Samsung QN90D Lip Sync Issue Fix for Gaming - Smart Home | digitalhomefaults.org

Technical Background:

The QN90D utilizes a high-speed processor to handle video and audio processing independently. The audio signal path involves decompression, digital signal processing (DSP), and output through the TV's internal speakers or an external audio system (e.g., soundbar via HDMI ARC/eARC or optical). Lip sync issues often stem from delays in either the video or audio processing pipeline. Gaming mode prioritizes video processing speed, which can sometimes lead to audio processing lag. Network connectivity (Wi-Fi 5GHz band or Ethernet) impacts firmware updates (OTA).

Symptoms:

Audio output from the Samsung QN90D is noticeably out of sync with the video display during gaming. The audio may lead or lag the video by a perceptible amount (estimated >50ms). No error codes are displayed on the TV's diagnostic menu or SmartThings app. Issue consistently occurs across multiple gaming consoles (e.g., PlayStation 5, Xbox Series X) and input HDMI ports.

Possible Causes:

Inadequate processing power allocation to audio when 'Game Mode' is enabled.
HDMI ARC/eARC synchronization issues with the external audio device.
Outdated TV firmware resulting in suboptimal audio-video synchronization algorithms.
Interference on the HDMI cable causing signal degradation.
Incorrect audio output settings on the gaming console (e.g., uncompressed audio formats).
Incompatibility between the TV's audio processing and the codec used by the game.

Solution:

1

Disable 'Game Mode' on the Samsung QN90D temporarily to check if it resolves the lip-sync issue. Note that this may increase input lag.
2

Navigate to Settings > Sound > Expert Settings > HDMI eARC Mode and ensure it is set to 'Auto'. If using optical, select PCM output on the TV and gaming console.
3

Update the Samsung QN90D to the latest firmware version via Settings > Support > Software Update > Update Now. Ensure the TV is connected to a stable internet connection (5 GHz Wi-Fi recommended or wired Ethernet).
4

Test different HDMI cables (certified HDMI 2.1) to rule out signal degradation issues. Ensure cables are securely connected.
5

Configure audio output settings on the gaming console. Try lower bitrate or compressed audio formats.
6

If using an external audio system (soundbar or receiver), ensure its firmware is also up to date. Try enabling or disabling the audio device's lip-sync correction feature.
7

Perform a factory reset on the TV (Settings > General > Reset > Factory Reset). Note: This will erase all user settings.

Safety Warning:

Do not attempt to disassemble the Samsung QN90D or any connected audio equipment. High voltage components are present inside. Ensure the TV and audio devices are disconnected from the power outlet before inspecting or replacing cables. Never expose the TV to excessive moisture or extreme temperatures. Protect SmartThings account with a strong, unique password. Review Samsung's privacy policy regarding data collection.

Prevention:

- Periodically check for and install firmware updates for the Samsung QN90D and connected audio devices. - Maintain a stable and high-speed internet connection for firmware updates (Bell Fibe Gigabit recommended). Consider assigning a static IP address to the TV to minimize network-related glitches. - Regularly clean HDMI ports and cables to prevent corrosion and ensure optimal signal transfer. - Before winter, ensure that there is adequate airflow around the back of the TV to prevent overheating if space heaters are used in the vicinity.

Expert Tip:

Press the 'Mute' button on the remote, then press 'Volume Up', then 'Channel Up', then 'Mute' again in quick succession to access the service menu. Use caution in this menu and only adjust the 'Audio Delay' setting incrementally. Document original values before making changes. Incorrect adjustments can lead to further issues.

Frequently Asked Questions

•Is the lip sync issue present with all input sources (e.g., streaming apps, cable TV)?

If the issue is isolated to gaming consoles, it points towards input lag or HDMI synchronization problems.

•What audio output device is being used (internal speakers, soundbar via HDMI ARC/eARC, optical)?

Knowing the audio output method helps narrow down the source of the delay.

•What is the firmware version currently installed on the Samsung QN90D?

Knowing the firmware version helps determine if an update is required to resolve the issue.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

Frequently Asked Questions

•Is the lip sync issue present with all input sources (e.g., streaming apps, cable TV)?

•What audio output device is being used (internal speakers, soundbar via HDMI ARC/eARC, optical)?

•What is the firmware version currently installed on the Samsung QN90D?

Related Questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: