it works normally and the issue won’t occur while it’s in safe mode, it’s an app issue. To identify the problematic app, you must uninstall an app, and observe the phone. Repeat this process until you’ve isolated the cause.

Wipe the phone via factory reset

There’s no direct way to diagnose a software issue but it’s possible that the boot loop symptom right now is a product of one. To know that, you must do a factory reset. Be sure to create a backup of your files before doing this procedure.

  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.

Now that your phone has been factory reset, all software settings are returned to their known working state. This means that the device must turn on normally and stay so unless you shut it down intentionally. Be sure to let the phone run for at least 24 hours after a factory reset (when there are no apps installed) to know if the issue has been fixed. If the issue remains, proceed to the next troubleshooting steps.

Reflash the bootloader

One of the things that’s often not mentioned in most websites that discuss boot loop issue in Android devices is the possibility of a bad bootloader. Samsung uses a different software environment to prepare everything before it loads Android, the operating system. Sometimes, system updates, rooting, firmware flashing, or a combination of any of them can corrupt the bootloader, resulting to a boot loop issue. To fix the problem, you must reflash the bootloader to bring it back to stock. This step is often followed up by reflashing a compatible firmware (ROM) so be sure to do research on how to do each of them. Our guide below should give you a general idea on what to do. Exact steps for your particular model may vary though so be sure to consult other guides.

  1. Look for the correct firmware for your phone model and download it. Make sure that you 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.

Contact Samsung for additional support

If all the steps above won’t help in fixing the problem, that means that any of the rest of the possible causes (broken battery, bad power management IC, or general motherboard issue) must be to blame. Contacting Samsung must be your first option in this situation. If that’s not possible, let a third party independent shop do the repair for you.

 


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