TV Optical Audio Output Is Silent When Using a Dolby Digital Plus App

Built-in speakers play audio but optical receiver is silent for one app. A partial failure matters: one capability still functions, while a closely related step does not. This guide focuses on isolating that difference in audio devices, not on indiscriminate resets. Use the known-good behavior as your control, change one variable at a time, and retest the original scenario after each intervention.

Practical six-point diagnosis

1. Reproduce: Built-in speakers play audio but optical receiver is silent for one app.
2. Compare: Change audio format to PCM for a short comparison.
3. Check: Optical receiver does not support Dolby Digital Plus, without adjusting unrelated settings.
4. Check separately: TV output passes incompatible bitstream.
5. Correct: Set TV digital audio output to PCM or a compatible format.
6. Verify: Receiver plays supported digital audio consistently.

Baseline test: Change audio format to PCM for a short comparison. Record the current device model, OS or firmware version, and whether this occurs with one file, account, network or source. A reproducible contrast is more informative than a vague message such as “not working.” If the control fails too, stop treating this as a feature-specific problem and investigate the shared dependency first.

Possible explanations

Choose the appropriate route

Route A — Correct the observable mismatch

Set TV digital audio output to PCM or a compatible format. Start only after capturing the baseline. When the recommended control is not present on your model, look for its supported equivalent in the product documentation rather than following screenshots from another version.

Return immediately to the failing task and check whether the outcome changed. If it did, preserve the working setting and avoid piling on additional changes. If it did not, undo the change where appropriate before moving to deeper checks.

Route B — Test the underlying dependency

Compare broadcast PCM and app Dolby stream with receiver specification. This advanced comparison is worthwhile only if the simple check did not resolve the problem. The first two possibilities to separate are optical receiver does not support Dolby Digital Plus and TV output passes incompatible bitstream. Do not interpret their presence as proof of a diagnosis; a compatible device and a partially failed service may coexist.

Route C — Handle a limitation or persistent fault

A third explanation is app stream format changed. Check whether the feature requires particular hardware, account privileges, region settings or source formats. When a feature is unsupported, there may be no legitimate settings-only fix; use the vendor-documented alternative rather than an unsafe workaround.

Protect your setup: Never open optical laser port or modify protected stream. Start with modest volume. Confirm which device is both the actual audio source and output; a paired Bluetooth device may still use another output path.

Verify the result

Success looks like this: Receiver plays supported digital audio consistently. Run this check on the same device and account that originally failed. A different device passing is useful as a comparison, but it does not prove the original issue is fixed.

What to check if it still fails

Before contacting support, collect the exact model and version, the outcome of the baseline test, and whether the controlled correction changed anything. Keep passwords, private media, account identifiers, serial numbers and network keys out of screenshots or shared logs. Never open optical laser port or modify protected stream.

After the fix

Repeat the original action once under normal conditions and once after a routine reconnect or reopening, if relevant. Receiver plays supported digital audio consistently. Keep a brief note of the app, input, account or firmware state that changed so you can recognize a recurrence.