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Sound Self-diagnosis is an automatic process that helps your LG TV fix any internal problems with your speakers.
This includes if your speakers are working properly and any audio issues.
How to locate Sound Self-diagnosis for audio
OLED Care
To locate "OLED Care", using your "magic remote control" click and select the "all settings" and proceed to "support".
Under "support", locate "OLED Care" which provides you with various premium services for OLED TV users.
Click on the "Device Self Care" which helps with any optimisations from picture, sound and energy saving functions.
Sound Self-diagnosis
Select the "Sound Self-diagnosis" from your "support" settings to check if your sound is working properly.
Follow the instructions and this function will check if your LG TV has any issues with your audio.