Aggiusta la tua roba Comunità Store

Modello inizio 2011, A1278 / processore i5 2,3 GHz o i7 2,7 GHz

782 Domande Visualizza tutte

Opzioni

How can I re-enable my USB ports due to a power surge?

I had my Mac and Arduino board connected to some motors for a school project when suddenly my Arduino fried up and at the same time my Mac (Macbook Pro-early 2011) turned off. Expecting the worst that my Mac had also fried up, me and my professor managed to get the laptop up and running again smoothly. But as soon as I see a pop-up window saying that my USB ports are disabled due to a power surge or the device is using too much power (I am paraphrasing here) I have been stuck for almost a week on how to fix it.

I have done the SMC resets, opened up the Mac to see if I can see or smell any burned parts on the I/O ports on the mother board, and search for other ways to FIX the problem....not find an alternative on buying an external USB hub like an AmazonBasic USB hub with a power adapter. I found out that it does work when I borrowed my professors USB hub.

Though if I have to pay money out of my pocket and buy a USB hub then I will. Though I would appreciate it if you can help me out on trying to fix it instead. Please and thank you in advance.

Rispondi a questa domanda Anch'io ho questo problema

Questa è una buona domanda?

Sì No
Punteggio 1
Aggiungi un commento

2 Risposte

Filtra per:
Più utili Più recenti Più Vecchio
Risposta Più Utile

Opzioni

If the USB port works by using the powered USB hub to connect your USB devices that implies the ports fuse links are blown. Each port has a small fuse link for the power side of the USB port to protect the system on the logic board.

I think using the external USB hub will be the cheaper solution here. Besides, if you encounter the problem again you can't make things worse ;-}

Questa risposta è stata utile?

Sì No
Punteggio 4

2 Commenti:

Yeah most likely I will go that route. I mean I already know it works, but only on one USB port. But just out of curiosity would you have to get a whole new mother board to fix the issue or could a good soldering job would fix it as well?

da

You'll need to get the needed fuse link part and have the needed micro soldering skills & tools to replace it on the bad port. Are you up to the task? If not it's not an expensive fix if you can get your system to someone skilled.

da

Aggiungi un commento

Opzioni

The original USB 1.0 spec (and the updated 1.1) allowed devices to draw up to 500mA from the port. USB operates at 5V, so that means a maximum of 2.5 watts.

USB 2.0 has the same power limit. But later there were add-ons to the spec for battery charging, allowing up to 1.5A (7.5W) while data transfer is going on, and up to 5A if not. Few USB 2.0 devices can deliver that much power. Also note that the Micro USB connector is only rated to carry 2.1A (10.5W), so that’s the maximum charge rate for a phone that uses 5V charging.

Questa risposta è stata utile?

Sì No
Punteggio 0
Aggiungi un commento

Aggiungi la tua risposta

wiskyBOY123 sarà eternamente grato.
Visualizza Statistiche:

Ultime 24 Ore: 0

Ultimi 7 Giorni: 2

Ultimi 30 Giorni: 14

Tutti i Tempi: 7,676