MacBook won't turn on - transiently worked after replacing I/O cable

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Retina MacBook 2015

Repair information and guides for the 2015 Retina MacBook Air. Model A1534

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Shan Siddiqi @shan564

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发帖于: 2018年10月12日

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MacBook won't turn on - transiently worked after replacing I/O cable

Bit of background - my wife’s Macbook A1534 had a broken screen and chassis due to physical damage. I bought a comparable model with a dead logic board on eBay, and I transplanted her logic board into the new one. Everything worked fine for a few weeks, until she was recently unable to turn it on after letting the battery die. There is no power, nothing. I tried resetting SMC and PRAM to no avail.

So I decided to pop it open again and replaced the I/O board flex cable and tried plugging it in before I reconnected the keyboard and reassembled everything. Surprisingly, it turned on again! But the keyboard wasn’t plugged in, so I couldn’t turn it back off… so I let the battery die again, and reconnected the keyboard and reassembled everything. This time, I couldn’t get it to turn on. I spent a bunch of time troubleshooting… tried removing and re-inserting the I/O board cable, replaced the I/O board itself (i.e. the USB-C/charging port), punching in every combination of “reset” keys I could find online, disconnecting/reconnecting the battery, etc. Nothing works.

I initially thought the logic board was bad, but I don’t know how I got it to briefly work. Any thoughts?

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You should all try this... https://youtu.be/6OBRm_m4AZc

由 Alvaro Carpio 完成的 2021年8月11日

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arbaman @arbaman

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This Macbook is a beautiful machine but it’s quite troublesome when it comes to repairs. There’s a small button on the logic board that has to be pressed until the led goes off, before anything else, to discharge residual power from the board..did you do that ? After reassembly the 2015 model cannot be simply plugged in with its Usb-C adapter, but first it needs to be charged for a while with a lower voltage adapter, such as an iPhone or iPad charger, otherwise the logic board might take some damage. Was that done ? If answer is no to either question, that might explain the problem you’re facing right now.

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Thanks! I tried pressing the small button, but there was no LED. I went back and did it again, except that I held it down for 3 cycles of 10 seconds (based on what I was reading elsewhere).

I did plug it in with the 29W power adapter, but it worked fine the first time for some reason.

Any suggestions?

由 Shan Siddiqi 完成的 2018年10月13日

Hardware failures cannot be undone unfortunately, you'll need to find a new board or find someone who can fix yours.

由 arbaman 完成的 2018年10月13日

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Thanks! I tried pressing the small button, but there was no LED. I went back and did it again, except that I held it down for 3 cycles of 10 seconds (based on what I was reading elsewhere).

I did plug it in with the 29W power adapter, but it worked fine the first time for some reason.

Any suggestions? — Shan Siddiqi
Hardware failures cannot be undone unfortunately, you'll need to find a new board or find someone who can fix yours. — arbaman

Retina MacBook 2015

MacBook won't turn on - transiently worked after replacing I/O cable

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