After the power cord (mains lead) is plugged in, it takes time for the power to turn on or it doesn't turn on.

After the power cord (mains lead) is plugged in, in order for the system to initialize, the power buttons on the TV and on the remote control might be inoperable for a while, and the LED or Illumination LED might take time to light up.
This is not a malfunction of the TV or the remote control, so wait about 1 minute before operating.

NOTE: If the Operational Response or Illumination LED is set to Off, the LED or Illumination LED will not light up.
If your TV has an Operational Response or Illumination LED setting, follow the steps below to change this setting.

1. Open the  Settings screen.   How to access Settings: 
   • Using the Quick Settings button (For models released in 2019 or later)
     1. Press the  (Quick Settings) button on the remote control.
     2. Select  Settings.
   • Using the HOME button
     1. Press the HOME button on the remote control.
     2. Select  Settings.
2. The next steps will depend on your TV menu options:
   • Select System — LED indicator — Operational Response.
   • Select Device Preferences — LED indicator — Operational Response or Illumination LED.
   • Select Device Preferences — Illumination LED.
   • Select LED Indicator — Illumination LED.
   • Select Illumination LED.