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Asus X542UQ no display

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    Asus X542UQ no display

    Hello my friend

    Got this motherboard come to me with some interventions before

    Interventions :

    First mosfet PQ8901 and PQ8901
    PR8938
    PU8001

    i find PQ8901 faulty change it all voltages are ok ( D/S/G )
    Just re solder PU8001

    the lap power on , reach amp 0.450 amp , no display and of course the consumption is not enough .

    All voltages are present except
    +VCCGT ( no pb for this )
    +NVVDD 0v and +FBVDDQO for Graphic card.


    U3001 :

    96= PM_RSMRST# =3v ok
    22 = BUF_PLT_RST# = 3v ok
    68 = ALL_SYSTEM_PWRGD = 3v ok


    PU8001 :
    42 = IMVP8_PWRGD = 3v ok

    PU8600 :
    +2.5V ok
    +VTT ok
    SMB_DATA_S3 and SMB_CK_S3 ok
    1.2V_PWRGD = 3v ok
    BUT DDR4_DRAMRST# = 0.050v

    Flash bios , uma conversion same issue .

    Question about PU8901 , P_CHG_ACOK_10 = 6v ( same as P_CHG_REGN_20 voltage , no voltage divider !! ) i change it with BQ24780S same acok voltage !

    What ivoltages i must verify too !!

    Thank you

    Boardview
    ---> https://www.badcaps.net/forum/showth...42#post1249442
    Last edited by Vesko356; 06-25-2023, 05:11 AM. Reason: Attached schematic removed and replaced with link.

    #2
    Re: Asus X542UQ no display

    P_CHG_ACOK_10 = 6v-This may be ok as REGN is used as pullup for ACOK and there in voltage divider involved.

    R0401 should be checked for DRAMRST#.

    Bios flashed is clean me and known good?

    If yes, then i'm afraid this may be cpu fault.

    PS:Worth checking with another flash drive also.

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