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i can´t found +3.3v run

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    i can´t found +3.3v run

    hello guys i need your help with tis problem , i tried yo repair my motherboard
    DAJW8CMB8E1 REV E all voltages are ok 3.3v always , 5v always , bios 3.3 v etc , but 3.3v_run is my problem i don´t know where 3.3_run is generated and ii need it for turn on the motherboard

    please help me with this i leave the schematic any advice will be nice



    Attached Files

    #2
    Re: i can´t found +3.3v run

    Theres no 3.3_run in the schematic.
    Where do you measure for 3.3_run ?

    EDIT: You mean +3.3V_RUN ? Always make sure to post the correct names.
    EDITEDIT:

    +3.3V_RUN derives from +3.3V_ALW and is switched by PQ10.
    Measure voltage on Gate, Source & Drain on PQ10.
    Last edited by KvnTM; 12-03-2019, 10:40 AM.

    Comment


      #3
      Re: i can´t found +3.3v run

      Originally posted by KvnTM View Post
      Theres no 3.3_run in the schematic.
      Where do you measure for 3.3_run ?

      EDIT: You mean +3.3V_RUN ? Always make sure to post the correct names.
      EDITEDIT:

      +3.3V_RUN derives from +3.3V_ALW and is switched by PQ10.
      Measure voltage on Gate, Source & Drain on PQ10.
      thanks for your help but i have in drain +3.3V_ALW but i don't have voltage in gate
      in PU6 i don´t have voltage on pin 1, 2 ,3 , 4 and driver 1 , 2, 3 ,4 on the others pins i do have voltage !!1 i can´t explain why


      sorry my english i´m a beginner form chile
      please help me again

      Comment


        #4
        Re: i can´t found +3.3v run

        You have to test pin 100 123 U23 IC for out put Voltage

        Comment


          #5
          Re: i can´t found +3.3v run

          Originally posted by techtiger View Post
          You have to test pin 100 123 U23 IC for out put Voltage
          already checked and nothing , i press de power button blink the light and turn off
          Last edited by marcelofct; 12-03-2019, 02:51 PM.

          Comment


            #6
            Re: i can´t found +3.3v run

            ok now you have to check SIO (U23) as you prees the power button
            pin 80
            pin 19
            pin 76
            pin 13
            pin 124
            pin 14

            with out pressing pwr button

            PIN3
            PIN 112
            if RSMRST not rising up the fault is in BIOS
            Last edited by Techtiger; 12-04-2019, 03:11 AM.

            Comment


              #7
              Re: i can´t found +3.3v run

              Originally posted by techtiger View Post
              ok now you have to check SIO (U23) as you prees the power button
              pin 80
              pin 19
              pin 76
              pin 13
              pin 124
              pin 14

              with out pressing pwr button

              PIN3
              PIN 112
              if RSMRST not rising up the fault is in BIOS
              pin 80 = 0.0 v
              pin 19 = 0.0 v
              pin 76 = 2.6v when press the pwr button nothing happend
              pin 13 = 0.0 v nothing
              pin 124 = 0.0v nothing
              pin 14 = 3.2 v press pwr button nothing happend same voltage

              with out pressing pwr button

              PIN3 = 3.12v
              PIN 112 = 0v

              in bios i have 3.3v on pin 1 and pin 8

              stay tuned
              Last edited by marcelofct; 12-04-2019, 10:06 AM.

              Comment


                #8
                Re: i can´t found +3.3v run

                Make sure RTC_CELL is crossing R119 R405 and also +3.3V_EC U23 pin 26 75 , there’s no communication between SIO & BIOS chip that’s why the BM dead condition save the old dump and flash bios

                Comment


                  #9
                  Re: i can´t found +3.3v run

                  Originally posted by techtiger View Post
                  Make sure RTC_CELL is crossing R119 R405 and also +3.3V_EC U23 pin 26 75 , there's no communication between SIO & BIOS chip that's why the BM dead condition save the old dump and flash bios
                  what do you mean crossing R119 R405 and pin 26 75 ? i think you mean continuity am i right ? if was that i´ll try it

                  Comment


                    #10
                    Re: i can´t found +3.3v run

                    Originally posted by techtiger View Post
                    Make sure RTC_CELL is crossing R119 R405 and also +3.3V_EC U23 pin 26 75 , there’s no communication between SIO & BIOS chip that’s why the BM dead condition save the old dump and flash bios
                    Just check 3.3V RTC cell goes to U14E
                    Last edited by Techtiger; 12-05-2019, 02:58 PM.

                    Comment

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