Speakers & soundbars

Over-the-air TV broadcast has audio out of sync with video

This is typically a broadcast-side encoding issue or a TV processing delay, not something wrong with your equipment specifically. Restarting the TV and checking other channels usually clarifies the cause.

Difficulty
Easy
Time
10–20 minutes

Symptoms

  • Only one specific channel has sync issues
  • All channels through the antenna have delay
  • Streaming apps on the same TV are perfectly synced
  • Sync issue appears and disappears at different times of day

Likely causes

  • CommonBroadcast station's own encoding/transmission errorLocal stations occasionally have their own sync issues that affect all viewers, not just yours.
  • CommonTV's internal video processing adding delayPicture enhancement features can slow video enough to fall out of sync with broadcast audio.
  • PossibleWeak antenna signal causing the TV to buffer/correct errors, introducing delayA marginal signal can cause the TV's digital processing to compensate in ways that affect timing.
  • PossibleOutdated TV firmwareSoftware bugs affecting tuner processing can cause intermittent sync issues.
  • Less commonFaulty tuner in the TVAn aging internal tuner can introduce processing delays specific to broadcast reception.

What to do

  1. Check if the sync issue is present on other channels; if it's just one channel, it's very likely a broadcast-side issue you can't fix.
  2. Turn off picture enhancement features like motion smoothing in the TV's picture settings.
  3. Rescan for channels through the TV's antenna setup menu to refresh signal data.
  4. Check antenna positioning and connections to improve signal strength, since weak signal can cause processing delays.
  5. Update the TV's firmware to the latest version.
  6. Restart the TV completely by unplugging it for a minute.
  7. If sync is fine on streaming apps but consistently off on broadcast TV across all channels, this points to the TV's tuner specifically.

When to call a pro

If sync issues are isolated to broadcast TV across all channels and persist after updates, a technician can check the TV's tuner, though this is often not repairable and may point to needing a different antenna setup or TV.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.