Dell n5110 power problem

[menshawy]

hi all friends
dell n5110
mb : 10260-1
dq15 dis nvida
the mb problem is don't power on when the rtc battery is placed
and if it is removed the mb don't power on automatically
but when i press the power button the mb on and display ok
in standby mod (s5)
3D3V_S5 volt is missing
pl4101 0v
pl4102 0v
i cant find short in the 3D3V_S5 line
i was replaced pu4103 (tps51123) and pr4110 and pch hm67 but with no luck
what can i do more
help please

thanks

[mcplslg123]

Re: Dell n5110 power problem

Check Q6001 & Q6002 for RTC issue. 3D3V_S5 is generated by TPS51123-may be not properly soldered or the ic itself is bad. Why you replaced PCh??

[menshawy]

Re: Dell n5110 power problem

Check Q6001 & Q6002 for RTC issue. 3D3V_S5 is generated by TPS51123-may be not properly soldered or the ic itself is bad. Why you replaced PCh??

thanks for replay
i was replaced tps51123 and q6002
3D3V_S5 is generated after press power button
i was replaced PCh because when i injected 3.3v in +side for c6001 the pch has a few overheating
thanks

[mcplslg123]

Re: Dell n5110 power problem

You didnt mentioned voltage on all pins of Q6001/6002-with cmos battery/without cmos battery.

[menshawy]

Re: Dell n5110 power problem

without cmos battery
q6001
pin1 0v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 0v
pin3 0v
with cmos battery
pin1 3v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 3.06
pin3 0v

[digitalpc]

Re: Dell n5110 power problem

without cmos battery
q6001
pin1 0v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 0v
pin3 0v
with cmos battery
pin1 3v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 3.06
pin3 0v

do u check the diodes page 60

[mcplslg123]

Re: Dell n5110 power problem

without cmos battery
q6001
pin1 0v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 0v
pin3 0v
with cmos battery
pin1 3v
pin2 3.27v
pin3 3.13v
q6002
pin1 gnd
pin2 3.06
pin3 0v

measurements are correct.