i have the same TV with the same problem. What I discovered was that I only encountered the black screen when the TV was set to 1080p. On 1080i it was fine. My Telus box says it can handle 1080p but there is an issue somewhere. Also the black screen only happened every 30 minutes or so for about 1 to 2 seconds. Software is up to date so I just live with the 1080i setting. Not as good though.
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