Sony Sony HT-S400 2.1-Channel Soundbar with Wireless Subwoofer NO SOUND ARC Error Fix: No Audio via HDMI ARC/eARC

Error code NO SOUND ARC on the Sony Sony HT-S400 2.1-Channel Soundbar with Wireless Subwoofer means: No Audio via HDMI ARC/eARC. The soundbar is connected to the TV via HDMI but no audio is playing through the soundbar. The TV continues to play sound through its own internal speakers. Confirm the HDMI cable is plugged into the port labeled ARC or eARC on both the TV and the soundbar — only specific HDMI ports support ARC, and using the wrong port is the single most common cause of this issue. On the TV, change the audio output setting to HDMI ARC or Audio System (on Sony TVs: Settings > Display & Sound > Audio Output). Enable CEC (called BRAVIA Sync on Sony TVs: Settings > Channels & Inputs > External Inputs > BRAVIA Sync Settings). On the soundbar, set the input to TV or HDMI by pressing the input button until the correct input is selected. Power cycle both devices — unplug both for 30 seconds, reconnect the soundbar first, then the TV. For eARC connections, you must use an Ultra High Speed HDMI cable rated for 48 Gbps. Try a different HDMI cable to rule out a damaged cable.

The most successful fix is "Replace HDMI Board or Repair Internal HDMI Connections" (medium difficulty, ~60 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace HDMI Board or Repair Internal HDMI Connections") is rated medium difficulty and takes about 60 minutes. Tools needed: T10 Torx screwdriver, Multimeter, Plastic pry tool.

DIY cost: $20-$40. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Sony Sony HT-S400 2.1-Channel Soundbar with Wireless Subwoofer has 8 other known error codes, including: AUDIO DELAY (Lip Sync / Audio-Video Delay), AUTO STANDBY (Unexpected Power Off / Auto Standby), BT PAIR FAIL (Bluetooth Pairing Failure), CEC CONFLICT (HDMI CEC / BRAVIA Sync Erratic Behavior), DISTORTED AUDIO (Crackling, Popping, or Distorted Sound), and 3 more.

Error code NO SOUND ARC also appears on 2 other Sony models: Sony HT-A5000 5.1.2-Channel Soundbar with Dolby Atmos and DTS:X, Sony HT-A7000 7.1.2-Channel Soundbar with Dolby Atmos and DTS:X. The fix may vary by model, so check each model's specific page for tailored repair steps.