Follow the steps below to troubleshoot the issue:

1. Check the power adapter: Make sure that the power plug has been securely connected to a working power outlet.
2. Check the remote: Remove the batteries from your remote and reinstall them to make sure they’re not causing the issue.
3. Check the TV's power button: Check the power button on the TV to make sure it hasn't become stuck in the on position.
4. Check the TV's energy saving features: Navigate to the TV's settings, and ensure that any energy saving features have not been activated.
5. Check for external signal interference: Ensure that your TV is not receiving a signal from another source.