Samsung HDMI failing to recognize non-HD

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Joined Mar 23, 2009
For the last 9 months, I was enjoying my HD signals from my satellite box via my hdmi interface (HL-T5087S). last week, any signal lower that 720i generated a "non-supported" format display on screen. I reverted to my "s-video" cord and the problem is absent. All signals are displayed fine. I replaced cable, box and tried each hdmi port. Could the board have gone bad? Is this customer replaceable?