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Samsung LE52M87BDX, black screen for 5-10 minutes

Good morning
my TV SAMSUNG LE52M87BDX at start remain black screen for many minutes before the image come on.
I have found on the web a new original power card BN44-00150B but the problem remain, time of start very long (5-10 minutes).
Someone can help me?
Thanks Vittorio Cionini