Direct answer
Intermittent behavior is diagnosed by the trigger—movement, heat, load, sleep, distance or time—not by repeating broad resets. For HDMI eARC or ARC audio return, first test PCM/stereo first, confirm the labeled ARC port and bypass other HDMI devices.
What this covers
- HDMI eARC or ARC audio return with this exact failure state
- Diagnosis across TV speakers versus ARC/eARC sound system and one HDMI source
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleLog the trigger, duration, indicator state and whether physical movement or temperature changes it. Expected behavior: send TV and app sound to the selected sound system without renegotiation loops.
Isolate the component boundary
ReversibleTest PCM/stereo first, confirm the labeled ARC port and bypass other HDMI devices. Hold every variable constant except one cable, location, load or host at a time. Boundary to separate: TV speakers versus ARC/eARC sound system and one HDMI source.
Correct only the proven cause
ReversibleEnable matching CEC/eARC controls and retain the simplest stable format. Replace or reconfigure the one variable that reproduces the drop.
Verify and stop safely
ReversibleRun beyond the previous failure time and through sleep, movement or load once. Stop for electrical noise, heat, damaged HDMI sockets or repeated receiver protection.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when HDMI eARC or ARC audio return has this problem?+
Test PCM/stereo first, confirm the labeled ARC port and bypass other HDMI devices.
Why not factory-reset immediately?+
The useful boundary is TV speakers versus ARC/eARC sound system and one HDMI source. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
stop for electrical noise, heat, damaged HDMI sockets or repeated receiver protection.
Answer for the exact device and software version shown above.