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If YouTube is not working on your Smart TV, start by checking your internet connection. Ensure your TV is connected to a stable network. Restart your TV and router. Update the YouTube app to the latest version and clear the app cache. If the issue persists, try reinstalling the YouTube app. For some models, you might need to activate YouTube using a code. Go to yt.be/activate on your computer or mobile device, enter the code displayed on your TV, and follow the prompts. If none of these steps work, consult your TV manufacturer’s support page for further assistance.