asus g750 not charging battery

[myth77]

First, there was a short in 19v line, it was shorting charger. I found capacitor PCE6000-poscap 15uf/25v was dead, replaced it, laptop starts, everything is fine but it will not charge battery.
I checked and i found mosfets pq8805 and pq8804 were shorted, i replaced them. No short on battery line now. But...battery is stil not charging... when there is no battery i have on bat_con arround 2.6 v (this is fine) but when i plug the battery i have 0.8v on bat_con (this is bed, should be arround 17v). AC_BAT_SYS is ok, its arround 19V. What am i missing?

Oh, one more thing i tried second battery and it is the same thing, and second, this i am not sure, but i believe first time i replaced mosfets, and while the laptop was dissasembled i was getting 17v on bat_con but later never again (although i am not 100% sure of this....)

attached boardview

[ktmmotocross]

Re: asus g750 not charging battery

change charging chip BQ

[myth77]

Re: asus g750 not charging battery

Update...i didnt change charging chip yet....first i tried to reset the bios and srtcrst and rtcrst..
After that something changed.... i have arround 11.9 volt on bat_con...then i tried the second battery, the readings were 12.9 volt relating ground...i even found third battery from local repair shop and the reading is 15.9 vol lol oh, and only one battery if i left it for couple of minutes is charging a little...after i unplug the charger the laptop will stay on for a couple of seconds on this battery, on two other batteries nothing, shuttdown immediately after i unplug the charger. In details:
1. First battery not charging, multimeter reading from 11.90 v, and continuously rising in a second for a 0.01 v, the reading looks like 11.91,11.92,11.93,11.94...it rises till 12.90 maybe even more, didnt check.
2. Second battery charging a bit, multimeter reading from 12.90 v and continuously rising in a second for a 0.01 v, the reading looks like 12.91,12.92,12.93,12.94...it rises till 13.90 maybe even more, didnt check.
3. Third battery not charging, multimeter readings are jumping it looks like 15.90,15.82,15.95,15.91,15.85,15.90...and in a circle...(maybe dead battery?)

So, charging chip still to blame? or something leaking on mosfets,or...? thank you

[questore]

Re: asus g750 not charging battery

When battery is charged try removing AC adapter then measure the voltage on bat_con if its too low then your laptop is turning off because of undervoltage battery problem. Measure the Ampere of the batteries after fully charged too.

[TechDBNA]

Re: asus g750 not charging battery

change charging chip BQ

What's the chip number on the above schematic?