On our new 3725, I was tearing my hair out trying to figure out why I couldn't get the satellite to work. It worked for the bedroom TV but not the living room (separate cable feeds). Finally discovered that, as mentioned, the crimping was not done right. It was not the main center wire, it was the shielding (ground) around the cable that kept it from making a complete circuit. They can work loose just from vibration, if not done correctly.
