I had a similar problem.... mine showed that I had full signal strength on all local stations in FM.... however no sound. In AM I got a lot of stations. I ended up sending both the head unit (faulty power connector) and the Tuner module to the UK for repair. They did pay for fedex express to and from, I'm still waitiing to get them back. I'll let you know what support says as to whether or not you really have to send it back or if theres something else going on that no ones encountered yet.