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Why do I get these Flexgate like dark areas.

I have a Macbook Pro Late 2013. I got these dark areas at the bottom of the screen. I opend the MacBook cleared all the dust. Also disconnected the screen cable, cleared it with a brush and connected it back togehter.

I have read that pressing shift+option+eject should help. I pressed it alot of times, but it just worked 1 or 2 times, but when i adjust brightness, the dark spots are back.

Reseted PRAM, NVRAM, SMC, reinstalled Big Sur

Would be greatfull for every help.

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Looking at your display connector and how the parts are located your board appears to be a 820-3662. Just making sure the right schematics are being used for the Late 2013

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Thanks.

It's a 820-3662A logic board

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It's the I/O Board

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Thanks for all your answers. I can't open the MacBook. After unscrewing the lid and putting it back together this morning, was enough to damage eight of 10 screws. That is real bad quality.

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@oldturkey03

I checked the votltage on the first pin we have 45v. And on the 6 return caps, we have 5 times 0,8V and one 8V.

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@danj @oldturkey03

44V turned off and 46V turned full on. I have tried to get to the U9701 LED driver. But after taking out one of the fan cables a connector pin went with it and by pullig up the antenna of the wifi board one of those broke too, so i stopped there. As long as the LED are not getting any worse, i will leave it that way. It seems i am ruining more by trying to fix it.

I have taken apart 4 or 5, 2011 Macbooks, but the 2013 is way worse, with all these flatband cables and connectors everywhere.

Thanks for all your replys and your help.

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One of your backlight strips of LEDs are not working. This is either damage to the screen or the motherboard. Both are repairable. If you want to try DIY repair, the first step is to rule out a bad screen—but that can be expensive since it is more common for this to be water damage to the motherboard. Motherboard repair requires Microsoldering so it’s doable but requires special tools and equipment and training/experience.

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Thank you for your answer.I have watched a few videos of disassembling the screen, to get to the LEDs, but i am not going to do that. Seems way to much work. I am capable of doing diy and soldering, but i don’t know which part of motherboard could be damaged. If you know in which area i should look, that would be great.

Could it just be a dislocated screen cable, beneath the plastic bar, between screen and mainboard?

If i turn the brightness level under 75% and press shift+ctrl+eject. It does the job and the shades are gone, but changing the brigthness level brings them back.

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You need to rule out bad screen. If you don't see water at the connector then screen damage becomes the most likely. These fail from water on the board, or DIY repair accidents, or bad screen. It isn't likely to be some hidden failure that you could find with a multimeter if you don't see obvious discoloration at the display connector or water elsewhere in the area. But to be sure, you can take a diode mode reading at the connector and make sure that non of the LED return lines are open

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@saeniv - Before you do anything drastic I would inspect the display connector area. often I find the pins are damaged in someway so one of the LED sets is not powered.

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Post a few pics so we can see your connections Adding images to an existing question

Update (01/21/2022)

I don’t blame you, opening the display assembly is not easy! So let’s look deeper into the logic board side of things.

While the display connector looks good we need to look on the other side of the logic board at the LED driver and its discreet components. Here’s a view of the logic board

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And here’s a deeper view

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Now lets look at the schematics for the driver

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The first thing is to inspect the area so see if you see any signs of wetness and/or corrosion. Take a nice tight clear picture of the area and post it here if you are unsure so we can see things.

Basically I would locate the pin on the chip place my Ohm meter on that location and then find the display connector corresponding pin referencing this schematics snippet. Basically I’m looking for the lines resistance ~ 10.2 Ohms

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Hi Dan,

Thanks for your reply.

Here is a closeup picture of the display connector. Seems fine to me, a little dust, but still good.

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@saeniv - At this point it could be within the display side of the connection as often I find people use a spay cleaner directly on the screen allowing the liquid to drip down wetting the display assemblies display connector and cable end. Otherwise its deeper within the displays LED string or the logic boards LED driver logic pathways.

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Thanks for your reply. I now disassembeld that part and cleared the connectors. Used a mutlimeter to look if any contact is broken, but nothing. So i put it all back together. I hope it's a logic baord failure and somebody could tell me in wich area i should look for damaged parts. But as said i am not going to wholly take apart the screen.

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@saeniv - Have you checked the return lines? If they all show the correct resistance then the driver chip needs to be checked. Sometimes its just a cold solder joint sometimes its the chip its self.

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