Help Library: Help Library: [LG TV] Troubleshooting Audio/Video Sync Issues

[LG TV] Troubleshooting Audio/Video Sync Issues

Troubleshooting LIFESTYLE SCREENS, Projectors, TVs 14/08/2025

<h2 class="tit">Let's find out more.</h2>
<p class="sub-tit">If the video and audio are not syncing on particular channels</p><p class="info-desc idt">
➔ If the video and audio do not sync only on a particular channel, it is highly likely that there is a problem with the broadcast signal of that channel.<br/>
Please contact your broadcast service provider first for assistance.
</p>

<h3 class="sub-tit">If the video and audio are not syncing on all channels</h3>
<p class="info-desc idt">
➔ Try using both the TV speaker and an additional external speaker. If the sound is out of sync, adjust the sync in [Match Screen and Sound].<br/>
Try delaying the TV's audio output to sync it with the external speaker.
</p>

<h2 class="tit">Try this</h2>
<p class="info-desc idt">➔ Setting in [2021 WebOS6.0] or later</p>

<div class="con-view">
Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=tHMcqjGVEOqfGqujQpczZA&amp;portalId=P1"/> button on the TV remote and select [All Settings] → [Sound] → [Advanced Settings] → [Match Screen and Sound].
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<p>※ This only applies to the TV speaker or devices that support the [Sound Share] feature and are connected to the HDMI (eARC/ARC) port of the TV.</p><br/>
<p class="txt-idt">
1. Turn on the TV and press the [Settings] button on your TV remote.<br/>
Select [All Settings] in the [Settings] menu.
</p>

<div class="img-only">
<img alt="Image that enters all settings by pressing the setting button on the remote control" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=6M5IEHomgr3vka3SwXg&amp;portalId=P1"/>
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<p class="txt-idt">
2. Select [Sound] → [Advanced Settings]→ [Match Screen and Sound].
</p>

<div class="img-only">
<img alt="Image to select match screen and sound" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=3L3EdRTuQDrUAuT0DeES4w&amp;portalId=P1"/>
</div>
<p class="txt-idt">
3. Select [Bypass] in [Match Screen and Sound].<br/>
The sound from the broadcast signal or external device will be output without delay.
</p>

<div class="img-only">
<img alt="Image of selecting bypass setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=MxpSPV3GduQoXwKQ37gjAw&amp;portalId=P1"/>
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<p class="txt-idt">
4. If the problem persists, turn off Bypass and select [TV Speaker Delay] to adjust the value carefully.<br/>
The closer the value is to 60, the slower the voice output gets.
</p>

<div class="img-only">
<img alt="Image of adjusting speaker delay" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=DFz3C59yPL7vVrvO99dUMQ&amp;portalId=P1"/>
</div><br/>
<p class="info-desc">➔ Setting in [2020 WebOS5.0] or before</p>

<div class="con-view">
Press the <img style="vertical-align: bottom;" alt="setting" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=PPnhbdFm6yc8Px63jhTQ&amp;portalId=P1"/> button on the TV remote and select [All Settings] → [Sound] → [Additional Settings] → [AV Sync Adjustment].
</div><br/>
<p class="txt-idt">
1. Turn on the TV and press the [Settings] button on your TV remote. Select [All Settings] in the [Settings] menu.
</p>

<div class="img-only">
<img alt="Image that enters all settings by pressing the setting button on the remote control" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=kv0WXX9MUShK9mQPeMPMg&amp;portalId=P1"/>
</div>
<p class="txt-idt">
2. Select [Sound] →[Additional Settings]→[AV Sync Adjustment].
</p>

<div class="img-only">
<img alt="Image to select AV Sync Adjustment" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=fp8yIXOlOjxDQ5E9sDO5fA&amp;portalId=P1"/>
</div>
<p class="txt-idt">
3. Select [Bypass] and set it to [ON], and then check if the audio and video are synced.
</p>

<div class="img-only">
<img alt="Image of selecting bypass" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=0F67Drt89JpMfxxDhsVWg&amp;portalId=P1"/>
</div>
<p class="txt-idt">
4. If they are still out of sync after [Bypass] is enabled, select [Bypass] and set it to [OFF], and then adjust the video and speech volume by selecting from 0 to 15 
</p>

<div class="img-only">
<img alt="Images that directly adjust the screen and sound sync" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=bPdFLh1HLC2joGJDyFoIGw&amp;portalId=P1"/>
</div>
<p class="help-txt">This guide was created for all models, so the images or content may be different from your product.</p>    </div>

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[LG TV] Troubleshooting Audio/Video Sync Issues

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If the video and audio are not syncing on all channels

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