If you were previously able to successfully use ARC (Audio Return Channel) between your TCL TV and Yamaha AVR and are now experiencing issues, there could be a few potential causes:
1. HDMI cable: Although you mentioned using a new, certified HDMI cable, it's worth double-checking its condition and making sure it's securely connected at both ends. Try using a different HDMI cable to see if it resolves the issue.
2. TV settings: Verify that the ARC function is enabled on your TCL TV. Check the TV's audio settings menu and ensure that ARC is turned on. Some TVs may have specific HDMI ports designated for ARC, so make sure the cable is connected to the correct port.
3. AVR settings: Confirm that the correct input on your Yamaha AVR is selected for ARC audio. Additionally, ensure that the ARC function is enabled in the AVR's settings menu.
4. Firmware updates: Check if there are any firmware updates available for both your TV and AVR. Sometimes updates can improve compatibility and resolve issues.
5. Power cycle: Try power cycling both your TV and AVR. Turn off both devices, unplug them from the power source, wait a few minutes, and then plug them back in and power them on again. This can sometimes reset any temporary communication issues.
If you have tried these steps and the issue persists, it's possible that there may be a compatibility issue between the eARC feature on your TCL TV and the ARC capability on your Yamaha AVR. In this case, you may need to consider alternative audio connection options, such as using an optical audio cable or HDMI with separate audio connections.