Can someone please help me with newly fitting blank display?

Question

MacBook Air 13" Late 2020

Apple의 Arm 기반 M1 SoC(8코어 CPU 및 최대 8코어 GPU 탑재)를 탑재한 최초의 13인치 MacBook Air에 대한 수리 안내서, 지원 및 문제 해결 정보입니다. 2020년 11월에 출시되었으며 모델 번호 A2337 또는 EMC 3598로 식별됩니다.

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Gary Ogilvie @f4ll3n

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Can someone please help me with newly fitting blank display?

Hi all,

I replaced a display on a customers late 2020 M1 Macbook Air 13" using the iFixit guide. All powered on, display looked fine but it was a bit clicky so I unscrewed the hinges and realigned it (didn't unplug any cables at the time - other than the battery).

Now the display is completely blank, although I can hear the mac noise on startup. I get nothing when I plug in an external display (but I know it doesn't show sometimes unless logged in). I have unplugged the display cable and tried an external display again but still nothing (still makes the startup sound).

Have disconnected and reconnected cables, checked they are not damaged and all look OK.

Can someone please help me work out what the issue is?

Many thanks!

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Alisha C @flannelist

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In my experience Apple Silicon based machines are really weird about outputting to external monitor at times. I have heard more than one case of these machines (as well as having personal experience) that still report an internal display detected, even when there isn’t one. And it will attempt to output to the primary display first. In fact if your machine has FileVault on, likely it won’t output to the external monitor until you’ve logged in.

As for what’s going on, was the old display functional enough to test and see if it still works when it’s installed? That may be worth testing.

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댓글 17개:

Thanks for the reply. After logging in I get a visual on the external display. I have reconnected the original display, but that is completely blank too now (before it was blank, but you could see some backlight through the crack - now there is nothing).

Really puzzled as to what is causing this.

Gary Ogilvie 의 2023년 4월 28일

@f4ll3n - You need the display mounted, and closed to enable the external display (called Clamshell Mode) using an external keyboard and mouse/trackpad.

Sadly, it does sound like the displays cables might have gotten damaged. Was it working just after you replaced the display? Was this a new or a used unit?

Dan 의 2023년 4월 28일

Hi Dan, new unit - was working fine. Never touched the cable when I was adjusting the hinge, but then stopped working. Does sound like a display cable seeing as the old display has no backlight at all. Very odd though seeing as I never touched it and it wasn't caught.

Changed a Macbook Pro display not too long ago, more complicated but no issues.

Gary Ogilvie 의 2023년 4월 28일

@f4ll3n - Using a flashlight see if the display lost the backlight by pressing it against the display at an sharp angle do you see a faint image of the desktop and its icons? If not then the displays data side is messed up, if you do then the backlight logic needs to be checked.

I’m assuming when in Clamshell Mode then external is working.

Dan 의 2023년 4월 28일

Hi Dan, there's nothing at all on the display even using this method. External display is fine.

Gary Ogilvie 의 2023년 4월 28일

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Thanks for the reply. After logging in I get a visual on the external display. I have reconnected the original display, but that is completely blank too now (before it was blank, but you could see some backlight through the crack - now there is nothing).

Really puzzled as to what is causing this. — Gary Ogilvie
@f4ll3n - You need the display mounted, and closed to enable the external display (called Clamshell Mode) using an external keyboard and mouse/trackpad.

Sadly, it does sound like the displays cables might have gotten damaged. Was it working just after you replaced the display? Was this a new or a used unit? — Dan
Hi Dan, new unit - was working fine. Never touched the cable when I was adjusting the hinge, but then stopped working. Does sound like a display cable seeing as the old display has no backlight at all. Very odd though seeing as I never touched it and it wasn't caught.

Changed a Macbook Pro display not too long ago, more complicated but no issues. — Gary Ogilvie
@f4ll3n - Using a flashlight see if the display lost the backlight by pressing it against the display at an sharp angle do you see a faint image of the desktop and its icons? If not then the displays data side is messed up, if you do then the backlight logic needs to be checked.

I’m assuming when in Clamshell Mode then external is working. — Dan
Hi Dan, there's nothing at all on the display even using this method. External display is fine. — Gary Ogilvie

MacBook Air 13" Late 2020

Can someone please help me with newly fitting blank display?

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