LG TV - Troubleshooting Poor HDMI Performance

If the screen doesn’t show specific colors or shows bleeding colors when connected to a set-top box, it may be due to a poor HDMI cable connection.
If colors bleed in only certain channels, it is likely an issue with the broadcast signal rather than the TV itself.

Causes and Symptoms

• The connection to your set-top box is bad.
• The broadcast signal is unstable.

Try this

The screen doesn’t show specific colors or shows bleeding colors?

➔ Try reconnecting the HDMI cable to the set-top box.

Reconnecting the HDMI cable to the set-top box

Turn off the power of the TV and the set-top box, disconnect the HDMI cable on the back of the TV, and reconnect it (HDMI, Component).
It is recommended to use an authentic HDMI cable to connect your TV to a set-top box.
Make sure that you use an HDMI cable version 2.0 or later.

Have you checked the HDMI cable using [Quick Help]?

➔ Try using [HDMI Check] in [Quick Help] in the TV Settings to diagnose the condition of the HDMI cable.

The [Quick Help] feature allows you to check if the HDMI cable is faulty or not. (Only applies to products released in 2019 and later)

Running [Quick Help] in the Settings menu

Press and hold the [9] button on the TV remote for more than 1 second and select → [Check TV Status] → [Check RF/HDMI] → [Health Check] → [Learn More]

① Check Items.

② Check TV Status.

③ Check RF/HDMI.

④ Health Check.
⑤ Learn More.

About HDMI cables (faulty cables)
If there are any abnormalities discovered from the test, replace the HDMI cable with a genuine cable.
If the picture problem does not occur in the test, please contact the set-top service provider. (e.g., cable TV, Skylife, IPTV)

Does the problem persist even after checking the cable?

➔ Go to [Settings] and start [Picture Test] to check if the picture works normally.

Running [Picture Test] in the Settings menu

webOS 5.0

[2020 WebOS 5.0] Press the button on the TV remote and select [All Settings] → [Customer Support] → [Additional Settings] → [Picture Test].

Turn on the TV and press the [Settings] button on your TV remote.
Select [All Settings] in the [Settings] menu.

① Select [Customer Support] and then ② [Additional Settings].

③ Select [Picture Test] in [Additional Settings].

Perform [Picture Test] to check the screen condition.

[Prior to 2019] WebOS

[2019 WebOS or before] Press the button on the TV remote and select [All Settings] → [Customer Support] → [Additional Settings] → [Picture Test].

Turn on the TV and press the [Settings] button on your TV remote.
Select [All Settings] in the [Settings] menu.

① Select [Picture] and then ② [Picture Test].

Perform [Picture Test] to check the screen condition.

If the image on the test screen appears okay, it indicates that the issue lies with the broadcast signal and not the TV itself.
If the picture problem does not occur in the test, please contact the set-top service provider. (e.g., cable TV, Skylife, IPTV)
If the problem persists in the picture test, please contact LG Electronics Service Center.

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