I bought a 96 SR5 in January and the power antenna is frozen in up position (not sure that has anything to do with this issue though). FM radio is fine, but when I switch to AM I get nothing across the dial. I do see the frequency numbers and if I manually increment the frequencies, can see the little 2, 3, etc of the button settings. I've also tried setting it to known-strong stations in this area with volume all the way up. I hear hiss, but no voice. Not even a faint one among the hiss. Any ideas?