Audio that drifts out of step with the picture is one of the most irritating Fire TV problems, and it is usually not a fault with your television or your soundbar. Amazon ships a tuning tool inside Fire TV that lines the two up again, and it takes seconds once you know where it lives. Here is the path and the reasoning behind each step.

The AV Sync Slider

Open Settings from the Fire TV menu, choose Display & Sounds, then Audio, and finally AV Sync Tuning. You will see an on-screen ball that bounces while a tone plays and the screen flashes. Your job is to make all three land at the same moment. If the tone arrives before the flash, nudge to the right. If the tone arrives after the flash, nudge to the left. Press Select or OK to apply, then watch the ball again and repeat until everything lines up.

One caveat worth knowing up front: the AV Sync Slider is not available on every Fire TV smart TV. If you cannot find AV Sync Tuning in the menu, your model does not offer it, and the lip sync route below is the one to use.

When you are using Echo speakers or a home theater group

If your audio is coming out of Echo speakers rather than the TV itself, the AV Sync Slider is not the right tool. Amazon uses a separate control called Lip Sync Tuning for home theater setups. Turn on the Fire TV, open Settings from the home screen, select Display & Sounds, then Home Theater Settings, and choose Lip Sync Tuning. Follow the on-screen instructions to synchronise audio and video, then confirm the result by watching a scene with clear dialogue.

The reason these are two separate controls is that the delay comes from different places. With a soundbar or TV speakers, the picture processing is usually the slower element. With a wireless speaker group, the audio transmission adds its own delay, so it needs its own adjustment.

Bluetooth audio and other sound sources

Bluetooth headphones and speakers introduce their own latency, which is why Fire TV includes a Bluetooth Audio Sync option under the same Display & Sounds menu. If the drift only appears when you are using Bluetooth, adjust that setting rather than the main AV sync control. Mixing the two up is a common reason people feel like the fix did not work.

What to check before you tune anything

Before you touch the sliders, rule out the simple causes. A paused and resumed stream can leave audio lagging, so stop playback and start the title again. If only one app shows the problem, the fault is more likely in that app than in your Fire TV settings. And if the delay appeared right after you added a new soundbar or speaker group, that new device is the most likely source of the change.

It also helps to test with a known good source. A news broadcast or a studio interview gives you clear faces and clear speech, which makes a small delay obvious. A fast action scene does not, and you will end up chasing a problem that is not there.

A sensible order of work

• Restart playback first, since a resume can fix a temporary drift.
• Confirm which device is producing the sound: TV, soundbar, Echo group or Bluetooth.
• Use AV Sync Tuning for TV and soundbar audio.
• Use Lip Sync Tuning for Echo home theater groups.
• Use Bluetooth Audio Sync for headphones and Bluetooth speakers.
• Re-test with dialogue-heavy content, not an action scene.

Working in that order means you only adjust the control that actually applies to your setup, and you avoid stacking corrections that fight each other. If the drift returns every time you switch apps, note which apps are affected. A pattern across all apps points at the device or the audio path, while a single app points at that app’s own playback settings.

For related Fire TV help, see our buffering troubleshooting checklist and the setup and update guide.