ASUS E410MA no 5v/3v on board.

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  • someonenotyou
    Senior Member
    • Feb 2021
    • 59
    • LV
    #1

    ASUS E410MA no 5v/3v on board.

    Hi.
    I have a ASUS laptop with board number E410MA, which does not power up.
    By the looks of things, it does not generate 5v, 3v, 1.8v and 1.2v.

    The main power rail is there - 19.5V is present and goes to every IC.

    By measuring various components, I found these readings:

    EC_RST# - 2,7V
    RTEST# - 2,8V
    RTC_RST# - 2,8V

    +VCCRTC_3P3 - 2,85V
    +RTCBAT - 3V

    P_CHG_VDD_20 - 5V
    P_CHG_ACOK_10 - 5V

    From the battery I get 3V at RTCBAT, but 0V on main connectors when connected to the board.

    I have a boardview of the board, but I could not find the schematic, so I am at the loss.
    Where should I start to look?

    Thank you.

    Boardview file - https://www.badcaps.net/filedata/fetch?id=2128752
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14542
      • Canada
      #2
      Which connector is 0v on the board ?

        Comment

        • someonenotyou
          Senior Member
          • Feb 2021
          • 59
          • LV
          #3
          Originally posted by mon2
          Which connector is 0v on the board ?
          BAT_CON does not give any voltage to the board.
          Click image for larger version Name: bat_con.png Views: 36 Size: 191.1 KB ID: 3711108

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14542
              • Canada
              #4
              Share the topside markings of PU8901 = battery charger IC.

                Comment

                • someonenotyou
                  Senior Member
                  • Feb 2021
                  • 59
                  • LV
                  #5
                  Originally posted by mon2
                  Share the topside markings of PU8901 = battery charger IC.
                  The markings are:
                  intersil
                  9238CH
                  W213E3

                    Comment

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