X556UJ ver.2 laptop mainboard dead

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  • aanev
    Member
    • Feb 2013
    • 20
    • macedonia
    #1

    X556UJ ver.2 laptop mainboard dead

    Hello ,

    I'm trying to repair X556UJ ver.2 laptop mainboard. Board came with damaged USB 3.0 connector that I have desoldered, but board is dead, no led is on.
    I have boardview and some repair guide for version 1.0 and I have 3.3v on power button.
    I have measured some voltages on first regulator and I have +3va, +5va , this is the only heating element and on pin 14 +5VSUS voltage is 0V.
    On battery connector rtc_ldo 3.3v is 2.8v, and on SIO ec_on is 3.3V. On the BIOS leg 8 is giving only 1.0V . PS_ON voltage is OK, but ME_AC_PRESENT is 0.2V
    I have measured all the big coils with ground and the lowest resistance is on +3VADSWO - 1.5ohm and on +1VSUSO - 0.4ohm. Only coil that have voltage is P_CHG_SENSE that is 0.4V.
    No fet seems to be damaged, and there is no change if I press power button, the board is taking only 50mA.
    I have no idea if it is the heating regulator or something else, can you help me ?

    Thanks.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: X556UJ ver.2 laptop mainboard dead

      Sounds like a dead PCH, inject 3V on +3VADSWO, if the PCH heats up, it's dead.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • aanev
          Member
          • Feb 2013
          • 20
          • macedonia
          #3
          Re: X556UJ ver.2 laptop mainboard dead

          Originally posted by piernov
          Sounds like a dead PCH, inject 3V on +3VADSWO, if the PCH heats up, it's dead.
          Before injecting tell me on the regulator chip is it ok 3VADSWO_EN and 5VSUS_EN to have same voltage 3.23V because I think on 5VSUS_EN pin it should be 5V, am I right?
          Here it is the boardview I'm using(only some parts are missing on my version,but position of parts i same)
          https://www.badcaps.net/forum/attach...7&d=1599760269

            Comment

            • aanev
              Member
              • Feb 2013
              • 20
              • macedonia
              #4
              Re: X556UJ ver.2 laptop mainboard dead

              If I desolder PJP8704 then +3VADSWO and +5VSUS get 3.3V and 5V. So probably regulator PU8701 even it heats a little, it gets all the signal and give output. What to do next, any help??

                Comment

                • mcplslg123
                  Badcaps Legend
                  • Jun 2015
                  • 7262
                  • india
                  #5
                  Re: X556UJ ver.2 laptop mainboard dead

                  Post#2, piernov has already answered. Why not inject voltage to find out for yourself. I too think its dead pch. Very often if anything goes wrong in usb on soc platform, the soc gets killed.

                    Comment

                    • aanev
                      Member
                      • Feb 2013
                      • 20
                      • macedonia
                      #6
                      Re: X556UJ ver.2 laptop mainboard dead

                      Originally posted by mcplslg123
                      Post#2, piernov has already answered. Why not inject voltage to find out for yourself. I too think its dead pch. Very often if anything goes wrong in usb on soc platform, the soc gets killed.
                      Ok I injected 3V and the PCH is heating
                      Thanks

                        Comment

                        • aanev
                          Member
                          • Feb 2013
                          • 20
                          • macedonia
                          #7
                          Re: X556UJ ver.2 laptop mainboard dead

                          Because PCH is unchangable is there any way to cut some line that is going to PCH usb 3 regulator and get partly working motherboard without usb ???
                          Also is there some table what different motherboard model is nearly compattible with this chassis ???

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india
                              #8
                              Re: X556UJ ver.2 laptop mainboard dead

                              No, u can't disable some lines make och working. You need to replace the soc

                                Comment

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