ONN Roku TV has lines on screen: How to fix

Vertical or horizontal lines on ONN Roku TV can emerge from minor glitches and hardware defects. In other cases, dust accumulation in the TV could cause this problem.

Generally, you must figure out why your ONN Roku TV has lines on the screen to make finding a solution easier.

Here are possible causes and their fixes.

1. Check and replace cables

HDMI or composite cables can cause lines on a TV screen for several reasons:

  • Faulty cables: Breakages or damages in cables can cause vertical or horizontal lines or distortions. Replacing the cables with new, high-quality ones can help resolve this issue.
  • Dust or debris: Dirt on cables or their terminals can disrupt the proper data flow between the TV and the connected device, leading to poor signal transmission.

Dust interference on cables can result in signal degradation, which eventually causes problems like lines, static, or distorted images on the TV screen. Clean the cables using a soft cloth or compressed air to resolve this issue.

  • Loose connections: When the cables connecting the TV to external devices are not securely plugged in, it can result in a weak or intermittent connection. Ensure all cables are firmly connected to their respective ports.

It is also helpful to invest in high-quality HDMI or composite cables. Low-quality cables may not provide adequate shielding against external electromagnetic interference, making them more prone to signal disruptions. Alternatively, replace the cables.

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2. Check for interference

Interference in cable connections can explain why your ONN Roku TV has lines on the screen.

When an external source of electromagnetic interference, such as cordless phones, wireless routers, or microwaves, affects the cable signal, it can disrupt the transmission and lead to distorted or garbled images on the TV screen.

To minimise interference:

  • Move electronic devices away from your Roku TV.
  • Use shielded HDMI cables to protect the signal.
  • Change the wireless channel on your router.

Also, longer cable lengths can increase the chances of signal degradation and interference, especially if they are not of high quality.

3. Check for hardware issues

A faulty display panel is a common hardware issue resulting in lines on the TV screen.

The display panel, also known as the LCD or LED screen, generates the images you see. If there is a defect or damage to the display panel, it can manifest as lines on the screen.

That could be due to manufacturing defects, physical damage, or panel ageing. Replacing the display panel might be necessary to resolve the issue.

But perhaps the common cause of lines on an ONN Roku TV is a faulty T-CON board. The T-CON, short for Timing Control, is responsible for processing and distributing the video signals to the display panel of the TV.

If the T-CON board encounters any issues, it can manifest as lines or distortions on the screen, meaning that it will have to be replaced.

ONN TV T-Con Board
A T-CON Board for ONN TV

A T-CON board is a small PCB board that drives the TV’s panel, translating the signal into a picture on the screen. To access the T-CON board, you need to remove the back panel.

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You will find a small board, normally at the top or bottom centre of the screen, with two wide flat cables that go directly to the screen. Unplug them, wipe them gently with a tissue, and put them back.

But if the board is faulty and wiping does not help, you must replace it. Consider seeking professional help.

4. Check the ribbon cable

A faulty, improperly connected, or seated ribbon cable can cause vertical or horizontal lines on ONN Roku TV.

A ribbon, flex, or flat cable is a thin and flexible cable connecting various components within electronic devices.

ONN Roku TV Ribbon Cable
An ONN Roku TV Ribbon Cable

The ribbon cable serves as a crucial conduit for electrical signals and data transmission between the different parts of the TV.

If the cable becomes damaged or starts to malfunction, it can result in various issues, including the appearance of lines on the screen.

The cable is delicate and can be easily damaged by bending, folding, or twisting beyond its specified limits.

Mishandling during installation, transportation, or routine maintenance can lead to the cable being pinched, torn, or partially severed. Such damage can interrupt the smooth flow of data, resulting in lines on the screen.

Ribbon cables have multiple pins that must be precisely aligned and firmly inserted into their corresponding connectors. If the cable is not correctly seated or properly secured, it can result in a weak or intermittent connection.

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Troubleshoot the ribbon cable by carefully inspecting the cable for any physical damage, such as tears or twists. If you detect any damage, replace the cable with a new one that matches the specific model and specifications of the TV.

If there is no physical damage, reseat the cable. Gently disconnect and reconnect it at both ends to establish a more secure connection.

However, avoid applying excessive force or bending the cable excessively during the process. If the problem persists, call a professional to help.

5. Reset your ONN Roku TV

Sometimes, you can fix black lines by resetting the ONN Roku TV.

Press and firmly hold the reset button at the back of the TV for about ten seconds. When the factory reset is complete, an indicator light or status LED will blink rapidly on most Roku devices. You can continue with the setup.

Have your say!

Which step helped you to fix the lines on your TV screen?

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