Short answer
First test the same scene through the TV speakers. If it is in sync there, check the soundbar, headphones and connection route. If it is already out of sync on the TV, compare another source or app. Adjust delay only after that, and note whether sound comes early or late.
Direction
Does sound come before or after the visible action?
Output
Does it also happen through the TV speakers?
Source
Does it affect one item, one app or every playback route?
The test clip is a guide, not a calibrated millisecond measurement.
Tell whether sound comes early or late
With clear speech, the lip movement does not match the words you hear. Choose a scene with distinct sounds or a visible clap; the mismatch is easier to notice than with music or scenery.
If the sound comes before the visible movement, it is early. If it comes after, it is late. This direction matters: an adjustment that delays audio may improve the first case and worsen the second.
Also note whether the offset is present from the start or appears after pausing, seeking or extended playback. A constant and a drifting offset may have different causes. Restart once and compare the same moment.
Cross-check with a simple sync clip
Our self-made audio-video test clip shows a bright field with a short sound at regular intervals. It contains no third-party film or music excerpts. Start at low volume.
Play it on the same device and, if possible, through the same audio route that has the problem. If your device opens it only in a different browser or player, record that difference. A synced browser test does not prove the original TV app is in sync.
The clip is a simple way to spot a noticeable offset, not a calibrated measuring device. Camera, screen and speakers affect perception. Use it alongside a familiar scene in the affected app, not to claim millisecond precision.
First isolate TV speakers from external audio
Temporarily switch to the TV’s internal speakers and replay the same scene. Do not also change picture mode, source and network.
| Observation | Next check |
|---|---|
| TV sound in sync, soundbar out of sync | Connection route, soundbar processing and documented audio settings |
| Only Bluetooth headphones are out of sync | Compare TV speakers or the intended wired route |
| TV speakers are also out of sync | Try another programme, then another app on the same device |
| Only one programme is affected | Record the source or channel and exact time |
| Offset grows after interruptions | Restart playback and check the network |
For the last case, use the buffering check. This comparison narrows the issue but does not prove a hardware fault.
Treat HDMI, optical and Bluetooth as different routes
Write down the full audio route, for example streaming device → TV by HDMI → soundbar by optical cable. A device connected directly to the soundbar differs from one routed through the TV.
Samsung explains audio delay and notes that the described control applies to the optical SPDIF connection. Do not apply that guide automatically to Bluetooth or every HDMI setup. Menus vary by model and version.
Check the manuals for your soundbar and TV for the exact connection. Find out whether a setting delays audio or changes other processing. Note the current value and test small changes one at a time. A menu that is not present is not user error.
Follow the right diagnostic path
If sound is early, first check whether a documented audio-delay control is intended for your connection. Increase it in small steps and replay the same scene each time. Restore the original value if there is no clear relationship.
If sound is late, adding more audio delay will not help. Compare direct TV audio with the external route instead. Check documented sound processing or another supported connection. Buy new cables or devices only when a clear comparison points to them.
If only one app is affected, note its version, source and the steps leading to the mismatch. Check for a current supported software version. A restart may clear a temporary issue; describe recurring faults as a short repeatable sequence for support.
What to record for a support request
A useful report includes TV model, streaming device, app version, soundbar or headphones, connection route, direction of the offset and the result through TV speakers. Add the channel or file and when it happens.
For TELOS, also identify the type of source access. Do not publish full playlist addresses or passwords. A short private clip showing the mismatch can help; respect rights to third-party content. The self-made test clip avoids third-party film and music excerpts.
A general live delay is different: picture and sound are both later than another reception route. The live-TV delay guide covers that issue.
Frequently asked questions
Should I increase audio delay when sound is late?
Not by default. Adding audio delay may make late sound worse. First identify the direction and check the documented control for your connection.
Why test the TV speakers first?
This separates the TV’s internal playback path from an added soundbar or headphone route. Use the same scene for both tests.
Does a synced test clip prove the TV app is fine?
No. If it plays through another player or audio route, it tests a different combination. Record the difference.
Is a late goal cheer automatically an audio sync problem?
No. If picture and sound are both late, the whole live stream is delayed; that is different from a sync mismatch.