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ASUS UX303LN don't start with battery only

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    ASUS UX303LN don't start with battery only

    ASUS UX303LN
    I change ram voltage chip PU8400 because
    there was a short on EC_GPE0 -> SUSB_EC#
    I change EC also and reprogramm bios. After that (I don't know if
    this problem existed even before the repair)
    motherboard start only with
    connected adapter and charge battery , if I remove it after power on
    the system remain on.
    Only with battery the system don't start;
    on PU8100 (this chip provide voltage to charge battery and
    +3V and 5V always voltage)
    there are those voltage on this chip with battery only
    pin 3 -> VREG3 -> 3.3V
    9 -> VBST2 -> 2.5V
    12 -> VIN -> 12.5V
    19 -> VBST1 -> 2.5V
    the EC is not powered because the PS_ON signal is 0V
    It's possible there is a bios issue ?

    thanks
    Attached Files
    Last edited by jasko_jacker; 05-31-2018, 11:55 AM.

    #2
    Re: ASUS UX303LN don't start with battery only

    Can you upload the boardview .
    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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      #3
      Re: ASUS UX303LN don't start with battery only

      Originally posted by SMDFlea View Post
      Can you upload the boardview .
      motherboard ver 2
      Attached Files

      Comment


        #4
        Re: ASUS UX303LN don't start with battery only

        Voltage at pin 4&5 of J6004?

        PR6001 and PR6002 are OK?

        PD6001 is also good?

        There are pulses in SMB0_DAT_CLK_CON and SMB0_DAT_BAT_CON?

        Comment


          #5
          Re: ASUS UX303LN don't start with battery only

          Sir SMDFlea send me Bios Main and Ec please working

          Comment


            #6
            Re: ASUS UX303LN don't start with battery only

            Have a look at PU9100 . 3VA , 3VA_ECO
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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              #7
              Re: ASUS UX303LN don't start with battery only

              Originally posted by newfoxinformatica View Post
              Sir SMDFlea send me Bios Main and Ec please working
              I don`t have it.
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

              Comment


                #8
                Re: ASUS UX303LN don't start with battery only

                "on PU8100 (this chip provide voltage to charge battery and
                +3V and 5V always voltage)"

                Check PU8800 it provides voltage to charge the battery,and power management.

                https://cdn.badcaps-static.com/pdfs/...efe8ea3bff.pdf (read the pin description, pin 11)

                I read on notebook1 and ******* about the same problem as you`re having, in some cases only a new battery fixed it.
                Last edited by SMDFlea; 06-01-2018, 11:31 AM. Reason: added more info
                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment


                  #9
                  Re: ASUS UX303LN don't start with battery only

                  ESD protection diode is ok
                  res 6001 and 6002 ok
                  DC ONLY AC+batt
                  pin 5 -> SMB0_DAT_BAT_CON -> 0v -> 3.3 V
                  pin 4 -> SMB0_DAT_CLK_CON -> 0v -> 3.3 V

                  It's strange in the model with non removable main battery but after I change the rtc batt (totally down) the system start with battery only:

                  DC ONLY AC+batt
                  pin 5 -> SMB0_DAT_BAT_CON -> 3.3v -> 3.3 V
                  pin 4 -> SMB0_DAT_CLK_CON -> 3.3v -> 3.3 V

                  regarding the request of the bios, I attach a definitely working dump.
                  The ec does not require to be programmed.
                  Attached Files

                  Comment


                    #10
                    Re: ASUS UX303LN don't start with battery only

                    The RTC battery goes to DSWODVREN ,its for PCH deep sleep.
                    Attached Files
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment


                      #11
                      Re: ASUS UX303LN don't start with battery only

                      @SMDFlea, what is is the significance of DSWODVREN signal? I have this same board with a dead RTC batt that I'm troubleshooting now. Should the board be able to boot without the RTC battery when using AC adapter?

                      Comment


                        #12
                        Re: ASUS UX303LN don't start with battery only

                        DSWODVREN signal=Deep Sleep Well Internal Voltage Regulator Enable: This signal enables the internal Deep Sleep 1.1 V regulators.

                        As far as your 2nd question-yes it will work without rtc battery installed.

                        Comment


                          #13
                          Re: ASUS UX303LN don't start with battery only

                          thanks

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