Lenovo G770 won't work on battery

[invisible4u4ever]

Hi guys...

I need help again...

I have one Lenovo G770 charging battery(pluged in, charging) and working on charger perfect... but when I disconnect charger laptop power off.... I looking on mainboard but I don't know where to start in finding problem... I guess some of mosfets dont switch on battery source...
In attachment is mainboard schema...

Please can anyone help me to find problem

[Djosla]

Re: Lenovo G770 won't work on battery

kb930 or kb9012 on that board ?

[Dumah Brazorf]

Re: Lenovo G770 won't work on battery

Page 45. Check PD101 and PQ101.

[invisible4u4ever]

Re: Lenovo G770 won't work on battery

Djosla - KB930QF

Dumah Brazorf - PD101 on one pin 18.8v on second 12v (when charger is plugged in)
I check PQ101 when charger is plugged in I got pin1-18.8v pin2-18.8v and pin3-3v

no voltage when charger is out

[Djosla]

Re: Lenovo G770 won't work on battery

Ok no smbus enabled charging...good thing..

check this and post results (page 47):
1. resistance between pins 21 and 22 of PU301
2. resistance between pl301 and ground.
---than in active mode(put charger):
3. voltage on all pins of pq303 and pq306 and pq310

also did you check with good known battery ?

[invisible4u4ever]

Re: Lenovo G770 won't work on battery

PU301 between 21 22 pin - 40ohm

PL301 and ground 552 ohm

PQ303 pins 1234 - 18.8v pins 5678 0.49v
PQ306 pin1 - 18.8v pins 2,3 -0v
PQ309 pin3 - 3v pins 1,2 - 0v

[invisible4u4ever]

Re: Lenovo G770 won't work on battery

ooooo now i found new battery and when charger is pluged in ... power on... unplug charger and laptop works on battery.... but when charger is unplagged and i try to power it nothing happend... on

[invisible4u4ever]

Re: Lenovo G770 won't work on battery

somebody know where is problem?