How to fix Samsung Galaxy J7 (2017) that turned off and won’t turn back on [Troubleshooting Guide]

When a phone with really decent technical specifications like the Samsung Galaxy J7 suddenly turns itself off without apparent reason, there must be a serious problem with it. When it comes to power-related concerns, it’s often the battery or some hardware that has issues but there are also times when a firmware problem causes it. In other words, it’s not easy to determine what the concern is all about if we only have to look at the phone that turned off on its own.

Turning off without apparent reason isn’t really that bad. Do you know what’s worse than that? If the phone won’t turn on or respond after it turned off. And this is the kind of problem we will tackle in this post. We will look into every possibility and rule them out one by one until we arrive at a point wherein we can easily determine what the problem really is so that we can try to formulate a solution that might fix it. So, continue reading if you’re one of the owners of this phone that’s plagued by this problem.

Before anything else though, if you have other issues with your device, then visit our Galaxy J7 troubleshooting page for we have already addressed several common problems with this phone. Odds are that there are already existing solutions to your problems so just take time finding issues that are similar with yours. If you can’t find one or if you need further assistance, feel free to contact us by completing our Android issues questionnaire. Please provide us with as much information as possible so that it would also be easier for us to troubleshoot the problem. Don’t worry as we offer this service for free, so all you have to do is give us sufficient information about the problem.

How to troubleshoot Galaxy J7 that turned off and won’t turn on

Problem: This phone just turned off and didn’t turn on. I tried soft reset, removing the battery reinstall the battery as the instruction it didn’t work. I tried pressing and holding the volume down and power button, still not working. I think the battery is completely empty because it’s already 10 days after I searched for solution. But first it shows on my laptop it still recognizes but still shows black screen. I can’t charge or no charging signs. Now when I connect it to the computer there is a sound when I press the power button but after 2 seconds it sounds disconnected again. I really need help. Thank you.

Troubleshooting: In the problem I cited above, I understand the owner already tried doing some troubleshooting procedures. He’s even gone to the extent of removing the battery, which is unnecessary and risky, to no avail. This troubleshooting guide will walk you through in fixing this problem safely, we don’t want you to do things that can potentially damage your phone or void your warranty. With all that being said, here’s what I suggest you do about this problem:

Step 1: Force restart your Galaxy J7

Going through all the hassle of removing the battery from your phone that has no removable battery is unnecessary since you can just press and hold the Volume Down and the Power key for 10 seconds and the phone will simulate battery disconnect.

This simple procedure alone is enough to fix the problem provided it’s just a glitch in the system or the hardware. However, if the phone still won’t start after doing this, then move on to the next steps.

Step 2: Perform a visual inspection on your phone’s charger port

The phone turned off on its own so something must have triggered it. One of the most common cause why a phone turns off on its own is liquid damage. While your J7 is water-resistant, it’s still vulnerable to water and do you know what the most common entry point is? It’s the USB or charger port.

So, it must be the first thing you should look into. If you can find moist in it, get a piece of tissue and insert it. Leave the tissue for a minute or two to absorb all the moist. After making sure the charger port is dry, do a physical inspection with the charger and the cable. I know they don’t directly cause the problem but it’s necessary for the next step

Step 3: Try charging your phone

It’s imperative that you check your phone for possible liquid damage prior to this step so, after step 2, remove the SIM card tray and then look into the slot to find the Liquid Damage Indicator (LDI). It’s a small sticker that’s directly visible when you look into the SIM slot. If it’s still white, then your phone is free from liquid damage but if it turned red, pink or purple, you shouldn’t proceed with your troubleshooting because you might just ruin your phone even more. Instead, bring it to the shop and let the tech handle the problem for you.

However, if there’s no sign of liquid damage, then plug the AC adapter to a functioning wall outlet and then connect one end of the cable to it and the other end to your phone. If there’s no problem with the hardware, you should see the charging icon on the screen immediately or after a minute or two. And the LED indicator above the screen should also be lit up. However, if these signs doesn’t show, leave your phone charging for another 10 minutes but you have to check if it’s heating up becuase if it does, then disconnect it from the charger immediately and bring it to the tech.

Assuming the phone doesn’t heat up when charged but the charging signs aren’t showing, do the forced reboot procedure again by pressing and holding the Volume Down and the Power keys together for 10 seconds while the phone is plugged in. If it still won’t turn on after that, then move on to the next step.

Step 4: Try booting your phone up in Safe mode

If we can only boot the phone up in any mode, that would reassure us that the hardware is fine that’s the reason I want you to try to start it up in safe mode…

  1. Turn the device off.
  2. Press and hold the Power key past the screen with the device name.
  3. When ‘SAMSUNG’ appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see ‘Safe Mode’.

If you J7 successfully turned on and booted up in this mode, try to reboot it normally to see if it works this time but at least, at this point we know the phone is still capable of turning itself on. On the other hand, if the phone still refuses to turn on in safe mode, move on to the next step.

Step 5: Try booting it up in Recovery Mode

This is another environment and this time, we’re trying to boot the phone into Android system recovery, which serves as the fail-safe for almost all Android devices. If successful, you should try wiping the cache partition first and if that doesn’t work, you should so the master reset. Here’s how to do those things…

How to boot Galaxy J7 in Recovery Mode and wipe cache partition

  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.

How to boot phone in Recovery Mode and do Master Reset

  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 still refuses to turn on in Recovery mode, then it’s time to send it to the shop and let the tech fix the problem for you.

Connect with us

We are always open to your problems, questions and suggestions, so feel free to contact us by filling up this form. This is a free service we offer and we won’t charge you a penny for it. But please note that we receive hundreds of emails every day and it’s impossible for us to respond to every single one of them. But rest assured we read every message we receive. For those whom we’ve helped, please spread the word by sharing our posts to your friends or by simply liking our Facebook and Google+ page or follow us on Twitter.

2 Replies to “How to fix Samsung Galaxy J7 (2017) that turned off and won’t turn back on [Troubleshooting Guide]”

  1. i managed to stop the vibration by holding volume down and lock for like 10 seconds

    but now it wont turn on. i saw the simcard tray and i didnt find any white-red-pink-purple tape in any of the slots.

    what should i do and also how do i know if it is even from the water and not the system?(since it was vibrating like trying to power on)

  2. hi
    after just like 5 seconds being in the water my j7 2017 functions just right
    i dried it with a tissue and it was fine for 1 hour then it turns off
    now it is vibrating every 20-30 seconds (like how it is trying to turn on ) and sometimes some white bars appear on the upper half of the screen.my phone just got warmer since the accident and i cant pull out the battery.
    what can i do to at least stop it from vibrating?
    and how can i save this much of a damage?

Comments are closed.