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Original post by: Dan ,

Text:

I think you'll need to test the ribbon cable connection on the logic board using a DVM. Review this IFIXIT guide: [guide|10957|MacBook Air 13" Mid 2012 Logic Board Replacement]. Jump down to Step20. You'll need to make a set of microprobes with some sewing pins as you'll want to test the voltage at the ribbon as it enters the connector.

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