I just got one from the flea markets for $10, theres no screws in it so i think some one has open it, i dont know if its on or off as it has a red stickter to repersent on in stead of the red led light, im trying to tune it in but no luck, it didnt come with a power back or RF, so im using my NES ones, i dont know if that will help, i live in australia and use PAL.
Thanks for the help