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Horizontal or Vertical Lines - TV

Troubleshooting Commercial TVs, Healthcare TVs, Hospitality TVs, TVs Last Updated 09/05/2015
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.

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

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, then the external device may need service.

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