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Macbook Air Early 2015, keep getting USB power warnings
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Senior User
Join Date: Jul 2020
Status:
Offline
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I was given a 2015 Macbook Air that didn't work, battery was wonked, charger dead. New charger, new battery, runs great, but I CONSTANTLY get "usb accessories disabled, unplug the acc using too much power to renable USB devices", which, is great, but there is nothing plugged into the laptop, so none of the USB ports work.
Ideas?
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Administrator  Join Date: Jun 2000
Location: California
Status:
Offline
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Some internal components are on the USB. Keyboard, trackpad, camera, perhaps even the microphone. Have any of those stopped working?
Check your USB tree in System Profiler, see if it can narrow down which buss is down, and what all is on it.
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Senior User
Join Date: Jul 2020
Status:
Offline
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Keyboard, trackpad, camera, mic all work fine.
System Info says :
USB 3.0 Bus
Internal memory card reader
Current available 900mA
current required 896mA
BRCM20792 Hub
Current available 500
current required 94
Seems to all be working okay, just getting this pop up all the time.
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Clinically Insane
Join Date: Nov 1999
Location: 888500128, C3, 2nd soft.
Status:
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Originally Posted by MacNNFamous 
Internal memory card reader
Current available 900mA
current required 896mA
Uh, there is no way this is going to be performing any read/write whatsoever on 4 mA overhead.
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Administrator Join Date: Jun 2000
Location: California
Status:
Offline
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Another thought. Use a light and magnifying glass on your USB ports. See if there's any foreign substance shorting across two traces. Might be worth examining the logic board too, for liquid stains around the USB ports. Something with enough carbon content to conduct some milliamps.
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Administrator Join Date: Apr 2001
Location: San Antonio TX USA
Status:
Offline
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A dry toothbrush can get into USB ports pretty well. Even if you don’t see anything there, scrubbing at the ports isn’t a bad idea. Dust and hair (not just pet hair) accumulate in odd places like exposed ports.
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Glenn -----OTR/L, MOT, Tx
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Senior User
Join Date: Jul 2020
Status:
Offline
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I gave up, and traded it in on a new Macbook Air with the M1. They gave me $200 for it. Not bad really, I think it was from 2015.
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