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AV Sync Off

LG Soundbar

Severity: Minor

Source: OnlyErrorCodes.com — Every error code. One place.

LG Soundbar AV Sync Out of Sync — Audio Delay Fix

What Does This Error Mean?

LG soundbar AV sync issues happen because audio processing on the soundbar takes a few milliseconds longer than the TV's video.
Use the AV Sync setting on the LG remote or in the LG Sound Bar app to add audio delay.
Start at 50ms, adjust up if voices arrive before lips move, or down if voices lag.
Most users land at 30-90ms depending on their TV's video processing.

Affected Models

  • LG SP9YA
  • LG S95QR
  • LG SC9S
  • LG SP11RA
  • LG SN10YG

Common Causes

  • Soundbar processes audio slower than TV processes video
  • Game Mode on TV reduces video latency, exposes audio mismatch
  • Streaming source has its own latency
  • TV's HDMI ARC/eARC handshake adding delay
  • Soundbar firmware version with sync bug

How to Fix It

  1. Use AV Sync menu.

    LG remote → Settings (gear button) → AV Sync.
    Or LG Sound Bar app → your soundbar → AV Sync.
    Slide delay value up to delay audio (sound arrives later) — useful when audio is ahead of picture.
    Slide down (toward 0 or negative) when audio lags.

  2. Test with talking heads.

    Watch a news anchor or interview.
    Mouth movement and voice should match exactly.
    Adjust AV Sync until they line up.
    Static talking-heads scenes are easier to sync than fast-action movies.

  3. Disable TV's audio processing.

    Some TVs add their own audio delay even with passthrough.
    TV settings → Sound → Audio Delay → set to 0 or Auto.
    Let the soundbar handle delay only.

  4. Try Game Mode on the TV.

    Gaming mode reduces TV video processing delay, which can expose audio mismatch.
    If gaming, set TV to Game Mode AND increase soundbar AV Sync delay to compensate.
    Some users keep Game Mode on for everything to reduce latency.

  5. Update firmware.

    LG Sound Bar app → Settings → Firmware.
    Older firmware had AV sync calculation bugs.
    Apply latest stable; sync may improve.

  6. Try optical instead of HDMI.

    Some TV/soundbar combinations sync better over optical than HDMI ARC.
    Trade-off: optical can't carry Atmos.
    If sync is critical and you don't need Atmos, try optical.

Frequently Asked Questions

What's normal AV sync delay?

Most TV+soundbar setups need 30-90ms of audio delay.
0ms means soundbar matches TV exactly (rare).
Above 200ms suggests something deeper wrong — restart everything, check firmware.
Once dialed in for your room, the setting holds across content.