B727-200 RPTR EXPERIENCED WAKE TURB FROM A B747 ON A VISUAL APCH TO LAX RWY 25.

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ON AUG/XX/96 WHILE ARRIVING ON THE CIVET 1 ARR INTO LAX RWY 25L APCH; FLAPS WERE SET AT 15 DEGS DSNDING FROM 6000 FT AND ARRIVING CLOSE TO 5100 FT. OUR ACFT; A B727-200 SERIES; WAS CLRED TO LAND BEHIND A HVY B747 LEAVING 7000 FT ON BASE TO FINAL. THE CTLR CONFIRMED WE WERE 5.1 NM BEHIND THE TFC. AS THE B747 ROLLED OUT IN FRONT OF US AT 5100 FT OUR B727 WENT IN A VIOLENT ROLL TO THE R. I APPLIED FULL OPPOSITE AILERON; RUDDER AND PWR. THE B727 WAS STILL ON ITS WAY ON ITS BACK WHEN ALL OF A SUDDEN THE CTLS TOOK EFFECT. WE TRIED TO STAY ABOVE THE GS; BUT THIS DIDN'T WORK EITHER. I BROKE THE APCH OFF TO THE DISMAY OF THE APCH CTLR. ON THE GND IN LAX I WAS ADVISED TO CONTACT APCH CTL SUPVR. WE HAD SOME WORDS; AND I HOPE THE MATTER IS SETTLED. IF I DIDN'T HAVE A SETTING OF FLAPS DOWN; SO I COULD USE MY OUTBOARD AILERONS; THE INBOARD AILERONS WOULDN'T HAVE BEEN ENOUGH TO COUNTER THE ROLL. WE WOULD HAVE BEEN ON OUR BACK WITH NO RECOVERY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE WAKE TURB CALLBACK PROGRAM. THE RPTR WAS VERY HELPFUL AND ANSWERED ALL OF THE QUESTIONNAIRE ITEMS.