There are several circumstances that can cause the audio and video on your TV to be out of sync, including the following:
- When watching a TV program, it could be the broadcast itself or a bad connection between your cable/satellite set-top box.
- If a DVD or Blu-ray Disc™ player is connected to your TV, a poor connection or the disc itself could be the cause.
- If a home theater system is connected to your TV with an optical cable, there may be an audio delay that requires a manual adjustment on the home theater system. There also may be a setting on your TV that's causing the issue.
Check if the audio and video sync issue is resolved after completing each step. If model-specific information is needed to perform any action, check your product manuals for more details.
- Depending on the cause, this issue is often resolved by performing a power reset on your TV.
- Make sure your TV has the latest software update installed.
Downloads are posted on your model support page.
- Not all TVs have software that can be updated.
- If your TV is connected to the internet, you can download the software update through the TV menu.
- If you're watching a TV program, change the channel to see if the issue occurs on other channels.
- If it occurs on one channel only, the issue is with the broadcast. Contact your broadcast network provider for further assistance.
- Make sure that all cables are securely connected to your TV and your source device (set-top box, Blu-ray Disc player, home theater system, etc.)
- Play a different video source to determine if the issue occurs with other devices.
- On your TV, set the Game Mode setting accordingly. Not all TVs have this setting.
- Set the Game Mode to Off when watching TV or playing a DVD or Blu-ray Disc.
- Set the Game Mode to On when playing a video game.
- If a home theater system is connected to your TV with an optical cable, change the A/V Sync or Audio Delay setting on your home theater system (if available).
- Audio delay adjustments usually range from 0 milliseconds to approximately 250 milliseconds.
- Check your manual to see if A/V Sync or Audio Delay setting is available on your home theater system.
- For other manufacturers' home theater systems, check the instruction manual or contact the manufacturer for information on how to adjust the A/V sync setting.
- If you're using an Android TV or Google TV model and it's connected to the HDMI In (ARC) or HDMI IN (eArc/ARC) port on an audio system, such as a soundbar or home theater system, try changing the Digital audio out, A/V sync, Pass through mode, and eARC mode settings:
If the issue still occurs, repair may be required.  Go to Product Repair.