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Mis sur le marché en juillet 2018, le MacBook Pro 15", modèle A1990, est muni d'un écran de 15,4 pouces avec rétroéclairage LED et technologie True Tone et d'un processeur 6-core i7.

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True Tone and Webcam Disabled after screen replacement!

Ok we swapped the LCD with a known working LCD with True Tone and Webcam enabled. After we installed it on another Machine it was disabled and no True tone anymore. We took the original LCD back off and put it back on the Machine it originally came from…now True Tone and the Webcam is disabled on this machine as well! Can someone explain why is this happening? People are saying replace it with a known working LCD oem from Apple…well we just did that and now both screens are disabled. What is going on here?

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Also the Keyboard backlight is gone as well on both computers. Anyone have a suggestion?

par

Did you ever get this issue resolved

par

I would assume so. Basically the solution was that there's nothing we can do because apple pair parts to their devices.

par

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Yep! Apple updated the system firmware on us so now you can’t swap displays any more!

Your display has a ID which your system will only recognize. This ID needs to match and if you put a different display on and the ID is different it won’t accept it, now the real nasty! The system will loose the original ID so if you put the original display back on it won’t recognize it either again!

All I can say is - THANK YOU APPLE!! NOT!!

Such a bonehead action on their part! You’ll need to visit an authorized Apple shop to see if they would be so kind to recalibrate the display. Such an easy fix on Apple’s part to offer the needed tool or even program the EFI (BIOS) to allow calibration.

SUPPORT the Right to Repair movement

Apple needs to breakout of this mind set!

Update (03/17/2021)

See if resetting the SMC fixes the keyboard backlight How to reset the SMC of your Mac Otherwise you’ll need to check your cable connection for damaged pins on either the cable or logic board.

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We never disconnected the Backlight keyboard etc. we took an original oem working LCD off of a good 2018 model 15" for testing purposes (this was on our employees computer without any issue, we took it off to just test it the other LCD on his computer and then put back the original LCD that was on and it now has no backlight, webcam or True tone) we are bummed out that this happened in a 2018 but we replaced 2019 and 2020 models without issue and the T2 chip accepted them. So question arises why the 2018?

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Behind the scenes Apple updates the systems firmware when you install OS updates. What was possible is no more!

Think it this way .... I have two exact systems: System A has firmware #1 no issues moving things about. System B has firmware #2 but unlike system A its not allowing the hardware change!

par

Yeah this is unfortunate. We were told maybe doing DFU mode on T2 and forcing a firmware patch would maybe fix his computer. But we did that on the other computer to no AVAIL.

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@mangel90970 - Both the Intel and M1 systems (likely M2 as well) require firmware held within the display camera unit.

The issue on the Intel MacBook Pro’s where a virgin display from the hardware maker doesn’t get the firmware installed, Apple does that at the point of assembly. So to side step this you needed a used display as it would have had the firmware installed.

Apple has added additional locks! So while we could get the display and camera working just without TrueTone with a used display Apple has now prevented that on T2 based systems and the M1 systems.

With the M1 or M2 systems Apple will gladly sell you the part! And give you access via a paywalled server to the needed calibration tool. Be warned! You need to use the supplied parts S/N and it’s a one time action if successful.

par

Would this issue get solved if we downgrade the OS

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The information Dan posted is incorrect. You may have damage some lcd connector pins while replacing or your OEM screen is of poor quality. All screens for all models before M1 can be replaced without losing any functionality. True Tone will work. I have just replaced a 2019 16” model.


Only M1 models have the LCDs paired with the Logicboard. If the lcd is replaced, True Tone will be disabled. FaceTime camera will still work though.

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The source of the display is the root issue a virgin display won't have the calibration and won't work with TrueTone services. A used display pulled which had been calibrated will work just fine.

I haven't worked on any M1's yet so it wouldn't surprise me Apple has made it still harder! The solution is for Apple to offer the needed calibration process and tool.

We faced the same thing with car makers locking out independent repair!

Here in MA we got the car makers to supply access to the repair data and tools via a Law. They tried to get around the Law trying to use over the air data access. We went back and updated the Law and we are waiting to see were things go as come Jan 1st they can't use that means without giving access to independent repair shops who are working on that given car.

FYI - Your access to repair data and tools today is based on what we managed to get in the first Law as they couldn't do something different for us than the rest of the country!

par

Yes the part source is the issue. That’s exactly what I’m pointing out.

You’ve mentioned in a previous post that Apple has updated the firmware and two exact displays from two identical models cannot be swapped out because of firmware updates. That is not true. That was what I am correcting.

We are still using Mojave-Catalina era old 2018 LCDs to test on Big Sur era MacBook Pro, without issues.

You can swap, instead original or OEM LCDs without issues for pre-M1 models and have True Tone enabled.

There are also third-party parts with working True Tone as well. We have installed them without issues.

A lot of third-party LCDs do not have them. It’s more likely the sensor isn’t really there, rather than it’s not calibrated.

These are parts with third-party shells, third- with third party inner LCD, backlight and third party ICs.

ID pairing is only enabled in M1 and the newer M1 Pro / Max systems.

par

I have and M1 matchbook pro and I just installed a new display myself with issues with the webcam issue. Both display were virgin displays and I don't believe it has updated firmware the display is working but the camera is not. Does this have to be calibrated at an authorized retailer?

par

As far as i can tell from the information above, it does. I'll close this question because it's getting a bit old. Unless anyone has anything else they want to add

par

a System Configuration post repair for any newer MacBook is required. (2020 +) requires this and this can only be done by an authorized or Apple Store and who knows if they will even do it for me.

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This just means you have damaged the display, especially in the connector part in the process of swapping. The battery MUST be disconnected and you need to make sure your hands aren't full of static.

Only the True Tone will be affected if the LCD is not calibrated after replacement by Apple.

The webcam, auto brightness and other issues will NOT be affected by an LCD swap. You can use good OEMs or originals - it doesn't matter.

We have replaced 20-30 pieces in our shops without a single issue with webcam.

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The auto brightness works, it doesn't have true tone and it says the camera is not connected. I've read online with the ones with t2 security chip that virgin displays require system configuration after repair with the m1, and that firmware isn't updated on these displays. I didn't buy from Apple I bought from a auth retailer. I've been very careful to make sure no damage and no static. Are the displays you're talking about replacing m1 MacBook Pro 2020 or newer?

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Yes Intel and M1 but NOT M2. Please go to any reputable shop and ask. AASPs will not sell you the part so I do not know which authorised retailer you are referring to. Whether OEM or Originals does not matter. The displays do not need configuration for any function to work expect for True Tone.

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Stephen sera éternellement reconnaissant.
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