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

Troubleshooting

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 Setting 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.
Screen to enter all settings after pressing the setting button on the remote control
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.
check cable DTV signal strength
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
connecting the rear antenna 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.

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