Help Library: Help Library: [LG TV Screen] Does the screen flicker, accompanied by a scratchy sound?

[LG TV Screen] Does the screen flicker, accompanied by a scratchy sound?

Repair TVs 11/11/2024

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Causes and Symptoms

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

Try this

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

Unplugging the HDMI cable and reconnecting after 3 seconds

Does the screen flicker in all channels?

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

Running [Sound Test] in the Settings menu

WebOS 5.0

[2020 WebOS 5.0] Press the Setting

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.

Screen to enter all settings after pressing the setting button on the remote control

① Select [Customer Support] and then

② [Additional Settings].

Additional setting menu entry screen in customer support menu

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

Select video test in additional settings

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

Video test screen. [This image is a test screen. Please look carefully. Can you see the test screen well?] Message output example

[2019 or before] WebOS

[2019 WebOS or before] Press the Setting

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

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 [Channels] → ① [Channel Tuning → ② [Manual Tuning] → ③ [Cable DTV]. (Select when using a cable TV)

Manual channel setting and cable DTV selection

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.

Antenna connection status

※ 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.

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Help Library

[LG TV Screen] Does the screen flicker, accompanied by a scratchy sound?

Causes and Symptoms

Try this

Have you checked the HDMI cable?

Does the screen flicker in all channels?

Have you checked the antenna and cable TV connections?

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