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LG TV Vertical Lines On Screen

If you were watching TV and vertical lines appeared on your screen out of nowhere, do not get alarmed as this can happen due to multiple technical reasons. Before running off to buy a new TV, I suggest you read on to find out what causes vertical lines to appear on your LG TV and what can be done about it.

Watching TV using streaming apps

Vertical lines can appear on your LG TV screen if the TV is connected to a power source through a faulty cord, the HDMI cable is either damaged or not properly attached, or the LCD panel of your LG TV is defective. These issues can be fixed by checking and reconnecting the cables, running a picture test, or updating or resetting your LG TV.

As serious as this issue may seem, it can be caused by something completely minor which can be resolved with just a little tweaking. We have put together a list of reasons why this issue occurs and what you need to do to fix it.

Why Are Vertical Lines Appearing On Your LG TV Screen

A few things can cause your TV display to malfunction and make vertical lines appear on your TV screen. These may include a defective power cord, an ill-attached HDMI or any other external cable, or a damaged LCD panel.

Reason 1: Faulty Power Cord

If the power cord of your LG TV is damaged or faulty, vertical lines may appear on the TV’s screen. It is not uncommon for the power cord to become faulty, especially over time, if dust or debris accumulates. You can try and clean the wires and see if it resolves the issue or buy a new wire altogether.

Reason 2: Poorly Connected HDMI Cable

Plugging HDMI cable into the back of a TV

Another reason for black/white vertical lines to appear on your TV is an HDMI cable or external device that has not been properly connected to your LG TV. If the HDMI cable is not correctly attached to your TV, it causes interference. This interference leads to vertical lines emerging on your TV screen.

Reason 3: Outdated LG Software

When the software of your LG TV is in need of an update and the required updates are not installed, the TV starts to act up. Vertical lines on the TV screen are one of the results of this. You need to ensure that the system software is up-to-date and not the culprit here.

Reason 4: Defective LCD Panel

The issue that makes the most sense to occur here is the issue of a defective LCD panel. If the LCD panel of your LG TV is defective, vertical (or horizontal) lines are bound to form and appear on your TV. If this happens, you should call a professional for help or call LG Support to help you deal with this problem.

6 Simple Fixes To Vertical Lines Appearing On Your LG TV

TV screen and app row

So we have shed light on what may have caused the issue to come up. We can now talk about how these issues can be resolved. Following is a list of six very simple steps to guide you through the process of solving the problem of vertical lines appearing on your LG TV.

Fix 1: Check The Power Cable

Power cable plugged into wall outlet

This one’s pretty easy. You need to check the cable connecting your TV to a power source. If this cable is not securely fastened or is damaged, it is likely that vertical lines will appear on your LG TV. If dust has been collecting on the cord, thorough cleaning of the cable using a wipe or tissue is recommended.

How To Check The Power Cable Of Your LG TV?

Follow the steps below to ensure you’re checking your TV’s power cord right:

Step 1: Hold the power button on your LG TV remote for about 15 seconds.

Step 2: After your TV turns off, unplug the power cord from the outlet.

Step 3: Clean the cable thoroughly before plugging it back again.

Step 4: After cleaning the cable, plug it back in your TV properly and make sure the cord isn’t loose.

Step 5: Turn the TV back on using the remote.

Fix 2: Check HDMI or External Devices

After making sure the power cable is not responsible for the vertical lines showing up on your TV screen, you need to check the HDMI or external devices connected to your LG TV. If the HDMI or any other external device is not properly connected to your TV, then the picture quality of your TV can be affected.

How To Check The HDMI Or External Device Connections To Your LG TV?

Here’s how you can check the HDMI or external device connections:

Step 1: Hold the power button on your LG TV remote for about 15 seconds.

Step 2: After your TV turns off, turn off the external device (if any are connected).

Gizmo Geek Guide uploaded this as an original article on May 13, 2023.

Step 3: Now, clean the HDMI cable thoroughly before plugging it back again.

Step 4: After cleaning the cable, carefully plug it back into your TV and make sure the cord isn’t loose.

Step 5: Turn the external device back on and after waiting 30 seconds, turn your TV on using the remote.

Fix 3: Update The Firmware

Now that we have ruled out the possibility that any cable or external device connections are not responsible for the issue, let’s get on to inspecting our LG TV’s software. The issue may have occurred due to outdated firmware. Updating the firmware may resolve any compatibility issues that are causing vertical lines to appear on your TV screen.

How To Update The Firmware Of Your LG TV?

Follow the steps below to update your TV’s firmware:

Step 1: Press the Home button on your LG smart TV remote.

Step 2: Select Settings → All Settings → General Tab → About This TV.

Step 3: Press Check For Updates and install if an update is available.

Step 4: After installing the update, restart your TV by unplugging it. Wait a minute before plugging it back in.

Fix 4: Run A Picture Test

LG’s smart TVs are equipped with a Picture Test feature. This feature allows you to check the picture quality of your TV and lets you see if the TV display is corrupted. If you run a picture test and the lines appear during it, then your TV might need a repair service.

How To Run A Picture Test On Your LG TV?

Running a picture test on your TV is pretty simple. Here’s how:

Step 1: Press the Home button on your LG TV remote and navigate to Settings.

Step 2: Select Settings → Picture.

Step 3: Click on Picture Test and observe if the lines appear on your TV.

Fix 5: Factory Reset

If none of the steps mentioned above work, you need to factory reset your LG smart TV. Factory resetting your TV will help remove any possible bugs or glitches within the TV that may be causing vertical lines to appear on your TV’s screen. Moreover, the TV will be restored back to its default settings. So if your TV’s display was acting up due to a change of settings, this will help fix it.

How To Factory Reset Your LG Smart TV?

Factory resetting your TV is an easy task. Here is how you can do it:

Step 1: Press the Home button on your LG smart TV remote.

Step 2: Select Setting → All Settings → General.

Step 3: Click on Reset to Initial Settings.

Fix 6: Check the LCD Panel

This might be hard to hear but if the issue has still not been resolved, then your LCD panel might be corrupted. If the LCD panel is defective, vertical lines appear due to a malfunctioning graphics system.

We strongly suggest that rather than opening up your TV yourself, contact LG support for assistance. LG support will check if the LCD panel of your LG TV is salvageable. If not, check if the warranty still covers your TV.

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Gizmo Geek Guide published this original article on May 13, 2023.

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