For some reason when I hook up an antennae to the Ant. A or Ant. B input and do a search it finds no channels. Even if I enter a channel that I know works it still says "weak signal" and displays nothing. I've hooked my the same antennae source to another TV and it displays channels. I've also tried hooking the cable box output to it and it's still not finding any channels. I've been completely through the owners manual and have gone through all of the menus many times with no success. I'm no dummy, I hooked up my Sony 50", Yamaha Receiver, JBL surround, Toshiba DVD/VCR, high-def cable box, etc. on my downstairs TV.