Wei

I just noticed recently that the AM channels on the radio does not work at all in my 07 TSX and I was wondering if anyone else have experienced this before? FM and FM 2 works just fine, as well as everything else..cd, aux sat...but all I get from the AM is nothing or static. Im going to look through the service manual when I get a chance, but in the mean time does anyone have any clue what the issue might be? Tnaks in advance