Los Angeles Times August 26, 1990, Sunday, Home Edition MIXED MEDIA; *** 1/2 "THE VALUE OF IGNORANCE" SINEAD O'CONNOR, POLYGRAM MUSIC VIDEO ($19.95): ITEMS IN THIS PERIODIC SURVEY OF POP-RELATED BOOKS, VIDEOCASSETTES AND LASER DISCS ARE RATED ON A SCALE OF ONE STAR (POOR) TO FIVE (A CLASSIC). By CHRIS WILLMAN O'Connor and director John Maybury avoid the most obvious -- and ignorant -- approaches to filming music in this 35-minute video of a 1988 London concert. Nearly all camera angles are close-ups of her famous profile; though a backing band and crowd noise are heard, one fleeting look at the drummer is the only non-O'Connor shot. Sound static? Hardly. All sorts of colorful, abstract visual overlays add to and play with the black-and-white footage, somehow never distracting from the intimate tone the Irish singer strikes on stage; it remains baldly emotional. Johnny-come-lately fans take note: Seven of the eight songs come from her first album, not its current successor.