Mac Pro front USB 2.5 Volts - Need to Find out voltage for MLB Side 593-0382 Cable

Discussion in 'Mac Pro' started by Electrobumps, Jan 25, 2014.

  1. Electrobumps macrumors newbie

    Jan 25, 2014
    Front USB is down on my mac pro 1.1 I can not get them to see anything.

    USB is reading 2.5v. If I disconnect MLB Side 593-0382 cable. I get zero volts.

    The usb connector close by to the front panel board does not provide any voltage is this correct?

    I have presumed USB power is provided from cable 593-0382

    Does anyone know what voltages should be seen on this 8 pin cable?

    Assuming pin one is top left when you look at it I get the following voltages.

    1 - 12v
    2 - 5v
    3 - 3.3v
    4 - 0.12v
    5 - 0v
    6 - 3.3v
    7 - 3.2v
    8 - 3.2v

    Can anyone verify these voltages are correct? I have just placed a second hand front panel board in and I want to verify if I have another faulty board or if I have a problem elsewhere. FW, 400 and 800 function as expected.

    Any ideas to find the fault would be appreciated.
  2. Electrobumps thread starter macrumors newbie

    Jan 25, 2014
    I switched my old board back in and I get 5v. So I have been sold a faulty board.

    So I believe these voltages are correct if it helps anyone in the future.

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