What to do if your LG V40 ThinQ has a screen flickering issue

Screen flickering can be a sign of a serious hardware issue and some of our readers that own the LG V40 ThinQ contacted us regarding the problem. But here’s the thing, if your phone hasn’t been dropped on something hard and that there are no signs of physical and/or liquid damage, the flickering might be because of an app or firmware problem.

In this post, I will help you troubleshoot and determine what’s the reason why the screen of your LG V40 ThinQ is flickering. We will rule out every possibility until we can point out the cause of the problem. That way we would know what to do next. So, if you’re one of the owners of this device and are currently bugged by a similar problem, continue reading as this post may be able to help you.

For those who are looking for a solution to a different problem, drop by our troubleshooting page for we have already addressed some of the most common issues with this phone. Browse through the page to find issues that are similar with yours and use the solutions we suggested. If they don’t work for you or if you still need our help, contact us anytime through our Android issues questionnaire.

Going back to our troubleshooting, here are the things you can do if your V40 ThinQ has a flickering screen…

Forced reboot – before going any further, you must perform the forced reboot procedure because there’s always a possibility that the flickerings are a result of some minor glitches in the system. Those glitches happen all the time and the best solution for them is the forced reboot. Press and hold the Power button and Volume Down at the same time until the device powers off, approximately 8 seconds, then release. This will restart your phone like it normally does but it’s memory will be refreshed and its apps and services will reloaded. If the issue continues after this, then try the next procedure.

Restart your phone in Safe mode – we will now try to determine if the problem is caused by some third-party applications. By running your phone in safe mode, you’re temporarily disabling all downloaded apps and the services associated with them. Thus, if the flickering stops when the phone is in safe mode, then the next thing to do if find out which is the culprit and uninstall it. This is how you reboot your phone in safe mode:

  1. With the screen on, press and hold the Power key.
  2. In the options menu that displays, press and hold Power off.
  3. When prompted to restart in Safe Mode, tap OK.
  4. After your device restarts, it displays Safe mode at the bottom of the screen.

Wipe cache partition – there are times when the system cache gets corrupted or become obsolete and this may affect the overall performance of your device with minor hardware and software problems occurring from time to time. This could be the case with your device especially if the flickerings aren’t frequent. Don’t worry, none of your files and data will be lost because of this. Also, you’re not just deleting the cache but also replacing it with a new one and here’s how it’s done…

  1. From the Home screen, tap Settings.
  2. Tap the ‘General’ tab.
  3. Tap Storage > Internal storage.
  4. Wait for menu options to finish calculating.
  5. Tap Free up space.
  6. Tap Temporary files & raw files.
  7. Select the following options:
    • Cached data
    • Clip tray temporary files
    • Raw files from camera
  8. Tap Delete > DELETE.

Continue using your phone but be observant enough to know if the problem remained and if it did, then you must do the following.

Perform the master reset – this will bring your device back to its default settings and delete all your files and data that are saved in your device’s internal memory. So, make sure to make a backup before doing this. This will rule out the possibility that it’s just a firmware issue but if the flickering continued after doing this, then it could be a hardware problem. This is how to effectively reset your LG V40 ThinQ…

  1. Back up all data on the internal memory before performing a master reset.
  2. Turn off the device.
  3. Press and hold the Power and Volume down buttons.
  4. When the LG logo appears, quickly release and then re-hold the Power button while continuing to hold the Volume down button.
  5. When the ‘Delete all user data (including LG and carrier apps) and reset all settings’ message appears, use the Volume down button to highlight Yes.
  6. Press the Power button to reset the device.

If the flickering is still happening after this, bring the device to the store or shop so that a technician can check it up for you.


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Harold Hisona

Harold has been in the tech industry since 2008 when he started out as a tech support for companies like Time Warner, Comcast and Tracfone. He’s been troubleshooting phones when the smartphone industry started booming. During his tenure as a tech support, he’s already been writing for various tech blogs and doing some freelance SEO. In 2012, he joined a small team of bloggers to write for The Droid Guy, and he has been with the company ever since. Today, he doesn’t only write tutorials and troubleshooting pieces but also shoots and edits videos for The Droid Guy channel while trading stocks on the side. Contact me at Email

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