There are a few possible causes for picture flickering or pixelation on your Smart TV:

1. Check if your TV is connected to a strong enough source of power. If running on battery power, switch to a power outlet for improved performance.
2. Verify that the signal cable being used (HDMI, component, etc.) is properly connected and in working condition.
3. Check if the resolution of the TV is set to match the resolution of the source device (laptop, cable box, game console, etc.). Adjusting to lower resolution can often resolve image flickering or pixelation.
4. Restart both your TV and the source device. This can help refresh the connection between them.
5. Update both your TV and the source device with the latest software available. This may improve compatibility and performance.