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Thank you for your inquiry! If you're experiencing audio sync issues on your 55-inch Insignia TV, upgrading to a high-quality HDMI cable, like the Insignia 6' DisplayPort to HDMI Cable, might help, especially if your current cable is outdated or damaged. However, it's not a guaranteed fix. Sync problems are often caused by software glitches, incorrect audio settings, or delays introduced by external devices. If you still experience delays on your tv, I recommend contacting Insignia Customer Service phone number (877-467-4289) for basic troubleshooting. Tine | Insignia Products
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