asus k50ij dead

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  • koresi
    Member
    • Sep 2012
    • 24
    • Romania
    #1

    asus k50ij dead

    hello,
    i have an asus k50ij with no led lights and no charging;there is only +19V and 3,3v for EC also EC_reset but no VSUS_ON.
    I have checked the EC inputs everything seems to be ok...AC_IN_OC# is 3,3v...EC clock is 32 Khz..
    I would change the EC but i want to be sure that EC is defective...
    Any hint?
    Could be the bios chip?I am not sure that the EC needs bios to rise up the VSUS_ON signal.
    Waiting for your opinions...

    Best regards.
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    • sopik78
      Badcaps Veteran
      • Nov 2013
      • 517
      • Czech Republic
      #2
      Re: asus k50ij dead

      Try charger IC MB39A132 and related FETs

        Comment

        • Francisco.s
          Badcaps Veteran
          • Jan 2013
          • 691
          • Spain
          #3
          Re: asus k50ij dead

          Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
          If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
          (VSUS_ON--> VSUS_ON_PWR--> ENBL)
          This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
          Check and post results.

            Comment

            • whaldsz
              Badcaps Veteran
              • Apr 2013
              • 395
              • Philippines
              #4
              Re: asus k50ij dead

              Originally posted by koresi
              hello,
              i have an asus k50ij with no led lights and no charging;there is only +19V and 3,3v for EC also EC_reset but no VSUS_ON.
              I have checked the EC inputs everything seems to be ok...AC_IN_OC# is 3,3v...EC clock is 32 Khz..
              I would change the EC but i want to be sure that EC is defective...
              Any hint?
              Could be the bios chip?I am not sure that the EC needs bios to rise up the VSUS_ON signal.
              Waiting for your opinions...

              Best regards.
              Check if you get 3.3v at RSMRST#.

                Comment

                • koresi
                  Member
                  • Sep 2012
                  • 24
                  • Romania
                  #5
                  Re: asus k50ij dead

                  Originally posted by Francisco.s
                  Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
                  If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
                  (VSUS_ON--> VSUS_ON_PWR--> ENBL)
                  This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
                  Check and post results.
                  no,there is no voltage on pin 19 of IT8502.

                    Comment

                    • koresi
                      Member
                      • Sep 2012
                      • 24
                      • Romania
                      #6
                      Re: asus k50ij dead

                      Originally posted by whaldsz
                      Check if you get 3.3v at RSMRST#.
                      i did not checked the RSMRST# signal,but i think it becomes active after VSUS_ON and SUSPWRGOOD.
                      I will check and tell you.
                      thanks.

                        Comment

                        • desktop85
                          Member
                          • Jul 2013
                          • 14
                          • Venezuela
                          #7
                          Re: asus k50ij dead

                          Originally posted by Francisco.s
                          Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
                          If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
                          (VSUS_ON--> VSUS_ON_PWR--> ENBL)
                          This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
                          Check and post results.
                          I've the same board with the same problem, I solder the test pad JP81113 to power on the PWM U8101 ( RT8206AGQW ) but nothing happens, I've checked the power mosfets that the U8101 controls but are ok. Also I replace the PWM by other compatible ISL6236 but nothing.

                          I solder the test pad because I don't have the ENBL signal.

                            Comment

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