Does it happen on all channels? If not, is there any pattern in the channel numbers in which it happens?
You mentioned a cable--have you tried replacing the cable? A bad cable or connector might cause spurious signals, but that would probably affect all channels.
__________________
-- Andrew
Just Andrew.
Do I contradict myself?
Very well then, I contradict myself.
(I am large, I contain multitudes.)
-- Walt Whitman, "Song of Myself"
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