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Apple's 2016 revision to their laptop lineup targeted at professional users. Features a 15-inch, 2880-by-1800 Retina display, quad-core Intel Core i7, 256 GB / 512 GB /1 TB / 2TB storage options, 16 GB RAM, and a keyboard equipped with a Touch Bar. Released November 2016. Features Model A1707.

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2R2 chip heating up when keyboard connected

Hi,

I have a Late 2016 Macbook Pro 15-inch A1707 EMC 3072, i7 2.7GHz that had water spilled on the keyboard. The user turned it off but turned it back on the next day thinking it completely dried up. The computer died shortly after turning on.

When I diagnosed it, I did not find any signs of electrical damages or corrosion, but I noticed a chip located near the bottom right corner of the logic board labeled 2R2 heats up significantly when plugged in to power (external or battery).

I thought the logic board was fried, so I replaced it with a similar model. Testing the new (used) board, the same thing happens. I noticed the same chip heats up only with the keyboard is plugged in to the board, which makes me think the keyboard might be faulty.

What is that chip? Is it the keyboard chip? Is it heating up a sign of a bad keyboard, a bad logic board or both? I have attached pics of one of the boards + the 2R2 chip. I don't have the logic boards diagram and don't know how to read it, but part # is 820-00281-A.

Any help is appreciated.

Thanks

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The 2R2 component is an inductor and part of the power logic. In it’s self it is not the failure it’s the other elements of the logic involved.


As there are a few 2R2 inductors we would need to know which one to narrow things down a bit. Take a picture and mark the one in question, post it here so we can see it.


Did you have a liquid spill or other event that could have started things off? Where did it spill into?

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@rabih44654 since you have already replaced the original water damaged logic board, this issue does appear to originate from a peripheral device. When we see which inductor is heating up we can most likely identify the faulty circuit and hopefully that will help you to get it fixed. The keyboard is definitely a possibility. Adding images to an existing question

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@danj thanks for your reply, Dan. Yes, like I mentioned in my OP, the user spilled water on the keyboard. This was my first post here and I thought I added pics to it. There should be pics now. Let me know if you need more. Thanks!

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@oldturkey03 thanks for your reply and for the link, oldturkey. Didn't know I had to click on the image at the end to add it. I hope the pics are clear. Disconnecting the keyboard means disconnecting the fans too, but I'm positive the computer turns on (with the keyboard disconnected) because the CPU/GPU warms up a bit.

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The component you circled is L7600 in the schematic, and like Dan said in his comment it's part of the power logic. You said you replaced the logic board. With the replacement board installed and everything connected, do you get any signs of life from the system other than a warm L7600 and a warm CPU/GPU? Does the CAPS lock light turn on on the keyboard? Do you hear a chime? Do the fans spin up at all? You should also try the replacement logic board in different install configurations to rule out certain components causing issues—for example, you could try powering on with the display disconnected, or the trackpad disconnected, or the battery disconnected, etc., to see if you get different behavior or if another component could be failing. It's very common with liquid damage for multiple components to be damaged—make sure to check the USB-C boards and their pins for corrosion as well. Good luck!

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Thanks for your comment. I have been testing the Mac, and I have some good news.

In such situations, I always test different install configurations to rule out faulty parts. I did that with the original logic board, but the only signs of life I got was a warm heat sink. Which confused me because I did not hear chime or display. I ran those tests multiple times on the original board and the replacement, no results. I ran the same tests again on the original board (keyboard disconnected), computer somehow came back to life! I'm wondering if the logic board has any internal damages that prevented it from starting before (with keyboard disconnected).

Answering your questions, there are 2 fans and both are connected to the keyboard, which is connected to the logic board. When I reconnect the keyboard, the computer does not start and of course the fans don't either. As for the USB-C boards, those were cleaned when I cleaned the original board 2 weeks ago, no corrosion. Guess I'm replacing the keyboard now!

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@rabih44654 Sounds like the fault lies with the top case / keyboard assembly, so I think you're on the right track. Good luck!

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