Thread

Recover dead USB port?

68kMLA Hardware 3 posts Jul 10, 2013 to Sep 13, 2013

#1 Wed, 10 Jul 2013 - 22:16 Recover dead USB port? — #1

One of the ports on my recently purchased PowerBook is dead. It is the 2nd to last AlBook G4 12" with the 1.5GHz processor. I was wondering if there were any troubleshooting steps I should try before looking into a logic board replacement?

#2 Thu, 12 Sep 2013 - 06:10 Recover dead USB port? — #2

Usually there's a fuse for each USB port, maybe check those? If not probably a short circuit that burnt the controller, logic board replacement would probably be the best route if it's not the fuses

#3 Fri, 13 Sep 2013 - 05:27 Recover dead USB port? — #3

Each USB port has a dedicated constant-current IC, that is SMBus controlled, etc.. switches on and off the power to USB port, and monitors current draw from the port. its a little 8 pin IC, ive seen them in both TSSOP and SOIC packages. These are accessed by the power management unit.

its probably bad.