Display on MacBook is Dim

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MacBook Air 13" Mid 2013

듀얼 마이크와 802.11ac Wi-Fi 연결 기능을 갖춘 더 큰 Apple MacBook Air 노트북 입니다.

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Mike Halker @mikehalker

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게시일: 2019년 1월 17일

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Display on MacBook is Dim

Spilled a few drops of water on MacBook Air.

Screen is dim but working (I have to shine a flashlight on it to see it). Works fine on external monitor.

Took it apart and found nothing. All cables, etc. are seated fine, good continuity on ‘P’ fuse for backlight and no corrosion anywhere. Apple on back of MacBook no longer lights up.

Would seem odd to be the logic board since the drops of water were on the power button side of the keyboard. Any ideas? I’ve done all the PRAM resets, etc. listed in the solutions here but nothing is working so it must be a problem I can’t see.

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Dan @danj

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The display cable and the backlight logic are right under the power button! Remember when you are looking from the bottom (left) you are in truth looking on the tops right side.

You’ll need to check the backlight MOSFET and its support logic. Do you know how to use a DVM?

I suspect you have either a bad solder joint or the chip is blown Q7706 (FDC638APZ)

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I do know how to use a DVM. I've got the case open and I see the parts you're referring to. I just check ohms across the three? If the chip is blown is it possible to replace? I'm not really into microsolder.

Mike Halker 의 2019년 1월 17일

You want to check the voltage of PPVIN_SOSW_LCDBKLT_FET and ground.

Best to find someone with the needed skills & tools. The part is available On Semi FDC638APZ

Dan 의 2019년 1월 17일

So if we're checking voltage I'm assuming we'll have to open it up and then turn it on and check it. I agree, we're beyond my skill level. Thanks for the help.

Mike Halker 의 2019년 1월 18일

Sorry guy we all can't be doctors ;-}

Don't forget to accept the answer and score it.

Dan 의 2019년 1월 18일

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I do know how to use a DVM. I've got the case open and I see the parts you're referring to. I just check ohms across the three? If the chip is blown is it possible to replace? I'm not really into microsolder. — Mike Halker
You want to check the voltage of PPVIN_SOSW_LCDBKLT_FET and ground.

Best to find someone with the needed skills & tools. The part is available On Semi FDC638APZ — Dan
So if we're checking voltage I'm assuming we'll have to open it up and then turn it on and check it. I agree, we're beyond my skill level. Thanks for the help. — Mike Halker
Sorry guy we all can't be doctors ;-}

Don't forget to accept the answer and score it. — Dan

MacBook Air 13" Mid 2013

Display on MacBook is Dim

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