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{A1706 / EMC 3071} – sorti en juin 2017, ce MacBook Pro 13" présente le processeur Kaby Lake jusqu'à 3,5 GHz avec Turbo Boost jusqu'à 4,5 GHz.

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USB-C port works only one way

Hi,

I discovered that my USB-C port on the bottom right-hand side doesn’t work properly.

It works only from one side, meaning that if it doesn’t work I have to unplug the cable turn it around and plug it back again in order to work.

I’ve already reset NVRAM and SMC and I also replaced both ports on the right hand side, still didn’t solve my issue.

Does this mean that my logic board is faulty? The connector itself looks OK to me.

How can I check if it’s the connector? Do you have any ideas what I could try to repair this?

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Best regards

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2 solutions

I’m not sure your issue is within the systems logic board.

The USB-C cable you are trying to use may not be fully wired. I have seen a few cheap single sided wired cables so a bad connection within the socket (or a socket which is not fully wired) can react so the cable doesn’t work in one orientation (same socket flipped over). If this is your issue then the socket assembly will need to be replaced and you got a cheap cable too!

Apple’s Thunderbolt ports are fully wired top and bottom. So a single sided wired cable should work! But there’s still the question is the cable good and technically a USB-C cable is not the same as a Thunderbolt cable! And to add more insult here, the cable may not be configured with correct gage wire so power is not able to travel thru the cable or at a reduced rate.

So make sure you get a good cable and the correct one for the expected task.

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Thanks for your response.

I tested the port with the original apple cable and also with some usb-c hubs from Dell. So I'm pretty certain it's not a cable issue.

Do you mean this part with socket assembly ?

MacBook Pro Retina (A1706 & A1707 Late 2016-2017) USB-C Board

I already replaced it, but to be honest, with a cheap chinese knock-off. But it seems to me that it is highly improbable that it has the same issue as the original one. That's why i think it must be the logic board.

Is there a way to measure this? wich pin of the connector should I connect to some ohter point of the logic board with a multimeter?

par

Lets get a set of pics of the logic board connector and the cable connector of the original USB-C port board, not the cheap one ;-}

Please get a nice tight shot in focus which we can see the pins of the connector. You might find using a tripod or something to rest agains will help with good lighting.

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Hi Hans,

I met with the same issue with you. The Type C port of my MacBook 12’’ 2017 (which only has one Type C port on the left) experienced short circuit due to fluid. Then it could only worked one way just like yours. I went to Apple Store and they replaced the Type C port twice for me, and the problem could not be solved. The technical staff considered that this was the issue of the logic board (though he told me that my logic board looked okay with no obvious problem in appearance). They did not take further action (as my warranty has expired).

I also wonder how this was caused and how it could be addressed without replacing the whole logic board.

Best regards

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@aliceli - There really is only two parts involved here the MacBook 12" Retina (Early 2016-2017) USB-C Port Assembly or the logic board. If replacing the port cable didn't solved the problem then the logic board is all there is.

But! Before you look for an internal issue better than 50% or the time the issue is the external USB-C cable and the device (charger or hub) that's connected to your system.

par

Thank you Dan for the kindest help! I think the problem can be located to the logic board now, as the cable, the charger and the assembly all had been replaced. I really wonder how this is caused and what happened to the logic board..

par

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Hans grüneberger sera éternellement reconnaissant.
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