How to fix a black screen on your LG G4?

How to fix a black screen on your LG G4?

One of the first things to check is the led that is at the top of the screen. In fact, when the LED is red or blue when the screen of the LG G4 remains black, it indicates that the device is turned on. In this situation, it is really likely that the problem comes from the screen.the screen may be damaged.In this situation, none of the tips below will work. You will then have to bring back the LG G4 to a repairer.

Check if there is a problem with the battery
There is a risk that the battery will be discharged and this is why the LG G4 does not turn on. In such a scenario, use the original LG G4 charger and plug your device into a wall outlet to charge it. Let it charge for about 30 minutes before trying to turn it back on. If the phone turns on, there is no problem with the battery of your device. In case LG G4 does not start even now, here's what you need to do.

Repair the black screen of your LG G4 by a factory data reset
 Make a factory reset of your LG G4. This will delete all the data on your smartphone. Therefore, we recommend that you back up your data.
Start by pressing the next three buttons simultaneously: the volume up button, the "Home" button (located at the bottom center of your device) and the "Power" button.
 The combination of buttons may vary depending on the model but should be one of the following:
     volume  button down + power button
     volume  button down + power button + Home
     volume  button up + power button
     volume  button up + power button + Home
     power button + Home button
During this manipulation, you will see a menu called "System recovery". Once in this menu, go to "wipe data" by using volume buttons to navigate this interface. Then go to "factory data reset" and confirm your choice by pressing the "power" or "Home" buttons. After doing this, your LG G4 will perform a factory restore. Let it restart and normally your device should work.

remove the battery from  LG G4
This sometimes helps to solve the problem of black screen. Wait several seconds, then replace the battery and try to start the smartphone. In case the screen is still blocked, go to the next step.

Remove the SIM card and SD card
It happens frequently, that the SIM card or the SD card conflicts with the LG G4 and generates a black screen. One of the tricks to try is to remove the SIM card and SD card. When it's ok, we'll have to try to restart the device. If it works, it implies that there is a conflict with the SIM or SD card.

Clear the cache partition
Clearing the cache partition is also an excellent technique and helps you clean your phone internally. Often we forget to organize and store things stored on our phone. Wipe the cache partitions comes to our rescue in such situations by getting rid of all unnecessary system files and application-related data that may be causing the problem.
When the LG G4 does not turn on, the only way to clear the cache partition is to boot into the Recovery Mode screen. here's what you should do:
Press the volume button down and the power button together until you see a screen with several options.
Once the process is complete, select "Reboot System now" which is the first option in the recovery mode screen.

Restart in safe mode
When the LG G4 does not start, try to start it in Safe Mode because it allows you to identify the real reason behind LG G4 does not turn on. Do this:
Turn off the LG G4. Now start the recovery mode. Select "Safe Mode".

Wait until the battery is empty
Finally, in the case where none of the previously seen alternatives works, you can try to let your battery run out. Make sure that the battery is completely empty. When it's done, connect your LG G4 to its charger and try to start the LG G4.