My first guess would be that the "SD" (Secure Digital) card reader, USB, and "line-in" ports would output something to the video side of things, as well as audio. I don't see any kind of video screen on this unit, so you'll have to use the t.v. to navigate the menu/folders of your external device contents.
Here's the user's manual if that helps any - http://www.lci1.com/OwnersManuals/mi...ch%20Audio.pdf
See if you can translate the last line on page 10, the line that has the header "USB/SD/Band Pad". The way i read it is that you have to press the mode button until you're on DVD. Then be sure you don't have any DVD's in the unit....at that point, then you should be able to press the USB/SD/Band button which should allow you to select the usb or sd option to view or listen to whatever is on that type of memory (photos, music, video, etc).
To use the "line in", it looks like just pressing the 'mode' button a few times will toggle between dvd, aux in, radio, and weather band.
Hope that helps
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP