Direct answer
For the Sony BRAVIA 8 OLED TV, correct labeled ports, matching CEC/eARC controls, output format and direct-chain testing matter. First, use the labeled ARC/eARC ports and test PCM/stereo.
What this covers
- Sony BRAVIA 8 OLED TV (K-55/65/77XR80)
- Sony BRAVIA TV; Google TV/Android TV version, XR processor, panel and HDMI 2.1 ports vary.
- The specific fault this record addresses: ARC or eARC soundbar audio is not working
What it does not cover
- ×The same symptom on a different Sony product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The cable is in the wrong HDMI port
What separates it No audio to the soundbar, with the cable in any port other than the one labelled ARC or eARC.
How to confirm Only one port on the television supports ARC/eARC and it is labelled. This is the most common cause by a wide margin and takes seconds to check.
- 2
HDMI-CEC is disabled on one of the devices
What separates it The soundbar does not power on with the TV, volume control does not pass through, and audio does not route.
How to confirm ARC depends on CEC, and every manufacturer gives it a different name — Anynet+, Bravia Sync, Simplink, VIERA Link. It has to be enabled on both devices.
- 3
The TV's audio output is not set to the ARC device
What separates it Sound continues from the TV speakers with the soundbar connected and powered.
How to confirm Set the audio output explicitly to the HDMI/ARC device rather than relying on automatic detection.
- 4
The cable cannot carry eARC bandwidth
What separates it ARC works but eARC does not, or high-bitrate formats such as Dolby TrueHD or DTS:X fail while compressed formats play.
How to confirm eARC needs substantially more bandwidth than ARC. A cable adequate for ARC can fail at eARC, and manufacturers generally specify a High Speed with Ethernet or Ultra High Speed cable.
- 5
The audio format exceeds what the soundbar supports
What separates it Silence on specific content only, typically Dolby Atmos or DTS:X.
How to confirm Set the TV's output to PCM as a test. If sound returns, the soundbar cannot decode what was being sent.
- 6
The CEC link has stalled
What separates it It worked before and stopped with nothing changed.
How to confirm Power everything off, unplug both devices for 60 seconds, then power the TV on first and the soundbar second. CEC links stall regularly and this clears most.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Which HDMI port the cable is in, and whether that port is the one labelled ARC or eARC.
- Whether HDMI-CEC is enabled on both devices, under whatever name each manufacturer uses.
- Whether the failure is total, or only on specific high-bitrate formats.
- The cable's rating, since eARC requires more bandwidth than ARC.
Confirm the cable is in the port labelled ARC or eARC
ReversibleOnly one port on the television supports it, and this is the single most common cause.
Enable HDMI-CEC on both devices
ReversibleEach manufacturer names it differently — Anynet+, Bravia Sync, Simplink, VIERA Link — and it must be on at both ends.
Set the TV's audio output explicitly to the HDMI/ARC device
ReversibleAutomatic detection frequently fails to switch over.
Set the output format to PCM as a test
ReversibleIf sound returns, the soundbar cannot decode the surround format that was being sent.
Power-cycle both devices with a 60-second unplug, TV powered on first
ReversibleA stalled CEC link is common and this clears most of them.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- K-55/65/77XR80. Sony BRAVIA TV; Google TV/Android TV version, XR processor, panel and HDMI 2.1 ports vary.
- Panel — WOLED
- 2024 OLED (LG Display WOLED panel), successor to the A80L, with the Cognitive Processor XR. Self-emissive, perfect blacks, no backlight — so a large bright window dimming slightly is the Auto Brightness Limiter, not backlight bloom.
- Smart platform
- Google TV. Update: Settings › System › About › System software update; screen share via Chromecast built-in and AirPlay 2.
- Dolby Vision — yes, including 4K 120 Hz
- Supports Dolby Vision (plus HDR10, HLG, IMAX Enhanced), and does Dolby Vision at 4K 120 Hz for gaming — unlike Samsung, which has no Dolby Vision at all.
- Gaming / HDMI — 2 ports, one shared with eARC
- Two HDMI 2.1 ports (HDMI 3 and 4, 4K 120 Hz, VRR, ALLM); HDMI 3 doubles as eARC. Put the console on HDMI 4 if a soundbar is on eARC. 'Perfect for PlayStation 5' features included.
- Panel
- An OLED panel, where each pixel emits its own light. Dark mode genuinely reduces consumption because black pixels are switched off, and a static bright element left on screen for very long periods is the one wear risk this panel type has that LCD does not.
- Symptom boundary
- This record covers Sony BRAVIA 8 OLED TV when it ARC or eARC soundbar audio is not working. A different symptom on the same hardware, or this symptom on a different Sony product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Do not use HDMI splitters or switches in an ARC path unless they explicitly support ARC/eARC — most break it entirely.
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.
Where the manufacturer's article stops. Sony Support publishes this as "Television and computer support". Official Sony and BRAVIA manuals, firmware and troubleshooting support. What that article does not carry is the model boundary — it is written for a product line, and K-55/65/77XR80 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
Can the Sony BRAVIA 8 do Dolby Vision gaming at 120Hz?+
Yes. The BRAVIA 8 supports Dolby Vision at 4K 120 Hz on its two HDMI 2.1 ports (HDMI 3 and 4), which is something Samsung TVs cannot do at all since they lack Dolby Vision. Put the console on HDMI 3 or 4, enable the source's Dolby Vision gaming output, and use a certified Ultra High Speed cable.
My soundbar gets no audio over ARC.+
Check which HDMI port the cable is in first. Only one port on the television supports ARC or eARC, and it is labelled — a cable in any other port gives exactly this symptom, and it is the most common cause by a wide margin. After that, make sure HDMI-CEC is enabled on both devices; every brand calls it something different.
ARC works but eARC doesn't.+
That is almost always the cable. eARC carries far more bandwidth than ARC to support uncompressed and object-based formats, so a cable that is perfectly adequate for ARC can fail at eARC. Manufacturers typically specify a High Speed with Ethernet or Ultra High Speed cable for it.
Does this answer apply to every Sony model?+
No. It is scoped to K-55/65/77XR80. Sony BRAVIA TV; Google TV/Android TV version, XR processor, panel and HDMI 2.1 ports vary.
What should I record before troubleshooting eARC or ARC or soundbar?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing eARC, ARC, soundbar. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for hot ports, electrical noise, sparks or receiver protection.
Answer for the exact device and software version shown above.