You can probably take the logic board out of a 475 and put it in your LC as a type of upgrade. I'm not 100% sure it will fit but it seems like it should.

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... and the point would be?

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I was thinking this would be an option if he wanted to keep the same original LC case for nostalgic reasons and only upgrade the inside. There would probably be no functional or structural point in doing this though.

I wasn't aware the board wouldn't be a straightforward swap so that would complicate things.