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{A1989 / EMC3214}—Erschienen im Juli 2018. Das 13" MacBook Pro ist mit Quad-Core i5 und i7 Prozessoren und Intel Iris Plus integrierter Grafik ausgestattet.

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Why has True Tone disappeared after screen replacement?

Replaced LCD assembly (with correct 2018 screen) on MacBook Pro Touch Bar 2018. I noticed after reassembly that the Touch Bar is constantly on full brightness, and the keyboard backlight is always off.

While trying to troubleshoot the ambient light sensor, I went to check if True Tone was enabled or disabled, and noticed the “Automatically Adjust Brightness” and “True Tone” options have vanished entirely from Display Preferences.

What’s happened?

Beantwortet! Antwort anzeigen Ich habe das gleiche Problem

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What was the P/N of the display you put in and where did you get it? It sounds like you got the wrong display assembly.

von

Thanks Dan. I believe it's 661-10037 but is there a way I can independently verify that on the actual hardware?

I've noticed the keyboard backlight settings have also disappeared from the Keyboard System Preferences window - even those that don't seem to rely on the ambient light sensor. The keyboard brightness buttons are still on the Touch Bar but don't do anything.

von

I have just completed the same repair and have the exact same symptoms on my 2018 TouchBar. Everything else is working exactly as it should be. Did you ever find a solution to this?

von

Hi Maxwell, unfortunately I couldn't solve myself. Had it fixed by Apple.

von

Were they willing/able to fix it knowing that you repaired it yourself? Im in the same boat here i guess.

von

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I just did the replacement screen (LCD only) on a 2018 model a1989. Everything works perfectly and the reason for that is probably because I kept everything original and replaced just the LCD. I’ve heard rumors about the T2 chip causing issues for repair and most likely that is your problem. The only way to keep True Tone would be to keep the front camera flex (most likely this is where it’s paired). One way to test this and confirm would be if you still had your original LCD assembly and you can just plug in the front camera flex which is the connector closest to the LCD connector on the LCD board. There should be a somewhere that says SV_CAM (on mine it also says J0802) Plug it in, boot up and see if everything is working perfectly afterwards. Good luck

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Thanks - I will try this. I assume if the problem is with the T2 chip 'rejecting' the new hardware, that Apple themselves can override this.

von

Confirmed that with the original LCD assembly everything comes back (True Tone, auto brightness). If the Apple ASP could pair the new screen they weren't offering to. They offered a replacement logic board and screen for the price of an entry-level MBP 13".

That ends this adventure for me - the old screen (with cosmetic damage) is staying in place.

von

Follow up: the 'fix' only lasted through one boot. Message appeared on opening saying machine had restarted due to a problem. The camera, true tone, auto brightness and keyboard backlight had all disappeared again.

All I can think of now is a problem with the connection.

von

@stuartmc Hello, have you resolved this issue? I have met the same issue, No Camera/No Auto brightness/No True Tone. But I didn't change any part of my Macbook Pro 2018. It's wired.

von

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What I can tell you is the 18/19 use a very different display than the older models. What happens is people use the older one 16/17 which is cheaper and if it came from a parts system will have the shorter backlight cable.

Here’s the correct display assembly:

This is what you likely got even though the P/N you gave me is the 18/19 Space Grey display assembly. The only other possibility the part was either mis-binned or the part was mis-marked.

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It's possible. The part was comprehensively labelled as an A1989 (rather than A1706) replacement, and looked in every way similar to the one I removed.

Is there any way visually or through the OS to identify which of these two the screen actually is?

von

Sorry I don't of any way physically as the display assembly looks the same.

I don't have a system presently so I can't tell you if this works but you could look at the displays config info in System Report under About This Mac and then going to Graphics/Displays see what it tells you.

von

No. The A1706/A1708 and A1989 original LCD Assemblies are not identical. It is super easy to tell them apart.

Just look at the hinge. The A1706/A1708 hinges do not have rings, while the A1989 and above have sort of lines and rings on them. True Tone, Ambient light sensors will all work if you use the original LCDs. They don’t need to be paired or calibrated by an AASP. Not sure about the M1 models yet. Even the ifixit publishers sometimes get their info wrongly.

von

@just1ed - Thats why I've not had an issue as I only use used Apple displays.

von

Well you've mentioned there isn't any way to tell them apart as they look physically the same. They aren't.

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That sounds super weird. I have just replaced my display on my space gray A1989 and everything is still working. I never transfer front cam flex or anything. I just bought a used full diplay(with metal cover). But i also SMC and PRAM/NVRAM Reset. Just in case i did it in very first start of the mac after replacement.

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Can you tell where did you buy the screen? Thanks.

von

It differs model by model. Whichever Apple decides to serialise, serialisation is beginning to be a huge issue in third party repair meaning even when you change original parts for original parts, some or all of the functions will stop working for that part.

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I have the same issue with my A1989. No backlight on the keyboard and no True Tone. Also no camera detected either. My screen isn’t genuine Apple and it was replaced with a Chinese one. did anyone solve this>?

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Never got it to work with the 'new' screen. Only got it to work by bringing to an ASP :(. Don't have a definitive root cause, but the evidence points to the new screen not only not working itself, but causing something else to break.

von

Same here. The camera is detected on System Report, but not functioning on other apps, like FaceTime, Skype, etc. The FaceTime shows "No Video, FaceTime has not received any video from the connected camera. Restarting your computer may fix this issue."

von

@sandyardianto Hello, have you resolved this issue? I have met the same issue, No Camera/No Auto brightness/No True Tone. But I didn't change any part of my Macbook Pro 2018. It's weired. Thanks.

von

It was resolved after an Apple repair shop changed top case, mainboard and display cable (!). And now the same problem has occurred again.

von

hello, same issue here. change screen and true tone, camera, and keyboard backlight not working, replaced for the old screen and the problem persists. Any solution?

von

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Several answers here, just to clear it up:

This is to do with apple’s serialisation as Alfy suggested.

There are some models where screen replacements work fine (if a good quality screen is bought) but in my experience the ambient light sensor is almost always serialised so keyboard backlight is either disabled entirely because of the sensor not registering as the original or you turn off auto brightness and manually control screen and KBD backlight. Same for True Tone.

as Alfy also said it is paired through the camera so you would have to transfer the camera flex from old to new screen but bear in mind replacing LCD only is not an easy repair by any means

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Thanks @jamiehorn. Do you have any idea why the backlight/True Tone problem persisted even when the original screen was reinstalled? I (unfortunately) reproduced this twice.

von

The only reason I can think of is either the system unpaired the original ALS or it was potentially damaged. When I first stumbled across this issue it was on an A1707 and I reinstalled the old display and functions came back so this is definitely odd. If you still have it I’d put the original on and then perform a T2 restore to see if it works

von

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Intel MacBook Air and MacBook Pro LCDs do not have security features and are NOT paired to the Logicboard. True Tone will work (both third-party and original.


Only M1 and above models are paired. True Tone will be disabled but auto brightness and FaceTime Camera works.

They are serialised, but only for the purpose of verifying your warranty to ensure your Mac comes with the same LCD it is sold with, and even then not all Apple stores check them.

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The hinges for the Macbook Pro 13” 2016-2017 (A1708/A1706) are physically different from 2018-2019 (A1989/A2159). This only applies to original Apple parts though.

Aftermarket third party OEM LCD assemblies may reuse the same shell but put in a different LCD inside.

In any case, if you use a 2016-2017 on a 2018-2019 Macbook Pro, not only will True Tone not work, the entire LCD will be extremely dim after it logins to the desktop to the point it is nearly not visible.

So if the display works, but there’s no True Tone, it means your OEM or Third Party part or the original part has a failed True Tone camera. It is rare, but possible for original parts not to have Facetime camera or the True Tone sensor working.

T2 does not affect anything. True Tone will be disabled only on M1 and above Macbook Pro and Macbook Air. The LCD has to be paired, which currently only Apple and AASPs can do. Facetime camera will work.

If True Tone or the FaceTime camera does not work, it is either the LCD itself, or that you have shorted out a component on the Logicboard.

Very slight misalignment when fixing back the LCD connector, or that your battery screw was not removed well before the lcd is replaced can short out the camera or True Tone component circuit on the Logicboard.

You have to tell the Chinese sellers you want True Tone, camera and auto brightness to work, and get them to show you the testing videos.

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hi, i have your same problem after replacing the display. You solved?

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Not yet. Are you having the same problem with the keyboard backlight too, or just the screen?

von

the keyboard backlight and the truetone do not work. i also have some noise to the bluetooth antenna but i don't know if the problems are connected.

von

Sounds similar. A local repair shop has swapped the topcase/keyboard, screen and ribbon cables, and it's still not working. I can't help but wonder is the OS or some component simply not cooperating with a new screen.

I'm going to have the board checked next.

von

See chosen solution above.

von

is there a solution for this problem yet? I purchased a used macbook pro 15" A1990 screen for my 2019 MB and after the replacement, my camera, truetone and backlight are dead. I will not accept that all of use replaced our screens and that we all either shorted the one connector out for the screen or the battery connector arced... So its it software or what?

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Stuart Mc wird auf ewig dankbar sein.
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