TV Lip-Sync Problem: Audio Delay Fix Guide

Table of Contents

• Why Is My TV Audio Out of Sync With the Picture?
• How Do You Use the AV Sync Setting on Your TV?
• What If the Sound Is Behind the Picture?
• How Do You Fix Lip Sync With a Soundbar?
• Does the Audio Output Format Affect Lip Sync?
• Can Bluetooth or a Bad HDMI Cable Cause Audio Delay?
• What If Only One App Is Out of Sync?
• Frequently Asked Questions
• Related Guides

To fix a TV lip-sync problem, play a dialogue-heavy scene and open your TV's AV Sync (audio delay) setting: if you hear voices before lips move, raise the delay in 10 ms steps until they match. If the sound lags behind, set delay to 0, switch digital audio output to PCM, and adjust sync on the soundbar instead.

Lip sync errors are measured in milliseconds, but once you notice mouths moving out of time with speech it is impossible to unsee. The good news is that almost every case is a settings issue, not a broken TV. Work through this guide in order: identify which direction the error runs, apply the matching fix, and fine-tune with the delay slider your TV or soundbar already has.

Why Is My TV Audio Out of Sync With the Picture?

Sound and picture travel through your system on different paths, and anything that processes one faster than the other creates a lip-sync error. The most common causes are:

• Video processing in the TV. Motion smoothing, noise reduction and upscaling all take time, so the picture arrives late and the sound appears early. This is why lip sync often changes when you switch picture modes.
• Audio decoding in a soundbar or AV receiver. When the TV passes Dolby formats to an external device, that device needs time to decode them, so the sound arrives late.
• Bluetooth audio. Wireless headphones and Bluetooth soundbars add their own transmission delay on top of everything else.
• App or source glitches. A single streaming app can drift out of sync while live TV stays perfect.
• Format and connection choices. Passthrough/bitstream output, older HDMI cables and ARC (rather than eARC) connections all change the timing.

Before changing anything, decide which way your error runs. Play a news channel or talk show with clear close-up dialogue. If you hear the word before the lips move, the audio is ahead — the easy case, fixed with the delay slider. If you see the lips move first, the audio is behind — read the dedicated section below, because the slider alone cannot cure it.

How Do You Use the AV Sync Setting on Your TV?

Nearly every modern TV has an audio delay control, though the name varies: AV Sync, Lip Sync, Audio Delay or Digital Output Audio Delay. On Samsung TVs it is under Settings → Sound → Expert Settings → Digital Output Audio Delay; LG places its AV Sync Adjustment under Sound → Advanced Settings; Sony, TCL, Hisense and Philips have equivalents in their sound menus. The procedure is the same everywhere:

1. Play content with clear, close-up speech — a news broadcast is ideal.
2. Open the AV Sync setting and start from 0 ms if you use TV speakers, or from a typical starting value below if you use external audio.
3. If the audio is ahead of the picture, increase the delay in 10 ms increments, testing after each change, until lips and words land together.
4. Write the final value down — TVs often store it per input, and you may need different values for different sources.

Typical starting points by setup:

• TV speakers only: 0 ms
• Soundbar via optical: about 30 ms
• Soundbar via HDMI ARC: about 50 ms
• Soundbar via eARC: about 40 ms
• AV receiver: about 100 ms
• Gaming with Game Mode on: about 20 ms

Most people land somewhere between 20 ms and 80 ms with a soundbar. Small steps matter: a 10 ms change is subtle, a 50 ms jump will overshoot.

What If the Sound Is Behind the Picture?

This direction is trickier, because every delay slider in existence can only delay audio further — none can advance it. If your sound already lags, do this instead:

1. Set the TV's audio delay to 0 ms. Any stored value makes the problem worse.
2. Reduce video processing. Turn off motion smoothing and picture enhancements, or enable Game Mode on that input — when the TV stops holding the picture back, the sound catches up.
3. Switch the digital audio output to PCM (next sections explain why this helps so often).
4. Move the correction to the external device. If a soundbar or receiver is decoding slowly, adjust sync there, and check whether it offers an automatic lip-sync option.
5. If you use eARC, try plain ARC. On some combinations, setting the TV's eARC mode to Off and falling back to ARC resolves stubborn sync errors with older soundbars.

How Do You Fix Lip Sync With a Soundbar?

Many soundbars have their own sync control, and it is often easier to reach than the TV's. Samsung's official support guidance is typical: press Sound Control on the soundbar remote, select SYNC, and adjust the audio delay between 0 and 300 milliseconds with the Up/Down buttons until the sound matches the picture. Some Samsung models instead have a dedicated Audio Sync button adjusted with the skip keys, or +/− buttons under an Audio Sync label. Philips soundbars use the same idea: press the Sound button repeatedly to cycle to Sync, then set Audio Delay between AV00 and AV200.

Two rules make soundbar sync painless. First, correct in one place only — set the TV's delay to 0 while you adjust the soundbar, otherwise the two corrections stack and you chase your tail. Second, if your streaming box or console has an HDMI input on the soundbar, plug it in there. When the soundbar receives picture and sound together and passes the video on to the TV, it can keep the two aligned far more reliably than when the TV splits them apart.

Does the Audio Output Format Affect Lip Sync?

Yes — it is one of the most overlooked causes. Your TV's Digital Audio Output setting decides who decodes the sound, and decoding takes time:

• PCM: the TV decodes everything itself and sends plain stereo. This gives the best, most reliable sync, at the cost of true surround formats. Always try PCM first when troubleshooting.
• Auto: the TV picks per content. Convenient, but the delay can change from app to app, which is why Auto is best avoided while you have sync problems.
• Bitstream / Passthrough: the raw Dolby or DTS stream goes to the soundbar or receiver to decode. This is what you need for Dolby Atmos, but the external decoding adds delay — compensate with that device's sync control.

A practical pattern: use PCM for everyday TV and basic soundbars; use passthrough for a receiver-based Atmos setup, with the receiver's lip-sync correction switched on.

Can Bluetooth or a Bad HDMI Cable Cause Audio Delay?

Bluetooth definitely can. Standard Bluetooth audio typically adds well over 100 ms of latency before any TV or soundbar processing, which is why dialogue looks noticeably wrong through many wireless headphones and Bluetooth-linked bars, even when everything else is set correctly. If sync matters, use a wired connection — optical or HDMI — or headphones using a low-latency codec and transmitter designed for TV use.

Cables matter too, especially with eARC. Use the port on the TV actually labelled ARC or eARC, seat the cable firmly at both ends, and if you suspect an old or damaged cable, test with a certified High Speed or Ultra High Speed replacement — eARC in particular needs a cable with the Ethernet channel to carry its full bandwidth. A cable swap is a five-minute test that rules out a surprisingly common cause of dropouts and timing problems.

What If Only One App Is Out of Sync?

When Netflix or YouTube drifts but live TV and other apps are fine, the system is healthy and the app is the problem:

1. Fully close and relaunch the app (not just back out of it), or restart it from the TV's app settings.
2. Restart the TV properly — unplug it for 60 seconds so the app cache genuinely clears.
3. Check for updates for the app and for the TV firmware under Settings → Support → Software Update, and update the soundbar's firmware too if one is offered.
4. Test another app or input. If everything else syncs, the issue is that app or that stream — reinstall the app if the problem follows it.

If sync is wrong on every source after all of the above, update the TV firmware, then — as a genuine last resort — factory reset the TV and set your noted delay values back up from scratch. Persistent errors on every source even after a reset are the one pattern that justifies calling a technician, as the fault may be in the TV's main board audio processing.

Frequently Asked Questions

What is a good AV sync value to start with?

Start at 0 ms for TV speakers, about 30–50 ms for a soundbar (50 ms on HDMI ARC, 30 ms on optical), and around 100 ms for an AV receiver. Then adjust in 10 ms steps while watching close-up dialogue until lips and speech match.

Why is Netflix out of sync but normal TV channels are fine?

Streaming apps decode and buffer audio and video separately, so a single app can drift while broadcasts stay locked. Relaunch the app, restart the TV from the wall, and check for app and firmware updates. If only one title is affected, it is usually that stream, not your setup.

Does eARC fix lip sync automatically?

Largely, yes. Unlike original ARC, the eARC specification includes a mandatory lip-sync correction feature that lets the TV and soundbar exchange timing information and align automatically. It is not perfect on every combination — which is why the manual slider still exists — but upgrading an ARC link to eARC (with a suitable cable) removes many persistent errors.

Why did lip sync get worse after I added a soundbar?

Because the soundbar adds a decoding stage the TV speakers never had. The TV sends the audio out, the bar processes it, and that processing time is your new delay. Fix it with the soundbar's own SYNC control or the TV's delay slider, starting around 50 ms.

Can lip sync be fixed permanently, or will I keep adjusting it?

Once set correctly, it stays fixed for that source — but different sources genuinely need different values, because a console in Game Mode processes video faster than a Blu-ray player in Cinema mode. Most TVs store the delay per input, so set each source once and note the values.

Does Game Mode help or hurt lip sync?

Both. Game Mode strips video processing, so the picture arrives sooner, which can push previously fine audio into sounding late. That is why the recommended delay for gaming (around 20 ms) is much lower than for movie inputs. Set game inputs separately.

Related Guides

• How to Connect a Soundbar to TV (HDMI ARC, Optical, Bluetooth)
• Soundbar Connected But No Sound? Fix Guide
• Best Soundbar Settings: PCM vs Bitstream vs Auto
• HDMI ARC vs Optical Audio: Which Is Better?
• TV Has No Sound? Fix for All Brands
• How to Connect Bluetooth Headphones to TV

About the Author — IW Official

A hands-on TV repair technician with years of experience fixing LED, LCD and Smart TVs. Runs a YouTube channel sharing practical, step-by-step TV repair videos, and writes in-depth troubleshooting guides so you can fix it yourself.