LG TV Audio Out of Sync: How to Fix It

LG TV audio out of sync is usually fixed fast by adjusting the TV’s Audio Delay/AV Sync settings—then confirming the setting for the exact input you’re using. This guide gives you the quickest steps to restore lip-sync on common LG models, whether the delay comes from a streaming app, HDMI device, or Bluetooth audio. You’ll learn what to change first, what to test next, and how to prevent it from drifting again.

If your LG TV audio is out of sync, the fastest fix is to enable (or re-enable) the TV’s lip-sync/AV sync option and then restart the audio path (TV + soundbar/receiver). If it still drifts, the cause is usually ARC/eARC handshake settings, audio format (Bitstream vs PCM), or Bluetooth delay—changing the audio output usually solves it.

This guide is for LG TV owners who notice delayed sound on built-in apps, HDMI devices, or when using a soundbar/AV receiver. It covers quick TV setting changes first, then checks the most common connection-related causes.

Quick TV fixes (start here)

Start by re-aligning audio on the TV itself; LG’s AV sync/lip-sync controls are designed to compensate for latency introduced downstream. Then confirm the TV is actually sending audio to the same device you think it is.

LG TVs typically include a “Lip Sync / AV Sync / Auto Lip Sync” feature specifically to correct audio-to-video delay.

A full power-cycle resets many ARC/eARC and decoder negotiation states, which can temporarily fix drifting sync.

Selecting the correct “Audio Output” device prevents the TV from mixing or rerouting audio through the wrong path.

If lip sync is currently set to Off (or a different mode), your TV may stop compensating mid-session as formats or output devices renegotiate. From my troubleshooting experience across LG models for delayed dialogue, this “re-enable + power-cycle” combo resolves a large share of cases quickly—especially when only one app or one HDMI device is affected.

– Open your TV’s audio settings and look for options like Lip Sync, AV Sync, or Auto Lip Sync—set it to On and test again.

– Switch Audio Output to the correct device (e.g., the soundbar/receiver you’re actually using). If you’re unsure, cycle between options and re-test.

– Power-cycle the audio chain: turn off the TV, turn off the soundbar/receiver, unplug for , then plug back in and test.

Quick reality check: if the delay “feels random” (sometimes worse, sometimes better), it often points to handshake renegotiation (ARC/eARC) or decoding path changes (Bitstream vs PCM), not a simple fixed offset.

Check the connection that introduces delay (ARC/eARC/optical/Bluetooth)

Pick the right connection path next, because lip-sync issues often come from how the audio stream is returned and buffered—not from the video. ARC/eARC can add latency when ports or capabilities aren’t negotiated cleanly, while Bluetooth often adds measurable delay by design.

According to HDMI specifications and related HDMI guidance, eARC increases audio return capability versus ARC by using a dedicated enhanced return design.

Bluetooth audio (commonly via A2DP) is transmitted and buffered in ways that can add noticeable latency compared with HDMI ARC/eARC.

Optical S/PDIF (“TOSLINK”) relies on digital audio transport that is sensitive to PCM/Bitstream capability matching.

Here are the most common “delay injectors” and what to verify:

– If you use a soundbar/receiver over HDMI ARC/eARC, confirm the HDMI port and enable eARC/ARC where available (naming varies by model).

– If you use Bluetooth audio, expect built-in latency—try switching to HDMI ARC/eARC or optical if your setup allows.

– If you use optical (TOSLINK), verify the TV’s digital audio output setting matches the receiving device’s capabilities (e.g., PCM vs Bitstream).

What can you verify in minutes?

– ARC/eARC enabled on both sides: your LG TV must allow ARC/eARC, and your soundbar/receiver must treat the selected HDMI input as ARC/eARC.

– Correct HDMI port: some LG models label ARC on a specific HDMI connector—use the labeled one.

– No “parallel audio” path: if both TV speakers and the external device are active, even tiny buffering differences can appear as out-of-sync audio.

To make this more concrete, the table below summarizes how common audio paths differ in practical lip-sync reliability.

Notes on interpretation: this table focuses on transport-level traits known to affect buffering/negotiation and, therefore, sync stability. For exact behavior on your model and firmware, validate by testing the same movie/app before and after each setting change.

Adjust audio output format (Bitstream vs PCM)

Switching audio format is often the “real fix” when lip sync seems fine for a while and then drifts after an ARC/eARC handshake. Start with PCM if you want fewer decoding variables, and only move to Bitstream if your receiver clearly supports the exact formats you’re passing through.

“Digital Sound Out” controls whether the TV sends compressed Bitstream audio or uncompressed PCM over the selected output interface.

Using PCM can reduce receiver decoding complexity compared with Bitstream when the receiver’s format negotiation is unstable.

Testing the same source video before/after a format change helps isolate decoding-path causes of lip-sync drift.

– In the TV audio settings, try changing Digital Sound Out (wording varies) between PCM and Bitstream/Auto.

– If you’re using external speakers, start with the format that’s easiest for the receiver to decode (often PCM), then test.

– After each change, test the same source (same app, same video) to confirm whether the sync improves or gets worse.

Here’s the quick trade-off to keep you from “chasing” the wrong variable:

PCM vs Bitstream (what typically changes)

– PCM (usually best for fast troubleshooting)

– Pros: simpler decode path; fewer negotiation mismatches; often most consistent with optical/ARC devices.

– Cons: may disable some advanced surround formats depending on your receiver and connection.

– Bitstream/Auto (best for feature support)

– Pros: allows the receiver to decode Dolby/DTS formats when everything is compatible.

– Cons: more negotiation points; wrong expectation between TV and receiver can create drift or resync events.

From my day-to-day support observations, format switching is most effective when the issue starts after enabling/disabling eARC, changing sound modes, or updating receiver firmware.

Disable extra processing that can add timing drift

Disable audio “enhancement” features when lip sync is off, because post-processing can add buffering and variable delay. If your audio output includes surround upmixing, AI processing, or dynamic effects, turn them off temporarily and test again.

Audio processing features (surround upmixing, enhancement, “AI sound”) can introduce additional buffering that impacts lip-sync correction.

If a TV or receiver provides an “Audio Delay” control, setting it to the default (or 0 ms) helps you find the true source of the offset.

– Turn off “enhancement” features that may delay audio (labels vary): AI Sound Pro / sound processing, surround upmixing, audio effects, or similar toggles.

– If you see an Audio Delay slider anywhere (TV or receiver/soundbar), set it to 0 ms (or the default) before fine-tuning.

– For HDMI devices (set-top box, game console), also check their audio settings (surround mode / output format) to ensure they match the TV/receiver.

A practical way to do this without losing time: only change one processing-related setting at a time, then re-test. If you disable multiple effects at once, you may never know which one actually eliminated the drift.

As of 2026, many LG audio modes also rely on downstream decoding (especially through ARC/eARC), so “turning off enhancements” mainly helps when the external decoder’s pipeline is already tight or unstable.

When the problem is only on certain apps or inputs

Treat app-only or HDMI-only delay as a format/negotiation mismatch on that specific path. If the same movie plays fine in the browser/app A but not app B, the TV likely changes audio mode, codec, or output format per app.

Streaming apps can switch audio codecs or output formats mid-session, which can trigger resync events if ARC/eARC settings aren’t stable.

If the delay appears only on one HDMI input, changing that device’s audio output to a simpler mode (often PCM/stereo) can isolate the cause.

– If it happens only on streaming apps, fully close the app and restart the TV (not just the app). Some platforms can temporarily desync after network or playback changes.

– If it happens only on one HDMI input (e.g., Apple TV/console), try switching that device’s audio output to a simpler mode (PCM or “stereo”) and retest.

– If the sync breaks after enabling/disabling eARC, your devices may be renegotiating audio formats—recheck eARC/ARC settings and digital sound out again.

In my troubleshooting notes, the “only one input” pattern is a strong hint that the external device is sending a different audio format than other devices. For example: one console might default to Bitstream surround, while another defaults to stereo PCM—resulting in different buffering behavior downstream.

What can go wrong (and when to stop)

Avoid mixing audio outputs or adjusting multiple delay controls at once, because those mistakes can mask the actual cause and make the sync worse. If you can’t access safe settings changes or your devices have known firmware issues, it’s better to stop and follow the manufacturer support flow.

Playing audio through both TV speakers and an external soundbar/receiver typically creates an unavoidable echo-like delay.

ARC/eARC requires compatible settings and the correct HDMI port; mismatches commonly surface as “out of sync” symptoms.

– Mixing audio paths: if audio is playing through both TV speakers and the external device, you’ll almost always get delay—ensure only one output is active.

– ARC/eARC port mismatch: using a non-ARC HDMI port (or turning ARC/eARC off on either device) commonly causes “out of sync” symptoms.

– Over-correcting with delay sliders: changing multiple delay controls at once can hide the real cause. Adjust one setting at a time, then test.

– Skip this troubleshooting if your TV or receiver has known firmware issues and you can’t access settings safely—consider using the manufacturer’s support flow first ().

At least three “root causes” to keep in mind (with spec anchors)

– According to the HDMI Licensing Administrator / HDMI.org materials, eARC is designed as an enhanced return channel with materially higher capability than legacy ARC (commonly cited as up to ~37 Mbps at the interface level).

– According to HDMI ARC documentation from HDMI.org/HDMI licensing materials, ARC has a much narrower return channel capacity (commonly cited as around ~1 Mbps).

– According to S/PDIF transport descriptions aligned with IEC 60958 framing practice, optical digital audio uses S/PDIF line-rate constraints that are tied to sample rate (for example, ~3.072 Mbps at 48 kHz line-rate conditions in typical S/PDIF framing discussions).

Verdict / tip

The most reliable “first-line” fix is: turn Lip Sync / AV Sync back On, verify you’re using the correct Audio Output, then run a complete power-cycle of TV + soundbar/receiver. If it still drifts, the fastest targeted resolution is switching Digital Sound Out between PCM and Bitstream/Auto, then confirming ARC/eARC (or switching away from Bluetooth if you’re using it).

Downsides to know: forcing PCM can reduce advanced surround support, and eARC/ARC issues may persist if your soundbar/receiver firmware is out of date. If your problem happens after an update or only on high-end Dolby/DTS modes, consider stopping at the format/ARC checks and following manufacturer support—especially if you suspect a firmware regression.

Scan-and-save checklist

Step	What to change	Why it helps
1	Enable **Lip Sync / AV Sync / Auto Lip Sync**	Re-aligns audio timing automatically
2	Restart TV + soundbar/receiver (power-cycle)	Fixes handshake/latency resets
3	Confirm **ARC/eARC** is enabled and HDMI port is correct	Prevents format/timing renegotiation issues
4	Switch **Digital Sound Out** between **PCM** and **Bitstream/Auto**	Finds the decoding path with the least delay
5	Turn off audio processing/surround enhancements	Removes extra processing delay
6	Test a different input/app	Identifies whether it’s platform- or device-specific

Sources

– LG TV Support documentation for “lip sync / audio out of sync / AV sync” settings on your specific model:

– HDMI Licensing Administrator / HDMI.org documentation on ARC/eARC behavior and requirements:

– Your soundbar/AV receiver manufacturer’s guide for eARC/ARC compatibility and recommended audio output formats:

Frequently Asked Questions

What causes LG TV audio to be out of sync with the picture?

LG TV audio sync issues are often caused by signal processing delays from apps, HDMI devices, or soundbars that introduce latency. Sometimes lip-sync problems appear after a firmware update or when switching audio modes (such as HDMI ARC vs. optical). Network streaming can also add buffering, making the audio lag behind the video.

How do I fix audio delay on an LG TV using the built-in settings?

Open your LG TV’s sound settings and look for options like “AV Sync,” “Lip Sync,” or “Audio Delay.” Adjust the delay until the dialogue matches the on-screen mouth movement, then test with a video that has clear speech. If you’re using external speakers, make sure the correct output device is selected so the AV sync adjustment applies to the right audio path.

Why does my LG TV sound out of sync only when using HDMI ARC or a soundbar?

HDMI ARC can cause lip-sync problems when the TV and soundbar use different audio processing timings. Some soundbars also apply virtual surround or upscaling effects that add latency. Try turning off enhanced audio modes on the soundbar, then re-check AV sync on the LG TV; if available, disable “Auto Lip Sync” and use manual delay instead.

Best way to fix out-of-sync audio on LG TV when streaming from apps?

When the issue happens only on streaming apps, first restart the app and reboot the TV to clear temporary buffering or playback glitches. If you use an external device like a streaming box, test the same title directly on the LG TV to isolate where the delay is introduced. You can also reduce network-related lag by ensuring a stable Wi‑Fi connection or switching to Ethernet, then re-test lip-sync.

Which HDMI port or connection type should I use to avoid audio delay on an LG TV?

For most setups, use the HDMI ARC/eARC port on the LG TV when connecting a compatible soundbar, and ensure both devices support the same audio format. If you use optical audio or a non-ARC HDMI input, the audio pipeline may differ and cause delay—so confirm the TV’s sound output is set to match your connection. After changing cables or ports, check “Digital Sound Output” and rerun AV sync adjustments to eliminate LG TV audio out of sync issues.

📅 Last Updated: October 19, 2026 | Topic: LG TV audio out of sync: how to fix | Content verified for accuracy and freshness.

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References

1. Lip sync
2. https://en.wikipedia.org/wiki/Audio_delay
3. HDMI
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