If your LG TV screen flickers or goes black, the broadcasting signal may be too weak or unstable.
Check the signal strength through the TV’s menu. If the signal is low, contact your service provider for assistance.
Flickering may also occur due to a TV-related issue.
Use the remote control to open the settings menu and see if it displays normally.
If the on-screen menu also flickers, please contact LG Customer Support for consultation and inspection.
Why is the TV screen flickering?
- A weak input signal can cause the screen to flicker, go black or display glitches.
- An unstable antenna connection or worn-out cables may lead to picture issues.
- Problems with the connection between an external device, such as a set-top box, and the TV can cause flickering.
- Internal component issues within the TV may result in flickering.
How to resolve TV flickering issues
Use the remote control to check for TV issues.
Press the settings or volume buttons on the remote control to check if the menu appears normally on the TV screen.
- If the menu displays correctly, the issue may be with the connected external devices (e.g. set-top box) or cables.
- If the on-screen menu flickers as well, the issue may lie with the TV itself. Please contact LG Customer Support for further assistance.
Inspect the HDMI cable or antenna connection.
- Turn off both the TV and any connected external devices.
Remove the HDMI cable from the back of the TV and then reconnect.
If possible, also disconnect and reconnect the HDMI cable from the external device. - Check the antenna cable for damaged or loose connections, as these can cause screen abnormalities.
Check the strength of the input broadcasting signal.
If the digital broadcasting signal is weak, the screen may flicker or go black.
Checking the signal strength
- TVs released from 2022 onward: [WebOS6.0~]: Remote control Settings [] button → [All Settings] → [General] → [Channels] → [Channel Tuning] → [Manual Tuning] → Select the connected antenna.
- TVs released in 2021 or earlier: [~WebOS5.0]: Remote control Settings [] button → [All Settings] → [Channels] → [Channel Tuning] → [Manual Tuning] → Select the connected antenna.
Steps for checking the signal strength on a webOS25 TV released in 2025
- 1. Press remote control Settings [] button → Select All Settings [] icon on top left of screen → [General] → [Channels].
- 2. Select [Channel Tuning].
- 3. Select [Manual Tuning].
- 4. Select the antenna connected to the TV.
- 5. You can check the signal strength and quality for a specific channel.
Frequently Asked Questions (FAQ)
- Q. Could the screen flickering be due to an internet issue?
- A. If you are watching an antenna broadcast, the internet connection is not related. For IPTV viewing, check your internet connection.
- Q. What should I do if the problem continues after checking the signal strength?
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A. If the signal strength is 50% or both signal strength and quality are below 70%, the broadcasting signal is considered very weak.
Please contact your building’s maintenance office or your service provider for support.
This guide was created for all models, so the images or content may be different from your product.
