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X550jx black screen but cpu heating up

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    #41
    Re: X550jx black screen but cpu heating up

    Originally posted by stingerchamp View Post
    Check crystal oscillator

    If you have DSO or oscilloscope check 32khz clock available or not and keep it checking for 10sec

    Make sure voltage on rtc cell 3 voltage

    If you have xtal clock for PCH check xtalin and out for 14mhz clock available or not
    Waiting for oscillator... Be back when i have it

    Comment


      #42
      Re: X550jx black screen but cpu heating up

      You have board view

      Check this signal suspwrdnack is connected to which capacitor or which nodes
      Take snapshot and post

      Comment


        #43
        Re: X550jx black screen but cpu heating up

        Originally posted by stingerchamp View Post
        You have board view

        Check this signal suspwrdnack is connected to which capacitor or which nodes
        Take snapshot and post
        in this board suspwrdnack is actualy just connect KBC to PCH nothing fancy.

        suspwrdnack also connects to +3VSUS_ORG (measured 3v) and connected through a 10kOhm resistor.

        Comment


          #44
          Re: X550jx black screen but cpu heating up

          Check resistance value of 10 kilo ohm resistor
          In ohm range

          Comment


            #45
            Re: X550jx black screen but cpu heating up

            Originally posted by stingerchamp View Post
            Check resistance value of 10 kilo ohm resistor
            In ohm range
            Checked and its 10KOhm exactly

            Comment


              #46
              Re: X550jx black screen but cpu heating up

              Hmm interesting

              At step 15 rsmrst# when goes up 3.3v pch_susack# goes up at step 16 and at step 17
              suspowerdnack goes up after 200msec delay so

              First check PCH_susack# goes up and it is constant
              For few seconds or drops

              Second if it drops we found the problem

              This resistor is connected to which parts means one side and other side


              Replace q3002 transistor
              and if you find nothing changed ,

              Otherwise , difficult but not recommend as last option

              Solution1: use a jumper wire and attach one end where PCH susack# and connect other to suspwrdnack

              Solution2

              Jump wire from
              +3VSUS_ORG to suspowerdnack

              If we had complete schematic diagram it could help

              Our goal is to provide 3.3 volt at suspwrdnack to check if it works or not
              Flashing a good bios also an option with clean me region

              Comment


                #47
                Re: X550jx black screen but cpu heating up

                Hold your thoughts I have to check something...

                Comment


                  #48
                  Re: X550jx black screen but cpu heating up

                  Q3002 does not exist,
                  "ME SUSPWRDNACK" and "ME SUSPWRDNACK EC" is just connected trough R3071 and its a 0 Ohm resistor.

                  I will check what you suggested and get back.

                  Comment


                    #49
                    Re: X550jx black screen but cpu heating up

                    Found a Schematic that is not exactly for this modell but whatever I looked up on this was good and correct for my modell too:
                    Attached Files

                    Comment


                      #50
                      Re: X550jx black screen but cpu heating up

                      Check voltage at r2134 and r2106
                      This schematic diagram has power sequence where at step 6 we have sus_pwrgd and step 7 is suspowerdnack
                      and step 8 is after 200ms pm_rsmrst#

                      These signals are powered by 1.8vs

                      I am sure if all other signals are present

                      This is absent due to one of q3001a or b is working in abnormal condition



                      Check q3001a mosfet and q3001b it is a dual mosfet 6 pin

                      N channel so require high voltage in this case 3.3 to turn on and one will work at a time

                      Check voltage on pin 2 , 3 ,6 ,5

                      Comment


                        #51
                        Re: X550jx black screen but cpu heating up

                        Originally posted by stingerchamp View Post
                        Check voltage at r2134 and r2106
                        This schematic diagram has power sequence where at step 6 we have sus_pwrgd and step 7 is suspowerdnack
                        and step 8 is after 200ms pm_rsmrst#

                        These signals are powered by 1.8vs

                        I am sure if all other signals are present

                        This is absent due to one of q3001a or b is working in abnormal condition



                        Check q3001a mosfet and q3001b it is a dual mosfet 6 pin

                        N channel so require high voltage in this case 3.3 to turn on and one will work at a time

                        Check voltage on pin 2 , 3 ,6 ,5
                        Sorry if i misslead you, but my previous statement is good:
                        "ME SUSPWRDNACK" and "ME SUSPWRDNACK EC" is just connected trough R3071 and its a 0 Ohm resistor. Q3001a and Q3001b in this board is not present but jumpwired directly

                        But you gave me an idea:
                        previously I have checked PCH_SUSACK# is 3.3v constant so EC give this signal out but I did NOT checked the other side of the R2232 resistor that is going to PCH. I check if I'm home.
                        Last edited by questore; 12-22-2020, 05:00 AM.

                        Comment


                          #52
                          Re: X550jx black screen but cpu heating up

                          - PCH_susack# 3.3v from start and constant
                          - ME SUSPWRDNACK goes up to 3.3v then it drops to 0v and stays that way.
                          (no short on any of them)
                          What does this mean?
                          Last edited by questore; 12-22-2020, 01:19 PM.

                          Comment


                            #53
                            Re: X550jx black screen but cpu heating up

                            ME_SusPwrDnAck should remain 3.3 high as per sequence , should never drop down

                            What is connected to other side of r2232

                            Which schematic is correct ,this new you attached or posted in previous page

                            Q3002 is important as per diagram

                            Comment


                              #54
                              Re: X550jx black screen but cpu heating up

                              PCH_SUSACK# is connected to PM_SUSACK through R2232

                              Unfortunatelly nor the schematic nor the Boardview is perfect for this model.
                              This is a minimalistic board and most of the components are missing and just connected trough direct 0Ohm resistors.

                              I'll try to make a good picture with high quality to make you a good baseline of this board.

                              I have no idea why ME_SusPwrDnAck goes down after 3.3v it does not makes sense to me. Its directly goes to KBC chip.
                              I have checked and its 0Ohm all the way through from chip to chip. No short to ground.

                              Comment


                                #55
                                Re: X550jx black screen but cpu heating up

                                Q3002 missing and jumpered trough 0 Ohm resistor R3071 see picture1: SUSPWRDNACK_pic.jpg (516.9 KB).
                                R3071 pins
                                1 ME_SUSPWRDNACK
                                2 ME_SUSPWRDNACK_EC

                                Made picture of PCH_Susack area balow PCH to make you see how minimalistic this board is PCH_pic.jpg (533.0 KB)
                                Attached Files
                                Last edited by questore; 12-23-2020, 03:17 AM.

                                Comment


                                  #56
                                  Re: X550jx black screen but cpu heating up

                                  Check at previous step

                                  3vsus, 5vsus constant or dropping for 10sec

                                  If drops we are getting close to fault
                                  Last edited by stingerchamp; 12-23-2020, 03:17 AM. Reason: Thinking more

                                  Comment


                                    #57
                                    Re: X550jx black screen but cpu heating up

                                    +3VSUS is steady 3V
                                    +5VSUS is steady 5V
                                    +12VSUS is steady 13V

                                    Comment


                                      #58
                                      Re: X550jx black screen but cpu heating up

                                      When it goes down again tweezers create connection between suspwrdnack and pch_susack and check but carefully

                                      We are providing 3.3 signal to pch to retain sus

                                      Comment


                                        #59
                                        Re: X550jx black screen but cpu heating up

                                        If it turns on then I have a bad PCH? Just asking ...

                                        Comment


                                          #60
                                          Re: X550jx black screen but cpu heating up

                                          Not exactly sure but another solution is put pq3002 and provide power there as per sequence

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