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Horizontal or Vertical Lines - TV

Troubleshooting TVs Last Updated 02/16/2017
LG TV Horizontal or Vertical Lines

When horizontal or vertical lines appear on the TV screen, identify the root cause by testing the TV picture, checking cable connections, and verifying external devices are working properly.


Try the following steps (also shown in the video above), then find possible solutions in the expandable sections below.

  1. Try different channels to see if the lines appear on all channels.

  2. If you see lines on all channels, try changing to a different input (or to an app), to see if the lines appear on those as well.

  3. If the lines appear on all inputs, run a picture test.

    1. Go to the Picture menu (Settings > Picture).

    2. Choose the Picture Test option.

  • In this case, the issue is likely with the TV itself, and may require repair service.

    Before requesting repair service, try to factory reset the TV. This will help determine if the issue is with software or hardware.

    1. Access the General menu (Settings > General).

    2. Locate and click the Reset to Initial Settings option.

    3. Follow the prompts to reset, then re-setup the TV.

    Note: You will be prompted for the TV's password. If you have not setup a password, the default will either be 0,0,0,0 or 1,2,3,4.


    Get started online quickly and easily using our Request a Repair feature.

    Request a Repair

  • Since some (or most) channels come in clear, the issue is not likely related to the TV's hardware or software.

    In this case, you are likely experiencing poor signal on those channels. Try the following:

    1. Using an antenna:

      1. If you enter Manual Tuning mode (Settings > Channels > Manual Tuning), you can see the signal strength of the channel you are on.

      2. If the signal is weak, check the alignment of your antenna. Sometimes a slight shift can clear up poor signal issues.

      3. If the signal is strong, that channel may be experiencing technical difficulties from the broadcast location.

      Note: There may be frequency related settings on the antenna that can be adjusted to improve its' performance. Otherwise, you may consider replacing the antenna.

    2. Using a satellite dish:

      1. Check for cloudy/stormy skies, or other obstructions that may hinder the satellite's signal.

      2. Also, try to unplug the satellite receiver to clear its' memory, then plug it back in and try again.

      3. If the issue persists, contact your satellite provider for further assistance.

    3. Using a cable box:

      1. Poor quality on some channels may be an issue with the cable box's software, or the broadcast provider's signal.

      2. Try to unplug the cable box, then plug it back in and try again. This will clear the cable box's memory.

      3. If the issue persists, contact your cable provider for further assistance.

  • You may have an issue with your input device (antenna, satellite receiver, or cable box), an issue with your cable used for that device, or an issue with the input board on the TV.


    First, try to use a different cable. This includes both the Coaxial cable that goes from the wall to the receiver (or directly to the TV in the case of antenna), and the signal cable that goes from the receiver to the TV (usually HDMI).

    If the issue persists with new cables, your next best course of action is to contact your cable/satellite provider, and ask for a new receiver (or replace the antenna if used). Since the other inputs are working properly, the issue is more likely to be related to the external device than the TV.


    If the issue persists after trying new cables and a new set-top box, your next step should be to have a professional repair technician diagnose the issue.

    Get started online quickly and easily using our Request a Repair feature.

    Request a Repair

  • In this case, the issue is likely with the TV's input board, and may require repair service.

    Before requesting repair service, try to factory reset the TV. This will help determine if the issue is with software or hardware.

    1. Access the General menu (Settings > General).

    2. Locate and click the Reset to Initial Settings option.

    3. Follow the prompts to reset, then re-setup the TV.

    Note: You will be prompted for the TV's password. If you have not setup a password, the default will either be 0,0,0,0 or 1,2,3,4.


    Get started online quickly and easily using our Request a Repair feature.

    Request a Repair

  • In this case, the issue is likely with the TV itself, and may require repair service.

    Before requesting repair service, try to factory reset the TV. This will help determine if the issue is with software or hardware.

    1. Access the General menu (Settings > General).

    2. Locate and click the Reset to Initial Settings option.

    3. Follow the prompts to reset, then re-setup the TV.

    Note: You will be prompted for the TV's password. If you have not setup a password, the default will either be 0,0,0,0 or 1,2,3,4.


    Get started online quickly and easily using our Request a Repair feature.

    Request a Repair

Performing a Picture Test determines the quality of the TV picture and whether the TV is working correctly. The picture should be free of vertical or horizontal lines.

  1. If the lines are present on the TV screen, press the SMART button Smart Button on the remote control and select Settings > SUPPORT > Picture Test.
    Picture Test
  2. This menu will appear on the test picture. Select which option best describes the result you have. There will be guidelines given to you on the TV screen, depending on which option you choose.
    Picture Test Support Test with problem

    If No is selected, then the following message will appear:

    If Yes is selected, then the following message will appear:

    No Error With Error

Note: If the lines are present when viewing an application, then contact the vendor of that application.

A bad cable, or a cable that is not securely fastened to the input/output ports, can disrupt the signal and cause horizontal or vertical lines.

  1. Verify that the cable in use is secured correctly at both the external device and the TV.

  2. If the horizontal or vertical lines are still present, then substitute the cable if you have a replacement. If the replacement cable resolves the issue, then no further action is required.

  3. If the replacement cable did not resolve the horizontal or vertical lines, then proceed to the External Devices section.

  4. If a replacement cable is not available, then proceed to the External Devices section.

For an external device connected to the TV, verify connections and settings are not causing horizontal or vertical lines.

  1. Check if the picture format settings for the external device match the settings for the TV.

    Aspect Ratio, screen resolution, and horizontal /vertical scan frequencies are settings that affect the picture display. Refer to the external device User's Manual to adjust the picture format settings.

  2. Once all TV and external device picture settings are set, reset the external device.

    1. Turn the external device off.

    2. Remove the power cord from the wall outlet or power strip.

    3. Wait 30 seconds then re-apply power to the device.

    4. Turn the external device back on.

  3. If horizontal or vertical lines remain on the TV, the external device may need service.

Author-Ryan

Ryan is a Home Electronics expert and author of this help library article. Please leave him feedback below about the page.

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