LG TV - How to Perform a Picture Test

Color bleeding may be observed in certain broadcasting channels due to poor reception of broadcast signals.
If you experience symptoms like color bleeding and color overlap, particularly on a specific channel,
it is advisable to contact your set-top service provider for further assistance with the signal check.

Causes and Symptoms

• The broadcast signal strength is weak.
• The HDMI cable connection between the TV and the set-top box may not be in good condition.
• Ultra Deep Color is disabled.

Try this

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

Running [Picture Test] in the Settings menu

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].

④ Perform [Picture Test] to check the screen condition.

[2019 or before] WebOS

Press the button on the TV remote and select [All Settings] → [Picture] → [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].

③ Perform [Picture Test] to check the screen condition.

If the problem persists in the picture test, please contact LG Electronics Service Center.

Are you connected to an set-top box?

➔ Open [Ultra Deep Color] in the TV Settings and check if it is set properly (On/Off).

When using a set-top box, an incorrect Ultra HD Deep Color setting can result in various symptoms, such as color bleeding and abnormal colors.

• If your set-top box (including the HDMI connector) supports a picture quality of 4K (3840*2160), set it On.
• If your set-top box supports the HD (1920*1080) or lower picture quality, set it Off.

Running [Ultra Deep Color] in Settings

Select [Settings] → [All Settings] → [Picture] → [Additional Settings] → [HDMI Ultra HD Deep Color] → [On] or [Off].

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 [Additional Settings].

③ Select [HDMI Ultra HD Deep Color] in [Additional Settings].

④ Set HDMI 1 (connected port) to On.

Have you checked the HDMI cable?

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

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