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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB GDDR5 Video RAM

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USB 2.0 devices not working! HELP!

Hey folks.

My mid-2012 MBP’s USB 3.0 ports are not working for any of my 2.0 devices. Both ports work with my 3.0 external HD though. I’ve done an SMC and PRAM reset multiple times already. Apple Hardware Test came back all clear.

Of the 2.0 devices that I’ve tried, the ones with power LED’s appear to be getting power from the ports as the LEDs are lighting. However, they cannot send or receive data.

The pins don’t appear broken or damaged in any way, although they could probably stand to be cleaned a little.

Any advice would be greatly appreciated!

Beantwoord deze vraag Dit probleem heb ik ook

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What OS X are you using? Did you lose function when you last upgraded your system?

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10.14 Mojave. It’s been happening through a couple OS upgrades, so I don’t believe so.

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I would check the USB power using a meter like this one: USB Mini Voltmeter

USB Mini Voltmeter Afbeelding

Product

USB Mini Voltmeter

$9.99

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Okay, so I did that. As I suspected, I'm getting the expected 5.0 V when plugged in no matter what device is plugged in with it. But no current for any device other than my external HD's.

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More often than not the USB power lines go. It sounds like your data lines are severed or the PCH chip is gone.

I think you're going to need to do a deep inspection of the data lines tracing them out from the ports to the PCH. Do you see some corrosion or any of the filter caps damaged? This maybe beyond your skill set and you'll need to get a set of schematics and boardview drawings to work it out.

The other direction is just replace the logic board MacBook Pro 15" Unibody Mid 2012 Logic Board Replacement

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I'm a undergrad CE student, but early along. Although, tracing data lines from schematics and a .brd should be manageable and good practice.

Just have to find the schematic and the .brd.

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Kyle Zerner zal eeuwig dankbaar zijn.
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