Casting has sound, but the TV picture is black

Step 1: Identify which picture is missing

Check that the TV is on the selected receiver or HDMI input. If even the television’s own menus or receiver screen are missing, start with the TV, receiver and cable setup. This guide concerns a working TV that loses the selected image or video picture.

In the player, confirm the filename and playback state. A file that has only been selected has not necessarily replaced the previous TV picture: press Cast for that selection. For a PDF, use the page controls; for an image, allow local still-image preparation to finish. Try a small JPG or PNG you own to compare the same display route.

Step 2: Separate decoding from the connection

An MP4, MOV or MKV extension identifies a container, not one guaranteed video codec. Sound can decode while the video track does not. Wait for automatic preparation and read any file-specific error. Try a short compatible H.264 video to distinguish one difficult source from a connection that fails for every file.

Use Settings → Quality → Original first, then compare 1080p if the device cannot keep up. This is a diagnostic comparison, not a guarantee that changing quality repairs a damaged or unsupported track. See the MKV guide and format reference rather than renaming the extension.

Step 3: Check the route your device actually uses

The website cannot confirm a TV selected in a phone’s system mirroring controls. Use device guides or the compatibility checker if the TV and source protocols do not match.

Protected streaming video is a separate case

A streaming service may restrict screen capture or AirPlay even when its own app plays normally. Apple notes that some video apps do not support AirPlay. Cast to Your TV handles selected local files; it does not remove DRM or unlock another service’s protected stream. Use that service’s supported TV playback route for its content.

If every file is black or playback keeps dropping

Compare the relevant computer, Android or iPhone instructions. Guest-network isolation and a VPN that blocks local traffic can disrupt connectivity. Different 2.4 GHz and 5 GHz bands are not automatically incompatible when the local network forwards traffic correctly.

If images work but video is soft or stalls, continue with quality and buffering. If nothing connects, use TV discovery checks. Keep the exact file type, source browser and TV model when describing the failure; that narrows the problem more than repeating the same reconnection.