Galaxy J7 won’t boot normally, stuck in Samsung logo screen, random reboot issue, other issues

For you guys with #GalaxyJ7 issues, this post may be of help. We cover 4 common power/boot issues in this article so hopefully you’ll find it useful.

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 J7 shuts down on its own when battery is low

Please help. me i paid a lot of money but nothing is right. so My phone keeps shutting down on 20% then 30 then 40 then 50 then 70 then 90 then 100. i thought it was because of the battery. So then i bought another motha fuckin’ battery for $25. it seems that it is still shutting down. Please help.

I also noticed that when charging it reduces like it’s 90%. i remove the bloody charger it goes to 88% help please. — Dany

Solution: Hi Dany. Like in most Android issues, your problem can be due to either a software malfunction or hardware malfunction. Since you did not indicate that you’ve done any software troubleshooting at all, below are the steps that you must try.

Wipe the cache partition. Android uses a few special sets of temporary files called caches to work. One of these caches is called system cache which is stored in the cache partition. Sometimes, this cache gets corrupted following an update or app installation, resulting to problems. To ensure that it stays fresh, you must clear the cache partition from time to time. This step can be done safely and won’t result to data loss. Here’s how to refresh it:

1. Turn off the device.
2. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
3. When the device logo screen displays, release only the Power key
4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
5. Press the Volume down key several times key to highlight wipe cache partition.
6. Press the Power key to select.
7. Press the Volume down key to highlight ‘yes’ and press the Power key to select.
8. When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
9. Press the Power key to restart the device.

Battery recalibration. Another good troubleshooting step that you must do in this case is battery recalibration. This is important since you got a new battery and there’s a possibility that Android may not be detecting its actual remaining power levels. This is a simple troubleshooting step but you must invest some time to do it.

1. Use the phone by playing games or doing tasks to hasten power discharge, until the phone turns itself off.
2. Charge the phone without turning it back on.
3. Wait until the battery says it is fully charged to 100%.
4. Wait for an hour before unplugging the phone from the charger.
5. Use the phone until battery reaches 0% percent. The phone should turn off by itself.
6. Recharge the phone to 100%, wait for an hour before unplugging it again.
7. The battery should now be recalibrated. Observe how phone works.

Install Android and app updates. In some cases, fast battery drain issues are caused by app incompatibility and/or software bug. To minimize bugs, be sure that your phone runs the latest Android version (we don’t know if there’s an available Android Nougat for J7s at this time). Also, you want to ensure that all your apps are up-to-date. Just open the Play Store app and hit UPDATE ALL.

Wipe the phone with factory reset. Doing a factory reset in this case is not a bad idea. In fact, it’s a critical step to help you determine if the reason for the trouble is software-related or something else. Here’s how to factory reset your J7:

1. Create a backup of your important files such as photos, videos, contacts etc. You can use Smart Switch for this task.
2. From the Home screen, tap the Apps
3. Tap Settings.
4. Tap Backup and reset.
5. If desired, tap Back up my data to move the slider to ON or OFF.
6. If desired, tap Restore to move the slider to ON or OFF.
7. Tap Factory data reset.
8. Tap Reset device.
9. If you have screen lock turned on, enter your PIN or password.
10. Tap Continue.
11. Tap Delete all.
12. Wait for the phone to restart.

Now that you’ve factory reset the device, be sure to see how it works. Do not install apps at this point so you’ll notice any difference in terms of battery performance. Let your phone run for at least 24 hours. Try to use it normally for SMS, calls, and some browsing using native apps. If the issue persists during this period, you know it’s not a software problem.

Send the phone in. It’s always hard to be without a phone for some time but if you’ve reached this point, this means that bad hardware is causing the current problem. This means that it requires a trained professional to determine the cause. It can be broken power management IC, a broken circuit, or just a general problem with the motherboard. If you’re lucky and the damaged component can be replaced, you may have a working phone normally again.

Problem 2: Galaxy J7 reboots randomly, won’t turn on unless plugged in

Hi. My phone is getting off automatically even though the phone has charge and when i am pressing the power button it’s not getting on and when i am connecting my phone to charger then only its starting again. Please help me with the issue. — Achutchowdary

Solution: Hi Achutchowdary. You may have a similar situation with Dany above so we suggest that you do our suggestions for him. If the issue remains even after you’ve factory reset the device, don’t forget to also check if it’s a battery problem by testing another known, working battery. You don’t necessarily need to buy a new one. If you know someone with the same phone, try to borrow his or her phone’s battery and insert it in your phone. If the problem stays, have the phone repaired or replaced.

Problem 3: Galaxy J7 not turning on unless connected to charger

Hi good day i have a problem with my Samsung Galaxy J7 (2015). It will suddenly shuts down and when I’m trying to turn it on, it won’t turn on not unless i plug it into a charger even its not yet battery low. I’ve been experiencing this for a couple of days already. I already did the factory reset but still the problem is there. Hope you can help me thanks. — Mary Fame Falconitin

Solution: Hi Mary. If your phone has been around (over a year old), it’s possible that the battery may have simply lost significant capacity to hold a charge. Lithium-based batteries like the one in your phone degrades even if you’re not using it. The more that you use, the faster it loses capacity. Everyday charging and discharging operations can eventually wear out the life of the battery.

Try a new battery just like what tell Achutchowdary. If that won’t fix the trouble, you can assume that hardware malfunction is causing it.

Problem 4: Galaxy J7 won’t boot normally, stuck in Samsung logo screen

Hi. I have Samsung J710F 2016 model. i was trying to unlock network but it’s stuck with security code. then I wipe out all data in recovery mode and restart. It’s now stuck in bootloop and restarting again just after Samsung logo. I tried to wipe out all cache partition and reboot, but still same problem. Please help it someone else phone. Thank you Regards. — Amit

Solution: Hi Amit. Be sure that you try factory reset via Recovery mode first to see if that will fix the problem. Here’s how it’s done:

1. Turn off the device.
2. Press and hold the Volume Up key and the Home key, then press and hold the Power key.
3. When the device logo screen displays, release only the Power key
4. When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
5. Press the Volume down key several times key to highlight wipe data / factory reset.
6. Press Power button to select.
7. Press the Volume down key until Yes — delete all user data is highlighted.
8. Press Power button to select and start the master reset.
9. When the master reset is complete, ‘Reboot system now’ is highlighted.
10. Press the Power key to restart the device.

If the phone remains stuck in Samsung logo screen, the bootloader may need to be reflashed. Below are the sample steps on how to flash a bootloader. Exact steps on how to do it in your phone may be slightly different so be sure to do some research on how to do it properly. The following steps are provided for general guidance only.

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.

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