TV Audio Out of Sync? How to Fix a Lip Sync Delay

When TV audio is out of sync, one side of the chain is taking longer than the other. Picture processing inside the TV can hold the image back, so the sound arrives early; a soundbar, receiver or Bluetooth link can hold the sound back, so it arrives late. The fix depends on which way round it is, so the first job is to work that out. Most cases are solved with the AV sync or audio delay setting, a less processed picture mode, or a wired connection in place of Bluetooth.

Step one: which side is late?

Find a scene with a close-up of someone talking, or a clip with clear hand claps or a ball being struck, and watch carefully.

• Lips move before you hear the words: audio is late. Look at the soundbar, receiver, Bluetooth or the audio format.
• Words arrive before the lips move: audio is early, which means the picture is late. Look at the TV's picture processing.
• The gap grows during a program and resets when you restart: the source device or app is drifting.

Next, narrow down where it happens. Switch the TV to its own speakers for a minute. If the problem disappears, the external audio device or its connection is responsible. Then try another app or input. If only one app or one box shows the delay, the fault lies with that source rather than the TV.

Common causes and fixes

Fixing late audio

1. Prefer HDMI or optical over Bluetooth. Wireless audio adds a buffer that some TVs compensate for and many do not. The guide on connecting a soundbar to a TV covers the wired options.
2. Change the digital audio format. Switching the TV's output from bitstream or auto to PCM moves decoding into the TV, which in some setups shortens the delay in the soundbar.
3. Reduce sound effects. Virtual surround, room correction and some dialogue modes take processing time. Turn them off to test.
4. Restart the audio chain. Power off the TV and soundbar, unplug both for a minute and start the soundbar first.
5. Update firmware on both the TV and the audio device. Sync bugs are a frequent subject of update notes.

Fixing early audio

1. Use the AV sync or audio delay setting. Found on most soundbars and receivers, and on many TVs under names such as lip sync, audio delay or digital output delay. It holds the sound back by a set amount; increase it in small steps until speech lines up.
2. Cut picture processing. Motion smoothing, noise reduction and similar features hold frames back while they work. Game mode switches most of them off at once and shrinks the delay.
3. Turn on automatic lip sync if offered. HDMI includes an optional feature that lets the TV report its picture delay to the audio device. It is built into eARC, and some ARC devices support it too. The explainer on ARC and eARC covers what each version includes.

One point catches many people out: delay settings can only hold sound back. They cannot make late audio arrive earlier. If sound is behind the picture and the AV sync slider is already at zero, the fix has to come from reducing audio processing or switching connection.

When the source is to blame

Streaming boxes, consoles and computers have their own audio settings. If only one device shows the problem:

• Set its audio output to automatic or stereo PCM as a test.
• Check for a frame rate matching option; switching it on or off can change how the TV processes that input.
• Restart the device completely rather than letting it resume from standby.
• For a laptop sending picture and sound over HDMI, confirm the TV is selected as the audio output. The guide to connecting a laptop to a TV shows where that setting sits.

Mistakes that make it worse

• Adjusting delay on the TV and the soundbar at the same time, so the two settings fight each other. Change one, test, then move to the other if needed.
• Judging sync on content that was badly encoded in the first place. Test on two or three different programs before changing anything.
• Leaving a large delay in place after fixing the real cause, which creates the opposite problem.

Can an HDMI cable cause lip sync problems?

Not in the usual sense. A faulty cable tends to cause dropouts, flicker or no signal rather than a steady delay.

Why is live TV in sync but streaming is not?

Each app handles audio and video in its own way, and some streams carry their own small offset. Restarting or updating the app is the first fix; if the delay persists, the problem may be with that stream rather than your equipment.

Is a small delay normal?

Every setup has some delay, but a well-adjusted one is too small to notice in normal viewing. If you notice it, it is worth fixing.