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I also found that my specific Televisions in the LR and BR can be configurable to select a cable setting or a TV setting from where to get its signal to display. Have you checked this? I ran into it long time ago when using the remote and going through the menus and trying to debug poor displays on the tube.
I don't remember the selections that work the best, but I do remember that depending on what was selected could make a difference.
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