In order to troubleshoot the picture on your Smart TV shaking or shimmering, follow the steps below:

1. Check your TV's video connections and make sure they are securely connected.
2. Make sure any power strips are properly plugged in and functioning.
3. Verify that the cables between your device and your TV are properly connected.
4. Check any splitters and routers that may be present in the signal path.
5. Make sure your TV is not in the energy saving mode.
6. Check if the resolution and refresh rate in your TV settings is consistent with the recommended values.
7. Perform a Hard Reset of your TV.