A1706 3 ports work, 1 fails

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  • Proteus2188
    New Member
    • Apr 2022
    • 4
    • Netherlands

    #1

    A1706 3 ports work, 1 fails

    HI All,

    I have this A1706 with a strange issue.
    1 USB port wont work.

    3 others keer working with no issues.
    replaced the ports, but same problem.

    Replaced both CD3215 with known working ones. no result.

    What am i missing?
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14047
    • Canada

    #2
    Re: A1706 3 ports work, 1 fails

    What fails? USB power negotiation of 20v or USB function for data transfers?


    1) review the mechanical fit of the non-working connector. Maybe the contacts are damaged on the USB paddle board?

    2) check the ldo rails on each ACE controller. Compare the voltage ldo rails of working vs. non-working ports.

    3) remove all power. Meter in diode mode. Check the diode mode reading of the USB pins to compare working to non-working.

    Red meter probe to ground (yes red).

    Black meter probe to point to test.

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