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Switch your PS3 from 1080P to 1080i or 720P, you will have to temporarily connect the old 3 wire RCA connection to your TV set and get to the menu, go to the VIDEO RESOLUTION settings, and set it to 720P or 1080i, ALSO turn ON your HDMI OUTPUT on the PS3 if you haven't done so already.
That should get your TV synced up with the PS3.
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