Start with the picture and sound you want to deliver. Then check every device and cable along the route. This approach helps you choose an appropriate connection and gives you a manageable way to diagnose a blank screen or missing audio.
Map the complete connection
Write down the source model, its output port, the television input, and any receiver, soundbar, switch, wall plate or adapter in between. Record the desired resolution, refresh rate and HDR mode separately. For audio, identify where you want the sound to play and which device decodes it.
A television can have different capabilities on different HDMI inputs. The manual may require an enhanced input setting for a particular signal. A receiver may pass some video modes while excluding others. Check the exact ports and supported combinations; the connector shape and a version label leave important questions unanswered.
| Your goal | Check along the path |
|---|---|
| An ordinary picture | Source output, selected TV input, supported resolution and refresh rate |
| HDR or high refresh rate | The exact video mode, color settings, port capability and any required input setting |
| Sound from TV apps through a soundbar | The TV and soundbar ports labeled ARC/eARC, their settings and supported audio formats |
| Sound from an external player | Source audio output, receiver/TV decoding and any pass-through restrictions |
| A camera or laptop connection | Output capability, correct connector size, adapter direction and supported signal mode |
An adapter has its own capabilities. When connecting a USB-C device, check that the device supports the required video output and that the adapter supports the intended mode. A plug that fits establishes only the physical connection.
Choose a cable by its verified capability
Use the official cable name and certification label when shopping. HDMI Licensing Administrator’s cable guide lists High Speed at up to 10.2 Gbps, Premium High Speed at up to 18 Gbps, Ultra High Speed at up to 48 Gbps, and Ultra96 at up to 96 Gbps. These are cable capabilities, not promises that a connected device supplies every signal mode.
Match the cable to the documented requirement for your setup. Look for the applicable authentication label, check the length you need, and follow the manufacturer’s direction markings on active cables. A working existing cable can remain in use when it reliably carries the intended signal. Higher cable capacity alone adds no new source or display features.
For example, “4K” is incomplete as a connection requirement. Refresh rate, color depth and chroma format also affect the signal. Check the equipment’s supported combination instead of choosing from resolution alone.
Find the failing part with one change at a time
- Record the failure: no picture, brief blackouts, picture without sound, or a missing selectable mode. Note which app, input and program trigger it.
- Check power, selected inputs, mute and the source’s output setting. Follow the equipment manuals when reseating connections or restarting devices.
- Where the manuals permit, test the source directly into the display using a short, known-working cable. This temporarily removes receivers, switches and wall connections from the test.
- Select a lower-bandwidth mode that both devices explicitly support. Restore the desired mode after the basic connection works. A successful reduced-mode test narrows the investigation; it does not identify the cable as the sole cause.
- Try a different supported input or cable, changing only one item. Add intermediate devices back one at a time and record when the fault returns.
- Check model-specific support information and firmware notes for the failing combination. Keep your working settings so you can return to them.
| Symptom | Useful next check |
|---|---|
| No picture and no audio | Confirm the input and test the simplest supported source-to-display route. |
| Desktop works, protected playback fails | Check the application and the complete HDCP-capable playback path with the manufacturers. |
| Intermittent dropouts | Compare a known-working short cable and reduced supported mode; include switches and wall runs in the investigation. |
| Picture works, audio is silent | Check the destination, mute and source audio format; test a mutually supported basic audio mode. |
| A desired mode is absent | Check the exact port, input setting, adapter and intermediate-device support. |
A test log is more useful than a sequence of unrecorded resets. Note the cable, input, output mode, result and date for each change. If a problem persists on one specific combination, send that record with the model numbers to support.
Separate forward audio from ARC and eARC
A source can send audio with video to a television or receiver. ARC and eARC provide a return route from the television to a compatible audio system, including sound originating in TV apps. HDMI’s eARC explanation describes the higher-capacity return channel. Actual format support still depends on the television, audio system, source and settings.
Use the designated ports on both devices. Follow their instructions for audio output and any required HDMI control settings. If a receiver or soundbar plays silence, begin with a format both ends support. Sony’s HDMI audio troubleshooting guidance includes checking mute, input selection and source output, with PCM or two-channel audio as a diagnostic option. Restore your intended surround format after resolving the issue.
For lip-sync problems, compare a TV app with an external source and note whether sound leads or follows the image. Review the documented audio-delay and picture-processing options for that route. An adjustment that helps one route may be unsuitable for another.
Keep a record of the working setup
Save the model numbers, port labels and settings that work. When adding equipment, compare its requirements with this record and repeat a short check with the actual content you use. For recorded home movies, the Digital Video library also covers tape, disc and file preservation.