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Lenovo Z580 USB doesn't work

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    #1

    Lenovo Z580 USB doesn't work

    USB2.0 / USB3.0 ports are not working, user has reversed voltage with ardunio 12v.
    Motherboard DALZ3AMB8E0 Quanta LZ3, REV: E
    The U23 did not have an output voltage of 5v, and there was no 3.3v on the 4th pin (OC).
    There were 2-3 pins + 5V_S5, the 4th pin had 3.3v enable.
    Result: U23 changed output 5v came, 3.3v OC pin ok but USB port still not working. HM chipset has been changed but USB still does not work.
    Is there anyone who can help?
    Tags: None
    #2
    Re: Lenovo Z580 USB doesn't work

    Check U17/U28/U42/U47. Measure resistance on D+ and D- on usb port.

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      #3
      Re: Lenovo Z580 USB doesn't work

      Originally posted by mcplslg123 View Post
      Check U17/U28/U42/U47. Measure resistance on D+ and D- on usb port.
      all of this is ok
      -I actually solved the problem.
      -the problem was in windows 8.1
      -I installed windows on a different hard disk, I saw that the problem was solved.
      -No matter how hard I tried, I couldn't fix the problem in windows 8.1.
      Although I turned it off by pressing -Shift
      Operating system is not UEFI
      Anyway thank you so much
      Processes: U23 changed, PCH changed, Operating system was reinstalled as Windows10.
      Last edited by simabilisim; 05-23-2020, 01:55 PM.

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        #4
        Re: Lenovo Z580 USB doesn't work

        In bios you have an option "OS optimize settings" or something like that. When it's disabled USB will work in compatibility with W7, when enabled will not work with W7, and probably from here you have problems in W8

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          #5
          Re: Lenovo Z580 USB doesn't work

          hi
          pls name code U17/U28/U42/U47 Measure resistance

          Originally posted by mcplslg123 View Post
          Check U17/U28/U42/U47.
          Measure resistance on D+ and D- on usb port.

          Comment

            #6
            Re: Lenovo Z580 USB doesn't work

            Review page 28 of the Lenovo schematics. There you will find the USB 2.0 & 3.0 port schematic.

            Remove all power. Meter in resistance mode (2k scale).

            Measure & post the resistance to ground of each D+ / D- pin of the USB connector.

            Also recommend, remove all power, meter in DIODE mode.

            Red meter probe (yes, RED) to GROUND.

            Black meter probe to D+ to measure. Post the reading.

            Then repeat for D- pin in DIODE mode setting. Post the reading.

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