Sony XAV-AX8500 Help Manual page 100

Help Guide
In-Car Receiver
XAV-AX8500
The connected HDMI device cannot be played.
Check the supported file formats for the connected HDMI device.
HDMI devices formatted with file systems other than 480p, 576p, or 720p are unsupported.
If [Video signal not detected] appears on the display, set the resolution of the HDMI device to match the resolution of
the unit.
Check that the HDMI cable is firmly inserted to the unit. It is also recommended to use a certified HDMI cable.
Disconnect the BLUETOOTH connection, Apple CarPlay, and Android Auto from your iPhone or Android phone that
uses an HDMI connection.
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