I am looking to buy a used part for a Sony T.V.

My parents just gave me a KDF-E42A10 Sony television but it does not display a good picture.The picture is real snowy and there are vertical lines on it.My father had a technician look at it and he said the tv needed a "B Block".I don't have a part number for this "B Block.I was hoping someone does know where I could buy this part used.The technician told my father that this "B Block" part cost $850.00 new.I can't afford to put that much money in it for a new part.I was hoping that someone would know this part# and where I could find it used at reasonable price.Thank you.

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