AnAV receiver or soundbar between a box and TV must support the chosen video format. A display can be 4K/HDR-capable while the intermediary limits resolution, refresh or dynamic range. Check the exact input and passthrough specifications. Check the receiver as an active part of the video route, even if its main purpose is audio. Its supported HDMI modes, port configuration and firmware can determine whether the television ever receives the desired resolution, refresh or HDR signal.
Read model details
Different HDMI inputs can have different capabilities. Read the exact model's input and output specifications rather than relying on its age, brand or audio badges. Different sockets can support different video modes, and a second monitor output may behave differently from the main one. Note the complete mode required by the source, including refresh and HDR type. A receiver passing ordinary SDR menus successfully has not yet demonstrated that it can pass the more demanding playback mode.
Check required modes
Some products need a documented enhanced-input setting. Consult the receiver manual for any documented enhanced signal, passthrough or standby settings affecting the selected input. Apply only the mode supported by both source and display, and record the previous value. An input setup change can alter negotiation and may require playback to restart. Check the matching TV input configuration too, since activating an enhanced mode at just one device does not guarantee that the entire connection route accepts the desired signal.
Compare direct video
A temporary direct connection can isolate the intermediary. Connect the source directly to the compatible TV input for a temporary comparison, using a suitable cable. If the intended video mode works directly, investigate the receiver route one link at a time. Consider the resulting audio arrangement separately; a TV return path may support a different set of audio formats. Do not assume that a video workaround automatically preserves every surround format that worked through the receiver's original direct input.
A practical sequence
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An example to work through
HDR works directly to the TV but not through an older receiver. Direct connection restores the intended HDR picture while the receiver route falls back to SDR. That narrows the video issue to the receiver path, but the viewer must separately check which audio formats the TV can return before keeping the revised wiring permanently.
Questions about this topic
Does receiver audio support prove video support?
No. Audio decoding and video passthrough are different capabilities with separate format requirements.
Can a premium cable add missing receiver capability?
No. A cable can carry a supported mode reliably but cannot add missing receiver processing or port features.
