tcl roku tv horizontal lines on screen

Well, the TCL Roku TV horizontal lines on screen are frightening, but actually easy to solve!

The horizontal TV lines can be caused due to a malfunction with the display, or more likely problems such as outdated firmware or power issues.

To unwrap the details of the horizontal TV screen lines, in this guide, we’ll address everything and help you solve the issue in no time.

To fix horizontal lines on the screen of your TCL Roku TV, unplug it from power for 60 seconds and inspect the video input ports. If the issue persists, update the TV’s firmware and perform a factory reset if necessary.

Let’s unwrap some essential information…

Why Is TCL Roku TV Scrolling Horizontal Lines Constantly?

scrolling horizontal lines constantly

The majority of users who had horizontal lines on their TCL Roku TV screen admitted that the problem had occurred after a software update.

If you’ve recently uploaded the latest version of the Roku OS, it is possible that the firmware files are bugged, corrupted or the update failed.

Let’s also explore the other possible causes for the persistent horizontal lines:

  • Corruption firmware/software files of the TCL Roku TV.
  • A power income inconsistency with the TV equipment.
  • Wiring problems or a malfunctioning video/audio cable.
  • The broadcast or the source’s feed has horizontal lines.
  • A hardware fault with the TCL Roku TV or a bad display.

How to Know When My TV’s Display Is Damaged?

tv's display is damaged

There are a couple of signs apart from the horizontal lines that will help you find out whether the display of the TV has sustained lethal damage.

Here are the signs of a damaged TV screen:

  • The display is taking too long to illuminate completely.
  • The screen of the TV looks dull or fades out randomly.
  • A visual crack or burnt pixels on the display of the TV.
  • The TV display is blinking or only shows only one color.
Alert: Any recollection of a TV screen impact, shouldn’t be ignored.

TCL Roku TV Horizontal Lines On Screen – Proven Solutions!

1. Hard Reset the TCL Roku TV!

hard reset the tcl roku tv

To resolve any potentially temporal issues with the TCL Roku TV, it is recommended to conduct a hard reset process.

The hard reboot is a type of power reset, that does not erase any content or information stored on the TV, but resets the hardware and the cache of the Roku TV’s OS.

Follow these steps to conduct a hard reset on the TCL Roku TV:

  1. Press the power button on the Roku remote control.
  2. Once the TV has shut down, unplug the power cable.
  3. Wait for 60 seconds while the Roku TV is disconnected.
  4. Then, connect the TV directly to the wall power outlet.
  5. Press the power button on the remote and test the TV.

Inspecting the Power Equipment!

While waiting for the hard reset to take effect, you could inspect the cable connections and power equipment of the TV in the meantime.

inspecting the power equipment

If there’s a power issue with the TCL Roku TV, you should be able to spot it easily simply by inspecting the power adapter and electrical outlet.

  • Test by connecting the TCL Roku TV device to an alternative electrical outlet!
Tip: To test if an electrical outlet is functional, attempt charging your mobile device there!

2. Change the TCL Roku TV Input

change the tcl roku tv input

The problem might be occurring due to a malfunctioning TCL Roku TV input.

To eliminate the horizontal lines on the screen, you must alter the selected input through the settings interface of the TCL Roku TV, using the remote control.

Here’s how to change the input on the TCL Roku TV easily:

  1. Press the “Home” button on the Roku remote control.
  2. Tap the left arrow on the remote to display the menu.
  3. Go to the “Settings” option and press the “OK” button.
  4. Press the downward arrow and highlight “TV Inputs”.
  5. Press “OK” on the remote control and alter the input.
Info: To lock in your selection after highlighting the desired input, press “OK” and exit the menu.

3. Inspect the HDMI Connection!

inspect the hdmi connection

The horizontal display lines primarily occur whenever there’s an HDMI device connected to the TV.

If the cable connection is not in proper condition or the cable hasn’t been connected to the correct input port, the horizontal lines are most likely influenced by the external device.

How to Inspect HDMI TV Port?

A malfunctioning HDMI TV port could result in the horizontal lines you’re seeing on the display.

Unplug all HDMI cables from the back of the TV and inspect the ports for any damages, obstructions, or dust accumulation.

If necessary, clean the ports without using any water!

How to Inspect HDMI Cable?

how to inspect hdmi cable

Bad HDMI cable is the primary cause of the horizontal lines. So, Inspect the condition of all connected HDMI cables on the back of the

TV and the connectors too. When an HDMI cable goes faulty, the video transfer will be impacted, resulting in a weird line on the TV’s screen.

Alert: Do not keep any damaged cables in the configuration of the TCL Roku TV!

4. Update TCL Roku TV Firmware!

update tcl roku tv firmware

One possibility is that the horizontal lines are occurring due to outdated Roku OS firmware.

In order to fix a problem of this type, you must update the firmware of the TV to the latest available version through the firmware configuration options in the settings of the device.


The TCL Roku TV must be connected to the internet in order to conduct a firmware update. Before checking out the instructions below, go to Settings > WiFi and check if it’s connected.

Here’s how to update the firmware of the TCL Roku TV in easy steps:

  1. Navigate to the Settings of the Roku TV from the home screen.
  2. Highlight “System” press “OK” and then go to “System Update”.
  3. In the following tab, select “Check Now” and wait for 30 seconds.
Info: The TCL Roku TV will start searching for newer firmware versions available. 

If one is found, an “Update” button will be available for pressing in the “System Update” menu.

5. Unplug ALL Peripheral Devices

unplug all peripheral devices

The horizontal lines could be caused by the input video feed coming from a third-party device connected to the TCL Roku TV.

All devices connected via HDMI, coax, or component cables might be causing a conflict, which is visualized by horizontal lines on the TV screen.

These devices involve cable TV boxes, cable TV, antennas, satellites, consoles, or anything that is not the raw TCL Roku TV TV playout.

So, disconnect all devices plugged into the back of the TCL Roku TV and determine if the horizontal lines would still be there. 

Tip: Once all peripheral devices are unplugged, power off the TV for 30 seconds!

6. Restore the TV Factory Settings

restore the tv factory settings

It is possible that the horizontal lines are related to a software issue of the TCL Roku TV.

In order to fix any underlying complications with the software files of the TV, it is recommended to conduct a factory reset process.

Alert: The factory reset erases all content, settings, and data on your TCL Roku TV!

This is how to factory reset the TCL Roku TV in easy steps:

  1. Make sure that the TV is turned on.
  2. Press the “HOME” TV remote button.
  3. Navigate and access the TV settings.
  4. Scroll down to “Factory data reset”.
  5. Press “OK” and “Erase everything”.
  6. Confirm the reset by selecting “Yes”.
Info: The factory reset of the TCL Roku TV may take up to 3 minutes to complete!

7. Test Different Streaming Apps!

test different streaming apps

In order to draw a conclusion, you also need to test whether the horizontal lines are related to the display of the TV or to the content in a certain app.

In case you’ve been testing in only one app on your Roku TV, test whether the horizontal lines appear on other apps or on all TV apps.

Hardware Malfunction?

It’s not unlikely for the TCL Roku TV screen to become faulty, which typically results in weird display patterns, one of which is the horizontal lines.

The best way to address such a possibility would be by checking your warranty and taking the TV to the local merchant.

Best of luck!

Quick Recap:

Hence, to fix the TCL Roku TV horizontal lines on screen, you need to power cycle the device first and inspect all video/audio cable connections.

If the problem is still there, unplug all peripheral devices plugged into the TV and perform a factory reset process.

Follow our blog for more helpful technical resolutions!

Read Next: Why Does TCL Roku TV Keep Losing Connection?

Nicole B