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    #1

    asus n550jv no post

    Hi everyone.
    This laptop arrived to me from a friend. modell number: "n550jv-cm131H"

    Laptop starts as soon as AC adapter plugged in. Power and num lock led lights up but no post. If i hold the power button for 8 seconds then it turns off for a second then is starts again. All fans are spinning. CPU and GPU chip is heating up slowly.


    Sequence voltages are all present and semms correct.
    1 +3VA - 3,3v
    +5VA - 5,13v
    2 PS_ON - 3,3v
    3 +3VA_EC - 3,3v
    4 EC_RST - 3,27vb
    5 3VA_DSW_ON - 3,3vb
    6 3VA_DSW_PWGD - 3,36v
    7 DPWROK_EC - 3,3vb
    8 ME_AC_PRESENT - 3,3vb
    9 PCH_SLPSUS# - 3,39v
    10 5VSUS_ON - 3,3v
    11 3VSUS_ON - 3,3v
    12 5VSUS_PWRGD - 3,4vb
    13 +3VSUS_PWRGD - 3,35vb
    14 PM_RSMRST# -3,3v
    15 PCH_SUSACK# - 3,3vb
    16 ME_SuspwrDnAck - 3,39v
    17 PWR_SW# - 3,27v
    18 PM_PWRBTN# - 3,3v
    19 PM_SUSC# - 3,39vb
    20 PM_SUSB# - 3,39v
    21 SLP_A# - 3,4vb
    22 SUSC_EC# - 3,29v
    23 SUSB_EC# - 3,3v
    24 1.35V_PWRGD - 3,18vb
    25 +1.05VS_PWRGD - 3,4vb
    26 P_1.5VS_PWRGD - 3,4vb
    27 ALL_SYSTEM_PWRGD - 3,39v
    28 VRM_PWRGD - 3,4vb
    29 PM_PWROK - 3,3v
    30 H_DRAM_PWRGD -3,39 vb
    31 DRAMPWROK - 0,87 vb
    32 H_CPUPWRGD - 1,05 vb
    33 PM_SYSPWROK - 3,3v
    34 BUF_PLT_RST# - 3,39v
    35 NVDD - 0.9V

    What are not present:
    -- +3VS_LCD - 0v
    -- L_VDDEN_PCH - 0v

    Are these symptoms indicate BIOS issue or PCH?
    Last edited by questore; 03-22-2021, 04:46 AM.
    Tags: None
    #2
    Re: asus n550jv no post

    Everything seems alright. +3VS_LCD will come only when mb posts-so no problem is likely to be there. The clue is when you shutdown, it restarts. So you should carefully look on your dc-dc conversion. The enable for dc-dc conversion is perhaps not removed when you shutdown. May be a bios issue but i think dc-dc conversion ic is faulty. Try replacing them one by one. there may be 2 such conversion circuit. I've not seen the boardview but rather replaying on your symptoms.

    Comment

      #3
      Re: asus n550jv no post

      In case of no POST, no physical damage and no visual hint, BIOS should be flashed first to avoid wasting time and risking damaging the board for no reason.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

        #4
        Re: asus n550jv no post

        Originally posted by mcplslg123 View Post
        Everything seems alright. +3VS_LCD will come only when mb posts-so no problem is likely to be there. The clue is when you shutdown, it restarts. So you should carefully look on your dc-dc conversion. The enable for dc-dc conversion is perhaps not removed when you shutdown. May be a bios issue but i think dc-dc conversion ic is faulty. Try replacing them one by one. there may be 2 such conversion circuit. I've not seen the boardview but rather replaying on your symptoms.
        Boardview attached https://www.badcaps.net/forum/attach...1&d=1616437175

        Witch ic are you refering to?
        Attached Files

        Comment

          #5
          Re: asus n550jv no post

          Perhaps PQ9111. Check Pin3 voltage in off condition, when turned on, when you shut down.

          Comment

            #6
            Re: asus n550jv no post

            Originally posted by mcplslg123 View Post
            Perhaps PQ9111. Check Pin3 voltage in off condition, when turned on, when you shut down.
            the following pins are NOT dropping when holding power button for 8 sec:
            1 - +3VA- 3.3v
            2 - +3VA - 3.3v
            3 - P_+3VA_EC_ON1_10 - 3,3v
            4 - P_22966_VBIAS_10 - 3,3v
            12 - P_+3VA_EC_CT1_10 - 6v
            13 - P_+3VA_EC_VOUT1_10 - 3,3v
            14 - P_+3VA_EC_VOUT1_10 - 3,3v
            Last edited by questore; 03-23-2021, 02:38 AM.

            Comment

              #7
              Re: asus n550jv no post

              Originally posted by piernov View Post
              In case of no POST, no physical damage and no visual hint, BIOS should be flashed first to avoid wasting time and risking damaging the board for no reason.
              Meantime I have flashed with a known good BIOS and result is the same.

              Comment

                #8
                Re: asus n550jv no post

                Originally posted by questore View Post
                Meantime I have flashed with a known good BIOS and result is the same.
                Is that bios from badcaps,can you post a link to it,and post your bios backup and a picture of the green sticker on the RAM slot in the bios requests section - https://www.badcaps.net/forum/forumdisplay.php?f=40
                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                Comment

                  #9
                  Re: asus n550jv no post

                  Originally posted by SMDFlea View Post
                  Is that bios from badcaps,can you post a link to it,and post your bios backup and a picture of the green sticker on the RAM slot in the bios requests section - https://www.badcaps.net/forum/forumdisplay.php?f=40
                  https://www.badcaps.net/forum/showthread.php?t=94242
                  Last edited by SMDFlea; 03-23-2021, 09:09 AM.

                  Comment

                    #10
                    Re: asus n550jv no post

                    Originally posted by questore View Post
                    https://www.badcaps.net/forum/showthread.php?t=94242
                    New BIOS flash not help either.

                    Originally posted by mcplslg123 View Post
                    Perhaps PQ9111. Check Pin3 voltage in off condition, when turned on, when you shut down.
                    the following pins are NOT dropping when holding power button for 8 sec:
                    1 - +3VA- 3.3v
                    2 - +3VA - 3.3v
                    3 - P_+3VA_EC_ON1_10 - 3,3v
                    4 - P_22966_VBIAS_10 - 3,3v
                    12 - P_+3VA_EC_CT1_10 - 6v
                    13 - P_+3VA_EC_VOUT1_10 - 3,3v
                    14 - P_+3VA_EC_VOUT1_10 - 3,3v

                    What is the conclusion?

                    Comment

                      #11
                      Re: asus n550jv no post

                      Plug the battery in,then the charger ,it shouldn`t auto start.Add some extra ram as well and see if theres any change. If not i suspect the EC or onboard ram is bad .
                      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                      Comment

                        #12
                        Re: asus n550jv no post

                        Originally posted by SMDFlea View Post
                        Plug the battery in,then the charger ,it shouldn`t auto start.Add some extra ram as well and see if theres any change. If not i suspect the EC or onboard ram is bad .
                        - Have no battery (long time since it given up)
                        - tried 3 different kind of ram all working in my other laptop
                        - tried different ram slots as well.
                        (this model have no onboard ram)

                        Comment

                          #13
                          Re: asus n550jv no post

                          Though cant say with 100% certainity but seems like EC chip is bad.

                          Comment

                            #14
                            Re: asus n550jv no post

                            Originally posted by mcplslg123 View Post
                            Though cant say with 100% certainity but seems like EC chip is bad.
                            I think I will check if PS_ON drop or not from EC. If not dropping I should replace the EC.
                            If yes then i will replace the PQ9111
                            Also checking Q5767 if its is stuck and having PS_ON 3v cause of that.
                            Let me know if Im thinking wrong.
                            Last edited by questore; 03-25-2021, 06:14 AM.

                            Comment

                              #15
                              Re: asus n550jv no post

                              Connected PS_ON to ground and laptop stopped until it was held to ground. Then started again when released.
                              Any other things I can check before going on blind chip replace and there migth be something else that is causing this?

                              Comment

                                #16
                                Re: asus n550jv no post

                                Ok i have ordered a new chip and a new hot air gun. See.you back in 30 days with the result.

                                Comment

                                  #17
                                  Re: asus n550jv no post

                                  Strange but I found a site where the problem was the same and the solution was to change the PCH chip. Is it possible?
                                  google search for "Asus N550JV (Asus N550JV Rev 2.0) Нет изображения"
                                  Is it possible to test if the PCH or the EC is the problem? (without changing them cause I dont have an infrared BGA station)
                                  Last edited by questore; 03-31-2021, 02:28 AM.

                                  Comment

                                    #18
                                    Re: asus n550jv no post

                                    Replaced EC
                                    Everything ok in sequence but 1.35V_PWRGD is fluctuating.

                                    Comment

                                      #19
                                      Re: asus n550jv no post

                                      Originally posted by questore View Post
                                      Replaced EC
                                      Everything ok in sequence but 1.35V_PWRGD is fluctuating.
                                      After that all sequence are 0v
                                      What now?

                                      Comment

                                        #20
                                        Re: asus n550jv no post

                                        After some searching i found a loose KBC leg. Now laptop kindof starts. But Im back at my original problem.
                                        Every sequence value is normal but no post. CPU and GPU still heating up slowly.
                                        Little differences to the starting problem:
                                        - After AC plugin NO autostart.
                                        - Pressing the power button for 10 seconds laptop starts with Power+numlock LED lit (or sometimes not start and power led blinks once)
                                        - After it started every sequence value is normal except LCD 3v never comming on (no picture)

                                        Any ideas?
                                        Last edited by questore; 06-03-2021, 08:31 AM.

                                        Comment

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