Nm-c371 RTC problem

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  • ahmarzo
    Senior Member
    • Mar 2015
    • 168
    • india
    #1

    Nm-c371 RTC problem

    Have motherboard nm-c371 gives display without RTC and no power on with RTC battery attached .no shorting in RTC section vccrtc 3 v
    Pchrtcrst 3v
    Pchsrtcrst is 3v

    Plz help solving this problem
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada
      #2
      Re: Nm-c371 RTC problem

      Review the attached section of the logic board.

      Review the voltage to ground on the dual diodes - pins 1, 2 and 3.

      Attach with RTC battery; and also measure without RTC battery.
      Attached Files

        Comment

        • ahmarzo
          Senior Member
          • Mar 2015
          • 168
          • india
          #3
          Re: Nm-c371 RTC problem

          With RTC attached pin no 1 -3v. Pin no2 -3v and pin no 3 -0v
          When RTC is removed and powered on pin 1 and 3 - 3v and pin no 2 -0v

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: Nm-c371 RTC problem

              Originally posted by ahmarzo
              With RTC attached pin no 1 -3v. Pin no2 -3v and pin no 3 -0v
              When RTC is removed and powered on pin 1 and 3 - 3v and pin no 2 -0v
              Nothing wrong here. If boardview is available, then search "RTC" as keyword in schematic and measure each and every point of RTC circuit. Without boardview its herculian task though.

                Comment

                • Sephir0th
                  Badcaps Legend
                  • Oct 2020
                  • 1250
                  • Germany
                  #5
                  Re: Nm-c371 RTC problem

                  Please confirm, +3VL is missing with CMOS attached present, with CMOS removed? Do you have checked the diode in diode mode for sanity?
                  FairRepair on YouTube

                    Comment

                    • ahmarzo
                      Senior Member
                      • Mar 2015
                      • 168
                      • india
                      #6
                      Re: Nm-c371 RTC problem

                      Thanks everyone after changing pd101 the voltage is same on all pins but the problem has been solved.

                        Comment

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