Sound output port not working on the Mi Smart Projector.

Troubleshooting if the TV sound output port not working on the Mi Smart Projector, please refer to the following steps:
1. Make sure the audio cable is firmly connected to both the TV and the projector. Loose connections can cause sound problems;
2. Test another audio device with the projector to check if the issue is with the port or the TV's audio output;
3. Confirm that the TV's audio output is set to the right port. Some TVs have multiple options, so choose the correct one;
4. Try using a different audio cable to see if the problem is caused by a faulty cable;
5. Restart both the TV and the projector. Sometimes, a restart can fix temporary issues;
6. Check for any projector firmware updates. Updates may include fixes for audio problems. Install any available updates;
7. If the issue persists, consider resetting the projector to its default settings. Remember to back up important data before doing this;
8. If none of the above steps resolve the issue, contact your local after-sales for further assistance regarding this issue.