In my personal opinion, I think it’s because of lagging. What I mean is if you switch abruptly, there is a tendency that after you have played your PS3, images from your PS3 or color lines show up in your tv because your PS3 still sends circuit images to your tv. It would be best that you turn off first your PS3 after you have played before you use your Dish HD box. It’s quite risky to use your tv with multiple equipments, all turned on and switching as you please.
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