On the main power board you can find a fuse but i don't think it's an internal fuse issue.
I think the problem is that the main power board has an issue.
Check three of the low voltage capacitors. They balloon at the top.
See a very good picture of the main power board here
[https://www.edaboard.com/showthread.php?361856-Blown-power-supply-for-home-Music-Streaming-device-(Zeppelin-Air)-Pictures-inside&highlight=zeppelin]