I have a new Hitachi 42HDT52 TV with built in HDTV tuner. However I wanted a cable card to receive premium tiers. I now get less channels then with the built-in. Some are received but most are black with no errors and no sound. An STB received them all. Diagnostics shows Authorization Received, good SNRs, but 0 EMMs, and a lot of other stuff I don't understand. Hitachi sent new F/W, TimeWarner of Charlotte has been out twice but everyone is stumped. Does anyone have any ideas before I have to resort to an STB? Thanks in advance, Richard