A1502 820-3476 no display on mini display port

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  • vincelx
    New Member
    • Mar 2020
    • 7
    • Portugal

    #1

    A1502 820-3476 no display on mini display port

    This board works fine with internal display, but nothing on the MDP.

    The measures below are with an external display connected to MDP A

    PPBUS_G3H =12.6V

    TBT_A_HV_EN =0V
    PP15V_TBT=0V
    TBT_A_HPD =3.3V
    PP3V3_S4_TBTAPWR =3.3V
    PP3V3RHV_S4_TBTAPWR_F=3.3V

    On U2800:
    PP1V05_TBTRDV = 1.01V
    PP1V05_TBT = 1.01V
    P1V05TBT_SW = 0.95V
    PP1V05_TBTCIO = 1.00V
    PP3V3_S4_TBT = 3.3V
    PP3V3_S4_TBT_F = 3.3V
    PP3V3_TBTLC = 3.3V
    PP3V3_TBTRDV = 3.3V

    I checked all the above points also on a good board, same model, with the same external display on MDP A and blinking folder, and the values are the same.

    I flashed the content of U2890 with the content of a good board, same model, and still no way to see something on the MDP.

    Replacing U2800 would be the last move? It seems worthless. I have no more idea what could be checked now.


  • mon2
    Badcaps Legend
    • Dec 2019
    • 14023
    • Canada

    #2
    Each of these measurements look lower than usual:

    (check against the good board)

    TBT_A_HV_EN =0V
    PP15V_TBT=0V

    On U2800:
    PP1V05_TBTRDV = 1.01V
    PP1V05_TBT = 1.01V
    P1V05TBT_SW = 0.95V
    PP1V05_TBTCIO = 1.00V

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 14023
      • Canada

      #3
      Confirm each cap in the SNK0 AC Coupling and SNK1 AC Coupling group is present.

      Comment

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