SEO meta: Troubleshooting HDMI eARC dropouts and audio cutouts — the certified cable fix, settings checklist, and what actually causes eARC failures.
The symptom is maddening: audio drops for a second, comes back, drops again, and the receiver shows "no signal" in the middle of a movie. Your TV and AVR are both "eARC compatible." The internet says buy a new receiver. The actual fix costs twenty-five dollars and takes four minutes, because eARC failure is almost never the ports — it's the cable pretending to be something it isn't.
eARC carries uncompressed Dolby TrueHD and DTS-HD up to 37 Mbps over a single HDMI line, and it demands a certified Ultra High Speed cable — the ones rated for 48 Gbps with the certification label on the packaging. Any older "High Speed with Ethernet" cable will usually pass the picture but fail the audio handshake intermittently, which is exactly the drop-silence-drop pattern. The connector looking identical is the trap.
1. Swap in a certified 48 Gbps Ultra High Speed HDMI cable for the eARC run. This resolves the majority of dropouts on its own.
2. Update firmware on both the TV and the receiver — eARC handshake bugs were patched quietly on most major brands.
3. Enable eARC mode explicitly on both ends (TV sound setting: eARC/Pass-through; AVR: HDMI Control on).
4. If using an adapter or wall plate in the path, remove it — every joint is a handshake risk.
- Certified 48Gbps Ultra High Speed HDMI 2.1 cable: https://www.amazon.com/s?k=certified+ultra+high+speed+hdmi+2.1+48gbps+cable&tag=my-affiliate-Dev0ps-20
- Right-angle adapters that don't break the certification: https://www.amazon.com/s?k=right+angle+hdmi+2.1+48gbps+adapter&tag=my-affiliate-Dev0ps-20
If a certified cable and current firmware still drop audio, test the source directly into the TV's eARC port. Persistent failure across cables is a port-level fault — warranty it rather than buying your way up the replacement ladder.
Starting with the cable fixes it fast enough to finish the movie. That's the whole point.