Well, I tried panel -> setup -> system -> components -> video. There I removed tv, video, sat etc, stored it and entered it again. I assume this is the right way? I can operate the tv, but the remote still reads "no contact." At first my audio equipment (in another room and one-way) didn't respond to the remote at all, but that works fine now after removing and entering the components again!
Could there be something wrong with the bl7000 (the 2way communication on the bl5000 works, so the tv is fine), or am I missing something? When I press 'source' tv, video, radio, cd etc. are listed, but when I press 'control' I only see radio, cd etc. or has this nothing to do with it?