Why Is My LG TV Screen Blue? What LG Says to Check

Last updated: October 2026

🕒 2 min read

Disclosure: This article does not contain affiliate or sponsored links. SignalVetted may still reference specific products or brands for informational purposes only.

Why is my LG TV screen blue? LG’s US support page lists what to check. This article follows only that page, “[LG TV] Troubleshooting Abnormal Picture Color: Screen Displayed in Blue or Red”. We haven’t tested any TV.

Why Is My LG TV Screen Blue? What LG Says First

If a TV only displays one color, such as red or blue, LG says the HDMI cable connection may need to be inspected. On certain channels or screens, LG says it’s likely a broadcast signal issue rather than the TV. If all screens look abnormal, LG says to run a Picture Test.

Why Is My LG TV Screen Blue? Causes LG Lists

LG lists four possible causes: an unstable signal from the set-top box or a connected device, a loose or damaged HDMI cable, an unstable antenna signal, or a malfunction in the TV itself.

Step 1: Run Screen Self-Diagnosis (Picture Test)

On TVs from 2024 onward (webOS24~), press Settings, then All settings → Support → Screen Self-Diagnosis. LG lists other paths for other model years. If the test image looks abnormal, LG says to note the TV model and contact LG Support.

Step 2: Check the HDMI Connection

If the test shows no issue, LG says the problem is likely not the TV itself. Turn off the TV and set-top box, then disconnect the HDMI cable from the back of the TV and reconnect it. LG recommends a genuine cable.

Quick Help HDMI Inspection

On models released after 2019, LG’s HDMI inspection checks the cable connection. On TVs from 2023 onward (webOS 23~), go to Settings → All Settings → Support → Quick Help → Self-diagnosis and Care → RF / HDMI. If it detects an issue, LG says to replace the cable with a genuine one; if not, to inspect the set-top box or other device.