When lip movement and voice do not align, the first reaction is often to adjust a delay control. This may help or make the wrong problem worse. First establish the direction: does sound arrive before the visible event or afterwards? Then check whether the issue affects one source, one connection path or all playback.
Choose a clear reference
Use a clearly visible speech passage or an appropriate synchronisation test from a reliable source. Not every film scene is suitable: editing, dubbing and deliberate creative choices may affect the impression. Check a second recording if uncertain before reconfiguring the entire system.
Record the signal route. A streaming app inside the television may follow a different path from a source passing through a receiver. If only one arrangement is affected, investigate there. Note whether headphones, a soundbar or television speakers are in use.
Do not compare several sources with different settings simultaneously. A small table listing source, picture path, sound path and observation is enough. It prevents a change for one input from later being mistaken for a universal fix.
Delay has a direction
If sound arrives early, an available audio-delay control may bring it closer to the later image. If sound is already late, adding audio delay moves it farther behind. Read the control's explanation in the manual. Some systems offer automatic synchronisation, whose behaviour also depends on the complete arrangement.
Where useful, compare or reduce picture processing and check whether timing changes. A more elaborate image function may follow a different processing path from a low-delay mode. This does not mean every picture function must always be disabled; it is initially a controlled comparison.
Sony's guidance describes model-dependent A/V Sync and Audio Delay controls and possible format comparisons. If testing PCM output, remember that channel or format transmission may change. A successful test answers a diagnostic question, not automatically which final audio configuration you want.
Check wireless output separately
Bluetooth may add delay to the audio path. Codec, devices and playback compensation interact. A Bluetooth version alone does not establish low latency. Where possible, compare a suitable wired path to isolate the wireless section.
If the equipment offers no appropriate correction, another connection route may be more useful than further menu experiments. Check supported formats and features first. Optical audio, for example, has different limitations from HDMI. Document the chosen arrangement and retest the main sources.
Use a small fault table
For each source, record three things: internal or external playback route, audio output used and direction of the timing error. An internal application may align through television speakers while the same service on a player produces late audio through a soundbar. This does not establish a fault in every involved device; it narrows down the affected route.
If audio is already late, adding audio delay makes the error worse. Instead, investigate the documented options along that route and any additional processing. If sound precedes the picture, a designated delay adjustment may help. Establish the direction before moving a control.
After each change, test the same passage and a second item. Save different values for different sources only if the equipment supports it and the difference occurs repeatedly. A one-off disturbance should not produce a permanent correction that subsequently shifts every other programme.