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Repair guides and disassembly information for the MacBook Pro 16'' released in November of 2019. Model A2141, EMC 3347.

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Magnetic Reed Switch Work Backwards?

TLDR: Tried cleaning my Mac, messed up reassembling it, got a screw stuck, tried fixing it today, MacBook turned on automatically while unscrewing, I turn it back off. Mac won't sleep when closed but wake up when closed after being put to sleep. Reed Switch work in reverse or damaged.

Okay, I screwed up trying to disassemble my Mac.

4 months ago, I took my Mac apart to clean the fans, and when I put it back together, a screw (bottom left, seen from the keyboard) got stuck and is half out, and the head of the screw is unusable because I pushed too hard.

Today I wanted to try and remove the screw, so I removed the others, with the aim of being able to move the lower case, and maybe unstuck the screw.

I turn off my Macbook, close it

I remove the screws, except the stuck one, then I slide a cardboard card between the lower case and the computer on the top left side (keyboard view), and my MacBook turns on automatically, because I forgot to remove this function. I turn it back on, then come to my senses and tell myself it's no use going to all that trouble and risking breaking my computer for something I can live with.

I put everything back in place, turn my computer back on by pressing the button, put on some music, then close my computer, the music doesn't stop. I reopen it and see that it hasn't gone to sleep. I look on the software side to see if anything has magically changed, but nothing, so I do some research on the hardware side to find out how the Mac falls asleep when I close it, and I think I've broken the Reed Switch with the cardboard card.

I put my computer to sleep manually, then shut it down. When I reopen it immediately afterwards, my Mac is awake, but if the Reed Switch isn't working, it shouldn't be. So I've come to the conclusion that the Reed Switch is working in reverse because of the reboot during the repair.

Does anyone have a solution to put the Reed Switch back the right way?

Mise à jour (08/13/23)

just tried to reset SMC, didn't worked

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of course I've already rebooted and reseted NVRAM

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Ouch! Not good😫😩

The Hall sensor system in this series is very different than in past models!

Apple went from a contact-no contact setup to a rotating sensor which measures the rotation of the magnetic flux!

The sensor and magnet is shown in Step 13 in MacBook Pro 16" 2019 Teardown

If it’s not working and you are sure you correctly remounted it as seen in the guide then the ribbon cable is likely damaged! Which requires a new sensor unit.

Aie! Pas bon😫😩

Le système de capteur Hall de cette série est très différent de celui des modèles précédents !

Apple est passé d'une configuration sans contact à un capteur rotatif qui mesure la rotation du flux magnétique !

Le capteur et l'aimant sont présentés à l'étape 13 du démontage du MacBook Pro 16" 2019

S'il ne fonctionne pas et que vous êtes sûr de l'avoir correctement remonté comme vu I. Le guide puis la nappe sont probablement endommagés ! Ce qui nécessite une nouvelle unité de capteur. Aie! Pas bon😫😩

Le système de capteur Hall de cette série est très différent de celui des modèles précédents ! Apple est passé d'une configuration sans contact à un capteur rotatif qui mesure la rotation du flux magnétique ! Le capteur et l'aimant sont présentés à l'étape 13 du démontage du MacBook Pro 16" 2019 S'il ne fonctionne pas et que vous êtes sûr de l'avoir correctement remonté comme vu I. Le guide puis la nappe sont probablement endommagés ! Ce qui nécessite une nouvelle unité de capteur.

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oh dear god

If I understand correctly I have to change this piece ?

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@danj English is not my first language, so I'll repeat what I've understood. The sensor has been moved, so I have to dismantle my Mac, put the sensor back on the right side. And if that doesn't work, the sensor has been damaged and needs to be replaced. Is this correct?

Do you have the exact reference of the sensor?

(god I hope it just has been moved when I did the thing with the cardboard card)

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@augustin28029 - Look at the images in the teardown I linked to (blue URL) the sensor parts need to look like the image.

If that fails to fix the issue or the sensor is correctly placed then it’s damaged and will need to be replaced.

Regardez les images dans le démontage auquel j'ai lié (URL bleue), les pièces du capteur doivent ressembler à l'image.

Si cela ne résout pas le problème ou si le capteur est correctement placé, il est endommagé et devra être remplacé.

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I love you so much man, thank you for the help, I'll do it tomorrow after finding a way to unscrew the damaged stuck screw. Thank you so much again

EDIT: So I've searched around the internet for a Lid replacement, it looks like I'll need to go to a AASP to get it replace since there's some calibration bs on it.

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