HDMI Resolution Reverts to Auto on Power Cycle

Hi All,

I've been setting up 3 Apple TVs where I need to set the resolution of the devices to 720p @ 50Hz. This works fine, until I power cycle the unit, at which point it reverts to Auto and due to EDID sets the resolution to 1080p which is giving me problems with the HDMI over Cat5 baluns I am using over long distance. This happens on all of the 3 units.

All 3 of the units are running the latest software, and I am not sure how to resolve this. Does anyone have any ideas? Sorry if this has been asked before, I had a search and couldn't find anything.

Thanks in advance.

Matt