[LG TV] Troubleshooting Abnormal Picture Color: Screen Displayed in Blue or Red

If your TV only displays in a certain color, such as red or blue, the HDMI cable connection may need to be inspected.
If color distortion occurs on certain channels or screens, the issue is likely with the broadcast signal rather than the TV itself.
If all screens show abnormal colors, perform a Picture Test to check for issues with the TV.
During the Picture Test, if the test image also appears abnormal, please contact LG Support for further assistance.

Possible causes of TV color distortion

• The signal from the set-top box or connected external device is unstable.
• The HDMI cable is loosely connected to the TV or is damaged.
• The antenna broadcast signal sent to the TV is unstable.
• The TV itself is malfunctioning.

Perform [Screen Self-Diagnosis] to Check for TV Issues

Use the Screen Self-Diagnosis (Picture Test) function to check for TV issues.

Steps for Picture Test on TVs released from 2024 onward [webOS24~]

1. 1. Press the remote control Settings [] button, then select the All Settings [] icon on the top left of the screen.
2. 2. Select [Support], then [Screen Self-Diagnosis].
   
3. 3. Review the test image shown on screen.
   If the image displayed is abnormal, please note down your TV model and contact LG Support for assistance.
   

※ To check your TV model name, select [No] when prompted during Screen Self-Diagnosis.

If Screen Self-Diagnosis detects no issue, check the HDMI cable connection

If the Picture Test shows no issues, it is likely that the issue does not lie with the TV itself.
Inspect the HDMI cable that connects the set-top box or another external device to the TV.

Reconnect the set-top box HDMI cable

Turn off both the TV and set-top box. Disconnect the HDMI cable (or component) from the back of the TV and reconnect it.
It is recommended to use a genuine HDMI cable.

Inspect HDMI cable connection using Quick Help function

Go to [Quick Help] from the TV’s settings menu and select [HDMI inspection] to check the cable connection.
This function is available on models released after 2019.

• If the HDMI cable test detects an issue, please replace the cable with a genuine HDMI cable.
• If no issue is found, inspect the set-top box or other connected external device.

This guide was created for all models, so the images or content may be different from your product.