If your TCL TV suddenly stopped sending sound over eARC or ARC from built-in TV apps, you're not the only one dealing with this issue. HDMI-CEC, eARC, and app updates all interact in strange ways, so a small change in one place can mute the whole setup.
Quick answer
• Power cycle everything — Turn off TV and soundbar, unplug for 60 seconds, disconnect HDMI cable during power-off • Use the correct HDMI port — Connect to the ARC/eARC-labeled port on your TCL TV (usually only one specific port) • Reset HDMI-CEC handshake — Turn off CEC in both devices, then turn back on to force fresh connection • Check audio format settings — Switch TV audio output from PCM to "Auto" or Dolby Digital if you get silence
Symptoms
• Sound works from external devices but not built-in TV apps • TCL TV display shows "TV Audio" but produces no sound or intermittent audio • eARC connection drops out randomly during streaming • Apps play video but audio comes from TV speakers instead of soundbar
Quick checks
• Confirm HDMI connection — Ensure the cable plugs into the ARC or eARC-labeled HDMI port on your TCL TV • Test with a different cable — Old or damaged HDMI cables cause frequent eARC dropouts • Check TV audio settings — Select the option that sends audio to external receiver rather than TV speakers • Verify soundbar input — Make sure the soundbar is set to the correct HDMI ARC input, not another source • Disable Bluetooth audio — If TV is paired with Bluetooth headphones, it may route sound there instead
Step-by-step fix
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Power everything off completely Turn off both the TV and soundbar, then unplug them from power for 30-60 seconds to clear HDMI control state.
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Disconnect the HDMI cable Unplug the HDMI cable between the TV eARC/ARC port and soundbar during the power-off period. Wait a few seconds.
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Reconnect the cable firmly Plug the HDMI cable back into the eARC/ARC port on the TV and the ARC-enabled input on the soundbar. Avoid adapters for this test.
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Power on in correct order Turn on the TV first and let it boot to the home screen, then power on the soundbar. HDMI-CEC systems are picky about startup sequence.
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Reset HDMI-CEC settings On both TV and soundbar: Settings → HDMI → CEC Control → Off, wait 10 seconds, then turn back On.
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Configure audio output TV Settings → Audio → Digital Output → Set to "Auto" or "Dolby Digital" instead of "PCM" if experiencing silence.
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Test with built-in apps Open Netflix or YouTube and play a video. Watch the soundbar display for Dolby Digital, Dolby Atmos, or PCM indicators.
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Verify audio format matching If you get silence, try different audio format settings: Settings → Audio → eARC Mode → Toggle between available options.
If it still isn't working
Isolate the problem — Temporarily disconnect all other HDMI devices from both TV and soundbar, then repeat the power cycle. This strips the system to one connection for easier troubleshooting.
Check for firmware updates — Update both TV and soundbar firmware. If eARC works from external devices but not built-in apps, the TV firmware may be at fault.
Document the behavior — Note your exact TV model, which HDMI port you're using, what the soundbar display shows, and which apps fail. This helps support teams diagnose faster than vague "no sound" reports.
Consider professional help — If you still see HDMI issues with other sources, a warranty evaluation or professional installer may be needed.
FAQ
Why does eARC work with my streaming stick but not built-in apps? Built-in TV apps use different audio processing than external HDMI inputs. The TV firmware or app audio settings may need updates, or audio format compatibility differs between sources.
Should I use eARC or regular ARC? Use eARC if both devices support it for better audio quality and fewer dropouts. Regular ARC is fine for basic Dolby Digital, but eARC handles higher-quality formats like Dolby Atmos more reliably.
Why does the connection drop out randomly? Usually caused by HDMI-CEC conflicts, poor cable quality, or audio format mismatches. Try a certified Ultra High Speed HDMI cable and set audio output to "Auto" instead of forcing specific formats.
Can other connected devices interfere with eARC? Yes, game consoles and streaming devices can confuse HDMI-CEC and cause audio routing issues. Try disconnecting other HDMI devices temporarily to test if they're interfering.