How to troubleshoot TV screen flickering

Last Update date : Apr 10. 2026

If you're watching TV and the screen flickers suddenly, you might wonder if something is wrong with your device. Fortunately, in most cases, you can check and fix the problem with just a few simple steps. Learn what to do step-by-step to fix your flickering TV screen.

  • On 2022 and later TV models: Navigate to All Settings, then select Support, then select Device Care, and then select Self Diagnosis. Select Picture Test, select OK, and then view the test. You can select Yes if the picture looks normal, No if there is a problem with the picture, or Show again to see the picture a second time.
  • On previous TV models: Navigate to Settings, select Support, and then select Self Diagnosis. Select Picture Test, and then follow the on-screen directions.

    If the picture is flickering in the picture test, visit the Support Center to request service. Make sure you have the TV's model code, software version, and serial number when calling.
  • Important: Certain models only have an HDMI test after receiving a software update, and older models may not have it at all. If your model does not have this test or is not connected by HDMI, skip to the next step.

    Some TVs have an HDMI cable test. The test is designed for HDMI cables less than 2m long and may not produce good results on longer cords.
  • On 2022 and later TV models: To perform the test, navigate to All Settings, then select Support, then select Device Care, and then select Self Diagnosis. Select HDMI Troubleshooting. Select the HDMI connection you'd like to test, and then follow the instructions on the TV.
  • On previous TV models: To perform the test, make sure the TV's source is still on the HDMI setting for the cable you want to test, and then navigate to Settings. Select Support, select Self Diagnosis, and then select Signal Information. Select HDMI Cable Test, and then select Start Test.

    If the test says there is an issue with the cable, replace the cable. Service is not required.
  • The electrical wiring in your wall has enough power going through it that disruptions can actually affect your TV's image quality, most frequently through flickering.

    To rule out grounding issues, unplug all other devices plugged into the same circuit as the TV; this may include more than just one power outlet depending on how your house is wired.

    With the TV on its own circuit, try playing a video from an internal source, like an app or USB drive.
  • If the flickering happens even when the TV is on its own circuit, visit the Support Center to request service.
  • If the flickering stops, plug your devices back in one at a time and check which one is causing the flickering. If one of the devices is the cause of the issue, it may have bad grounding.

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