Nm-c371 RTC problem

[ahmarzo]

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

[mon2]

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.

[ahmarzo]

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

[mcplslg123]

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

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.

[Sephir0th]

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?

[ahmarzo]

Re: Nm-c371 RTC problem

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