Write the physical chain
Record the iPhone model, each adapter or hub, the HDMI or USB-C display cable and the television input. A chain with a charging port can have several different functions. Use the accessory manufacturer’s specification for the exact port rather than assuming all USB-C sockets carry identical signals.
An illustrative mistake is connecting a display to a port intended only to accept charging power. The shape fits, but the role differs. This example is a question to check in the accessory manual, not a conclusion about every hub that has a power-labelled socket.
Establish basic display output
Select the correct television source and use a non-private ordinary screen or photo first. If no interface appears, focus on the supported hardware combination and connection. Keep protected film playback for a later step so it does not obscure an earlier cable or input failure.
Use known supported accessories where available and change one component at a time. Note exactly what changed and whether a picture appeared. Replacing the cable, adapter and television input together can produce a working result while leaving the original cause unknown.
Move to the app only after the screen works
Once the basic output is visible, open the authorised video app and check its supported external-display behaviour. Apple’s adapter help notes content-protection requirements for some video. If the interface appears but that video does not, preserve the distinction rather than restarting the charging diagnosis.
A useful support report states whether charging works, whether basic external display works and whether the named programme works. Include the exact accessories and phone model, while hiding private notifications. Those three results answer different questions and prevent a working battery connection being mistaken for a complete media-output test.