Why did my back light go out

where can i but a logic board for my iphone 3gs

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tyrone, I noticed that you posted 4 questions about the logic board and the backlight at the same time. Are these different phones or are we talking about the same phone 4 times? I am sure the answers will all be the same....

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Your LCD may have just burned out, or it could be water damage. You need to be more specific on what happened. Ebay is where you can buy a logic board, but careful on what you buy out there.

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