Audio delay during screen mirroring is one of those problems that sounds minor until you are actually watching something. The words do not match the mouth movements, and suddenly every video feels like a badly dubbed foreign film. If you are mirroring your phone or laptop to your LG TV and the audio is out of sync, you are not alone, and there is usually a straightforward fix.
This guide walks you through the most reliable solutions, step by step. You do not need to be a tech expert to follow along. Work through each section in order, and you should have everything back in sync quickly.
Check your setup before adjusting any settings
Before you change anything on your TV or phone, it is worth ruling out the most common causes. A lot of audio sync problems come down to something simple in the setup rather than a deeper technical issue.
- Make sure your phone or laptop and your LG TV are connected to the same WiFi network. If one device is on a 2.4GHz band and the other is on 5GHz, this alone can cause sync problems.
- Check that your WiFi signal is strong. If your router is far away or blocked by walls, the stream can stutter and cause audio to drift.
- Close any apps running in the background on your phone or computer. These compete for processing power and can slow down the video feed.
- Restart both your TV and your device before trying anything else. This clears temporary glitches that cause sync issues.
Once you have gone through this checklist, try mirroring again. If the audio is still out of sync, move on to the next step.
Turn off audio processing on your LG TV
LG TVs have built-in audio processing features that are designed to improve sound quality. The problem is that these features add a small processing delay to the audio signal, which is enough to throw off the sync when you are mirroring a screen. Turning them off is often the single most effective fix.
- Press the Settings button on your LG remote.
- Go to Sound, then select Sound Mode Settings or Advanced Settings, depending on your TV model.
- Look for options labelled Auto Volume, DTS Virtual X, or Dolby Atmos and turn them off.
- While you are in the Sound menu, set the Sound Out option to TV Speaker if you are not using an external speaker or soundbar. External audio devices add their own processing delay.
After making these changes, go back to your mirroring session and check the sync. Many users find that disabling these audio enhancements resolves the delay completely.
Adjust the audio sync setting on your LG TV
LG TVs include a built-in audio sync adjustment tool that lets you manually shift the audio forward or backward to match the video. This is useful when the delay is small but still noticeable.
- Open Settings on your LG TV.
- Go to Sound, then scroll to find AV Sync Adjustment or Audio Sync.
- Enable the adjustment if it is toggled off.
- Use the slider to shift the audio. If the sound is behind the video, move the slider to reduce the delay. If the sound is ahead of the video, increase the value slightly.
Make small adjustments and test as you go. There is no universal correct value because it depends on your specific setup. A few small nudges in the right direction usually get you to a natural, matched sync.
Reduce WiFi interference to stabilize audio sync
Wireless interference is one of the less obvious causes of audio delay during LG screen mirroring. When your WiFi signal is unstable or congested, the video and audio data packets do not always arrive at the same time, which creates drift over the course of a session.
- Move your router closer to your TV and the device you are mirroring from, or reduce the number of walls and obstacles between them.
- Switch your device to the 5GHz WiFi band if your router supports it. The 5GHz band is faster and less congested than 2.4GHz, which helps keep the stream stable.
- Disconnect other devices from your WiFi network while mirroring. Smart home gadgets, streaming sticks, and other phones all compete for bandwidth.
- If possible, place your router in a more central location in your home to improve overall signal coverage.
A more stable WiFi connection keeps the audio and video stream consistent from start to finish. If you notice the delay getting worse over time during a session, WiFi interference is very likely the cause.
Still out of sync? Try these quick fixes
If you have worked through the steps above and the audio is still not quite right, a few additional fixes are worth trying before you give up.
- Restart the mirroring session. Stop the mirroring session, close the app, and start again from scratch. A fresh connection often clears a sync issue that built up during the previous session.
- Update your TV’s firmware. Go to Settings > Support > Software Update on your LG TV. Outdated firmware can cause compatibility issues that affect audio sync.
- Check your HDMI-CEC settings. If you use any HDMI-connected devices alongside screen mirroring, CEC (Consumer Electronics Control) can interfere with audio routing. Try disabling it under Settings > General > HDMI Settings.
- Try a different audio output. If you use a soundbar or external speaker, try switching back to the built-in TV speakers temporarily to see if the delay disappears. External audio hardware adds its own processing time.
Most audio sync problems during screen mirroring come down to one of the issues covered in this guide. Work through each fix methodically, and you will find the source.
How AirBeamTV Helps with LG Screen Mirroring
A lot of audio sync problems during LG screen mirroring come down to the quality of the mirroring connection itself. A weak or inconsistent connection forces your TV to buffer and compensate, which is where audio drift starts. We built our screen mirroring app specifically to avoid this.
Here is what using our app gives you:
- A stable, low-latency wireless connection that keeps audio and video in sync throughout your session.
- HD mirroring quality so you are not sacrificing picture quality to get a smoother stream.
- Direct LG TV compatibility with an app built specifically for LG models, rather than a generic solution that works around the TV’s native features.
- No extra hardware needed. No cables, no Apple TV, no adapters. Just download the app on your iOS device, open your device, and start mirroring.
If you are still running into sync issues or you want a more reliable mirroring experience on your LG TV, try our LG screen mirroring app and see the difference a purpose-built solution makes.
