TV Audio Delay or Lip Sync? How to Fix Sound and Picture Out of Sync
First identify whether audio arrives before or after the picture, and whether the problem also occurs through the TV speakers. That narrows the source before you change sync settings.
First identify whether audio arrives before or after the picture, and whether the problem also occurs through the TV speakers. That narrows the source before you change sync settings.
Delay may come from a particular channel or file, television audio processing, a soundbar, Bluetooth, ARC/eARC or an external source. Isolate where it appears before changing settings.
Start by isolating the source
LG recommends checking whether the problem occurs on one channel or on everything. Test another app, channel and external source. If only one source is affected, troubleshoot that source first.
Is audio late or early?
If lips move before the voice, audio is late. If the voice arrives before the lip movement, audio is early or video is delayed. A delay control cannot be adjusted intelligently until you know which side is behind.
Test the TV speakers
Temporarily switch from the soundbar/home theater to the TV’s internal speakers. If synchronization becomes correct, the delay is likely in the external audio path or processing.
HDMI ARC/eARC soundbar
First confirm the correct ARC/eARC ports, then check A/V Sync or Audio Sync on the TV and soundbar. Sony explains that the right setting depends on the direction of the mismatch and the model. On some setups, turning A/V Sync off may help when sound is ahead of the picture. If sound is late, try a lower delay or a correctly supported Auto mode rather than adding delay blindly.
Could eARC be involved?
On some models, Sony includes temporarily disabling eARC as a diagnostic step. This is not a universal permanent recommendation: changing eARC can also change available audio formats, so use it to isolate the cause and then review compatibility, firmware and cables.
PCM vs Bitstream/Auto
Sony includes setting Digital Audio Out to PCM among troubleshooting steps for some sync problems. PCM can reduce or change processing latency, but it may also change the format delivered to the audio system. Treat it as a diagnostic test, not a universal best setting.
Optical connections
Optical does not guarantee perfect synchronization because the audio system can still add processing. Sony notes that some home-theatre systems provide manual Audio Delay or A/V Sync. If picture comes before sound, reduce audio-system delay when the setting allows it. If sound comes first, add an appropriate delay or try a different supported sync setting for the device.
Bluetooth
Wireless audio introduces additional transmission and codec processing. Samsung lists wireless transmission among possible causes of audio delay. If lip sync is correct over TV speakers or wired audio but wrong over Bluetooth, test HDMI or optical.
Gaming and Game Mode
Gaming is different because picture processing is deliberately reduced to lower input lag. Sony recommends using Game Mode for games and different settings for other content. If delay appears only on a console, inspect both Game Mode and the console audio format.
External boxes and players
Every extra processing stage can change timing. A source connected to the TV and then returned to a soundbar follows a different path from a source connected directly to the soundbar. Sony suggests direct soundbar connection in some cases, but only if the soundbar supports the required video format and passthrough features.
Update before rebuilding the setup
Samsung and Sony include firmware updates in audio-delay troubleshooting. Update the TV, soundbar and external source using official software, restart, then retest before replacing cables or factory-resetting.
Lip sync vs buffering
A stable, repeatable timing offset is different from buffering, where playback pauses, jumps or continually resynchronizes. If the problem changes with network instability, use Ghazaly Store’s buffering/network guide instead.
Five-minute diagnosis
- Test another source
- test TV speakers
- inspect A/V Sync
- try PCM temporarily
- replace Bluetooth with wired audio for comparison
- update firmware
- then test an alternate external-device path if the problem is source-specific.
When should you contact support or request service?
If delay affects every source, persists through the TV’s internal speakers and remains after firmware updates and a restart, contact the television manufacturer’s model-specific support. If it occurs only with one external audio device, check that device’s settings and support first rather than assuming the TV is faulty.
Conclusion
The fastest fix comes from finding where the delay begins. Isolate the source, TV and audio system; then adjust A/V Sync or the audio format with purpose. Use the soundbar and picture-settings guides if those issues remain. Check app compatibility in your device’s official store and contact support with the model and operating system if compatibility is unclear.
Frequently Asked Questions
Why is sound behind the picture?
Possible causes include TV or soundbar processing, wireless audio, an external source, sync settings or the content itself.
Should I increase Audio Delay?
Only if the adjustment moves the late side in the correct direction. Increasing delay when audio is already late can make the problem worse.
Is PCM always better than Bitstream?
No. PCM can help diagnose processing delay, but it may change the audio format delivered to the system.
Can Bluetooth cause lip-sync delay?
Yes, on some devices wireless transmission and codec processing can add latency.
Can eARC cause sync problems?
eARC itself is not inherently faulty, but it is part of the signal path and can be toggled as a diagnostic step on some models.
What if only one channel is out of sync?
Test other channels and sources; a single-channel issue can come from the broadcast/service provider.