B757 EXPERIENCES CABIN SMOKE AND FUMES. DIVERTS TO NEAREST SUITABLE ARPT.

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APPROX 20 MINS AFTER TKOF; PAX NEAR MID GALLEY AREA (ROWS 9-11) SAW SMOKE AND SMELLED NOXIOUS ODOR. FLT ATTENDANTS WERE TOLD. #3 FLT ATTENDANT CAME BACK TO ME IN THE AFT GALLEY. SHE SAID TO STOW EVERYTHING; GET YOUR HALON AND PBE; THERE'S SMOKE IN THE CABIN. THE #1 INFORMED THE CAPT. WE SEARCHED FOR THE SOURCE; COULD NOT FIND IT. THE SMOKE DISSIPATED; BUT THE ODOR PERSISTED. THE CAPT THOUGHT IT MIGHT HAVE BEEN THAT THE RECIRCULATING FAN HAD BURNED OUT. I STAYED NEAR AFT GALLEY AND TURNED OFF THE VIDEO PLAYER; AND CALLED THE #1 FLT ATTENDANT ASKING HER TO TURN OFF LIGHTS. SHE HAD TURNED OFF THE PWR PORT SWITCH AND THE GALLEY PWR WAS OFF. WE FELT THE CEILING FOR HOT SPOTS; OPENED OVERHEAD BINS AND KEPT A CLOSE WATCH WITH FIRE EXTINGUISHER AT HAND. THE CAPT DECIDED TO LAND. THE MECH FOUND THAT ONE OF THE TV MONITORS WAS FAULTY. I BELIEVE IT SHOULD BE PROC TO TURN OFF ALL ELECTRICAL SOURCES. WE ARE TOLD TO TURN OFF THE PWR PORT SWITCH; BUT NOT THE VIDEO MACHINE. IF THIS HAD REMAINED ON THE FIRE WOULD HAVE BEEN MUCH WORSE.