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Hi Adam! Thanks for your question. A popping sound from external speakers when the TV is off usually happens when the connected audio device powers down at a different time than the TV, or from small electrical fluctuations in the audio connection. This is common with soundbars and receivers. This model also doesn’t include a setting to fully disable sleep mode, as it’s designed to enter sleep automatically to save power. If the popping continues, our support team at 877-467-4289 or [email protected], they can help with more troubleshooting. Poojitha | Insignia
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