A clean 4K image can hide a failed audio handshake.
The screen lights up, menus respond, and the receiver even shows the correct HDMI input—yet every speaker remains silent. This split failure is common because HDMI carries video and audio as related but separately negotiated streams. A source can establish a video link while its audio is being sent to the TV, muted by a format mismatch, or rejected somewhere in the return path.
The clue is often timing: sound disappears only after changing from a console to a streamer, or when launching a TV’s Netflix app. That points less to a blown speaker and more to HDMI control, EDID, eARC/ARC, or codec negotiation. Power-cycling everything may restore sound by forcing a fresh handshake, but it also erases the evidence. Before resetting, note the active input, receiver sound mode, source audio setting, and whether the receiver’s front panel reports PCM, Dolby, or no incoming signal at all.
- A receiver displaying “PCM” or “Dolby” confirms it is receiving audio; a blank or “No Signal” audio status narrows the fault upstream.
- TV internal apps use ARC/eARC rather than the receiver’s regular HDMI inputs, so their silence follows a different path.
Identify the exact HDMI audio path
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Name the program source
Record what is playing: a cable box, game console, disc player, streaming stick, or an app built into the TV. A TV app uses the return-audio path; an external player normally sends audio into the receiver first.
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Mark the active receiver input
Note the receiver input name and its physical HDMI jack, such as “BD” on HDMI IN 1. Confirm that this is the selected input, not merely the label shown on the front panel.
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Mark the display connection
Trace the receiver’s HDMI OUT cable to the TV’s HDMI input. For TV-app audio, identify the TV jack labeled ARC or eARC and the receiver’s HDMI OUT/ARC jack; these must be the same cable run.
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Write the intended listening zone
Establish whether sound should come from the receiver’s Main zone, Zone 2, or the TV speakers. Zone routing can leave video on the screen while the expected amplifier remains silent.
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Test one known route
Play a source with obvious sound and write the chain in order: console → receiver HDMI IN 2 → receiver HDMI OUT → TV HDMI 3, for example. This map prevents adjustments to ARC settings when the fault is actually on a source-input path.
Do not change HDMI-control, ARC, eARC, or audio-format settings until the active route is written down.
Isolate the source and receiver input
Start with one affected device—a cable box, disc player, game console, or streaming stick connected directly to the receiver. Leave TV apps and eARC/ARC out of this test. Confirm that the receiver is set to the expected input and that its display identifies the incoming HDMI signal.
Swap to a known-good receiver input
Move only the source’s HDMI cable to a receiver input that is known to play sound from another device. Select that input and retest, without changing the cable or source settings. This separates a bad input, incorrect input assignment, or zone-routing mistake from a source-side fault.
- Sound returns on the known-good input: the original receiver input, its HDMI assignment, or its selected listening zone needs correction.
- Picture remains but sound is absent on both inputs: investigate the source’s audio format and HDMI handshake.
- No picture after the move: suspect the cable, the newly chosen input, or an incomplete HDMI renegotiation; power-cycle the source and receiver before drawing conclusions.
Force a simple audio format
Temporarily set the source to PCM stereo (often labeled PCM, Stereo, or LPCM 2.0) rather than Auto, Bitstream, Dolby, DTS, or Atmos. Then start known stereo content and watch the receiver’s front-panel input indication.
If PCM stereo plays, the HDMI path is functional; the prior format was unsupported, blocked by a setting, or failing during negotiation. If PCM is still silent while video remains stable on a known-good receiver input, reset that source’s HDMI/audio output settings and test with a different source before treating the receiver as faulty.
Confirm the receiver can drive the speakers
Start at the front panel: Mute must be off, the Main Zone must be powered on, and volume should be raised to a safe, audible test level (for example, –35 dB). A receiver can show an incoming Dolby or PCM signal while its main amplifiers are inactive.
Headphones are a common diversion. On many models, inserting a plug silences the speaker outputs. Also check whether the input has been sent to Zone 2 rather than Main, and whether a party/zone mode has changed the active output.
Verify speaker and amplifier assignment
Open the speaker setup menu and confirm that the front speakers are enabled and assigned to the terminals actually in use. Height, bi-amp, or Zone 2 assignments can repurpose surround-back terminals, leaving a connected pair silent. Run the receiver’s internal test tone: if it reaches the speakers, HDMI decoding is no longer the likely fault.
Inspect each speaker cable for loose strands bridging the red and black terminals. A short, overloaded speaker, or blocked ventilation can trigger protection; the receiver may shut down, display a warning, or silently disable amplification. Disconnect speakers, power-cycle, then reconnect one known-good speaker at a time.
Finally, select Auto/Direct or a standard surround mode rather than an unusual listening preset. Some modes route only to selected channels; stereo content should produce sound from the configured front pair.
Test tone audible: investigate HDMI format, input settings, or listening mode.
Test tone silent: focus on zone status, amp assignment, speaker setup, wiring, and protection.
Restore audio from TV apps
Built-in streaming apps do not send sound through the receiver’s normal HDMI input path. They send it back from the TV through ARC or eARC, so a picture from an external source can work perfectly while Netflix, YouTube, or an antenna app remains silent.
Verify the return path
Both ends of the cable must use the ports labeled ARC or eARC—typically the TV’s single designated HDMI port and the receiver’s HDMI output/monitor port. On the TV, select External speakers, Receiver, or HDMI eARC rather than TV speakers. Then enable HDMI-CEC (often called Anynet+, Bravia Sync, Simplink, or HDMI Control) and ARC/eARC in both devices’ setup menus. A power reset after changing these options often forces a fresh handshake.
Match the TV’s digital output
Set the TV’s digital audio output to Pass Through or Auto first. If sound does not return, test PCM: reliable stereo PCM proves the return channel works but does not prove surround-format compatibility.
- ARC normally carries PCM stereo, Dolby Digital 5.1, and sometimes Dolby Digital Plus, depending on the TV and receiver.
- eARC has the bandwidth for lossless Dolby TrueHD and DTS-HD MA, plus higher-bandwidth Atmos formats, when the app, TV, receiver, and cable support them.
- If an older ARC receiver is silent on Auto/Pass Through, select Dolby Digital or PCM rather than a format it cannot decode.
Audio arriving late is usually a separate timing issue, not evidence of a failed return channel. Disable unnecessary TV processing, then use the receiver’s delay control; eARC lip-sync delay troubleshooting covers the settings that affect synchronization.
Silence Is Not Always a Decoder Failure
Stereo PCM is the first format to test. If it plays, the HDMI input, selected zone, volume path, and speaker outputs are fundamentally working.
Set the source or TV to PCM and force a two-channel track. The receiver should display PCM, 2.0, or Stereo. If this is audible, move on to compressed surround rather than replacing the receiver.
Dolby Digital bitstream is a useful second test, but Dolby TrueHD, DTS-HD, Atmos, and DTS:X require compatible devices and, for TV-app return audio, a functioning eARC path.
Play known Dolby Digital 5.1 content and inspect the receiver’s input and decoder screens. A Dolby Digital input with active Dolby decoding is expected. An “Unsupported,” PCM fallback, or silence points to a source-output setting, TV pass-through limit, or eARC mismatch.
Both can carry surround, but multichannel PCM is already decoded by the source and can fail when the TV, receiver, or HDMI link advertises only stereo PCM capability.
With a console or disc player, compare PCM 5.1/7.1 against bitstream. The receiver should report PCM with the correct channel count, such as 5.1. If it reports 2.0, the source has been restricted; if it reports 5.1 but remains silent, recheck amp assignment and speaker configuration.
Stop Dropouts After Startup or Input Changes
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Record the trigger and wait for negotiation
Note whether sound fails only after powering on, changing inputs, waking the TV, or returning from an app. After a switch, allow 10–20 seconds; some sources briefly send video before completing HDCP and audio capability exchange.
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Restart the HDMI chain in order
Turn off the source, receiver, and TV. Disconnect power for one minute, then start the TV, receiver, and source in that order. This clears stale EDID, ARC/eARC, and CEC state that a normal standby cycle may preserve.
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Disable HDMI Control for one test
Turn off CEC/HDMI Control on the TV, receiver, and source, then disable ARC/eARC if testing a connected source. Reliable sound with control disabled points to a wake-up, input-selection, or return-audio control conflict rather than a failed decoder.
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Replace the shortest link first
Use a certified short cable between source and receiver, then between receiver and TV. Marginal cables can pass a steady 4K picture yet fail when the receiver renegotiates audio after a mode or input change.
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Run a direct-to-TV bypass test
Connect the same source and cable directly to the TV and select the TV’s internal speakers. If dropouts remain, inspect source output settings, TV firmware, and the source-to-TV cable. If direct playback is stable but the receiver path fails, test another AVR input, update receiver firmware, and suspect the AVR HDMI board or its connected cable.
Re-enable CEC and eARC one at a time after stability returns; this identifies the setting that reintroduces the fault.
Prove the Repair Before Closing the Rack
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Confirm a stereo baseline
Play PCM stereo from the original source and verify sound from both front speakers at the normal receiver input.
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Recheck surround decoding
Send a known 5.1 or Atmos title and confirm the receiver display, active speakers, and listening mode match the program.
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Test TV-app return audio
Launch an internal TV app, then verify ARC/eARC audio returns through the labeled TV port without changing cables.
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Cycle inputs and standby
Switch among every regularly used input, place both TV and receiver in standby, then wake them twice. Audio should return without reseating HDMI.
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Record the working state
Note ports, cable type, TV audio setting, receiver input assignment, and firmware versions. If one physical HDMI port repeatedly fails with known-good cables and sources while others work, service is justified.
- A successful test includes wake-up behavior, not merely sound immediately after setup.
- A port-specific fault that survives controlled swaps is hardware evidence, not a settings guess.
The repair is complete only when stereo, multichannel playback, TV-app return audio, input switching, and repeated standby wake-up all work on the intended ports. Preserve the known-good settings; they turn the next failure into a quick comparison rather than a fresh diagnosis.