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Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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screen won't turn off when closing lid

Just changed the MagSafe DC-in board, followed every step on guide, now my screen won`t turn off when closing lid. How can I fix it?

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Check your ribbon cables. It sounds like one is not correctly seated.

I would check the hard drive cable first as it has the sensor attached to it. Review Step 26 in this IFIXIT guide MacBook Pro 13" Unibody Late 2011 Upper Case Replacement

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The screen sleep magnet could of slipped out of place or energy saver could be set to "never sleep". You could also try to reset the SMC---http://support.apple.com/kb/HT3964.

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I have the same problem with sleep mode.

SMC reset and replacing sensor without success.

BTW I don't know how to replace the sensor of sleep LED and lid. Can anybody help me?

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What sensor do you replace?

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Replacing Ribbon Cable from HDD with IR Sensor and LED. But i don`t know, where sitting the sleep sensor

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The lid sensor is a small Hall effect transistor which is mounted on the ribbon cable assembly you replaced. It is part of the plastic bracket where the the IrDA sensor is located. It you take a steel paper clip and slide it across the left sides of the displays edge of the lid you'll locate the magnet which mates up with the Hall effect transistor in the case when the lid is closed.

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how he looks the effect transistor ?

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Please review this: Hall Effect transistor

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