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Device only boots with trackpad disconnected. Battery issue?

Hello, I have a mid 2015 Macbook Pro. Recently it shut down mid use. After that it will get to the black apple loading screen and just shut off. When I try booting into recovery mode or diagnostic mode it also shuts down. In diagnostic mode I can select a language, it starts to run, and then powers off quickly before doing much.

My battery is in poor health (2000 cycles, service recommended). I disconnected the battery and attempted to boot but found the same issue. I then learned from the helpful folks here in another thread, that mid 2015 macbook pros are unable to boot without a battery. I also found that if you disconnect the trackpad connector, due to less power being drawn you may be able to get around this.

I disconnected the trackpad connector, plugged the battery in, and was able to successfully boot (albeit with fans at 100% and CPU underclocked as expected). I then unplugged the power cable and the laptop continued to run on battery power.

I'm suspecting I need a new battery, but the fact that it ran on battery power w/ trackpad disconnected makes me suspicious. Does this sound like battery is root cause or some other component?

Thank you for your time

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So while you do need a new battery from what you state. It’s also likely your trackpad needs replacing too MacBook Pro 15" Retina (Mid 2015) Trackpad this series is a bit more susceptible to liquid damage as the circuitry is a bit exposed. I would inspect the trackpad for corrosion damage

So I would dry fit the battery test again and only after you are sure then glue the battery in.

Image MacBook Pro 15" Retina (Mid 2015) Trackpad


MacBook Pro 15" Retina (Mid 2015) Trackpad


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Thanks Dan! I appreciate the response. I did a bit more troubleshooting and found when I plug the trackpad cable in, but remove the Keyboard data cable, the device boots and runs fine. Does this segment the problem to the keyboard?

It's my understanding that the keyboard also runs through the trackpad board, so the initial troubleshooting may have hid the real root cause being the keyboard. I'm a bit surprised the keyboard would cause the system not to boot.

Do you think there could be some other underlying issue here? or is keyboard the new suggestion to replace?

Thanks agian!


@physicsmike - Sounds like your system had a liquid spill or excessive cleaner seeping in which could be as I stated damaged the trackpad and/or the keyboard. Time to replace these parts.


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Mike sera éternellement reconnaissant.
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