[LG TV Screen] The screen flickers with a scratchy noise.

Causes and Symptoms

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

Try this

Reconnecting the HDMI cable to the set-top box

➔ Try 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.
Also, remove and reconnect the HDMI cable from the set-top box, if feasible.
It is recommended to use an authentic HDMI cable to connect your TV to a set-top box. (Version 2.0)

Does the screen flicker in all channels?

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

Running [Picture Test] in the Settings menu [2019 or before]

[2019 WebOS or before] 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 ② Select [Picture] and then ② [Picture Test].

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

Running [Picture Test] in the Settings menu [Non-WebOS]

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

Turn on the TV and press the [Settings] button on your TV remote.
① Select [Picture] and then ② [Picture Test].

③ Select [Picture] and then [Picture Test].

If the test picture is displayed normally, it is likely that the broadcast signal has a problem.
If the problem does not occur in the picture 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.

Have you checked the antenna and cable TV connections?

➔ Here is how to check the signal strength in the TV menu.

How to check the signal strength in the TV menu

Press the button on the TV remote and select [All Settings] → [Channels] → [Channel Search] → [Manual Channel] → [Cable DTV].

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

Select ① [Channels], [Channel Search], ② [Manual Channel], and ③ [Cable DTV] in the specified order. (Select when using a cable TV)

④ You can see the signal strength and quality of the channel you are watching.

If there is a change of more than 30% in signal strength or signal quality, it means that the broadcast signal is unstable. In this case, contact your property management office or broadcast service provider.

Note

Please check if the antenna cable is properly connected to the back of the TV.

※ If the problem persists, please contact LG Electronics service technician for further troubleshooting support.

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