Check the current time setting first. If the current time is not set or is incorrect, correct the settings as it affects the power on/off timer and other functions.
Try this
How to set up the [Power on/off] timer in Settings(2022 WebOS 22)
➔ Press the button on the TV remote and select [All Settings] → [General] → [System] → [Time & Timer] → [Timers]
Select [All Settings] in [Settings].
1. Select [System] in [General].
2. Select [Time & Timer].
3. Select [Timers].
Adjust the Time, Timer Repeat, Input, Timer Channel, or Volume settings.
Adjust the Time and Timer Repeat settings.
How to set up the [Power on/off] timer in Settings(2020 WebOS 5.0)
➔ Press the button on the TV remote and select [All Settings] → [General] → [Time] → [Timers]
Select [All Settings] in [Settings]
1. Select [Time] in [General].
2. Select [Timers].
This guide was created for all models, so the images or content may be different from your product.