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Released in May 2020, the 13" MacBook Pro features quad-core Intel 8th generation Core i5 and i7 processors, and Intel Iris Plus 645 integrated graphics. (Model A2289/EMC3456 with two Thunderbolt 3 ports)

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Uneven Keyboard Backlight on 2020 MacBook Pro

Hi everyone,

I have a 2020 MacBook Pro (Intel i5, 13-inch, Two Thunderbolt 3 ports), and I’ve been experiencing an issue with the keyboard backlight. On my device, some keys (Q, W, 1, 2, 3, P, =, -, M, ]) are noticeably brighter than others, which makes the lighting look uneven and a bit distracting in low-light environments.

I’ve checked the logic board connections and everything seems properly seated. There’s no visible physical damage, and the MacBook works perfectly otherwise. I also tried resetting the SMC, but that didn’t solve the issue.

After some research, I noticed a few other users had similar problems, but I haven’t found a clear explanation or fix yet. I’ve attached a photo, and also found a video from another user which illustrates the issue much more clearly than I could capture myself.

Has anyone else experienced this? Is this a hardware issue or just a design quirk? Any suggestions would be greatly appreciated!

Thanks in advance!

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Behind the mechanical keyboard is a sheet of frosted plastic which embedded within it are a collection of tiny LED’s which hopefully illuminate the sheet evenly that then passes the light outwards thru holes in the mechanical keyboard into the discrete key and the letter or symbols are lit.

So … a liquid spill can affect this sheet with a deposit of material which light is prevented from exiting outwards. It’s also possible one or more LED’s have failed as well.

So to gain access to the sheet one needs to remove the logic board as we don’t have a guide for you system you’ll need to follow as best as you can this guide MacBook Pro 13" Touch Bar 2019 Logic board Replacement there are differences but it’s very close to the same process.

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Now looking at the upper case we see a sizable black sheet covering the keyboard area, carefully unglue the edge and the keyboard cable which passes through it, you should then be able to lift it out this assembly this is the backlight unit. If you just had a spill then cleaning the other side should remove what is blocking of the light, otherwise you’ll need to replace it.

This is where things get costly! As Apple doesn’t offer the sheet as a replaceable SKU. You might find it offered as a used part where someone has parted out a system, otherwise it’s a new upper case assembly! MacBook Pro 13" (A2289, A2338, 2020) Upper Case Assembly

Update (03/31/25)

Here’s a better image on the cable end

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Replace an upper case, keyboard, and battery compatible with a 2020 model A2289 or A2338 MacBook Pro 13 inch laptop with two Thunderbolt Ports. Görseli

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MacBook Pro 13" (A2289, A2338, 2020) Upper Case Assembly

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Thank you for the detailed explanation.

However, I want to clarify a few things about my specific situation:

I’m absolutely certain that no liquid has ever been spilled on my MacBook. The device has never come into contact with moisture or any kind of fluid. Additionally, the keyboard itself works perfectly — there are no stuck keys, no unresponsive areas, and no irregular behavior apart from the lighting.

Not long ago, the battery was replaced in a repair center. Since then, I’ve noticed that the keyboard backlight is significantly uneven.

Given that the keyboard works fine and there’s no visible damage, could this be an issue related to the flex cable or its connection to the backlight sheet? Could a slightly loose or misaligned connection cause this uneven illumination?

Also — could you please help me identify which flex cable specifically is responsible for powering or controlling the keyboard backlight? I would like to inspect it carefully or reseat it if possible.

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@kristofnagy -This series uses a unitized interface to the logic board here the fans are wired through the same cable.

While it’s possible the ribbon cable got damaged, not likely in this case as you do have some of the LED’s lit. Think how a string of light bulbs share a pair of lines in parallel one light out doesn’t affect the others, but if one of the wires is cut the down stream lights won’t be lit. Here it’s only a few LED’s so it’s only one that’s not lit.

I’ve added a second image to point out the cable, I really don’t think that’s the issue, if you are sure the system hasn’t gotten wet then it’s just bad luck the LED went on you.

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Given that all the keys do light up, but some are noticeably dimmer than others, do you think it’s possible that this uneven brightness has developed over time, simply due to wear or aging of the backlight sheet or LEDs?

Since there’s still illumination across the entire keyboard and no full sections are off, I’m wondering whether this is something that can be improved by a certified Apple technician, or if it’s considered normal wear at this point and I simply have to get used to it.

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@kristofnagy - Well… it’s not that simple. Think how a sheet of white plastic is lit up from the edge there is enough light to go all the way to the far end, but the face of the sheet will be brightest near the lighted edge and slowly fade to the other side. So, if the string of LED’s aged there collective light would be lower not with a gap of illumination as the video shows. I think you are thinking of contained areas of light, similar to a tiled floor is laid out. This is in fact how a zoned backlight in the newer MacBook Pro’s displays gain better darks as the small areas which should be darker get less light. Here we are not that fancy!

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Just to be sure I understand correctly:

Are you suggesting that the uneven brightness I’m seeing (as shown in the video) is most likely due to individual LED failure, rather than general aging of the backlight system?

If that’s the case, would you recommend taking it to an Apple Authorized Service Provider to have the backlight unit inspected? Is this the kind of issue they might be able to address without a full top case replacement, or is that usually the only fix?

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