It may be an HDCP (High-bandwidth Digital Content Protection) handshake problem. When tuning to some HD channels, HDCP handshaking must occur between the stb and the tv. If this does not happen as expected the video may not be viewable. As to whether its the stb or tv at fault, I suggest searching for other posts involving the particular model stb and tv and HDCP problems. Problems are often encountered when the digital signal (HDMI or DVI) is routed through an intermediate device such as a switch or a/v receiver.
If your stb is the Motorola DCT6xxx series (the 6200 has DVI), you do have the option to send 4:3/SD either as 480i or upconverted. I prefer the former over the latter.
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