Lip-sync error can originate in one app, an HDMI device, Bluetooth, a soundbar or TV processing. Find the boundary before moving delay sliders. Compare a built-in app, the TV's speakers and the failing source with the same spoken scene. Bypass Bluetooth and use the TV speaker or a wired connection for a test.
Differential
Likely causes of “TV sound is behind or ahead of the picture”, and how to tell them apart
- 1
One app or one source has bad timing
What separates it Audio is off only in a single streaming app or a single HDMI device and other sources are in sync.
How to confirm Compare a built-in app, the TV's speakers and the failing source with the same spoken scene.
- 2
Bluetooth or wireless audio adds delay
What separates it The sound lags the picture with wireless headphones or a speaker and is fine on the TV's own speakers.
How to confirm Bypass Bluetooth and use the TV speaker or a wired connection for a test.
- 3
A soundbar or receiver adds processing time
What separates it The delay appears only when audio goes through the soundbar or receiver, and processing modes are on.
How to confirm Turn off extra audio processing or use a direct mode for one test.
- 4
The TV's own picture processing adds delay
What separates it Motion smoothing or other picture enhancement delays video, so sound appears early.
How to confirm Turn on the TV's game or low-latency picture mode for one test and compare.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which sources and apps are out of sync and which are correct.
- Whether the audio is early or late, and by roughly how much.
- The audio path: TV speakers, soundbar, receiver or Bluetooth.
Try in this order
0 of 4 completedCapture the exact symptom
ReversibleCompare TV speakers, the sound system and a built-in app using the same spoken scene.
Run the smallest isolation test
ReversibleBypass Bluetooth and connect the source directly; disable extra motion/audio processing for one test.
Correct only the proven cause
ReversibleApply delay only on the device common to every failing source, or update/reconnect the one failing app or HDMI device.
Verify before changing anything else
ReversibleConfirm live speech stays synchronized after channel changes and after restarting the devices.
Stop boundary
When this stops being a self-service repair
- !Apply an audio delay only on the device common to every failing source, and undo it if you later change the audio path.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Should I use the audio delay slider on the TV?+
Only after you find the source of the delay. A single slider hides the problem for one source and breaks the others.
Why is the sound out of sync with the picture?+
Processing delays in the TV, soundbar or streaming device can push audio and picture apart.
Can I adjust it?+
Use the audio delay or lip sync setting on the TV or soundbar.
Is it the source?+
Test another app to see whether it affects only one.
Does Bluetooth cause it?+
Yes, Bluetooth adds delay. Use a wired or low-latency connection.