Smart TV technician helping fix audio delay and lip sync issues

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Smart TVs & soundbars, HDMI ARC/eARC, AV receivers, audio sync & lip sync, optical/Bluetooth audio, streaming apps (Netflix, YouTube, Prime)

Smart TV audio delay and lip sync issues — TV speakers, soundbar, receiver and Bluetooth

Technician avatar Technician
Hey! We’ll track down why your Smart TV audio is delayed and get the sound back in sync with the picture. A few details so we don’t guess or make it worse:
• Brand/model of the TV (Samsung, LG, Sony, Roku TV, Hisense, TCL, etc.)?
• Are you hearing the audio delay on TV speakers, a soundbar, AV receiver, or Bluetooth headphones?
• How is everything connected — HDMI ARC/eARC, optical (TOSLINK), Bluetooth, or an external box (cable box, Apple TV, Fire Stick, console)?
• Symptoms: is the voice behind the video, ahead of the video, only delayed in certain apps (Netflix/YouTube), or on every input?
The more detail we have, the easier it is to fix a Smart TV sound out of sync problem instead of just randomly changing audio settings.
Customer
I’ve got a Smart TV connected to a soundbar through HDMI ARC. Lately I noticed a lip sync problem — the voices are slightly behind the picture. It happens in Netflix, YouTube and even on regular TV channels. If I switch back to the TV speakers it’s better, but then the sound quality is bad. I’m not sure which audio delay or sync setting to change.
Technician avatar Technician
Got it — classic Smart TV audio delay with a soundbar over HDMI ARC.
A few things usually cause this:
• The TV is doing video processing (motion smoothing, upscaling, game mode) and the soundbar adds its own audio processing delay → lips don’t match.
• Audio is set to Bitstream / Dolby / DTS passthrough and the soundbar takes longer to decode than the TV expects.
• A hidden audio delay / AV sync slider in the TV or soundbar menu is set to the wrong value.
• In some brands, ARC/eARC and optical outputs use different default delays, so switching between them changes sync.

We’ll:
1) Make sure the TV and soundbar are using the right output format (often PCM is best for testing).
2) Adjust the audio delay / AV sync setting in small steps until speech matches lips.
3) Turn off extra processing that adds delay where possible so your Smart TV audio lag disappears on every app, not just one.
Customer
Right now my TV audio output is set to HDMI ARC with “Auto” and “Bitstream”. I don’t see an obvious “lip sync” option on the main screen, just “Digital audio out” and some sound modes. The delay is small but noticeable when people talk. Where should I start to fix the sound delay on my Smart TV?
Technician avatar Technician
Let’s stabilise the TV side first — that fixes most Smart TV sound out of sync complaints.
Step 1 — Switch to PCM and disable fancy sound modes
1) On the TV, go to Settings → Sound / Audio.
2) For “Digital audio out” or “HDMI ARC/eARC output format”, temporarily choose PCM instead of Bitstream/Dolby/DTS. PCM is simpler and often has less delay.
3) Turn off 3D sound effects, “Virtual Surround”, “Dialog Enhancer”, “Adaptive Sound” or similar processing that can add audio lag.

Step 2 — Reduce video processing that adds delay
1) In Picture settings, disable heavy motion smoothing (TruMotion, MotionFlow, Auto Motion Plus) and experiment with Game mode or low-latency picture modes.
2) Sometimes a “Standard” or “Game” picture mode keeps video delay lower and makes lip sync easier to match.

After this, check if the audio delay on your Smart TV is already reduced. If not, we’ll use the dedicated AV sync / audio delay controls.
Customer
I set the output to PCM and turned off the virtual surround mode. It’s a bit better, but I can still see that the voice is slightly behind the lips. Is there a more precise way to adjust the audio delay between the Smart TV and the soundbar?
Technician avatar Technician
Yes — most Smart TVs and soundbars have an AV sync or Audio delay setting, but it’s often buried in the menus.
Step 3 — Adjust AV sync on the TV
1) On many Samsung/LG/Sony TVs, go to Settings → Sound → Expert/Advanced settings and look for “Audio delay”, “Digital audio out delay”, “AV sync adjustment” or “Match screen and sound”.
2) If the voice is behind the video, reduce the delay (move the slider toward 0 ms or “Bypass” on LG).
3) If the voice is ahead of the video, increase the delay in small steps (10–20 ms at a time) until lips and voice match.

Step 4 — Check the soundbar’s audio delay
1) Many soundbars also have an “Audio sync” or “Lip sync” option in their menu or remote app.
2) Set the TV delay to 0 or Bypass first, then fine-tune on the soundbar so that all inputs (TV apps and HDMI devices) sound natural.
This two-step approach usually removes the Smart TV audio delay with HDMI ARC/eARC without affecting video quality.
Customer
Adjusting the TV’s AV sync helped, but I still notice audio lag when I use my game console and sometimes when I switch between apps. Is there anything specific I should do for HDMI devices and gaming to avoid sound delay?
Technician avatar Technician
Gaming is more sensitive to audio lag, so we’ll tighten things up for HDMI sources specifically.
Step 5 — Optimise HDMI inputs for low latency
• Plug the console or external box into the TV’s HDMI port that supports Game mode / low latency and, if needed, eARC.
• On the TV, enable Game mode or “Input lag reduction” for that HDMI input so video is not heavily delayed by processing.
• In the console’s audio settings, try PCM stereo or PCM 5.1 first. Bitstream formats can add decoding delay on some receivers.

Step 6 — Check ARC vs eARC / optical
• If you’re using an older soundbar without eARC, sometimes optical audio (TOSLINK) with PCM can have less delay than ARC bitstream.
• If you have eARC on both TV and soundbar/receiver, make sure eARC is enabled in the TV’s sound settings and CEC/ARC features are turned on.
After these tweaks, both movies and games should have much less noticeable Smart TV audio delay.
Customer
What about when I use Bluetooth headphones with the Smart TV? The Bluetooth audio delay is much worse than with the soundbar. Voices are clearly behind the picture when I watch Netflix at night.
Technician avatar Technician
Bluetooth always has some delay, but we can usually reduce it so the audio sync is acceptable.
Step 7 — Improve Bluetooth audio sync on Smart TV
• In the TV settings, look for a separate “AV sync” or “Audio delay” slider that applies when Bluetooth devices are connected (many LG/Samsung/Sony models have this).
• If your headphones and TV both support low-latency codecs (like aptX LL or LE Audio/Auracast), make sure they’re enabled; these can cut down Bluetooth audio lag noticeably.
• Keep the headphones close to the TV and avoid obstacles/other Bluetooth devices that can cause extra delay.

If Bluetooth still feels too delayed for lip sync, using a wired headset, RF headphones, or a low-latency Bluetooth transmitter connected directly to the TV’s audio out can be a more “instant” solution.
Customer
Are these changes safe to leave on permanently? I don’t want to have to redo audio settings every time someone watches a movie. I just want the Smart TV sound to stay in sync for normal streaming, live TV and gaming.
Technician avatar Technician
Yes, once we find a combination that fixes the audio delay on your Smart TV, you can leave it that way.
Preventive setup for long-term lip sync
• Choose one main connection path (e.g. TV apps → HDMI eARC → soundbar) and tune audio delay / AV sync for that path first.
• Leave the TV’s digital audio format on PCM or Auto unless you specifically need Dolby/DTS bitstream for a home theater system.
• Avoid frequently switching between TV speakers, ARC and Bluetooth for the same content if possible — each path can have different delay.
• Keep your TV firmware, soundbar/receiver firmware and streaming apps updated; many brands improve lip sync control in updates.
With this setup, your Smart TV should stay in sync day-to-day without constantly changing sliders.
Customer
What if after all this there’s still a small audio delay I can’t remove? Is there any quick test or trick you use to dial in the sync perfectly?
Technician avatar Technician
Great question — fine-tuning lip sync is mostly about testing the right way.
Step 8 — Use simple test content to dial in audio delay
• Open YouTube on the Smart TV and search for “audio sync test” or “lip sync test”. These clips flash a bar and play a click at the same time.
• While the test runs, slowly adjust the audio delay / AV sync value on the TV or soundbar until the click lines up with the flash.
• After that, play a familiar show or news clip — human speech is the best final check for Smart TV audio delay.

If you still can’t get it right, sometimes routing devices into an AV receiver first, then a TV in “bypass” mode, or using a dedicated HDMI audio delay box, gives you the precise control the TV’s built-in menus don’t have. We can design that setup with you in chat if needed.
Customer
After changing to PCM, turning off extra processing and adjusting the AV sync slider, my Smart TV audio delay is basically gone. Netflix, YouTube and my console all look and sound in sync through the soundbar now. Thanks for the detailed walkthrough!
Technician avatar Technician
Summary: when you have a Smart TV audio delay or lip sync issue, start by simplifying the audio path (PCM, no extra effects), then adjust the AV sync / audio delay controls on the TV and soundbar in small steps. Reduce heavy video processing, use Game/low-latency modes for HDMI devices, and fine-tune using an audio sync test clip. Bluetooth audio and complex receiver setups may need extra adjustment, but there’s almost always a combination that works. Not sure which setting on your specific TV to change? Open the chat and an expert will walk you through it step by step.

Quick answer: the accepted fix

Accepted fix when a Smart TV has audio delay: set the TV’s digital audio output to PCM, turn off virtual surround or heavy sound effects, then open the AV sync / audio delay setting for HDMI ARC/eARC or optical and adjust the slider until voices match lips. Use a simple video or audio sync test to fine-tune. For gaming and streaming, enable low-latency picture modes and keep the same connection path (TV apps → ARC/eARC → soundbar) so your Smart TV sound stays in sync.

Why Smart TV audio delay and lip sync issues happen

Most Smart TV audio delay problems come from a mix of video processing, audio processing and connection type. When your TV adds picture processing (motion smoothing, upscaling, noise reduction) and the soundbar or AV receiver does its own decoding, the sound can arrive later than the video. HDMI ARC or optical outputs may also apply a default delay to keep things in sync, but if that value doesn’t match your setup you get noticeable lip sync issues. Bluetooth adds another layer of latency, which is why Bluetooth audio lag is often worse than sound from a wired soundbar.

How to test if your Smart TV audio delay is really fixed

After adjusting settings, test with different types of content. Start with a lip sync test video or a YouTube clip that plays a click with each flash on screen and tweak the audio delay slider until they match. Then watch a show where people talk directly to camera and check that their lips line up with the words. Finally, try a game or sports stream where fast action makes sound out of sync easier to notice. If everything looks and sounds natural across TV apps, HDMI devices and your soundbar or speakers, your Smart TV audio sync is in good shape.

Smart TV audio delay — quick troubleshooting tips

Most issues are fixed by simplifying audio format, adjusting AV sync and reducing processing.

Quick path: set your Smart TV’s digital audio output to PCM, disable virtual surround and heavy sound modes, then use the built-in audio delay / AV sync setting to align sound with the picture. For HDMI ARC or eARC soundbars, test with TV apps, then with external devices like consoles and streaming boxes. If Bluetooth audio is still delayed, try low-latency codecs or a wired connection. A few careful changes usually solve Smart TV sound out of sync issues without buying new hardware.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your Smart TV model, soundbar or receiver, please consult a verified expert on Whizz-Tech before making decisions.

Understand what these prompts mean

Getting Started Is Easy

Ask for help, 24/7

Members enjoy round-the-clock access to 12,000+ verified Experts, including Smart TV and soundbar specialists, plus other techs, mechanics, vets, and more.

Expert will respond in minutes

We match you with an Expert who specialises in Smart TV audio delay, HDMI ARC/eARC and lip sync problems. Talk, text, or chat — whichever you prefer.

Save time & money

No scheduling hassles or expensive in-home TV visits. Fixing Smart TV sound out of sync issues online can save you time and money.

FAQ

Why is there audio delay on my Smart TV?

Smart TV audio delay usually comes from a mix of video processing on the TV and audio processing in a soundbar, receiver or Bluetooth device. When the TV delays the picture and the audio path adds extra decoding time, voices get out of sync. Switching to PCM, turning off heavy sound effects and adjusting the TV’s AV sync setting normally fixes it.

How do I fix Smart TV sound out of sync with HDMI ARC or eARC?

First, make sure your soundbar or receiver is on the TV’s HDMI ARC/eARC port and that CEC/ARC is enabled. Set digital audio output to PCM or Auto, then open the audio delay / AV sync menu and adjust the slider until speech matches lips. If possible, reduce motion processing or use Game/low-latency modes so video is not delayed more than the sound.

Can Bluetooth headphones cause extra audio lag on a Smart TV?

Yes. Bluetooth audio delay is often higher than wired connections, especially with basic SBC codecs. If your TV supports low-latency Bluetooth or LE Audio and your headphones match, enable those options. Otherwise, reduce Bluetooth distance, adjust the TV’s Bluetooth AV sync slider, or use wired or RF headphones for more instant sound.

Do I need a new TV or soundbar to get rid of audio delay?

Usually not. Most lip sync issues can be solved with settings: choosing PCM, turning off unnecessary processing and using audio delay controls in the TV or soundbar. Only in rare cases, where hardware has known sync bugs, would replacing a device be necessary.

Sources

Matt Verified Icon
Matt ● replies in < 1 min
Technician Expert
⭐⭐⭐⭐⭐ Trusted by 27,000+ customers
Avatar
Alex · Expert's Assistant
5 Tech Support Specialists are online right now.