interesting pic from a book called Tupolev TU-134.
notice the huge box size TV's hanging from the ceiling. This was first introduced on trial basis in 1971 but was quickly removed for safety reasons. The risk of in -flight fire was too great for such a new and radical system. Alo in event of a crash landing, it was feared that the TV's would detach from the roof and crash on somebody's head killing them!
here is the link to this very good and highly recommended book...