![]() ![]() However, if it is the controller chip that is at fault – this is catastrophic. When one is not working, it can often be as simple to fix as replacing that specific port. These ports are modular: not soldered to the board. The left side USB port is a part of the logic board, so if there is an issue with that port, one must investigate a board level issue same as on the older Macbook Pros. Like with the air, the USB board can fail if you plug in a broken device, the cable dies if you get liquid on it. Most Retina Macbook Pros besides the A1425 2012 13″ model have a right side I/O board – this board can be non-functioning, or the cable that attaches it to the motherboard. ![]() ![]() □ Most of the time you are dealing with an issue around the power delivery system. In rare cases it can be a dead MCP(the modern version of northbridge or southbridge) or PCH(platform controller hub, the modern MCP), at which point you are in for an unpleasant repair. It can be an issue with the USB power delivery chip, or a USB hub chip – see below for examples. For Unibody Macbook Pros from 2008-2012, if a USB port is not working, it is typically a logic board issue – the ports are directly on the board.
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