recurring black outs

My trinitron has joined the off again/ on again video club whether we are watching tv, dvd player, on demand, or video games but I have noticed that if I turn on the cable tv guide where you can still watch your program in the small corner screen it will not black out. I watched the whole 7 overtime innings of a Phillies game like that without a single loss of my picture. It wasn't the 32" picture I paid for but I didn't miss a play. I wonder why this would make a difference?

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