If your BV7 is a mrk 2, if you live in EU it is... then use AV 4's two RCA phonon plugs, call AV 4 - V.AUX in the TV menu.
Then ADD. A-V.AUX to your remote (Press list and st.by at the same time to enter service menu on beo4. then "ADD?" is shown in the display press GO, and scroll to you find it) you also need to set the TV to "option 2" thats also done in the service menu on the remote you have to find "option" instead of ADD? by pressing "list", and then V.opt and then press "2", TV has to be in standby.
If you do it this way the screen is turned of when you use the Ipod
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hope this can help you