Some have reported that the Samsung Galaxy J3 will have a black screen after you have turned on the smartphone, even when the buttons light up like normal. The Galaxy J3 screen won’t turn on at random times for different people, but the common problem is that the screen fails to wake up.
There are several different ways to try to solve the Galaxy J3 blank screen issue. Follow the instructions below to learn how to fix the issue of the Galaxy J3 screen not turning on.
Boot to Recovery Mode and Wipe Cache Partition
The following steps will get the Samsung Galaxy J3 into Recovery Mode by booting the smartphone:
- Press and hold the Volume Up, Home, and Power buttons at the same time.
- After the phone vibrates, let go of the Power button, while still holding the other two buttons until the Android System Recovery screen appears.
- Using the Volume Down button to scroll, highlight Wipe Cache Partition and press the Power button to select it.
- After the cache partition is cleared, the Galaxy J3 will reboot automatically.
Read this guide for a more detailed explanation on how to clear cache on the Galaxy J3. 
Factory Reset Galaxy J3
If the method above didn’t help you fix the black screen problem on the Galaxy J3, then you should try to factory reset the smartphone. The following is a guide on how to factory reset the Galaxy J3 . It’s important to note that before you go to factory reset a Galaxy J3, you should back up all files and information to prevent any data from being lost, as the factory reset will erase all of your data from the phone, returning it to the state it was in when you first bought it.
Get Technical Support
If none of the methods have worked in trying to get the Samsung Galaxy J3 screen to wake up, it’s suggested that you take the smartphone back to the store or to a shop where it can be physically checked for any damage. If proven defective by a technician, a replacement unit may be provided for you, or it could be repaired.